Eastern Bankshares (EBC) 10-Q3 Nov 232023 Q3 Quarterly reportFinancial data

Company Profile

Cover Page

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-39610
Entity Registrant Name	Eastern Bankshares, Inc.
Entity Incorporation, State or Country Code	MA
Entity Tax Identification Number	84-4199750
Entity Address, Address Line One	265 Franklin Street
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02110
City Area Code	800
Local Phone Number	327-8376
Title of 12(b) Security	Common Stock
Trading Symbol	EBC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		176,426,993
Amendment Flag	false
Entity Central Index Key	0001810546
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3

UNAUDITED CONSOLIDATED BALANCE

UNAUDITED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
ASSETS
Cash and due from banks	$ 72,689	$ 106,040
Short-term investments	536,119	63,465
Cash and cash equivalents	608,808	169,505
Available for sale (amortized cost $5,257,264 and $7,825,435, respectively)	4,261,518	6,690,778
Held to maturity (fair value $387,654 and $423,226, respectively)	455,900	476,647
Total securities	4,717,418	7,167,425
Loans held for sale	23,892	4,543
Loans:
Total loans	13,919,275	13,575,531
Allowance for loan losses	(155,146)	(142,211)
Unamortized premiums, net of unearned discounts and deferred fees	(19,307)	(13,003)
Net loans	13,744,822	13,420,317
Federal Home Loan Bank stock, at cost	37,125	41,363
Premises and equipment	59,033	62,493
Bank-owned life insurance	163,700	160,790
Goodwill and other intangibles, net	566,709	568,009
Deferred income taxes, net	416,081	331,963
Prepaid expenses	156,113	165,368
Other assets	527,873	426,863
Assets of discontinued operations	124,718	128,219
Total assets	21,146,292	22,646,858
Deposits:
Demand	5,177,015	6,240,637
Interest checking accounts	3,671,871	4,568,122
Savings accounts	1,393,545	1,831,123
Money market investment	4,709,149	4,710,095
Certificates of deposit	2,472,589	1,624,382
Total deposits	17,424,169	18,974,359
Borrowed funds:
Short-term Federal Home Loan Bank advances	656,336	691,297
Escrow deposits of borrowers	24,947	22,314
Interest rate swap collateral funds	16,900	14,430
Long-term Federal Home Loan Bank advances	17,189	12,787
Total borrowed funds	715,372	740,828
Other liabilities	525,378	424,951
Liabilities of discontinued operations	34,820	34,930
Total liabilities	18,699,739	20,175,068
Commitments and contingencies (see Note 13)
Shareholders’ equity
Common shares, $0.01 par value, 1,000,000,000 shares authorized, 176,376,675 and 176,172,073 shares issued and outstanding at September 30, 2023 and December 31, 2022, respectively	1,766	1,762
Additional paid in capital	1,661,136	1,649,141
Unallocated common shares held by the Employee Stock Ownership Plan	(133,992)	(137,696)
Retained earnings	1,747,225	1,881,775
Accumulated other comprehensive income, net of tax	(829,582)	(923,192)
Total shareholders’ equity	2,446,553	2,471,790
Total liabilities and shareholders’ equity	21,146,292	22,646,858
Commercial and industrial \| Commercial Portfolio Segment
ASSETS
Loans held for sale	22,213	0
Loans:
Total loans	3,087,509	3,150,946
Allowance for loan losses	(26,518)	(26,859)
Commercial real estate \| Commercial Portfolio Segment
Loans:
Total loans	5,396,912	5,155,323
Allowance for loan losses	(70,623)	(54,730)
Commercial construction \| Commercial Portfolio Segment
Loans:
Total loans	382,615	336,276
Allowance for loan losses	(7,799)	(7,085)
Business banking \| Commercial Portfolio Segment
Loans:
Total loans	1,087,799	1,090,492
Allowance for loan losses	(15,218)	(16,189)
Residential real estate \| Residential Real Estate
ASSETS
Loans held for sale	1,679	4,543
Loans:
Total loans	2,550,861	2,460,849
Allowance for loan losses	(26,355)	(28,129)
Consumer home equity \| Consumer Portfolio Segment
Loans:
Total loans	1,193,859	1,187,547
Allowance for loan losses	(5,482)	(6,454)
Other consumer \| Consumer Portfolio Segment
Loans:
Total loans	$ 219,720	$ 194,098

UNAUDITED CONSOLIDATED BALANC_2

UNAUDITED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale debt securities, amortized cost	$ 5,257,264	$ 7,825,435
Held-to-maturity debt securities, fair value	$ 387,654	$ 423,226
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock issued (in shares)	176,376,675	176,172,073
Common stock outstanding (in shares)	176,376,675	176,172,073

UNAUDITED CONSOLIDATED STATEMEN

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest and dividend income:
Interest and fees on loans	$ 169,274	$ 124,992	$ 483,676	$ 333,595
Taxable interest and dividends on securities	24,191	29,280	77,451	88,277
Non-taxable interest and dividends on securities	1,434	1,917	4,302	5,585
Interest on federal funds sold and other short-term investments	7,269	1,638	27,384	2,726
Total interest and dividend income	202,168	157,827	592,813	430,183
Interest expense:
Interest on deposits	59,607	4,781	158,686	11,164
Interest on borrowings	5,356	867	17,025	959
Total interest expense	64,963	5,648	175,711	12,123
Net interest income	137,205	152,179	417,102	418,060
Provision for allowance for loan losses	7,328	6,480	14,854	7,045
Net interest income after provision for allowance for loan losses	129,877	145,699	402,248	411,015
Noninterest income (loss):
Service charges on deposit accounts	7,403	6,708	21,117	23,558
Trust and investment advisory fees	6,235	5,832	18,136	17,967
Debit card processing fees	3,388	3,249	10,071	9,417
Interest rate swap income	1,695	1,562	2,112	6,087
(Losses) income from investments held in rabbi trusts	(1,523)	(2,248)	4,336	(13,997)
Realized loss on sales of commercial loans	(2,651)	0	(2,651)	0
(Losses) gains on sales of mortgage loans held for sale, net	(164)	22	(288)	240
Losses on sales of securities available for sale, net	0	(198)	(333,170)	(2,474)
Other	4,774	4,597	15,845	13,527
Total noninterest income (loss)	19,157	19,524	(264,492)	54,325
Noninterest expense:
Salaries and employee benefits	60,898	61,292	185,264	171,525
Office occupancy and equipment	8,641	8,880	26,797	28,804
Data processing	13,443	12,242	38,555	39,711
Professional services	7,125	4,218	13,277	11,510
Marketing expenses	1,765	2,118	4,899	6,262
Loan expenses	1,082	2,211	3,292	5,757
FDIC insurance	2,808	1,578	8,388	4,710
Amortization of intangible assets	504	299	1,299	899
Other	5,482	2,927	15,802	6,888
Total noninterest expense	101,748	95,765	297,573	276,066
Income (loss) from continuing operations before income tax expense (benefit)	47,286	69,458	(159,817)	189,274
Income tax (benefit) expense	(16,178)	16,650	(65,619)	43,681
Net income (loss) from continuing operations	63,464	52,808	(94,198)	145,593
Net (loss) income from discontinued operations	(4,351)	1,969	7,872	11,872
Net income (loss)	$ 59,113	$ 54,777	$ (86,326)	$ 157,465
Basic earnings (loss) per share:
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ 0.39	$ 0.32	$ (0.58)	$ 0.87
Basic (loss) earnings per share from discontinued operations (in dollars per share)	(0.03)	0.01	0.05	0.07
Basic earnings (loss) per share (in dollars per share)	0.36	0.33	(0.53)	0.94
Diluted earnings (loss) per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)	0.39	0.32	(0.58)	0.87
Diluted (loss) earnings per share from discontinued operations (in dollars per share)	(0.03)	0.01	0.05	0.07
Diluted earnings per share (in dollars per share)	$ 0.36	$ 0.33	$ (0.53)	$ 0.94

UNAUDITED CONSOLIDATED STATEM_2

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 59,113	$ 54,777	$ (86,326)	$ 157,465
Other comprehensive (loss) income, net of tax:
Net change in fair value of securities available for sale	(117,260)	(261,469)	116,285	(860,269)
Net change in fair value of cash flow hedges	(10,980)	(56,062)	(21,573)	(61,482)
Net change in other comprehensive income for defined benefit postretirement plans	(360)	(124)	(1,102)	(371)
Total other comprehensive (loss) income	(128,600)	(317,655)	93,610	(922,122)
Total comprehensive (loss) income	$ (69,487)	$ (262,878)	$ 7,284	$ (764,657)

UNAUDITED CONSOLIDATED STATEM_3

UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands		Total	Cumulative effect accounting adjustment		Common Stock	Additional Paid in Capital	Retained Earnings	Retained Earnings Cumulative effect accounting adjustment		Accumulated Other Comprehensive Loss	Unallocated Common Stock Held by ESOP
Beginning balance (in shares) at Dec. 31, 2021					186,305,332
Beginning Balance at Dec. 31, 2021		$ 3,406,352	$ (20,098)	[1]	$ 1,863	$ 1,835,241	$ 1,768,653	$ (20,098)	[1]	$ (56,696)	$ (142,709)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common shareholders		$ (50,263)					(50,263)
Repurchased common stock (in shares)		(8,564,338)			(8,564,338)
Repurchased common stock		$ (170,771)			$ (86)	(170,685)
Issuance of restricted stock awards (in shares)					31,559
Issuance of restricted stock awards		0			$ 1	(1)
Share-based compensation		8,092				8,092
Net income (loss)		157,465					157,465
Other comprehensive income (loss), net of tax		(922,122)								(922,122)
ESOP shares committed to be released		7,508				3,749					3,759
Ending balance (in shares) at Sep. 30, 2022					177,772,553
Ending balance at Sep. 30, 2022		2,416,163			$ 1,778	1,676,396	1,855,757			(978,818)	(138,950)
Beginning balance (in shares) at Dec. 31, 2021					186,305,332
Beginning Balance at Dec. 31, 2021		$ 3,406,352	(20,098)	[1]	$ 1,863	1,835,241	1,768,653	(20,098)	[1]	(56,696)	(142,709)
Ending balance (in shares) at Dec. 31, 2022		176,172,073			176,172,073
Ending balance at Dec. 31, 2022		$ 2,471,790	822	[2]	$ 1,762	1,649,141	1,881,775	822	[2]	(923,192)	(137,696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	[2]	Accounting Standards Update 2022-02
Beginning balance (in shares) at Jun. 30, 2022					179,253,801
Beginning Balance at Jun. 30, 2022		$ 2,718,396			$ 1,793	1,700,495	1,817,474			(661,163)	(140,203)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common shareholders		$ (16,494)					(16,494)
Repurchased common stock (in shares)		(1,481,248)			(1,481,248)
Repurchased common stock		$ (28,950)			$ (15)	(28,935)
Share-based compensation		3,561				3,561
Net income (loss)		54,777					54,777
Other comprehensive income (loss), net of tax		(317,655)								(317,655)
ESOP shares committed to be released		2,528				1,275					1,253
Ending balance (in shares) at Sep. 30, 2022					177,772,553
Ending balance at Sep. 30, 2022		$ 2,416,163			$ 1,778	1,676,396	1,855,757			(978,818)	(138,950)
Beginning balance (in shares) at Dec. 31, 2022		176,172,073			176,172,073
Beginning Balance at Dec. 31, 2022		$ 2,471,790	$ 822	[2]	$ 1,762	1,649,141	1,881,775	$ 822	[2]	(923,192)	(137,696)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common shareholders		$ (49,046)					(49,046)
Repurchased common stock (in shares)		0
Issuance of restricted stock awards (in shares)					47,820
Issuance of restricted stock awards		$ 0			$ 1	(1)
Issuance of common stock under share-based compensation arrangements (in shares)	[3]				156,782
Issuance of common stock under share-based compensation arrangements	[3]	(1,164)			$ 3	(1,167)
Share-based compensation		11,387				11,387
Net income (loss)		(86,326)					(86,326)
Other comprehensive income (loss), net of tax		93,610								93,610
ESOP shares committed to be released		$ 5,480				1,776					3,704
Ending balance (in shares) at Sep. 30, 2023		176,376,675			176,376,675
Ending balance at Sep. 30, 2023		$ 2,446,553			$ 1,766	1,661,136	1,747,225			(829,582)	(133,992)
Beginning balance (in shares) at Jun. 30, 2023					176,376,675
Beginning Balance at Jun. 30, 2023		2,526,772			$ 1,766	1,656,750	1,704,470			(700,982)	(135,232)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends to common shareholders		(16,358)					(16,358)
Share-based compensation		3,675				3,675
Net income (loss)		59,113					59,113
Other comprehensive income (loss), net of tax		(128,600)								(128,600)
ESOP shares committed to be released		$ 1,951				711					1,240
Ending balance (in shares) at Sep. 30, 2023		176,376,675			176,376,675
Ending balance at Sep. 30, 2023		$ 2,446,553			$ 1,766	$ 1,661,136	$ 1,747,225			$ (829,582)	$ (133,992)

[1] Represents gross transition adjustment amount of $28.0 million, net of taxes of $7.9 million, to reflect the cumulative impact on retained earnings pursuant to the Company’s adoption of Accounting Standards Update 2016-13. Refer to Note 4, “Loans and Allowance for Credit Losses” within the Notes to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Quarterly Report on Form 10-Q for additional discussion. Represents gross transition adjustment amount of $1.1 million, net of taxes of $0.3 million, to reflect the cumulative impact on retained earnings pursuant to the Company’s adoption of Accounting Standards Update 2022-02. Refer to Note 4, “Loans and Allowance for Credit Losses” within the Notes to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Quarterly Report on Form 10-Q for additional discussion. Represents shares issued, net of employee tax withheld, during the nine months ended September 30, 2023 upon the vesting of restricted stock units. Refer to Note 11, “Share-Based Compensation” within the Notes to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Quarterly Report on Form 10-Q for additional discussion.

UNAUDITED CONSOLIDATED STATEM_4

UNAUDITED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (Parenthetical) - USD ($) $ in Thousands	Jan. 01, 2023	Jan. 01, 2022
Cumulative effect accounting adjustment
Retained earnings	$ 1,100	$ 28,000
Deferred income tax (benefit) expense	$ 300	$ 7,900

UNAUDITED CONSOLIDATED STATEM_5

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net (loss) income from continuing operations		$ (94,198)	$ 145,593
Net income from discontinued operations		7,872	11,872
Net income (loss)		(86,326)	157,465
Adjustments to reconcile net income to net cash provided by operating activities
Provision for allowance for loan losses		14,854	7,045
Depreciation and amortization		9,041	8,923
Impairment of right-of-use assets		395	604
Amortization (accretion) of deferred loan fees and premiums, net		4,394	(3,499)
Deferred income tax (benefit) expense		(96,622)	12,096
Amortization of investment security premiums and discounts, net		5,123	15,251
Right-of-use asset amortization		8,191	8,634
Share-based compensation		11,387	8,092
Increase in cash surrender value of bank-owned life insurance		(2,910)	(2,747)
Loss on sale of securities available for sale, net		333,170	2,474
Net gain on bank premises and equipment		0	(1,423)
Accretion of gains from terminated interest rate swaps		(46)	(9,653)
Employee Stock Ownership Plan expense		5,480	7,508
Realized loss on sales of commercial loans	[1]	2,505	0
Other		138	662
Change in:
Loans held for sale		2,881	245
Prepaid pension expense		3,607	(8,599)
Other assets		(2,197)	73,400
Other liabilities		(8,532)	(60,025)
Net cash provided by operating activities - continuing operations		196,661	204,581
Net cash provided by operating activities - discontinued operations		12,271	21,923
Net cash provided by operating activities		208,932	226,504
Investing activities
Proceeds from sales of securities available for sale		1,899,724	400,543
Proceeds from maturities and principal paydowns of securities available for sale		329,795	880,145
Purchases of securities available for sale		0	(740,770)
Proceeds from maturities and principal paydowns of securities held to maturity		21,106	11,968
Purchases of securities held to maturity		0	(493,678)
Proceeds from sale of Federal Home Loan Bank stock		239,565	16,214
Purchases of Federal Home Loan Bank stock		(235,327)	(24,024)
Contributions to low income housing tax credit investments		(26,916)	(14,967)
Contributions to other equity investments		(720)	(450)
Distributions from other equity investments		253	762
Net increase in outstanding loans, excluding loan purchases		(524,790)	(546,296)
Proceeds from sales of commercial loans		189,296	0
Purchases of loans		(31,980)	(79,880)
Proceeds from life insurance policies		0	20,446
Purchased banking premises and equipment		(4,290)	(6,381)
Proceeds from sale of premises held for sale		0	17,313
Net cash provided by (used in) investing activities - continuing operations		1,855,716	(559,055)
Net cash used in investing activities - discontinued operations		(47)	(13,400)
Net cash provided by (used in) investing activities		1,855,669	(572,455)
Financing activities
Net decrease in demand, savings, interest checking, and money market investment deposit accounts		(2,398,397)	(725,125)
Net increase (decrease) in time deposits		848,207	(169,805)
Net (decrease) increase in borrowed funds		(25,456)	388,440
Payments for repurchases of common stock		0	(170,771)
Dividends declared and paid to common shareholders		(48,691)	(49,759)
Net cash used in financing activities - continuing operations		(1,624,337)	(727,020)
Net cash used in financing activities - discontinued operations		(961)	(384)
Net cash used in financing activities		(1,625,298)	(727,404)
Net increase (decrease) in cash, cash equivalents, and restricted cash		439,303	(1,073,355)
Cash, cash equivalents, and restricted cash at beginning of period		169,505	1,231,792
Cash, cash equivalents, and restricted cash at end of period		608,808	158,437
Cash paid during the period for:
Interest paid on deposits and borrowings		165,700	12,036
Income taxes		23,637	24,540
Non-cash activities
Net increase in capital commitments relating to low income housing tax credit projects		102,001	30,378
Net decrease in operating lease right-of-use assets and operating lease liabilities relating to lease remeasurements/modifications		$ 4,890	$ 14,082

[1]Excludes the mark-to-market adjustment related to one commercial and industrial loan transferred to held for sale during the nine months ended September 30, 2023 which is included in the change in loans held for sale.

Corporate Structure and Nature

Corporate Structure and Nature of Operations; Basis of Presentation	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Corporate Structure and Nature of Operations; Basis of Presentation	Corporate Structure and Nature of Operations; Basis of Presentation Corporate Structure and Nature of Operations Eastern Bankshares, Inc., a Massachusetts corporation (the “Company”), is a bank holding company. Through its wholly-owned subsidiaries, Eastern Bank (the “Bank”) and Eastern Insurance Group LLC (“Eastern Insurance Group”), the Company provides a variety of banking services, trust and investment services, and insurance services through its full-service bank branches and insurance offices, located primarily in eastern Massachusetts, southern and coastal New Hampshire and Rhode Island. On September 19, 2023, the Company and the Bank entered into an asset purchase agreement in which Arthur J. Gallagher & Co. (“Gallagher”) agreed to purchase substantially all of Eastern Insurance Group’s assets for cash consideration and to assume certain liabilities. On October 31, 2023, the Company completed its sale of its insurance agency business to Gallagher. Refer to Note 19, “Discontinued Operations” and Note 20, “Subsequent Events” for further discussion regarding the sale of the insurance agency business. The activities of the Company are subject to the regulatory supervision of the Board of Governors of the Federal Reserve System (“Federal Reserve”). The activities of the Bank are subject to the regulatory supervision of the Massachusetts Commissioner of Banks, the Federal Deposit Insurance Corporation (“FDIC”) and the Consumer Financial Protection Bureau. The Company and the activities of the Bank and its subsidiaries are also subject to various Massachusetts, New Hampshire and Rhode Island business and banking regulations and, with regard to Eastern Insurance Group, applicable insurance regulations. Basis of Presentation The Company’s Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”) as set forth by the Financial Accounting Standards Board (“FASB”) and its Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) as well as the rules and interpretive releases of the U.S. Securities and Exchange Commission (“SEC”) under the authority of federal securities laws. The Consolidated Financial Statements include the accounts of the Company, its wholly-owned subsidiaries and entities in which it holds a controlling financial interest through being the primary beneficiary or through holding a majority of the voting interest. All intercompany accounts and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current period’s presentation which included certain loan servicing-related costs which have been reclassified from professional services to loan expense. In addition, as a result of the decision to sell substantially all of the assets and transfer substantially all of the liabilities of Eastern Insurance Group, the Company reclassified certain amounts previously reported including: • certain assets and liabilities previously reported in the insurance agency business were reclassified to assets and liabilities of discontinued operations, respectively, on the Consolidated Balance Sheets; • certain components of noninterest income and noninterest expense previously reported in the insurance agency business were reclassified to net income from discontinued operations on the Consolidated Statements of Income; and • certain operating, investing, and financing cash flows previously reported on their applicable lines within the Consolidated Statements of Cash Flows were reclassified to cash flows used in/provided by operating activities of, investment activities of and financing activities of discontinued operations, respectively. The accompanying Consolidated Balance Sheet as of September 30, 2023, the Consolidated Statements of Income and Comprehensive Income and of Changes in Shareholders’ Equity for the three and nine months ended September 30, 2023 and 2022 and Statements of Cash Flows for the nine months ended September 30, 2023 and 2022 are unaudited. The Consolidated Balance Sheet as of December 31, 2022 was derived from the Audited Consolidated Financial Statements as of that date. The interim Consolidated Financial Statements and the accompanying notes should be read in conjunction with the annual Consolidated Financial Statements and the accompanying notes contained within the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (“2022 Form 10-K”), as filed with the SEC. In the opinion of management, the Company’s Consolidated Financial Statements reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented. The results for the three and nine months ended September 30, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
Summary of Significant Accounting Policies	Sep. 30, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The following describes the Company’s use of estimates as well as relevant accounting pronouncements that were recently issued but not yet adopted as of September 30, 2023 and those that were adopted during the nine months ended September 30, 2023. For a full discussion of significant accounting policies, refer to the Notes to the Consolidated Financial Statements included within the Company’s 2022 Form 10-K. Use of Estimates In preparing the Consolidated Financial Statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and income and expenses for the periods reported. Actual results could differ from those estimates based on changing conditions, including economic conditions and future events. Material estimates that are particularly susceptible to change relate to the determination of the allowance for credit losses, valuation and fair value measurements, the liabilities for benefit obligations (particularly pensions), the provision for income taxes and impairment of goodwill and other intangibles. Recent Accounting Pronouncements Relevant standards that were recently issued but not yet adopted as of September 30, 2023: In March 2023, the FASB issued ASU 2023-02, Investments–Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (“ASU 2023-02”). This update permits reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if the following conditions are met: 1. It is probable that the income tax credits allocable to the tax equity investor will be available. 2. The tax equity investor does not have the ability to exercise significant influence over the operating and financial policies of the underlying project. 3. Substantially all of the projected benefits are from income tax credits and other income tax benefits. Projected benefits include income tax credits, other income tax benefits, and other non-income-tax-related benefits. The projected benefits are determined on a discounted basis, using a discount rate that is consistent with the cash flow assumptions used by the tax equity investor in making its decision to invest in the project. 4. The tax equity investor’s projected yield based solely on the cash flows from the income tax credits and other income tax benefits is positive. 5. The tax equity investor is a limited liability investor in the limited liability entity for both legal and tax purposes, and the tax equity investor’s liability is limited to its capital investment. Under existing accounting standards, the proportional amortization method is allowable only for equity investments in low-income-housing tax credit structures. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). Updates made by ASU 2023-02 allow a reporting entity to make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis. The Company had previously made an accounting policy election to account for its investments in low-income-housing tax credit investments using the proportional amortization method. This election was made upon the Company’s adoption of ASU 2014-01, Investments–Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects , which introduced the option to apply proportional amortization to low-income-housing tax credit investments . For public business entities, the amendments in ASU 2023-02 are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in an interim period. The Company expects the adoption of this standard will not have a material impact on its Consolidated Financial Statements. In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements–Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative (“ASU 2023-06”) . The amendments in this update modify the disclosure or presentation requirements for a variety of topics in the codification. Certain amendments represent clarifications to or technical corrections of the current requirements. The following is a summary of the topics included in the update and which pertain to the Company: 1. Statement of cash flows (Topic 230): Requires an accounting policy disclosure in annual periods of where cash flows associated with derivative instruments and their related gains and loses are presented in the statement of cash flows; 2. Accounting changes and error corrections (Topic 250): Requires that when there has been a change in the reporting entity, the entity disclose any material prior-period adjustment and the effect of the adjustment on retained earnings in interim financial statements; 3. Earnings per share (Topic 260): Requires disclosure of the methods used in the diluted earnings-per-share computation for each dilutive security and clarifies that certain disclosures should be made during interim periods, and amends illustrative guidance to illustrate disclosure of the methods used in the diluted earnings per share computation; 4. Commitments (Topic 440): Requires disclosure of assets mortgaged, pledged, or otherwise subject to lien and the obligations collateralized; and 5. Debt (Topic 470): Requires disclosure of amounts and terms of unused lines of credit and unfunded commitments and the weighted-average interest rate on outstanding short-term borrowings. For public business entities, the amendments in ASU 2023-06 are effective on the date which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. If by June 30, 2027, the SEC has not removed the applicable requirement from Regulation and S-X or Regulation S-K, the pending content of the related amendment will be removed from the codification and will not become effective for any entity. Early adoption is not permitted and the amendments are required to be applied on a prospective basis. The Company expects the adoption of this standard will not have a material impact on its Consolidated Financial Statements. Relevant standards that were adopted during the nine months ended September 30, 2023: In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”). This update modifies how an acquiring entity measures contract assets and contract liabilities of an acquiree in a business combination in accordance with Topic 606. The amendments in this update require the acquiring entity in a business combination to account for revenue contracts as if they had originated the contract and assess how the acquiree accounted for the contract under Topic 606. ASU 2021-08 improves comparability of recognition and measurement of revenue contracts with customers both before and after a business combination. For public business entities, the amendments in this update were effective for fiscal years beginning after December 15, 2022. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2023. The amendments in this update should be applied prospectively to business combinations occurring on or after the effective date of the amendments with early adoption permitted. The adoption of this standard on January 1, 2023 did not have a material impact on the Company’s Consolidated Financial Statements. In March 2022, the FASB issued ASU 2022-02, Financial Instruments–Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”). The amendments in this update eliminate the accounting guidance on troubled debt restructurings (“TDRs”) for creditors in ASC 310-40 and amends the guidance on vintage disclosures, referenced in ASC 326-20-50, to require disclosure of current-period gross write-offs by year of origination. This update supersedes the existing accounting guidance for TDRs in ASC 310-40 in its entirety and requires entities to evaluate all receivable modifications under existing accounting guidance in ASC 310-20 to determine whether a modification made to a borrower results in a new loan or a continuation of an existing loan. In addition to the elimination of TDR accounting guidance, entities that adopt this update will no longer consider renewals, modifications and extensions that result from reasonably expected TDRs in their calculation of the allowance for credit losses. Further, if an entity employs a discounted cash flow method to calculate the allowance for credit losses, it will be required to use a post-modification-derived effective interest rate as part of its calculation. This update also requires new disclosures for receivables for which there has been a modification in their contractual cash flows resulting from borrowers experiencing financial difficulties. For public business entities, the amendments in this update were effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Entities may elect to apply the updated guidance on TDR recognition and measurement by using a modified retrospective transition method. The amendments on TDR disclosures and vintage disclosures should be adopted prospectively. On January 1, 2023, the Company adopted this standard by using the modified retrospective transition method, except with regard to amendments on TDR and vintage disclosures which were adopted prospectively. Accordingly, the Company recorded a cumulative-effect adjustment to retained earnings as of January 1, 2023. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements. Significant Accounting Policies The adoption of ASU 2022-02 resulted in changes in the Company’s accounting policies and estimates as it relates to loans receivable and the allowance for loan losses. The following describes the changes to the Company’s significant accounting policies from December 31, 2022, that resulted from the adoption of ASU 2022-02: Allowance for Loan Losses - Loans Held for Investment Modifications of Loans to Borrowers Experiencing Financial Difficulty The amendments in ASU 2022-02 eliminated the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors , while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Thus, as a result of adoption of this standard on January 1, 2023, rather than applying the recognition and measurement guidance for TDRs, the Company now applies the loan refinancing and restructuring guidance codified in paragraphs 310-20-35-9 through 35-11 of the Accounting Standards Codification to determine whether a modification results in a new loan or a continuation of an existing loan. Modifications to borrowers experiencing financial difficulty include principal forgiveness, interest rate reductions, term extensions, other-than-insignificant payment delays and combinations thereof. Expected losses or recoveries related to loans where modifications have been granted to borrowers experiencing financial difficulty have been included in the Company’s determination of the allowance for loan losses. Upon adoption of ASU 2022-02, the Company is no longer required to use a discounted cash flow method to measure the allowance for loan losses resulting from a modification to a borrower experiencing financial difficulty. Accordingly, the Company now applies the same credit methodology it uses for similar loans that were not modified. As previously indicated, the Company adopted ASU 2022-02 using the modified retrospective transition method. Accordingly, upon adoption, commercial loan TDRs existing at that time which were measured using a discounted cash flow methodology and all residential real estate and consumer home equity loan TDRs were transitioned to the applicable segment of loans collectively evaluated for impairment based upon their risk characteristics. Commercial loan TDRs determined to be collateral dependent continue to be assessed for impairment on an individual basis. Prior to the Company’s adoption of ASU 2022-02, in cases where a borrower was experiencing financial difficulties and the Company made certain concessionary modifications to contractual terms, the loan was classified as a TDR. Modifications included adjustments to interest rates, extensions of maturity, consumer loans where the borrower’s obligations had been effectively discharged through Chapter 7 bankruptcy and the borrower had not reaffirmed the debt to the Company, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. Management identified loans as TDR loans when it had a reasonable expectation that it would execute a TDR modification with a borrower. In addition, management estimated expected credit losses on a collective basis if a group of TDR loans shared similar risk characteristics. If a TDR loan’s risk characteristics were not similar to those of any of the Company’s other TDR loans, expected credit losses on the TDR loan were measured individually. The impairment analysis discounted the present value of the anticipated cash flows by the loan’s contractual rate of interest in effect prior to the loan’s modification or the fair value of collateral if the loan was collateral dependent. The amount of credit loss, if any, was recorded as a specific loss allocation to each individual loan or as a loss allocation to the pool of loans, for those loans for which credit loss was measured on a collective basis, in the allowance for credit losses. Any commercial (commercial and industrial, commercial real estate, commercial construction, and business banking loans) or residential loan that had been classified as a TDR and which subsequently defaulted was reviewed to determine if the loan should be deemed collateral-dependent. In such an instance, any shortfall between the value of the collateral and the book value of the loan was determined by measuring the recorded investment in the loan against the fair value of the collateral less costs to sell. Refer to Note 4, “Loans and Allowance for Credit Losses” for additional information regarding the Company’s measurement of the allowance for loan losses as of September 30, 2023 and information regarding the Company’s TDR loans as of December 31, 2022 and for the three and nine months ended September 30, 2022.

Securities

Securities	9 Months Ended
Securities	Sep. 30, 2023
Debt Securities [Abstract]
Securities	SecuritiesAvailable for Sale Securities The amortized cost, gross unrealized gains and losses, allowance for credit losses (“ACL”) and fair value of available for sale (“AFS”) securities as of the dates indicated were as follows: As of September 30, 2023 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 3,380,463 $ — $ (679,833) $ — $ 2,700,630 Government-sponsored commercial mortgage-backed securities 1,343,187 — (254,067) — 1,089,120 U.S. Agency bonds 236,149 — (28,184) — 207,965 U.S. Treasury securities 99,494 — (6,275) — 93,219 State and municipal bonds and obligations 197,971 — (27,387) — 170,584 $ 5,257,264 $ — $ (995,746) $ — $ 4,261,518 As of December 31, 2022 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 4,855,763 $ — $ (743,855) $ — $ 4,111,908 Government-sponsored commercial mortgage-backed securities 1,570,119 — (221,165) — 1,348,954 U.S. Agency bonds 1,100,891 — (148,409) — 952,482 U.S. Treasury securities 99,324 — (6,267) — 93,057 State and municipal bonds and obligations 198,039 9 (14,956) — 183,092 Other debt securities 1,299 — (14) — 1,285 $ 7,825,435 $ 9 $ (1,134,666) $ — $ 6,690,778 The Company did not record a provision for credit losses on any AFS securities for either the three and nine months ended September 30, 2023 or 2022. Accrued interest receivable on AFS securities totaled $9.7 million and $12.9 million as of September 30, 2023 and December 31, 2022, respectively, and is included within other assets on the Consolidated Balance Sheets. The Company did not record any write-offs of accrued interest receivable on AFS securities during either the three and nine months ended September 30, 2023 or 2022. No securities held by the Company were delinquent on contractual payments as of September 30, 2023 or December 31, 2022, nor were any securities placed on non-accrual status during the nine and twelve month periods then ended. The following table summarizes gross realized gains and losses from sales of AFS securities for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Gross realized gains from sales of AFS securities $ — $ 725 $ — $ 1,770 Gross realized losses from sales of AFS securities — (923) (333,170) (4,244) Net (losses) gains from sales of AFS securities $ — $ (198) $ (333,170) $ (2,474) Information pertaining to AFS securities with gross unrealized losses as of September 30, 2023 and December 31, 2022, for which the Company did not recognize a provision for credit losses under the current expected credit loss methodology (“CECL”), aggregated by investment category and length of time that individual securities had been in a continuous loss position, is as follows: As of September 30, 2023 Less than 12 Months 12 Months or Longer Total # of Gross Fair Gross Fair Gross Fair (Dollars in thousands) Government-sponsored residential mortgage-backed securities 324 $ — $ — $ 679,833 $ 2,700,630 $ 679,833 $ 2,700,630 Government-sponsored commercial mortgage-backed securities 188 — — 254,067 1,089,120 254,067 1,089,120 U.S. Agency bonds 23 — — 28,184 207,965 28,184 207,965 U.S. Treasury securities 6 104 4,854 6,171 88,365 6,275 93,219 State and municipal bonds and obligations 242 5,216 48,268 22,171 122,316 27,387 170,584 783 $ 5,320 $ 53,122 $ 990,426 $ 4,208,396 $ 995,746 $ 4,261,518 As of December 31, 2022 Less than 12 Months 12 Months or Longer Total # of Gross Fair Gross Fair Gross Fair (Dollars in thousands) Government-sponsored residential mortgage-backed securities 322 $ 42,196 $ 435,690 $ 701,659 $ 3,676,218 $ 743,855 $ 4,111,908 Government-sponsored commercial mortgage-backed securities 199 38,944 300,476 182,221 1,048,478 221,165 1,348,954 U.S. Agency bonds 37 645 4,145 147,764 948,337 148,409 952,482 U.S. Treasury securities 5 1,311 48,451 4,956 44,606 6,267 93,057 State and municipal bonds and obligations 237 14,942 179,614 14 225 14,956 179,839 Other debt securities 2 — — 14 1,285 14 1,285 802 $ 98,038 $ 968,376 $ 1,036,628 $ 5,719,149 $ 1,134,666 $ 6,687,525 The Company does not intend to sell these investments and has determined based upon available evidence that it is more-likely-than-not that the Company will not be required to sell each security before the expected recovery of its amortized cost basis. As a result, the Company did not recognize an ACL on these investments as of either September 30, 2023 or December 31, 2022. The causes of the impairments listed in the tables above by category are as follows as of September 30, 2023 and December 31, 2022: • Government-sponsored mortgage-backed securities, U.S. Agency bonds and U.S. Treasury securities – The securities with unrealized losses in these portfolios have contractual terms that generally do not permit the issuer to settle the security at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. Additionally, these securities are implicitly guaranteed by the U.S. government or one of its agencies. • State and municipal bonds and obligations – The securities with unrealized losses in this portfolio have contractual terms that generally do not permit the issuer to settle the security at a price less than the current par value of the investment. The decline in market value of these securities is attributable to changes in interest rates and not credit quality. • Other debt securities – As of December 31, 2022, there were two securities included in this portfolio in an unrealized loss position which consisted of two foreign debt securities. Both securities were performing in accordance with the terms of their respective contractual agreements. The decline in market value of these securities was attributable to changes in interest rates and not credit quality. Held to Maturity Securities The amortized cost, gross unrealized gains and losses, allowance for credit losses and fair value of held to maturity (“HTM”) securities as of the dates indicated were as follows: As of September 30, 2023 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 260,271 $ — $ (40,723) $ — $ 219,548 Government-sponsored commercial mortgage-backed securities 195,629 — (27,523) — 168,106 $ 455,900 $ — $ (68,246) $ — $ 387,654 As of December 31, 2022 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 276,493 $ — $ (30,150) $ — $ 246,343 Government-sponsored commercial mortgage-backed securities 200,154 — (23,271) — 176,883 $ 476,647 $ — $ (53,421) $ — $ 423,226 The Company did not record a provision for estimated credit losses on any HTM securities for either the three and nine months ended September 30, 2023 or 2022. The accrued interest receivable on HTM securities totaled $1.0 million as of both September 30, 2023 and December 31, 2022 and is included within other assets on the Consolidated Balance Sheets. The Company did not record any write-offs of accrued interest receivable on HTM securities during either the three and nine months ended September 30, 2023 or 2022. No securities held by the Company were delinquent on contractual payments as of either September 30, 2023 or December 31, 2022, nor were any securities placed on non-accrual status during the nine and twelve month periods then ended. Available for Sale and Held to Maturity Securities Contractual Maturity The amortized cost and estimated fair value of AFS and HTM securities by contractual maturities as of September 30, 2023 and December 31, 2022 are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. The scheduled contractual maturities of AFS and HTM securities as of the dates indicated were as follows: As of September 30, 2023 Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) AFS securities Government-sponsored residential mortgage-backed securities $ — $ — $ 27,697 $ 26,351 $ 28,637 $ 26,316 $ 3,324,129 $ 2,647,963 $ 3,380,463 $ 2,700,630 Government-sponsored commercial mortgage-backed securities — — 164,329 145,815 475,624 398,011 703,234 545,294 1,343,187 1,089,120 U.S. Agency bonds — — 226,493 199,833 9,656 8,132 — — 236,149 207,965 U.S. Treasury securities — — 99,494 93,219 — — — — 99,494 93,219 State and municipal bonds and obligations 210 210 29,120 26,998 42,656 38,408 125,985 104,968 197,971 170,584 Total available for sale securities 210 210 547,133 492,216 556,573 470,867 4,153,348 3,298,225 5,257,264 4,261,518 HTM securities Government-sponsored residential mortgage-backed securities — — — — — — 260,271 219,548 260,271 219,548 Government-sponsored commercial mortgage-backed securities — — — — 195,629 168,106 — — 195,629 168,106 Total held to maturity securities — — — — 195,629 168,106 260,271 219,548 455,900 387,654 Total $ 210 $ 210 $ 547,133 $ 492,216 $ 752,202 $ 638,973 $ 4,413,619 $ 3,517,773 $ 5,713,164 $ 4,649,172 As of December 31, 2022 Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) AFS securities Government-sponsored residential mortgage-backed securities $ — $ — $ 21,221 $ 20,284 $ 727,908 $ 648,132 $ 4,106,634 $ 3,443,492 $ 4,855,763 $ 4,111,908 Government-sponsored commercial mortgage-backed securities — — 191,762 171,992 649,659 556,641 728,698 620,321 1,570,119 1,348,954 U.S. Agency bonds — — 877,371 767,464 223,520 185,018 — — 1,100,891 952,482 U.S. Treasury securities — — 99,324 93,057 — — — — 99,324 93,057 State and municipal bonds and obligations 213 209 22,100 21,283 42,554 40,970 133,172 120,630 198,039 183,092 Other debt securities 1,299 1,285 — — — — — — 1,299 1,285 Total available for sale securities 1,512 1,494 1,211,778 1,074,080 1,643,641 1,430,761 4,968,504 4,184,443 7,825,435 6,690,778 HTM securities Government-sponsored residential mortgage-backed securities — — — — — — 276,493 246,343 276,493 246,343 Government-sponsored commercial mortgage-backed securities — — — — 200,154 176,883 0 — — 200,154 176,883 Total held to maturity securities — — — — 200,154 176,883 276,493 246,343 476,647 423,226 Total $ 1,512 $ 1,494 $ 1,211,778 $ 1,074,080 $ 1,843,795 $ 1,607,644 $ 5,244,997 $ 4,430,786 $ 8,302,082 $ 7,114,004 Securities Pledged as Collateral As of September 30, 2023 and December 31, 2022, securities with a carrying value of $429.0 million and $437.9 million, respectively, were pledged to secure public deposits and for other purposes required by law. As of September 30, 2023 and December 31, 2022, deposits with associated pledged collateral included cash accounts from the Company’s wealth management division (“Eastern Wealth Management”) and municipal deposit accounts. In March 2023 the Federal Reserve created the Bank Term Funding Program (the “Program”) in order to support American businesses and households. The Program helps make available additional funding to eligible depository institutions in order to help assure banks have the ability to meet the needs of their depositors. The Program offers loans up to one year in length to banks in return for any collateral eligible for purchase by the Federal Reserve Banks in open market operations, such as U.S. Treasuries, U.S. agency securities, and U.S. agency mortgage-backed securities. As of September 30, 2023, securities with a carrying value of $2.5 billion were pledged as collateral through the Program. In addition, the Company pledged securities with a carrying value of $370.3 million to the Federal Reserve Discount Window (the “Discount Window”) as of September 30, 2023. No securities were pledged to the Program or the Discount Window as of December 31, 2022.

Loans and Allowance for Credit

Loans and Allowance for Credit Losses	9 Months Ended
Loans and Allowance for Credit Losses	Sep. 30, 2023
Receivables [Abstract]
Loans and Allowance for Credit Losses	Loans and Allowance for Credit Losses Loans The following table provides a summary of the Company’s loan portfolio as of the dates indicated: September 30, 2023 December 31, 2022 (In thousands) Commercial and industrial $ 3,087,509 $ 3,150,946 Commercial real estate 5,396,912 5,155,323 Commercial construction 382,615 336,276 Business banking 1,087,799 1,090,492 Residential real estate 2,550,861 2,460,849 Consumer home equity 1,193,859 1,187,547 Other consumer (2)(3) 219,720 194,098 Gross loans before unamortized premiums, unearned discounts and deferred fees 13,919,275 13,575,531 Allowance for loan losses (1) (155,146) (142,211) Unamortized premiums, net of unearned discounts and deferred fees (19,307) (13,003) Loans after the allowance for loan losses, unamortized premiums, unearned discounts and deferred fees $ 13,744,822 $ 13,420,317 (1) The balance of accrued interest receivable excluded from amortized cost and the calculation of the allowance for loan losses amounted to $50.8 million and $45.2 million as of September 30, 2023 and December 31, 2022, respectively, and is included within other assets on the Consolidated Balance Sheets. (2) Automobile loans are included in the other consumer portfolio and amounted to $8.1 million and $18.1 million at September 30, 2023 and December 31, 2022, respectively. (3) Home improvement loans are included in the other consumer portfolio and amounted to $161.2 million and $121.1 million at September 30, 2023 and December 31, 2022, respectively. There are no other loan categories that exceed 10% of total loans not already reflected in the preceding table. The Company’s lending activities are conducted principally in the New England area with the exception of its Shared National Credit Program (“SNC Program”) portfolio. The Company participates in the SNC Program in an effort to improve its industry and geographical diversification. The SNC Program portfolio is included in the Company’s commercial and industrial portfolio. The SNC Program portfolio is defined as loan syndications with exposure over $100 million and with three or more lenders participating. Most loans originated by the Company are either collateralized by real estate or other assets or guaranteed by federal and local governmental authorities. The ability and willingness of the single-family residential and consumer borrowers to honor their repayment commitments is generally dependent on the level of overall economic activity within the borrowers’ geographic areas and real estate values. The ability and willingness of commercial real estate, commercial and industrial, and construction loan borrowers to honor their repayment commitments is generally dependent on the health of the real estate economy in the borrowers’ geographic areas and the general economy. Loans Pledged as Collateral The carrying value of loans pledged to secure advances from the Federal Home Loan Bank (“FHLB”) of Boston (“FHLBB”) were $4.2 billion and $3.9 billion at September 30, 2023 and December 31, 2022, respectively. The balance of funds borrowed from the FHLBB were $673.5 million and $704.1 million at September 30, 2023 and December 31, 2022, respectively. The carrying value of loans pledged to secure advances from the Federal Reserve Bank (“FRB”) were $1.1 billion at both September 30, 2023 and December 31, 2022, respectively. There were no funds borrowed from the FRB outstanding at September 30, 2023 or December 31, 2022. Serviced Loans At September 30, 2023 and December 31, 2022, mortgage loans partially or wholly-owned by others and serviced by the Company amounted to approximately $78.8 million and $84.0 million, respectively. Purchased Loans The Company began purchasing residential real estate mortgage loans during the third quarter of 2022. Loans purchased were subject to the same underwriting criteria as those loans originated directly by the Company. During the nine months ended September 30, 2023, the Company purchased $32.0 million of residential real estate mortgage loans. The Company ceased purchases of residential real estate mortgage loans in the first quarter of 2023. Accordingly, no residential real estate mortgage loans were purchased during the three months ended September 30, 2023. The Company purchased $79.9 million of residential real estate mortgage loans during the three and nine months ended September 30, 2022. As of September 30, 2023 and December 31, 2022, the amortized cost balance of loans purchased was $391.7 million and $376.1 million, respectively. Commercial Loan Sales During the three and nine months ended September 30, 2023, the Company sold $191.8 million of commercial and industrial loans previously included in the SNC program portfolio and recognized a loss on sale of $2.5 million. As of September 30, 2023, one commercial and industrial loan, which was previously included in the SNC program portfolio and which had a balance of $22.4 million as of September 30, 2023, was transferred to held for sale from the commercial and industrial held for investment portfolio. Upon transfer to held for sale, a mark-to-market adjustment was recorded representing a loss of $0.2 million. Allowance for Loan Losses The allowance for loan losses is established to provide for management’s estimate of expected lifetime credit losses on loans measured at amortized cost at the balance sheet date through a provision for loan losses charged to net income. Charge-offs, net of recoveries, are charged directly to the allowance for loan losses. Commercial and residential loans are charged-off in the period in which they are deemed uncollectible. Delinquent loans in these product types are subject to ongoing review and analysis to determine if a charge-off in the current period is appropriate. For consumer loans, policies and procedures exist that require charge-off consideration upon a certain triggering event depending on the product type. The following tables summarize the changes in the allowance for loan losses by loan category for the periods indicated: For the Three Months Ended September 30, 2023 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 29,535 $ 59,524 $ 7,663 $ 15,228 $ 27,012 $ 6,044 $ 2,949 $ 147,955 Charge-offs (11) — — (303) — — (731) (1,045) Recoveries 120 2 — 609 30 39 108 908 Provision (release) (3,126) 11,097 136 (316) (687) (601) 825 7,328 Ending balance $ 26,518 $ 70,623 $ 7,799 $ 15,218 $ 26,355 $ 5,482 $ 3,151 $ 155,146 For the Three Months Ended September 30, 2022 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 25,852 $ 47,555 $ 5,474 $ 16,699 $ 21,663 $ 5,662 $ 2,626 $ 125,531 Charge-offs (11) — — (369) — — (603) (983) Recoveries 126 3 — 286 56 6 158 635 Provision (release) 874 3,545 507 (354) 1,288 174 446 6,480 Ending balance $ 26,841 $ 51,103 $ 5,981 $ 16,262 $ 23,007 $ 5,842 $ 2,627 $ 131,663 For the Nine Months Ended September 30, 2023 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 26,859 $ 54,730 $ 7,085 $ 16,189 $ 28,129 $ 6,454 $ 2,765 $ 142,211 Cumulative effect of change in accounting principle (1) 47 — — (140) (849) (201) — (1,143) Charge-offs (11) — — (900) — (7) (1,883) (2,801) Recoveries 285 8 — 1,294 63 40 335 2,025 Provision (release) (662) 15,885 714 (1,225) (988) (804) 1,934 14,854 Ending balance $ 26,518 $ 70,623 $ 7,799 $ 15,218 $ 26,355 $ 5,482 $ 3,151 $ 155,146 For the Nine Months Ended September 30, 2022 Commercial Commercial Commercial Business Residential Consumer Other Other Total (In thousands) Allowance for loan losses: Beginning balance $ 18,018 $ 52,373 $ 2,585 $ 10,983 $ 6,556 $ 3,722 $ 3,308 $ 242 $ 97,787 Cumulative effect of change in accounting principle (2) 11,533 (6,655) 1,485 6,160 13,489 1,857 (541) (242) $ 27,086 Charge-offs (13) — — (1,922) — — (1,754) — (3,689) Recoveries 1,074 53 — 1,678 80 16 533 — 3,434 Provision (release) (3,771) 5,332 1,911 (637) 2,882 247 1,081 — 7,045 Ending balance $ 26,841 $ 51,103 $ 5,981 $ 16,262 $ 23,007 $ 5,842 $ 2,627 $ — $ 131,663 (1) Represents the adjustment needed to reflect the cumulative day one impact pursuant to the Company’s adoption of ASU 2022-02 (i.e., cumulative effect adjustment related to the adoption of ASU 2022-02 as of January 1, 2023). The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for loan losses resulting from the Company’s adoption of the standard. (2) Represents the adjustment needed to reflect the cumulative day one impact pursuant to the Company’s adoption of ASU 2016-13 (i.e., cumulative effect adjustment related to the adoption of ASU 2016-13 as of January 1, 2022). The adjustment represents a $27.1 million increase to the allowance attributable to the change in accounting methodology for estimating the allowance for loan losses resulting from the Company’s adoption of the standard. The adjustment also includes the adjustment needed to reflect the day one reclassification of the Company’s PCI loan balances to PCD and the associated gross-up of $0.1 million, pursuant to the Company’s adoption of ASU 2016-13. Reserve for Unfunded Commitments Management evaluates the need for a reserve on unfunded lending commitments in a manner consistent with loans held for investment. The Company’s adoption of ASU 2022-02 on January 1, 2023 did not impact the reserve for unfunded lending commitments. Upon adoption of ASU 2016-13 on January 1, 2022, the Company recorded a transition adjustment related to the reserve for unfunded lending commitments of $1.0 million, resulting in a total reserve for unfunded lending commitments of $11.1 million as of January 1, 2022. As of September 30, 2023 and December 31, 2022, the Company’s reserve for unfunded lending commitments was $14.9 million and $13.2 million, respectively, which is recorded within other liabilities in the Company's Consolidated Balance Sheets. Portfolio Segmentation Management uses a methodology to systematically estimate the amount of expected losses in each segment of loans in the Company’s portfolio. Commercial and industrial business banking, investment commercial real estate, and commercial and industrial loans are evaluated based upon loan-level risk characteristics, historical losses and other factors which form the basis for estimating expected losses. Other portfolios, including owner occupied commercial real estate (which includes business banking owner occupied commercial real estate), commercial construction, residential mortgages, home equity and consumer loans, are analyzed as groups taking into account delinquency ratios, and the Company’s and peer banks’ historical loss experience. For the purposes of estimating the allowance for loan losses, management segregates the loan portfolio into loan categories that share similar risk characteristics such as the purpose of the loan, repayment source, and collateral. These characteristics are considered when determining the appropriate level of the allowance for each category. Some examples of these risk characteristics unique to each loan category include: Commercial Lending Commercial and industrial : The primary risk associated with commercial and industrial loans is the ability of borrowers to achieve business results consistent with those projected at origination. Collateral frequently consists of a first lien position on business assets including, but not limited to, accounts receivable, inventory, aircraft and equipment. The primary repayment source is operating cash flow and, secondarily, the liquidation of assets. Under its lending guidelines, the Company generally requires a corporate or personal guarantee from individuals that hold material ownership in the borrowing entity when the loan-to-value of a commercial and industrial loan is in excess of a specified threshold. Commercial real estate : Collateral values are established by independent third-party appraisals and evaluations. Primary repayment sources include operating income generated by the real estate, permanent debt refinancing, sale of the real estate and, secondarily, liquidation of the collateral. Under its lending guidelines, the Company generally requires a corporate or personal guarantee from individuals that hold material ownership in the borrowing entity when the loan-to-value of a commercial real estate loan is in excess of a specified threshold. Commercial construction : These loans are generally considered to present a higher degree of risk than other real estate loans and may be affected by a variety of factors, such as adverse changes in interest rates and the borrower’s ability to control costs and adhere to time schedules. Construction loans are underwritten utilizing feasibility studies, independent appraisal reviews, sensitivity analysis of absorption and lease rates and financial analysis of the developers and property owners. Construction loans are generally based upon estimates of costs and value associated with the completed project. Construction loan repayment is substantially dependent on the ability of the borrower to complete the project and obtain permanent financing. Business banking : These loans are typically secured by all business assets or commercial real estate. Business banking originations include traditionally underwritten loans as well as partially automated scored loans. Business banking scored loans are determined by utilizing the Company’s proprietary decision matrix that has a number of quantitative factors including, but not limited to, a guarantor’s credit score, industry risk, and time in business. The Company also engages in Small Business Association (“SBA”) lending. The SBA guarantees reduce the Company’s loss due to default and are considered a credit enhancement to the loan structure. Residential Lending These loans are made to borrowers who demonstrate the ability to repay principal and interest on a monthly basis. Underwriting considerations include, among others, income sources and their reliability, willingness to repay as evidenced by credit repayment history, financial resources (including cash reserves) and the value of the collateral. The Company maintains policy standards for minimum credit score and cash reserves and maximum loan-to-value consistent with a “prime” portfolio. Collateral consists of mortgage liens on 1-4 family residential dwellings. The policy standards applied to loans originated by the Company are the same as those applied to purchased loans. The Company does not originate or purchase sub-prime or other high-risk loans. Residential loans are originated either for sale to investors or retained in the Company’s loan portfolio. Decisions about whether to sell or retain residential loans are made based on the interest rate characteristics, pricing for loans in the secondary mortgage market, competitive factors and the Company’s capital needs. Consumer Lending Consumer home equity : Home equity lines of credit are granted for ten years with monthly interest-only repayment requirements. Full principal repayment is required at the end of the ten-year draw period. Home equity loans are term loans that require the monthly payment of principal and interest such that the loan will be fully amortized at maturity. Underwriting considerations are materially consistent with those utilized in residential real estate. Collateral consists of a senior or subordinate lien on owner-occupied residential property. Other consumer : The Company’s policy and underwriting in this category, which is comprised primarily of home improvement, automobile and aircraft loans, include the following factors, among others: income sources and reliability, credit histories, term of repayment, and collateral value, as applicable. These are typically granted on an unsecured basis, with the exception of aircraft and automobile loans. Credit Quality Commercial Lending Credit Quality The credit quality of the Company’s commercial loan portfolio is actively monitored and supported by a comprehensive credit approval process and all large dollar transactions are sent for approval to a committee of seasoned business line and credit professionals. The Company maintains an independent credit risk review function that reports directly to the Risk Management Committee of the Board of Directors. Credits that demonstrate significant deterioration in credit quality are transferred to a specialized group of experienced officers for individual attention. The Company monitors credit quality indicators and utilizes portfolio scorecards to assess the risk of its commercial portfolio. Specifically, the Company utilizes a 15-point credit risk-rating system to manage risk and identify potential problem loans. Under this point system, risk-rating assignments are based upon a number of quantitative and qualitative factors that are under continual review. Factors include cash flow, collateral coverage, liquidity, leverage, position within the industry, internal controls and management, financial reporting, and other considerations. Commercial loan risk ratings are (re)evaluated for each loan at least once-per-year. The risk-rating categories under the credit risk-rating system are defined as follows: 0 Risk Rating - Unrated Certain segments of the portfolios are not rated. These segments include aircraft loans, business banking scored loan products, and other commercial loans managed by exception. Loans within this unrated loan segment are monitored by delinquency status; and for lines of credit greater than $100,000 in exposure, an annual review is conducted which includes the review of the business score and loan and deposit account performance. The Company supplements performance data with current business credit scores for the business banking portfolio on a quarterly basis. Unrated commercial and business banking loans are generally restricted to commercial exposure of less than $1.5 million. Loans included in this category generally are not required to provide regular financial reporting or regular covenant monitoring. For purposes of estimating the allowance for loan losses, unrated loans are considered in the same manner as “Pass” rated loans. Unrated loans are included with “Pass” rated loans for disclosure purposes. 1-10 Risk Rating – Pass Loans with a risk rating of 1-10 are classified as “Pass” and are comprised of loans that range from “substantially risk free” which indicates borrowers of unquestioned credit standing, well-established national companies with a very strong financial condition, and loans fully secured by policy conforming cash levels, through “low pass” which indicates acceptable rated loans that may be experiencing weak cash flow, impending lease rollover or minor liquidity concerns. 11 Risk Rating – Special Mention (Potential Weakness) Loans to borrowers in this category exhibit potential weaknesses or downward trends deserving management’s close attention. While potentially weak, no loss of principal or interest is envisioned. Included in this category are borrowers who are performing as agreed, are weak when compared to industry standards, may be experiencing an interim loss and may be in declining industries. An element of asset quality, financial flexibility or management is below average. The Company does not consider borrowers within this category as new business prospects. Borrowers rated special mention may find it difficult to obtain alternative financing from traditional bank sources. 12 Risk Rating – Substandard (Well-Defined Weakness) Loans with a risk-rating of 12 exhibit well-defined weaknesses that, if not corrected, may jeopardize the orderly liquidation of the debt. A loan is classified as substandard if it is inadequately protected by the repayment capacity of the obligor or by the collateral pledged. Specifically, repayment under market rates and terms, or by the requirements under the existing loan documents, is in jeopardy, but no loss of principal or interest is envisioned. There is a possibility that a partial loss of principal and/or interest will occur in the future if the deficiencies are not corrected. Loss potential, while existing in the aggregate portfolio of substandard assets, does not have to exist in individual assets classified as substandard. Non-accrual is possible, but not mandatory, in this class. 13 Risk Rating – Doubtful (Loss Probable) Loans classified as doubtful have comparable weaknesses as found in the loans classified as substandard, with the added provision that such weaknesses make collection of the debt in full (based on currently existing facts, conditions and values) highly questionable and improbable. Serious problems exist such that a partial loss of principal is likely. The probability of loss exists, but because of reasonably specific pending factors that may work to strengthen the credit, estimated losses are deferred until a more exact status can be determined. Specific reserves will be the amount identified after specific review. Non-accrual is mandatory in this class. 14 Risk Rating – Loss Loans to borrowers in this category are deemed incapable of repayment. Loans to such borrowers are considered uncollectible and of such little value that continuance as active assets of the Company is not warranted. This classification does not mean that the loans have no recovery or salvage value, but rather, it is not practical or desirable to defer writing off these assets even though partial recovery may occur in the future. Loans in this category have a recorded investment of $0 at the time of the downgrade. Residential and Consumer Lending Credit Quality For the Company’s residential and consumer portfolios, the quality of the loan is best indicated by the repayment performance of an individual borrower. Updated appraisals, broker opinions of value and other collateral valuation methods are employed in the residential and consumer portfolios, typically for credits that are deteriorating. Delinquency status is determined using payment performance, while accrual status may be determined using a combination of payment performance, expected borrower viability and collateral value. Delinquent consumer loans are handled by a team of seasoned collection specialists. The following table details the amortized cost balances of the Company’s loan portfolios, presented by credit quality indicator and origination year as of September 30, 2023, and gross charge-offs for the nine month period then ended: 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total (In thousands) Commercial and industrial Pass $ 421,454 $ 489,139 $ 377,921 $ 351,075 $ 160,669 $ 656,163 $ 497,576 $ 3,555 $ 2,957,552 Special Mention 8,109 30,704 14,345 13,897 186 633 18,711 456 87,041 Substandard — 12 1,808 422 36 2,672 22,799 — 27,749 Doubtful — — — — — 8 — — 8 Loss — — — — — — — — — Total commercial and industrial 429,563 519,855 394,074 365,394 160,891 659,476 539,086 4,011 3,072,350 Current period gross charge-offs — — — — — 11 — — 11 Commercial real estate Pass 372,774 1,467,477 858,225 575,634 524,549 1,342,646 59,152 2,585 5,203,042 Special Mention — — — 744 2,395 28,343 — — 31,482 Substandard — — 15,356 3,990 50,704 54,851 8,005 — 132,906 Doubtful — — — — — 25,797 — — 25,797 Loss — — — — — — — — — Total commercial real estate 372,774 1,467,477 873,581 580,368 577,648 1,451,637 67,157 2,585 5,393,227 Current period gross charge-offs — — — — — — — — — Commercial construction Pass 99,843 140,590 124,288 — — — 10,727 — 375,448 Special Mention 5,182 — — 7 — — — — 5,189 Substandard — — — — — — — — — Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial construction 105,025 140,590 124,288 7 — — 10,727 — 380,637 Current period gross charge-offs — — — — — — — — — Business banking Pass 107,950 164,497 187,765 152,567 117,485 252,479 71,942 3,433 1,058,118 Special Mention — 572 1,446 3,579 3,778 8,233 1,019 27 18,654 Substandard 1,401 611 3,554 2,127 1,069 3,452 647 584 13,445 Doubtful — — — 20 1,079 500 — — 1,599 Loss — — — — — — — — — Total business banking 109,351 165,680 192,765 158,293 123,411 264,664 73,608 4,044 1,091,816 Current period gross charge-offs — 111 62 56 102 250 23 296 900 Residential real estate Current and accruing 203,704 742,941 672,492 362,610 95,373 464,070 — — 2,541,190 30-89 days past due and accruing 441 4,032 4,343 905 940 8,855 — — 19,516 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 105 726 454 1,000 288 5,502 — — 8,075 Total residential real estate 204,250 747,699 677,289 364,515 96,601 478,427 — — 2,568,781 Current period gross charge-offs — — — — — — — — — Consumer home equity Current and accruing 27,721 86,954 9,557 5,189 4,356 84,939 954,862 7,028 1,180,606 30-89 days past due and accruing — 196 — — — 647 7,675 377 8,895 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — 67 — — — 1,788 5,472 179 7,506 Total consumer home equity 27,721 87,217 9,557 5,189 4,356 87,374 968,009 7,584 1,197,007 Current period gross charge-offs — — — — — — 7 — 7 Other consumer Current and accruing 72,222 39,286 26,060 13,635 12,949 18,047 13,030 112 195,341 30-89 days past due and accruing 126 143 61 19 68 183 28 — 628 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 13 62 10 — — 47 — 49 181 Total other consumer 72,361 39,491 26,131 13,654 13,017 18,277 13,058 161 196,150 Current period gross charge-offs 746 307 296 90 84 200 160 — 1,883 Total $ 1,321,045 $ 3,168,009 $ 2,297,685 $ 1,487,420 $ 975,924 $ 2,959,855 $ 1,671,645 $ 18,385 $ 13,899,968 (1) The amounts presented represent the amortized cost as of September 30, 2023 of revolving loans that were converted to term loans during the nine months ended September 30, 2023. The following table details the amortized cost balances of the Company’s loan portfolios, presented by credit quality indicator and origination year as of December 31, 2022 : 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total (In thousands) Commercial and industrial Pass $ 778,144 $ 479,317 $ 415,990 $ 199,865 $ 100,716 $ 639,825 $ 473,148 $ 50 $ 3,087,055 Special Mention 2,298 1,307 7,267 4,841 147 — 1,196 670 17,726 Substandard 294 4,954 2,644 46 2,598 7,854 485 346 19,221 Doubtful — 5,249 — — — 23 3,254 — 8,526 Loss — — — — — — — — — Total commercial and industrial 780,736 490,827 425,901 204,752 103,461 647,702 478,083 1,066 3,132,528 Commercial real estate Pass 1,510,675 825,620 586,567 581,840 461,296 1,006,160 52,590 4,187 5,028,935 Special Mention — — 771 4,204 15,366 12,255 — — 32,596 Substandard — — 2,621 19,796 24,532 34,883 8,000 — 89,832 Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial real estate 1,510,675 825,620 589,959 605,840 501,194 1,053,298 60,590 4,187 5,151,363 Commercial construction Pass 91,397 178,648 28,956 20,767 — — 12,130 — 331,898 Special Mention — — 2,361 — — — — — 2,361 Substandard — — — — — — — — — Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial construction 91,397 178,648 31,317 20,767 — — 12,130 — 334,259 Business banking Pass 178,806 202,230 170,088 128,282 59,452 233,484 78,080 4,770 1,055,192 Special Mention — 991 4,635 4,605 3,740 7,584 145 — 21,700 Substandard — 3,482 1,424 2,663 570 7,505 2,230 221 18,095 Doubtful — — — 181 — 70 — — 251 Loss — — — — — — — — — Total business banking 178,806 206,703 176,147 135,731 63,762 248,643 80,455 4,991 1,095,238 Residential real estate Current and accruing 761,442 696,959 382,262 99,494 66,702 434,720 — — 2,441,579 30-89 days past due and accruing 4,652 5,470 1,245 2,762 2,951 11,646 — — 28,726 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — — 144 1,491 1,015 7,100 — — 9,750 Total residential real estate 766,094 702,429 383,651 103,747 70,668 453,466 — — 2,480,055 Consumer home equity Current and accruing 97,395 10,774 5,840 5,015 21,092 73,927 953,829 7,320 1,175,192 30-89 days past due and accruing 559 — — — 72 944 7,239 247 9,061 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — — — 61 274 1,303 5,120 296 7,054 Total consumer home equity 97,954 10,774 5,840 5,076 21,438 76,174 966,188 7,863 1,191,307 Other consumer Current and accruing 55,414 32,390 17,641 18,298 18,832 16,603 17,476 — 176,654 30-89 days past due and accruing 143 68 43 61 240 178 58 7 798 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 31 93 39 2 92 44 15 10 326 Total other consumer 55,588 32,551 17,723 18,361 19,164 16,825 17,549 17 177,778 Total $ 3,481,250 $ 2,447,552 $ 1,630,538 $ 1,094,274 $ 779,687 $ 2,496,108 $ 1,614,995 $ 18,124 $ 13,562,528 (1) The amounts presented represent the amortized cost as of December 31, 2022 of revolving loans that were converted to term loans during the year ended December 31, 2022. Asset Quality The Company manages its loan portfolio with careful monitoring. As a general rule, loans more than 90 days past due with respect to principal and interest are classified as non-accrual loans. Exceptions may be made if management believes that collateral held by the Company is clearly sufficient and in full satisfaction of both principal and interest. The Company may also use discretion regarding other loans over 90 days delinquent if the loan is well secured and in the process of collection. Non-accrual loans and loans that are more than 90 days past due but still accruing interest are considered non-performing loans. Non-accrual loans may be returned to an accrual status when principal and interest payments are no longer delinquent, and the risk characteristics of the loan have improved to the extent that there no longer exists a concern as to the collectability of principal and interest. Loans are considered past due based upon the number of days delinquent according to their contractual terms. A loan is expected to remain on non-accrual status until it becomes current with respect to principal and interest, the loan is liquidated, or the loan is determined to be uncollectible and is charged-off against the allowance for loan losses. The following tables show the age analysis of past due loans as of the dates indicated: As of September 30, 2023 30-59 60-89 90 or More Total Past Current Total (In thousands) Commercial and industrial $ 1,030 $ — $ 465 $ 1,495 $ 3,070,855 $ 3,072,350 Commercial real estate — — — — 5,393,227 5,393,227 Commercial construction — — — — 380,637 380,637 Business banking 4,536 1,846 1,539 7,921 1,083,895 1,091,816 Residential real estate 17,988 2,846 5,621 26,455 2,542,326 2,568,781 Consumer home equity 6,232 2,661 7,430 16,323 1,180,684 1,197,007 Other consumer 470 158 181 809 195,341 196,150 Total $ 30,256 $ 7,511 $ 15,236 $ 53,003 $ 13,846,965 $ 13,899,968 As of December 31, 2022 30-59 60-89 90 or More Total Past Current Total (In thousands) Commercial and industrial $ 1,300 $ 385 $ 2,074 $ 3,759 $ 3,128,769 $ 3,132,528 Commercial real estate — — — — 5,151,363 5,151,363 Commercial construction — — — — 334,259 334,259 Business banking 6,642 845 3,517 11,004 1,084,234 1,095,238 Residential real estate 25,877 3,852 6,456 36,185 2,443,870 2,480,055 Consumer home equity 8,262 1,108 6,525 15,895 1,175,412 1,191,307 Other consumer 634 170 320 1,124 176,654 177,778 Total (1) $ 42,715 $ 6,360 $ 18,892 $ 67,967 $ 13,494,561 $ 13,562,528 (1) The amounts presented in the table above represent the recorded investment balance of loans as of December 31, 2022. The following table presents information regarding non-accrual loans as of the dates indicated: As of September 30, 2023 As of December 31, 2022 Non-Accrual Loans With ACL Non-Accrual Loans Without ACL (1) Total Nonaccrual Loans Non-Accrual Loans With ACL Non-Accrual Loans Without ACL (1) Total Nonaccrual Loans (In thousands) Commercial and industrial $ 4 $ 466 $ 470 $ 3,270 $ 10,707 $ 13,977 Commercial real estate 25,797 — 25,797 — — — Commercial construction — — — — — — Business banking 5,422 14 5,436 5,844 1,653 7,497 Residential real estate 8,075 — 8,075 9,750 — 9,750 Consumer home equity 7,506 — 7,506 7,054 — 7,054 Other consumer 181 — 181 326 — 326 Total non-accrual loans $ 46,985 $ 480 $ 47,465 $ 26,244 $ 12,360 $ 38,604 (1) The loans on non-accrual status and without an ACL as of both September 30, 2023 and December 31, 2022 , were primarily comprised of collateral dependent loans for which the fair value of the underlying l

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2023
Leases [Abstract]
Leases	Leases The Company leases certain office space and equipment under various non-cancelable operating leases. These leases have original terms ranging from 1 year to 25 years. Operating lease liabilities and right-of-use (“ROU”) assets are recognized at the lease commencement date based upon the present value of the future minimum lease payments over the lease term. Operating lease liabilities are recorded within other liabilities and ROU assets are recorded within other assets in the Company’s Consolidated Balance Sheets. The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. As of the dates indicated, the Company had the following related to operating leases: As of September 30, 2023 As of December 31, 2022 (In thousands) Right-of-use assets $ 52,727 $ 48,817 Lease liabilities 55,852 52,105 Finance leases are not material. Finance lease liabilities are recorded within other liabilities and finance ROU assets are recorded within other assets in the Company’s Consolidated Balance Sheets. The following table is a summary of the Company’s components of net lease cost for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Operating lease cost $ 2,974 $ 3,182 $ 8,929 $ 9,670 Finance lease cost 87 77 246 231 Variable lease cost 655 577 1,993 1,914 Total lease cost $ 3,716 $ 3,836 $ 11,168 $ 11,815 During the three and nine months ended September 30, 2023, the Company made $3.2 million and $9.7 million, respectively, in cash payments for operating and finance lease payments. During the three and nine months ended September 30, 2022, the Company made $3.3 million and $11.8 million, respectively, in cash payments for operating and finance lease payments. Supplemental balance sheet information related to operating leases are as follows: As of September 30, 2023 As of December 31, 2022 Weighted-average remaining lease term (in years) 8.51 7.26 Weighted-average discount rate 3.73 % 2.62 % The following table sets forth the undiscounted cash flows of base rent related to operating leases outstanding as of September 30, 2023 with payments scheduled over the next five years and thereafter, including a reconciliation to the operating lease liability recognized in other liabilities in the Company’s Consolidated Balance Sheets: As of September 30, 2023 Year (In thousands) Remainder of 2023 $ 3,167 2024 10,183 2025 7,772 2026 6,682 2027 5,543 Thereafter 33,587 Total minimum lease payments 66,934 Less: amount representing interest 11,082 Present value of future minimum lease payments $ 55,852
Leases	Leases The Company leases certain office space and equipment under various non-cancelable operating leases. These leases have original terms ranging from 1 year to 25 years. Operating lease liabilities and right-of-use (“ROU”) assets are recognized at the lease commencement date based upon the present value of the future minimum lease payments over the lease term. Operating lease liabilities are recorded within other liabilities and ROU assets are recorded within other assets in the Company’s Consolidated Balance Sheets. The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. As of the dates indicated, the Company had the following related to operating leases: As of September 30, 2023 As of December 31, 2022 (In thousands) Right-of-use assets $ 52,727 $ 48,817 Lease liabilities 55,852 52,105 Finance leases are not material. Finance lease liabilities are recorded within other liabilities and finance ROU assets are recorded within other assets in the Company’s Consolidated Balance Sheets. The following table is a summary of the Company’s components of net lease cost for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Operating lease cost $ 2,974 $ 3,182 $ 8,929 $ 9,670 Finance lease cost 87 77 246 231 Variable lease cost 655 577 1,993 1,914 Total lease cost $ 3,716 $ 3,836 $ 11,168 $ 11,815 During the three and nine months ended September 30, 2023, the Company made $3.2 million and $9.7 million, respectively, in cash payments for operating and finance lease payments. During the three and nine months ended September 30, 2022, the Company made $3.3 million and $11.8 million, respectively, in cash payments for operating and finance lease payments. Supplemental balance sheet information related to operating leases are as follows: As of September 30, 2023 As of December 31, 2022 Weighted-average remaining lease term (in years) 8.51 7.26 Weighted-average discount rate 3.73 % 2.62 % The following table sets forth the undiscounted cash flows of base rent related to operating leases outstanding as of September 30, 2023 with payments scheduled over the next five years and thereafter, including a reconciliation to the operating lease liability recognized in other liabilities in the Company’s Consolidated Balance Sheets: As of September 30, 2023 Year (In thousands) Remainder of 2023 $ 3,167 2024 10,183 2025 7,772 2026 6,682 2027 5,543 Thereafter 33,587 Total minimum lease payments 66,934 Less: amount representing interest 11,082 Present value of future minimum lease payments $ 55,852

Goodwill and Other Intangibles

Goodwill and Other Intangibles	9 Months Ended
Goodwill and Other Intangibles	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other Intangibles The table below sets forth the carrying amount of goodwill and other intangible assets, net of accumulated amortization, for the banking business as of the dates indicated below. The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. As of September 30, 2023 As of December 31, 2022 (In thousands) Balances not subject to amortization Goodwill $ 557,635 $ 557,635 Balances subject to amortization Core deposit intangible (1) 9,074 10,374 Total goodwill and other intangible assets $ 566,709 $ 568,009 (1) Management performs an assessment of the remaining useful lives of the Company’s intangible assets on a quarterly basis to determine if such lives remain appropriate. As a result of the assessment performed during the second quarter of 2023, management reduced the remaining useful life of its core deposit intangible to five years which resulted in an increase in quarterly amortization expense. The effect of the increase on annual amortization expense was not material. The Company quantitatively assesses goodwill for impairment at the reporting unit level on an annual basis or sooner if an event occurs or circumstances change which might indicate that the fair value of a reporting unit is below its carrying amount. The Company has identified and assigned goodwill to two reporting units - the banking business and insurance agency business. As a result of the decision to sell the insurance agency business, the assets and liabilities of the insurance agency segment were classified as held for sale as of September 30, 2023 and, accordingly, are presented as assets and liabilities of discontinued operations on the Consolidated Balance Sheet. As of September 30, 2023, an impairment assessment was performed as it relates to goodwill and other intangible assets of the insurance agency business reporting unit whereby the agreed upon sales price was compared to the net assets included in the disposal group. As the sales price exceeded the net assets of the disposal group, management concluded the goodwill and intangible assets of the insurance agency business were not impaired as of September 30, 2023. In accordance with the accounting guidance codified in ASC 350-20, the Company performs a test of goodwill for impairment at least on an annual basis. An assessment is also required to be performed to the extent relevant events and/or circumstances occur which may indicate it is more-likely-than-not that the fair value of a reporting unit is less than its carrying amount. The failure of several banks in early 2023 led to economic uncertainty and an increase in volatility in the capital markets, particularly in the banking industry. Accordingly, the Company performed a qualitative assessment as of March 31, 2023 which included an assessment of current industry conditions and the impacts of those conditions on the Company’s financial position and results of operations. As a result of that assessment, the Company determined it was not more-likely-than-not that the carrying value of goodwill was greater than the fair value as of March 31, 2023. Therefore, a quantitative goodwill impairment test was not considered necessary at that time. During the second quarter of 2023, as the economic uncertainty impacting the banking industry persisted, the Company exercised the option afforded by ASC 350-20 and bypassed the qualitative assessment, opting to perform the quantitative impairment assessment irrespective of qualitative factors. The assessment included a comparison of the banking business’ book value to the implied fair value using a pricing multiple of the Company’s tangible book value as well as a comparison of the banking business’ book value to its discounted cash flows. The assessment also included a market capitalization analysis. Based upon the assessment, it was determined there was no impairment of the Company’s goodwill as of June 30, 2023. The Company performed its annual assessment for the banking business as of September 30, 2023. Similar to the assessment performed as of June 30, 2023, the assessment included a comparison of the banking business’ book value to the implied fair value using a pricing multiple of the Company’s tangible book value as well as a comparison of the banking business’ book value to its discounted cash flows. The assessment also included a market capitalization analysis. Based upon the assessment, it was determined there was no impairment of the Company’s goodwill as of September 30, 2023. Similarly, other intangible assets are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. Management performed a review of the Company’s intangible assets as of March 31, 2023, June 30, 2023 and September 30, 2023 in response to the circumstances indicated above. Based upon those reviews, the Company concluded that it was not more-likely-than-not that the carrying amount of the core deposit intangible may not be recoverable. Management had also previously performed an assessment as of December 31, 2022 and determined there was no indication of impairment related to intangible assets.

Earnings (Loss) Per Share ("EPS

Earnings (Loss) Per Share ("EPS")	9 Months Ended
Earnings (Loss) Per Share ("EPS")	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings (Loss) Per Share ("EPS")	Earnings (Loss) Per Share (“EPS”) Basic EPS represents income/(loss) allocable to common shareholders divided by the weighted-average number of common shares outstanding during the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common shares (such as stock options) were exercised or converted into additional common shares that would then share in the earnings of the Company. Diluted EPS is computed by dividing net income/(loss) allocable to common shareholders by the weighted-average number of common shares outstanding for the period, plus the effect of potential dilutive common share equivalents computed using the treasury stock method. Shares held by the Employee Stock Ownership Plan (“ESOP”) that have not been allocated to employees in accordance with the terms of the ESOP, referred to as “unallocated ESOP shares,” are not deemed outstanding for earnings per share calculations. For the Three Months Ended September 30, 2023 For the Nine Months Ended September 30, 2023 (Dollars in thousands, except per share data) Net income (loss) applicable to common shares: Net income (loss) from continuing operations $ 63,464 $ (94,198) Net (loss) income from discontinued operations (4,351) 7,872 Total net income (loss) $ 59,113 $ (86,326) Average number of common shares outstanding 175,832,085 175,783,313 Less: Average unallocated ESOP shares (13,461,616) (13,584,155) Average number of common shares outstanding used to calculate basic earnings (loss) per common share 162,370,469 162,199,158 Common stock equivalents 99,418 61,345 Average number of common shares outstanding used to calculate diluted earnings (loss) per common share 162,469,887 162,260,503 Basic earnings (loss) per common share: Earnings (loss) per share from continuing operations $ 0.39 $ (0.58) (Loss) earnings per share from discontinued operations (0.03) 0.05 Total basic earnings (loss) per share $ 0.36 $ (0.53) Diluted earnings (loss) per common share: Earnings (loss) per share from continuing operations $ 0.39 $ (0.58) (Loss) earnings per share from discontinued operations (0.03) 0.05 Total diluted earnings (loss) per share $ 0.36 $ (0.53) For the Three Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Dollars in thousands, except per share data) Net income applicable to common shares: Net income from continuing operations $ 52,808 $ 145,593 Net income from discontinued operations 1,969 11,872 Total net income $ 54,777 $ 157,465 Average number of common shares outstanding 177,677,074 180,764,479 Less: Average unallocated ESOP shares (13,958,112) (14,082,257) Average number of common shares outstanding used to calculate basic earnings per common share 163,718,962 166,682,222 Common stock equivalents 310,687 185,421 Average number of common shares outstanding used to calculate diluted earnings per common share 164,029,649 166,867,643 Basic earnings per common share: Earnings per share from continuing operations $ 0.32 $ 0.87 Earnings per share from discontinued operations 0.01 0.07 Total basic earnings per share $ 0.33 $ 0.94 Diluted earnings per common share: Earnings per share from continuing operations $ 0.32 $ 0.87 Earnings per share from discontinued operations 0.01 0.07 Total diluted earnings per share $ 0.33 $ 0.94

Low Income Housing Tax Credits

Low Income Housing Tax Credits and Other Tax Credit Investments	9 Months Ended
	Sep. 30, 2023
Investments in Affordable Housing Projects [Abstract]
Low Income Housing Tax Credits and Other Tax Credit Investments	Low Income Housing Tax Credits and Other Tax Credit Investments The Community Reinvestment Act (“CRA”) encourages banks to meet the credit needs of their communities for housing and other purposes, particularly in neighborhoods with low or moderate income. The Company has primarily invested in separate Low Income Housing Tax Credits (“LIHTC”) projects, also referred to as qualified affordable housing projects, which provide the Company with tax credits and operating loss tax benefits over a period of 15 years. The return on these investments is generally generated through tax credits and tax losses. In addition to LIHTC projects, the Company invests in new market tax credit projects that qualify for CRA credits and eligible projects that qualify for renewable energy and historic tax credits. As of September 30, 2023 and December 31, 2022, the Company had $226.8 million and $131.3 million, respectively, in tax credit investments that were included in other assets in the Company's Consolidated Balance Sheets. When permissible, the Company accounts for its investments in LIHTC projects using the proportional amortization method, under which it amortizes the initial cost of the investment in proportion to the amount of the tax credits and other tax benefits received and recognizes that amortization as a component of income tax expense. The net investment in the housing projects is included in other assets in the Company's Consolidated Balance Sheets. The Company will continue to use the proportional amortization method on any new qualifying LIHTC investments. The following table presents the Company’s investments in low income housing projects accounted for using the proportional amortization method for the periods indicated: As of September 30, 2023 As of December 31, 2022 (In thousands) Current recorded investment included in other assets $ 224,445 $ 128,765 Commitments to fund qualified affordable housing projects included in recorded investment noted above 159,230 84,145 The following table presents additional information related to the Company’s investments in LIHTC projects for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Tax credits and benefits recognized $ 1,602 $ 2,333 $ 8,169 $ 6,988 Amortization expense included in income tax (benefit) expense 745 1,886 6,322 5,616 The Company accounts for certain other investments in renewable energy projects using the equity method of accounting. These investments in renewable energy projects are included in other assets in the Company's Consolidated Balance Sheets and totaled $2.3 million and $2.6 million as of September 30, 2023 and December 31, 2022, respectively. There were no outstanding commitments related to these investments as of either September 30, 2023 or December 31, 2022.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
Shareholders' Equity	Sep. 30, 2023
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity Share Repurchases On November 12, 2021, the Company announced receipt of a notice of non-objection from the Board of Governors of the Federal Reserve System to its previously announced share repurchase program which was approved by the Company’s Board of Directors on October 1, 2021. The program authorized the purchase of up to 9,337,900 shares, or 5% of the Company’s then-outstanding shares of common stock over a 12-month period. The program was limited to $225.0 million through November 30, 2022. The Company completed the repurchase of the total number of shares authorized through this program during the third quarter of 2022. On September 7, 2022, the Company announced receipt of a notice of non-objection from the Board of Governors of the Federal Reserve System for a new share repurchase program. The program authorized the purchase of up to 8,900,000 shares, or 5% of the Company’s then-outstanding shares of common stock over a 12-month period. The program was limited to $200.0 million through August 31, 2023. This program expired during the three months ended September 30, 2023. During the nine months ended September 30, 2023, there were no share repurchases. During the three months ended September 30, 2022, the Company repurchased 1,481,248 shares at a weighted average price per share of $19.53. During the nine months ended September 30, 2022, the Company repurchased 8,564,338 shares at a weighted average price per share of $19.92. Dividends Information regarding dividends declared and paid is presented in the following table for the periods indicated: Dividends Declared per Share Dividends Declared Dividends Paid (In millions, except per share data) Three Months Ended March 31, 2023 $ 0.10 $ 16.3 $ 16.2 Three Months Ended June 30, 2023 0.10 16.4 16.3 Three Months Ended September 30, 2023 0.10 16.4 16.2 Three Months Ended March 31, 2022 $ 0.10 $ 17.1 $ 16.9 Three Months Ended June 30, 2022 0.10 16.7 16.5 Three Months Ended September 30, 2022 0.10 16.5 16.3

Employee Benefits

Employee Benefits	9 Months Ended
Employee Benefits	Sep. 30, 2023
Retirement Benefits [Abstract]
Employee Benefits	Employee Benefits Pension Plans The Company provides pension benefits for its employees through membership in the Savings Banks Employees’ Retirement Association. The plan through which benefits are provided is a noncontributory, qualified defined benefit plan and is referred to as the Defined Benefit Plan. The Company’s annual contribution to the Defined Benefit Plan is based upon standards established by the Pension Protection Act. The contribution is based on an actuarial method intended to provide not only for benefits attributable to service to date, but also for those expected to be earned in the future. The Defined Benefit Plan has a plan year end of October 31. The Company has an unfunded Defined Benefit Supplemental Executive Retirement Plan (“DB SERP”) that provides certain Company officers upon their retirement with defined pension benefits in excess of qualified plan limits imposed by U.S. federal tax law. The DB SERP has a plan year end of December 31. In addition, the Company has an unfunded Benefit Equalization Plan (“BEP”) to provide retirement benefits to certain employees whose retirement benefits under the qualified pension plan are limited per the Internal Revenue Code. The BEP has a plan year end of October 31. The Company also has an unfunded Outside Directors’ Retainer Continuance Plan (“ODRCP”) that provides pension benefits to outside directors who retire from service. The ODRCP has a plan year end of December 31. Effective December 31, 2020, the Company closed the ODRCP to new participants and froze benefit accruals for active participants. Components of Net Periodic Benefit Cost The components of net pension expense for the plans for the periods indicated are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Components of net periodic benefit cost: Service cost (1) $ 6,339 $ 8,094 $ 19,016 $ 24,278 Interest cost 4,297 2,429 12,893 7,289 Expected return on plan assets (7,532) (9,280) (22,596) (27,842) Prior service credit (2,970) (2,971) (8,910) (8,911) Recognized net actuarial loss 2,468 2,799 7,404 8,395 Net periodic benefit cost $ 2,602 $ 1,071 $ 7,807 $ 3,209 (1) Includes service costs related to employees of our insurance agency business. Such service costs were included in net (loss) income from discontinued operations as such costs will not continue to be incurred by the Company following the sale of the insurance agency business. All other costs included in the determination of the benefit obligation for the Defined Benefit Plan and the BEP were included in net income (loss) from continuing operations as the Bank will assume the related liability upon dissolution of Eastern Insurance Group following the sale of the insurance agency business. Service costs included in net (loss) income from discontinued operations and included in the above table were $1.5 million and $4.5 million for the three and nine months ended September 30, 2023, respectively, and were $1.9 million and $5.8 million for the three and nine months ended September 30, 2022, respectively. Except as described above, service costs for the Defined Benefit Plan and the BEP are recognized within salaries and employee benefits in the Consolidated Statements of Income. There were no service costs associated with the DB SERP or ODRCP during the three and nine months ended September 30, 2023 and September 30, 2022. The remaining components of net periodic benefit cost are recognized in other noninterest expense in the Consolidated Statements of Income. In accordance with the Pension Protection Act, the Company was not required to make any contributions to the Defined Benefit Plan for the plan years beginning November 1, 2022 and 2021. Accordingly, during the three and nine months ended September 30, 2023, there were no contributions made to the Defined Benefit Plan. During the three months ended September 30, 2022 there were no contributions made to the Defined Benefit Plan. The Company made discretionary contributions to the Defined Benefit Plan of $7.2 million during the nine months ended September 30, 2022. Rabbi Trust Variable Interest Entities The Company established rabbi trusts to meet its obligations under certain executive non-qualified retirement benefits and deferred compensation plans and to mitigate the expense volatility of the aforementioned retirement plans. The rabbi trusts are considered variable interest entities (“VIE”) as the equity investment at risk is insufficient to permit the trusts to finance their activities without additional subordinated financial support from the Company. The Company is considered the primary beneficiary of the rabbi trusts as it has the power to direct the activities of the rabbi trusts that significantly affect the rabbi trusts’ economic performance and it has the obligation to absorb losses of the rabbi trusts that could potentially be significant to the rabbi trusts by virtue of its contingent call options on the rabbi trusts’ assets in the event of the Company’s bankruptcy. As the primary beneficiary of these VIEs, the Company consolidates the rabbi trust investments. In general, the rabbi trust investments and any earnings received thereon are accumulated, reinvested and used exclusively for trust purposes. These rabbi trust investments consist primarily of cash and cash equivalents, U.S. government agency obligations, equity securities, mutual funds and other exchange-traded funds, and are recorded at fair value in other assets in the Company’s Consolidated Balance Sheets. Changes in fair value are recorded in noninterest income in the Company’s Consolidated Statements of Income. The following table presents the book value, mark-to-market, and fair value of assets held in rabbi trust accounts by asset type: As of September 30, 2023 As of December 31, 2022 Book Value Mark-to-Market Fair Value Book Value Mark-to-Market Fair Value Asset Type (In thousands) Cash and cash equivalents $ 11,420 $ — $ 11,420 $ 5,575 $ — $ 5,575 Equities (1) 55,838 6,822 62,660 60,056 3,626 63,682 Fixed income 6,863 (705) 6,158 7,799 (770) 7,029 Total assets $ 74,121 $ 6,117 $ 80,238 $ 73,430 $ 2,856 $ 76,286 (1) Equities include mutual funds and other exchange-traded funds.

Share-Based Compensation

Share-Based Compensation	9 Months Ended
Share-Based Compensation	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation Share-Based Compensation Plan On November 29, 2021, the shareholders of the Company approved the Eastern Bankshares, Inc. 2021 Equity Incentive Plan (the “2021 Plan”). The 2021 Plan provides for the issuance of up to 26,146,141 shares of common stock pursuant to grants of restricted stock, restricted stock units (“RSUs”), non-qualified stock options and incentive stock options, any or all of which can be granted with performance-based vesting conditions. Under the 2021 Plan, 7,470,326 shares may be issued as restricted stock or RSUs, including those issued as performance shares and performance share units (“PSUs”), and 18,675,815 shares may be issued upon the exercise of stock options. These shares may be awarded from the Company’s authorized but unissued shares. However, the 2021 Plan permits the grant of additional awards of restricted stock or RSUs above the aforementioned limit, provided that, for each additional share of restricted stock or RSU awarded in excess of such limit, the pool of shares available to be issued upon the exercise of stock options will be reduced by three shares. Pursuant to the terms of the 2021 Plan, each of the Company’s non-employee directors were automatically granted awards of restricted stock on November 30, 2021. Such restricted stock awards vest pro-rata on an annual basis over a five-year period. The maximum term for stock options is ten years. In May 2023, the Company granted a total of 47,820 shares of restricted stock to the Company’s non-employee directors which vest after approximately one year from the date of grant. In May 2022, the Company granted a total of 31,559 shares of restricted stock to the Company’s non-employee directors which vest after approximately one year from the date of grant. In March 2023, the Company granted to all of the Company’s executive officers and certain other employees a total of 318,577 RSUs, which vest pro-rata on an annual basis over a period of three years from the date of the grant, and a total of 108,984 PSUs for which vesting is contingent upon the Compensation and Human Capital Management Committee of the Board of Director’s certification, after the conclusion of a three-year period from the date of the grant, that the Company has attained a threshold level of certain performance criteria over such period. In March 2022, the Company granted to all of the Company’s executive officers and certain other employees a total of 978,364 RSUs, which vest pro-rata on an annual basis over a period of three As of September 30, 2023 and December 31, 2022, there were 4,830,074 shares and 5,302,256 shares that remained available for issuance as restricted stock or RSU awards (including those that may be issued as performance shares and PSUs), respectively, and 18,675,815 shares that remained available for issuance upon the exercise of stock options at both dates. As of both September 30, 2023 and December 31, 2022, no stock options had been awarded under the 2021 Plan. The following table summarizes the Company’s restricted stock award activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested restricted stock as of the beginning of the respective period 525,460 $ 20.08 683,056 $ 20.13 Granted 47,820 11.50 31,559 19.17 Vested (28,690) 19.17 — — Forfeited — — — — Non-vested restricted stock as of the end of the respective period 544,590 $ 19.37 714,615 $ 20.09 The following table summarizes the Company’s restricted stock unit activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested restricted stock units as of the beginning of the respective period 972,325 $ 21.08 — $ — Granted 318,577 15.63 978,364 21.08 Vested (1) (231,407) 21.08 — — Forfeited (3,199) 16.72 (6,039) 21.08 Non-vested restricted stock units as of the end of the respective period 1,056,296 $ 19.45 972,325 $ 21.08 (1) Includes 74,625 shares withheld upon settlement for employee taxes. The following table summarizes the Company’s performance stock unit activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested performance stock units as of the beginning of the respective period 533,676 $ 21.12 — $ — Granted 108,984 10.16 533,676 21.12 Vested — — — — Forfeited — — — — Non-vested performance stock units as of the end of the respective period 642,660 $ 19.26 533,676 $ 21.12 During the nine months ended September 30, 2023, 28,690 RSA awards vested. Such awards had a grant date fair value of $0.5 million. During the nine months ended September 30, 2022, no awards had vested. During the nine months ended September 30, 2023, 231,407 RSU awards vested. Such awards had a grant date fair value of $4.9 million. As of September 30, 2023, no PSU awards had vested. As of December 31, 2022, no RSU or PSU awards had vested. The following table shows share-based compensation expense under the 2021 Plan and the related tax benefit for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In millions) Share-based compensation expense $ 3.7 $ 3.6 $ 11.4 $ 8.1 Related tax benefit 1.0 1.0 3.2 2.3 As of September 30, 2023 and December 31, 2022, there was $32.6 million and $34.6 million, respectively, of total unrecognized compensation expense related to unvested restricted stock awards, restricted stock units and performance stock units granted and issued under the 2021 Plan, as applicable. As of September 30, 2023, this cost is expected to be recognized over a weighted average remaining period of approximately 2.5 years. As of December 31, 2022, this cost was expected to be recognized over a weighted average remaining period of approximately 3.3 years.

Income Taxes

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. The following table sets forth information regarding the Company’s tax provision and applicable tax rates for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in thousands) Combined federal and state income tax (benefit) provision $ (16,178) $ 16,650 $ (65,619) $ 43,681 Effective income tax rate (34.2) % 24.0 % 41.1 % 23.1 % The Company recorded a net income tax benefit of $16.2 million and $65.6 million for the three and nine months ended September 30, 2023, respectively, compared to net income tax expense of $16.7 million and $43.7 million for the three and nine months ended September 30, 2022, respectively. The Company established a $17.4 million valuation allowance in the first quarter of 2023 against the capital loss carryforward deferred tax asset which resulted from the sale of securities for the amount of deferred tax asset management believed was not more-likely-than-not to be realized. The income tax benefit for the three months ended September 30, 2023 was primarily due to the reversal of the remainder of the federal portion of the valuation allowance established in the first quarter of 2023. The amount reversed during the three months ended September 30, 2023 was $14.6 million. As a result of the execution of the agreement to sell the Company’s insurance agency business in September 2023 and the determination of the resulting capital gain, management determined it to be more-likely-than-not that the Company will realize federal capital losses related to the securities sale. Consequently, the Company reversed the associated federal valuation allowance previously established as management had determined it was more-likely-than-not that the entirety of the federal deferred tax asset related to the loss on such securities sales would be realized. In addition, the Company recognized an income tax benefit associated with a change in management’s estimate of annual pre-tax loss for purposes of determining the Company’s income tax provision. The income tax benefit for the nine months ended September 30, 2023 was primarily due to pretax losses which largely resulted from losses on sales of available for sale securities in the first quarter of 2023. In addition, during the first quarter of 2023, the Company liquidated Market Street Securities Corporation (“MSSC”), a wholly owned subsidiary, and transferred all of MSSC’s assets to Eastern Bank. In connection with the liquidation and subsequent transfer of securities previously held by MSSC to Eastern Bank, the Company recognized an additional deferred income tax benefit of $23.7 million during the first quarter of 2023. This deferred income tax benefit resulted from a state tax rate change applied to the deferred tax asset related to the securities transferred to Eastern Bank.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Financial Instruments with Off-Balance Sheet Risk In order to meet the financing needs of its customers and to reduce its own exposure to fluctuations in interest rates, the Company is party to financial instruments with off-balance sheet risk in the normal course of business. These financial instruments include commitments to extend credit, standby letters of credit, and forward commitments to sell loans, all of which involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the Consolidated Balance Sheets. The contract or notional amounts of those instruments reflect the extent of involvement the Company has in each particular class of financial instruments. Substantially all of the Company’s commitments to extend credit, which normally have fixed expiration dates or termination clauses, are contingent upon customers maintaining specific credit standards at the time of loan funding. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. For forward loan sale commitments, the contract or notional amount does not represent exposure to credit loss. The Company does not sell loans with recourse. The following table summarizes the above financial instruments as of the dates indicated: As of September 30, 2023 As of December 31, 2022 (In thousands) Commitments to extend credit $ 5,920,300 $ 5,680,438 Standby letters of credit 54,532 65,154 Forward commitments to sell loans 8,495 10,008 Other Contingencies The Company has been named a defendant in various legal proceedings arising in the normal course of business. In the opinion of management, based on the advice of legal counsel, the ultimate resolution of these proceedings will not have a material effect on the Company’s Consolidated Financial Statements.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
Derivative Financial Instruments	Sep. 30, 2023
Summary of Derivative Instruments [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company uses derivative financial instruments to manage its interest rate risk resulting from the differences in the amount, timing, and duration of known or expected cash receipts and known or expected cash payments. Additionally, the Company enters into interest rate derivatives and foreign exchange contracts to accommodate the business requirements of its customers (“customer-related positions”) and risk participation agreements entered into as financial guarantees of performance on customer-related interest rate swap derivatives. The Company also enters into residential mortgage loan commitments to fund mortgage loans at specified rates and times in the future and enters into forward sale commitments to sell such residential mortgage loans at specified prices and times in the future, both of which are considered derivative instruments. Derivative instruments are carried at fair value in the Company’s Consolidated Financial Statements. The accounting for changes in the fair value of a derivative instrument is dependent upon whether or not the instrument qualifies as a hedge for accounting purposes, and further, by the type of hedging relationship. By using derivatives, the Company is exposed to credit risk to the extent that counterparties to the derivative contracts do not perform as required. Should a counterparty fail to perform under the terms of a derivative contract, the Company’s credit exposure on interest rate swaps is limited to the net positive fair value and accrued interest of all swaps with each counterparty plus any initial margin collateral posted. The Company seeks to minimize counterparty credit risk through credit approvals, limits, monitoring procedures, and obtaining collateral, where appropriate. As such, management believes the risk of incurring credit losses on derivative contracts with those counterparties is remote. The Company’s discounting methodology and interest calculation of cash margin uses the Secured Overnight Financing Rate, or SOFR, for U.S. dollar cleared interest rate swaps. Interest Rate Positions An interest rate swap is an agreement whereby one party agrees to pay a floating rate of interest on a notional principal amount in exchange for receiving a fixed rate of interest on the same notional amount, for a predetermined period of time, from a second party. The amounts relating to the notional principal amount are not actually exchanged. The Company has entered into interest rate swaps in which it pays floating and receives fixed interest in order to manage its interest rate risk exposure to the variability in interest cash flows on certain floating-rate loans. Such interest rate swaps include those which effectively convert the floating rate one-month SOFR or overnight indexed swap rate, or prime rate interest payments received on the loans to a fixed rate and consequently reduce the Company’s exposure to variability in short-term interest rates. For interest rate swaps that are accounted for as cash flow hedges, changes in fair value are included in other comprehensive income and reclassified into net income in the same period or periods during which the hedged forecasted transaction affects net income. The following tables reflect the Company’s derivative positions for interest rate swaps which qualify as cash flow hedges for accounting purposes as of the dates indicated: As of September 30, 2023 Weighted Average Rate Notional Weighted Average Current Receive Fixed Fair Value (1) (In thousands) (In Years) (In thousands) Interest rate swaps on loans $ 2,400,000 3.82 5.32 % 3.02 % $ (351) Total $ 2,400,000 $ (351) (1) The fair value included a net accrued interest payable balance of $2.5 million as of September 30, 2023. In addition, the fair value includes netting adjustments which represent the amounts recorded to convert derivative assets and liabilities cleared through the Chicago Mercantile Exchange, or CME, from a gross basis to a net basis in accordance with applicable accounting guidance. As of December 31, 2022 Weighted Average Rate Notional Weighted Average Current Receive Fixed Fair Value (1) (In thousands) (In Years) (In thousands) Interest rate swaps on loans $ 2,400,000 4.57 4.07 % 3.02 % $ (2,401) Total $ 2,400,000 $ (2,401) (1) The fair value included a net accrued interest payable balance of $1.5 million as of December 31, 2022. In addition, the fair value includes netting adjustments which represent the amounts recorded to convert derivative assets and liabilities cleared through the CME from a gross basis to a net basis in accordance with applicable accounting guidance. The maximum amount of time over which the Company is currently hedging its exposure to the variability in future cash flows of forecasted transactions related to the receipt of variable interest on existing financial instruments is 4 years. The Company expects approximately $54.1 million will be reclassified into interest income, as a reduction of such income, from other comprehensive income related to the Company’s active cash flow hedges in the next 12 months as of September 30, 2023. The reclassification is due to anticipated net payments on the swaps based upon the forward curve as of September 30, 2023. The Company discontinues cash flow hedge accounting if it is probable the forecasted hedged transactions will not occur in the initially identified time period. At such time, the associated gains and losses deferred in accumulated other comprehensive income (“AOCI”) are reclassified immediately into earnings and any subsequent changes in the fair value of such derivatives are recognized directly in earnings. The following table presents the pre-tax impact of terminated cash flow hedges on AOCI for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Unrealized gains on terminated hedges included in AOCI – beginning of respective period $ — $ 1,850 $ 46 $ 10,239 Unrealized gains on terminated hedges arising during the period — — — — Reclassification adjustments for amortization of unrealized gains into net income — (1,263) (46) (9,652) Unrealized gains on terminated hedges included in AOCI – end of respective period $ — $ 587 $ — $ 587 Customer-Related Positions Interest rate swaps offered to commercial customers do not qualify as hedges for accounting purposes. These swaps allow the Company to retain variable rate commercial loans while allowing the commercial customer to synthetically fix the loan rate by entering into a variable-to-fixed rate interest rate swap. The Company believes that its exposure to commercial customer derivatives is limited to non-performance by either the customer or the dealer because these contracts are simultaneously matched at inception with an offsetting transaction. Risk participation agreements are entered into as financial guarantees of performance on interest rate swap derivatives. The purchased (asset) or sold (liability) guarantee allow the Company to participate-out (fee paid) or participate-in (fee received) the risk associated with certain derivative positions executed with the borrower by the lead bank in a customer-related interest rate swap derivative. Foreign exchange contracts consist of those offered to commercial customers and those entered into to hedge the Company’s foreign currency risk associated with a foreign-currency loan. Neither qualifies as a hedge for accounting purposes. These commercial customer derivatives are offset with matching derivatives with correspondent-bank counterparties in order to minimize foreign exchange rate risk to the Company. Exposure with respect to these derivatives is largely limited to non-performance by either the customer or the other counterparty. Neither the Company nor the correspondent-bank counterparty are required to post collateral but each has established foreign-currency transaction limits to manage the exposure risk. The Company requires its customers to post collateral to minimize risk exposure. The following tables present the Company’s customer-related derivative positions as of the dates indicated below for those derivatives not designated as hedging: September 30, 2023 Number of Positions Total Notional (Dollars in thousands) Interest rate swaps 376 $ 2,478,858 Risk participation agreements 73 267,812 Foreign exchange contracts: Matched commercial customer book 92 45,145 Foreign currency loan 6 11,553 December 31, 2022 Number of Positions Total Notional (Dollars in thousands) Interest rate swaps 382 $ 2,404,003 Risk participation agreements 63 241,029 Foreign exchange contracts: Matched commercial customer book 32 7,877 Foreign currency loan 5 13,948 The level of interest rate swaps, risk participation agreements and foreign currency exchange contracts at the end of each period noted above was commensurate with the activity throughout those periods. The table below presents the fair value of the Company’s derivative financial instruments, as well as their classification on the Consolidated Balance Sheets for the periods indicated: Asset Derivatives Liability Derivatives Balance Fair Value at September 30, Fair Value at December 31, Balance Sheet Fair Value at September 30, Fair Value at December 31, (In thousands) Derivatives designated as hedging instruments Interest rate swaps Other assets $ 15 $ 16 Other liabilities $ 367 $ 2,417 Derivatives not designated as hedging instruments Customer-related positions: Interest rate swaps Other assets $ 25,236 $ 23,567 Other liabilities $ 92,409 $ 78,577 Risk participation agreements Other assets 47 78 Other liabilities 45 130 Foreign currency exchange contracts - matched customer book Other assets 785 198 Other liabilities 763 205 Foreign currency exchange contracts - foreign currency loan Other assets 261 2 Other liabilities 1 93 $ 26,329 $ 23,845 $ 93,218 $ 79,005 Total $ 26,344 $ 23,861 $ 93,585 $ 81,422 The table below presents the net effect of the Company’s derivative financial instruments on the Consolidated Income Statements as well as the effect of the Company’s derivative financial instruments included in other comprehensive income (“OCI”) as follows: Three Months Ended Nine Months Ended 2023 2022 2023 2022 (In thousands) Derivatives designated as hedges: Loss in OCI on derivatives $ (29,022) $ (72,667) $ (66,168) $ (71,182) (Loss) gain reclassified from OCI into interest income (effective portion) $ (13,723) $ 3,755 $ (34,557) $ 12,797 Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test) Interest income — — — — Other income — — — — Total $ — $ — $ — $ — Derivatives not designated as hedges: Customer-related positions: Gain recognized in interest rate swap income $ 910 $ 1,035 $ 770 $ 4,760 Gain recognized in interest rate swap income for risk participation agreements 25 38 54 186 Gain (loss) recognized in other income for foreign currency exchange contracts: Matched commercial customer book 9 (1) 29 (1) Foreign currency loan 503 (136) 351 9 Total gain for derivatives not designated as hedges $ 1,447 $ 936 $ 1,204 $ 4,954 The Company has agreements with its customer-related interest rate swap derivative counterparties that contain a provision whereby if the Company defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Company could also be declared in default on its derivative obligations. The Company also has agreements with certain of its customer-related interest rate swap derivative correspondent-bank counterparties that contain a provision whereby if the Company fails to maintain its status as a well-capitalized institution, then the counterparty could terminate the derivative positions and the Company would be required to settle its obligations under the agreements. The Company’s exposure related to its customer-related interest rate swap derivatives consists of exposure on cleared derivative transactions and exposure on non-cleared derivative transactions. Cleared derivative transactions are with the Chicago Mercantile Exchange, or CME, and exposure is settled to market daily, with additional credit exposure related to initial-margin collateral pledged to CME at trade execution. At September 30, 2023, the Company had exposure to CME for settled variation margin in excess of the customer-related and non-customer-related interest rate swap termination values of $0.1 million. At December 31, 2022, the Company had no exposure to CME for settled variation margin in excess of the customer-related and non-customer-related interest rate swap termination values. In addition, at September 30, 2023 and December 31, 2022, the Company had posted initial-margin collateral in the form of U.S. Treasury notes amounting to $84.2 million and $84.1 million, respectively, to CME for these derivatives. The U.S. Treasury notes were considered restricted assets and were included in available for sale securities within the Company’s Consolidated Balance Sheets. At both September 30, 2023 and December 31, 2022, there were no customer-related interest rate swap derivatives with credit-risk contingent features in a net liability position. The Company has minimum collateral posting thresholds with its customer-related interest rate swap derivative correspondent-bank counterparties to the extent that the Company has a liability position with the correspondent-bank counterparties. At both September 30, 2023 and December 31, 2022, the Company had posted collateral in the form of cash amounting to $1.0 million, which was considered to be a restricted asset and was included in other short-term investments within the Company’s Consolidated Balance Sheets. If the Company had breached any of these provisions at September 30, 2023 or December 31, 2022, it would have been required to settle its obligations under the agreements at the termination value. In addition, the Company had cross-default provisions with its commercial customer loan agreements which provide cross-collateralization with the customer loan collateral. Mortgage Banking Derivatives The Company enters into residential mortgage loan commitments in connection with its consumer mortgage banking activities to fund mortgage loans at specified rates and times in the future. In addition, the Company enters into forward sale commitments to sell such residential mortgage loans at specified prices and times in the future. These commitments are short-term in nature and generally expire in 30 to 60 days. The residential mortgage loan commitments that relate to the origination of mortgage loans that will be held for sale and the related forward sale commitments are considered derivative instruments under ASC Topic 815, “Derivatives and Hedging” and are reported at fair value. Changes in fair value are reported in earnings and included in other non-interest income on the Consolidated Statements of Income. As of September 30, 2023 and December 31, 2022, the Company had an outstanding notional balance of residential mortgage loan origination commitments of $12.2 million and $8.3 million, respectively, and forward sale commitments of $8.5 million and $10.0 million, respectively. During both the three months ended September 30, 2023 and September 30, 2022, the Company recorded net losses related to the change in fair value of commitments to originate and sell mortgage loans of less than $0.1 million. During the nine months ended September 30, 2023 and September 30, 2022, the Company recorded net losses related to the change in fair value of commitments to originate and sell mortgage loans of $0.1 million and $0.2 million, respectively. The aggregate fair value of both the Company’s mortgage banking derivative asset and liability as of both September 30, 2023 and December 31, 2022 was $0.1 million. Mortgage banking derivative assets and liabilities are included in other assets and other liabilities, respectively, in the Consolidated Balance Sheets. Residential mortgages sold are generally sold with servicing rights released. Mortgage banking derivatives do not qualify as hedges for accounting purposes.

Balance Sheet Offsetting

Balance Sheet Offsetting	9 Months Ended
Balance Sheet Offsetting	Sep. 30, 2023
Offsetting [Abstract]
Balance Sheet Offsetting	Balance Sheet OffsettingCertain financial instruments, including derivatives, may be eligible for offset in the Consolidated Balance Sheets and/or subject to master netting arrangements or similar agreements. The Company’s derivative transactions with upstream financial institution counterparties are generally executed under International Swaps and Derivative Association master agreements which include “right of set-off” provisions. In such cases there is generally a legally enforceable right to offset recognized amounts. However, the Company does not offset fair value amounts recognized for derivative instruments. The Company nets the amount recognized for the right to reclaim cash collateral against the obligation to return cash collateral arising from derivative instruments executed with the same counterparty under a master netting arrangement. Collateral legally required to be maintained at dealer banks by the Company is monitored and adjusted as necessary. As of September 30, 2023 and December 31, 2022, it was determined that no additional collateral would have to be posted to immediately settle these instruments. The following tables present the Company’s asset and liability positions that were eligible for offset and the potential effect of netting arrangements on its Consolidated Balance Sheet, as of the dates indicated: As of September 30, 2023 Gross Gross Net Gross Amounts Not Offset Net Description Financial Collateral (In thousands) Derivative Assets Interest rate swaps $ 15 $ — $ 15 $ — $ — $ 15 Customer-related positions: Interest rate swaps 25,236 — 25,236 321 (16,900) 8,015 Risk participation agreements 47 — 47 — — 47 Foreign currency exchange contracts – matched customer book 785 — 785 — — 785 Foreign currency exchange contracts – foreign currency loan 261 — 261 — — 261 $ 26,344 $ — $ 26,344 $ 321 $ (16,900) $ 9,123 Derivative Liabilities Interest rate swaps $ 367 $ — $ 367 $ — $ 367 $ — Customer-related positions: Interest rate swaps 92,409 — 92,409 321 — 92,088 Risk participation agreements 45 — 45 — — 45 Foreign currency exchange contracts – matched customer book 763 — 763 — — 763 Foreign currency exchange contracts – foreign currency loan 1 — 1 — — 1 $ 93,585 $ — $ 93,585 $ 321 $ 367 $ 92,897 As of December 31, 2022 Gross Gross Net Gross Amounts Not Offset Net Description Financial Collateral (In thousands) Derivative Assets Interest rate swaps $ 16 $ — $ 16 $ — $ — $ 16 Customer-related positions: Interest rate swaps 23,567 — 23,567 381 (14,430) 8,756 Risk participation agreements 78 — 78 — — 78 Foreign currency exchange contracts – matched customer book 198 — 198 — — 198 Foreign currency exchange contracts – foreign currency loan 2 — 2 — — 2 $ 23,861 $ — $ 23,861 $ 381 $ (14,430) $ 9,050 Derivative Liabilities Interest rate swaps $ 2,417 $ — $ 2,417 $ — $ 2,417 $ — Customer-related positions: Interest rate swaps 78,577 — 78,577 381 — 78,196 Risk participation agreements 130 — 130 — — 130 Foreign currency exchange contracts – matched customer book 205 — 205 — — 205 Foreign currency exchange contracts – foreign currency loan 93 — 93 — — 93 $ 81,422 $ — $ 81,422 $ 381 $ 2,417 $ 78,624

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
Fair Value of Assets and Liabilities	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities ASC 820 “ Fair Value Measurements and Disclosures ” (“ASC 820”) defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date. Market participants are buyers and sellers in the principal market that are independent, knowledgeable, able and willing to transact. ASC 820 also establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements), and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below: Level 1 – Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 – Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly. Level 3 – Prices or valuations that require unobservable inputs that reflect the Company’s own assumptions that are significant to the fair value measurement. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The Company uses fair value measurements to record adjustments to certain assets and liabilities and to determine fair value disclosures. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company’s various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. Fair value is a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. Therefore, even when market assumptions are not readily available, the Company’s own assumptions are set to reflect those that the Company believes market participants would use in pricing the asset or liability at the measurement date. The Company uses prices and inputs that are current as of the measurement date, including during periods of market dislocation. In periods of market dislocation, the observability of prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified from Level 1 to Level 2 or from Level 2 to Level 3. Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no active market exists for a portion of the Company’s financial instruments, fair value estimates are based on judgements regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgement, and therefore cannot be determined with precision. Changes in assumptions could significantly affect these estimates. The following methods and assumptions were used by the Company in estimating fair value disclosures: Cash and Cash Equivalents For these financial instruments, which have original maturities of 90 days or less, their carrying amounts reported in the Consolidated Balance Sheets approximate fair value. Securities Securities consisted of U.S. Treasury securities, U.S. Agency bonds, U.S. government-sponsored residential and commercial mortgage-backed securities, state and municipal bonds, and other debt securities. AFS securities are recorded at fair value. The Company’s U.S. Treasury securities are traded on active markets and therefore these securities were classified as Level 1. The fair value of U.S. Agency bonds were evaluated using relevant trade data, benchmark quotes and spreads obtained from publicly available trade data, and generated on a price, yield or spread basis as determined by the observed market data. Therefore, these securities were categorized as Level 2 given the use of observable inputs. The fair value of U.S. government-sponsored residential and commercial mortgage-backed securities were estimated using either a matrix or benchmarks. The inputs used include benchmark yields, reported trades, broker/dealer quotes, and issuer spreads. Therefore, these securities were categorized as Level 2 given the use of observable inputs. The fair value of state and municipal bonds were estimated using a valuation matrix with inputs including observable bond interest rate tables, recent transactions, and yield relationships. Therefore, these securities were categorized as Level 2 given the use of observable inputs. The fair value of other debt securities, which were held at December 31, 2022 and had matured as of September 30, 2023, were estimated using a valuation matrix with inputs including observable bond interest rate tables, recent transactions, and yield relationships. Therefore, these securities were categorized as Level 2 given the use of observable inputs. Fair value was based on the value of one unit without regard to any premium or discount that may result from concentrations of ownership of a financial instrument, possible tax ramifications, or estimated transaction costs. Loans Held for Sale The fair value of loans held for sale, whose carrying amounts approximate fair value, was estimated using the anticipated market price based upon pricing indications provided by investor banks. These assets were classified as Level 2 given the use of observable inputs. Loans The fair value of commercial construction, commercial and industrial lines of credit, and certain other consumer loans was estimated by discounting the contractual cash flows using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. For commercial, commercial real estate, residential real estate, automobile, and consumer home equity loans, fair value was estimated by discounting contractual cash flows adjusted for prepayment estimates using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Loans are classified as Level 3 since the valuation methodology utilizes significant unobservable inputs. Loans that are deemed to be collateral-dependent, as described in Note 2, “Summary of Significant Accounting Policies” within the Notes to the Consolidated Financial Statements included within the Company’s 2022 Form 10-K, were recorded at the fair value of the underlying collateral. FHLB Stock The fair value of FHLB stock approximates the carrying amount based on the redemption provisions of the FHLB. These assets were classified as Level 2. Rabbi Trust Investments Rabbi trust investments consisted primarily of cash and cash equivalents, U.S. government agency obligations, equity securities, mutual funds and other exchange-traded funds, and were recorded at fair value and included in other assets. The purpose of these rabbi trust investments is to fund certain executive non-qualified retirement benefits and deferred compensation. The fair value of other U.S. government agency obligations was estimated using either a matrix or benchmarks. The inputs used include benchmark yields, reported trades, broker/dealer quotes, and issuer spreads. These securities were categorized as Level 2 given the use of observable inputs. The equity securities, mutual funds and other exchange-traded funds were valued based on quoted prices from the market. The equities, mutual funds and exchange-traded funds traded in an active market were categorized as Level 1 as they were valued based upon quoted prices from the market. Mutual funds at net asset value amounted to $44.2 million at September 30, 2023 and $38.9 million at December 31, 2022. There were no redemption restrictions on these mutual funds at the end of any period presented. Bank-Owned Life Insurance The fair value of bank-owned life insurance was based upon quotations received from bank-owned life insurance dealers. These assets were classified as Level 2 given the use of observable inputs. Deposits The fair value of deposits with no stated maturity, such as noninterest-bearing demand deposits, savings, interest checking accounts, and money market accounts, was equal to their carrying amount. The fair value of time deposits was based on the discounted value of contractual cash flows using current market interest rates. Deposits were classified as Level 2 given the use of observable market inputs. The fair value estimates of deposits do not include the benefit that results from the low-cost funding provided by the deposit liabilities compared to the cost of borrowing funds in the wholesale market (core deposit intangibles). FHLB Advances The fair value of FHLB advances was based on the discounted value of contractual cash flows. The discount rates used are representative of approximate rates currently offered on instruments with similar remaining maturities. FHLB advances were classified as Level 2. Escrow Deposits of Borrowers The fair value of escrow deposits of borrowers, which have no stated maturity, approximates the carrying amount. Escrow deposits of borrowers were classified as Level 2. Interest Rate Swap Collateral Funds The fair value of interest rate swap collateral funds approximates the carrying amount. Interest rate swap collateral funds were classified as Level 2. Interest Rate Swaps The fair value of interest rate swaps was determined using discounted cash flow analysis on the expected cash flows of the interest rate swaps. This analysis reflects the contractual terms of the interest rate swaps, including the period of maturity, and uses observable market-based inputs, including interest rate curves and implied volatility. In addition, for customer-related interest rate swaps, the analysis reflects a credit valuation adjustment to reflect the Company’s own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. The majority of inputs used to value the Company’s interest rate swaps fall within Level 2 of the fair value hierarchy, but the credit valuation adjustments associated with the interest rate swaps utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. However, at September 30, 2023 and December 31, 2022, the impact of the Level 3 inputs on the overall valuation of the interest rate swaps was deemed insignificant to the overall valuation. As a result, the interest rate swaps were categorized as Level 2 within the fair value hierarchy. Risk Participations The fair value of risk participations was determined based upon the total expected exposure of the derivative which considers the present value of cash flows discounted using market-based inputs and were therefore categorized as Level 2 within the fair value hierarchy. The fair value also included a credit valuation adjustment which evaluates the credit risk of the counterparties by considering factors such as the likelihood of default by the counterparties, its net exposures, the remaining contractual life, as well as the amount of collateral securing the position. The change in value of derivative assets and liabilities attributable to credit risk was not significant during the reported periods. Foreign Currency Forward Contracts The fair values of foreign currency forward contracts were based upon the remaining expiration period of the contracts and bid quotations received from foreign exchange contract dealers and were categorized as Level 2 within the fair value hierarchy. Mortgage Derivatives The fair value of mortgage derivatives is determined based upon current market prices for similar assets in the secondary market and, therefore are classified as Level 2 within the fair value hierarchy. Fair Value of Assets and Liabilities Measured on a Recurring Basis The following tables present the balances of assets and liabilities measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022: Fair Value Measurements at Reporting Date Using Balance as of September 30, 2023 Quoted Prices in Significant Significant Description (In thousands) Assets Securities available for sale Government-sponsored residential mortgage-backed securities $ 2,700,630 $ — $ 2,700,630 $ — Government-sponsored commercial mortgage-backed securities 1,089,120 — 1,089,120 — U.S. Agency bonds 207,965 — 207,965 — U.S. Treasury securities 93,219 93,219 — — State and municipal bonds and obligations 170,584 — 170,584 — Rabbi trust investments 80,238 74,080 6,158 — Loans held for sale 23,892 — 23,892 — Interest rate swap contracts Cash flow hedges - interest rate positions 15 — 15 — Customer-related positions 25,236 — 25,236 — Risk participation agreements 47 — 47 — Foreign currency forward contracts Matched customer book 785 — 785 — Foreign currency loan 261 — 261 — Mortgage derivatives 68 — 68 — Total $ 4,392,060 $ 167,299 $ 4,224,761 $ — Liabilities Interest rate swap contracts Cash flow hedges - interest rate positions $ 367 $ — $ 367 $ — Customer-related positions 92,409 — 92,409 — Risk participation agreements 45 — 45 — Foreign currency forward contracts Matched customer book 763 — 763 — Foreign currency loan 1 — 1 — Mortgage derivatives 118 — 118 — Total $ 93,703 $ — $ 93,703 $ — Fair Value Measurements at Reporting Date Using Description Balance as of December 31, 2022 Quoted Prices in Significant Significant (In thousands) Assets Securities available for sale Government-sponsored residential mortgage-backed securities $ 4,111,908 $ — $ 4,111,908 $ — Government-sponsored commercial mortgage-backed securities 1,348,954 — 1,348,954 — U.S. Agency bonds 952,482 — 952,482 — U.S. Treasury securities 93,057 93,057 — — State and municipal bonds and obligations 183,092 — 183,092 — Other debt securities 1,285 — 1,285 — Rabbi trust investments 76,286 69,257 7,029 — Loans held for sale 4,543 — 4,543 — Interest rate swap contracts Cash flow hedges - interest rate positions 16 — 16 — Customer-related positions 23,567 — 23,567 — Risk participation agreements 78 — 78 — Foreign currency forward contracts Matched customer book 198 — 198 — Foreign currency loan 2 — 2 — Mortgage derivatives 62 — 62 — Total $ 6,795,530 $ 162,314 $ 6,633,216 $ — Liabilities Interest rate swap contracts Cash flow hedges - interest rate positions $ 2,417 $ — $ 2,417 $ — Customer-related positions 78,577 — 78,577 — Risk participation agreements 130 — 130 — Foreign currency forward contracts Matched customer book 205 — 205 — Foreign currency loan 93 — 93 — Mortgage derivatives 58 — 58 — Total $ 81,480 $ — $ 81,480 $ — There were no transfers to or from Level 1, 2 and 3 during the nine months ended September 30, 2023 and twelve months ended December 31, 2022. The Company held no assets or liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of September 30, 2023 or December 31, 2022. Fair Value of Assets and Liabilities Measured on a Nonrecurring Basis The Company may also be required, from time to time, to measure certain other assets and liabilities on a nonrecurring basis in accordance with generally accepted accounting principles. The following tables summarize the fair value of assets and liabilities measured at fair value on a nonrecurring basis, as of September 30, 2023 and December 31, 2022. Fair Value Measurements at Reporting Date Using Description Balance as of September 30, 2023 Quoted Prices Significant Significant (In thousands) Assets Individually assessed collateral-dependent loans whose fair value is based upon appraisals $ 18,105 $ — $ — $ 18,105 Fair Value Measurements at Reporting Date Using Description Balance as of December 31, 2022 Quoted Prices Significant Significant (In thousands) Assets Collateral-dependent impaired loans whose fair value is based upon appraisals $ 16,432 $ — $ — $ 16,432 For the valuation of the collateral-dependent loans, the Company relies primarily on third-party valuation information from certified appraisers and values are generally based upon recent appraisals of the underlying collateral, brokers’ opinions based upon recent sales of comparable properties, estimated equipment auction or liquidation values, income capitalization, or a combination of income capitalization and comparable sales. Depending on the type of underlying collateral, valuations may be adjusted by management for qualitative factors such as economic factors and estimated liquidation expenses. The range of these possible adjustments may vary. Disclosures about Fair Value of Financial Instruments The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated: Fair Value Measurements at Reporting Date Using Description Carrying Value as of September 30, 2023 Fair Value as of September 30, 2023 Quoted Prices Significant Significant (In thousands) Assets Held to maturity securities: Government-sponsored residential mortgage-backed securities $ 260,271 $ 219,548 $ — $ 219,548 $ — Government-sponsored commercial mortgage-backed securities 195,629 168,106 — 168,106 — Loans, net of allowance for loan losses 13,744,822 13,099,665 — — 13,099,665 FHLB stock 37,125 37,125 — 37,125 — Bank-owned life insurance 163,700 163,700 — 163,700 — Liabilities Deposits $ 17,424,169 $ 17,412,731 $ — $ 17,412,731 $ — FHLB advances 673,525 670,747 — 670,747 — Escrow deposits of borrowers 24,947 24,947 — 24,947 — Interest rate swap collateral funds 16,900 16,900 — 16,900 — Fair Value Measurements at Reporting Date Using Description Carrying Value as of December 31, 2022 Fair Value as of December 31, 2022 Quoted Prices Significant Significant (In thousands) Assets Held to maturity securities: Government-sponsored residential mortgage-backed securities $ 276,493 $ 246,343 $ — $ 246,343 $ — Government-sponsored commercial mortgage-backed securities 200,154 176,883 — 176,883 — Loans, net of allowance for loan losses 13,420,317 13,149,096 — — 13,149,096 FHLB stock 41,363 41,363 — 41,363 — Bank-owned life insurance 160,790 160,790 — 160,790 — Liabilities Deposits $ 18,974,359 $ 18,960,407 $ — $ 18,960,407 $ — FHLB advances 704,084 702,954 — 702,954 — Escrow deposits of borrowers 22,314 22,314 — 22,314 — Interest rate swap collateral funds 14,430 14,430 — 14,430 — This summary excludes certain financial assets and liabilities for which the carrying value approximates fair value. For financial assets, these may include cash and due from banks, federal funds sold and short-term investments. For financial liabilities, these may include federal funds purchased. These instruments would all be considered to be classified as Level 1 within the fair value hierarchy. Also excluded from the summary are financial instruments measured at fair value on a recurring and nonrecurring basis, as previously described.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
Revenue from Contracts with Customers	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers Revenue from contracts with customers within the scope of ASC 606, Revenue from Contracts with Customers (Topic 606) (“ASC 606”) is recognized when control of goods or services is transferred to the customer, in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The Company considers the terms of the contract and all relevant facts and circumstances when applying this guidance. The Company measures revenue and timing of recognition by applying the following five steps: 1. Identify the contract(s) with the customers 2. Identify the performance obligations 3. Determine the transaction price 4. Allocate the transaction price to the performance obligations 5. Recognize revenue when (or as) the entity satisfies a performance obligation The Company accounts for a contract when it has approval and commitment from both parties, the rights of the parties are identified, payment terms are identified, the contract has commercial substance and collectability of consideration is probable. The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. Performance obligations The Company’s performance obligations are generally satisfied either at a point in time or over time, as services are rendered. Unsatisfied performance obligations at the report date are not material to the Company’s Consolidated Financial Statements. A portion of the Company's noninterest income/(loss) is derived from contracts with customers within the scope of ASC 606. The Company has disaggregated such revenues by type of service, as presented in the table below. These categories reflect how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Service charges on deposit accounts $ 7,403 $ 6,708 $ 21,117 $ 23,558 Trust and investment advisory fees 6,235 5,832 18,136 17,967 Debit card processing fees 3,388 3,249 10,071 9,417 Other noninterest income 2,548 2,728 7,723 8,067 Total noninterest income in-scope of ASC 606 19,574 18,517 57,047 59,009 Total noninterest (loss) income out-of-scope of ASC 606 (417) 1,007 (321,539) (4,684) Total noninterest income (loss) $ 19,157 $ 19,524 $ (264,492) $ 54,325 Additional information related to each of the revenue streams is further noted below. Deposit Service Charges The Company offers various deposit account products to its customers governed by specific deposit agreements applicable to either personal customers or business customers. These agreements identify the general conditions and obligations of both parties and include standard information regarding deposit account-related fees. Deposit account services include providing access to deposit accounts as well as access to the various deposit transactional services of the Company. These transactional services are primarily those that are identified in the standard fee schedule, and include, but are not limited to, services such as overdraft protection, wire transfer, and check collection. The Company may charge monthly fixed service fees associated with the customer having access to the deposit account as well as separate fixed fees associated with and at the time specific transactions are entered into by the customer. As such, the Company considers that its performance obligations are fulfilled when customers are provided deposit account access or when the requested deposit transaction is completed. Cash management services are a subset of the deposit service charges revenue stream. These services include automated clearing house, or ACH, transaction processing, positive pay, lockbox, and remote deposit services. These services are also governed by separate agreements entered into by the customer. The fee arrangement for these services is structured as a fixed fee per transaction which may be offset by earnings credits. An earnings credit is a discount that a customer receives based upon the investable balance in the applicable covered deposit account(s) for a given month. Earnings credits are only good for the given month. That is, if cash management fees for a given month are less than the month’s earnings credit, the remainder of the credit does not carry over to the following month. Cash management fees are recognized as revenue in the month that the services are provided. Cash management fees earned but not yet received amounted to $1.7 million and $2.1 million as of September 30, 2023 and December 31, 2022 and were included in other assets. Trust and Investment Advisory Fees The Company offers investment management and trust services to individuals, institutions, small businesses and charitable institutions. Each investment management product is governed by its own contract along with a separate identifiable fee schedule unique to that product. The Company also offers additional services, such as estate settlement, financial planning, tax services, and other special services quoted at the customer’s request. The asset management and/or custody fees are primarily based upon a percentage of the monthly valuation of the principal assets in the customer’s account. Customers are also charged a base fee which is prorated over a twelve-month period. Fees for additional or special services are generally fixed in nature and are charged as services are rendered. All revenue is recognized in correlation to the monthly management fee determinations or as transactional services are provided. Debit Card Processing Fees The Company provides debit cards to its customers which are authorized and settled through various card payment networks, and in exchange, the Company earns revenue as determined by each payment network’s interchange program. Regardless of the network that is utilized to authorize and settle the payment, the merchant that provides the product or service to the debit card holder is ultimately responsible for the interchange payment to the Company. Debit card processing fees are recognized as card transactions are settled within each network. Debit card processing fees earned but not yet received amounted to $0.3 million as of both September 30, 2023 and December 31, 2022 and were included in other assets. Other Noninterest Income The Company earns various types of other noninterest income that have been aggregated into one general revenue stream in the table noted above. Noninterest income includes, but is not limited to, the following types of revenue with customers: safe deposit rent, ATM surcharge fees and customer checkbook fees. Individually, these sources of noninterest income are not material.

Other Comprehensive Income

Other Comprehensive Income	9 Months Ended
Other Comprehensive Income	Sep. 30, 2023
Statement of Other Comprehensive Income [Abstract]
Other Comprehensive Income	Other Comprehensive Income The following tables present a reconciliation of the changes in the components of other comprehensive (loss) income for the dates indicated including the amount of income tax (expense) benefit allocated to each component of other comprehensive (loss) income: Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Pre Tax Tax After Tax Pre Tax Tax After Tax (In thousands) Unrealized losses on securities available for sale: Change in fair value of securities available for sale $ (157,750) $ 40,490 $ (117,260) $ (194,259) $ 52,004 $ (142,255) Less: reclassification adjustment for losses included in net income — — — (333,170) 74,630 (258,540) Net change in fair value of securities available for sale (157,750) 40,490 (117,260) 138,911 (22,626) 116,285 Unrealized losses on cash flow hedges: Change in fair value of cash flow hedges (29,022) 8,193 (20,829) (66,168) 19,795 (46,373) Less: net cash flow hedge losses reclassified into interest income (1) (13,723) 3,874 (9,849) (34,557) 9,757 (24,800) Net change in fair value of cash flow hedges (15,299) 4,319 (10,980) (31,611) 10,038 (21,573) Defined benefit pension plans: Change in actuarial net loss — — — — — — Less: amortization of actuarial net loss (2,468) 697 (1,771) (7,404) 2,091 (5,313) Less: accretion of prior service credit 2,970 (839) 2,131 8,910 (2,495) 6,415 Net change in other comprehensive income for defined benefit postretirement plans (502) 142 (360) (1,506) 404 (1,102) Total other comprehensive (loss) income $ (173,551) $ 44,951 $ (128,600) $ 105,794 $ (12,184) $ 93,610 (1) Includes amortization of realized gains of less than $0.1 million on terminated cash flow hedges for the nine months ended September 30, 2023. The total original gain of $41.2 million, net of tax, became fully accreted into income during the nine months ended September 30, 2023. Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Pre Tax Tax After Tax Pre Tax Tax After Tax (In thousands) Unrealized losses on securities available for sale: Change in fair value of securities available for sale $ (337,762) $ 76,107 $ (261,655) $ (1,111,187) $ 249,158 $ (862,029) Less: reclassification adjustment for losses included in net income (198) 12 (186) (2,474) 714 (1,760) Net change in fair value of securities available for sale (337,564) 76,095 (261,469) (1,108,713) 248,444 (860,269) Unrealized losses on cash flow hedges: Change in fair value of cash flow hedges (72,667) 19,304 (53,363) (71,182) 18,899 (52,283) Less: net cash flow hedge gains reclassified into interest income (1) 3,755 (1,056) 2,699 12,797 (3,598) 9,199 Net change in fair value of cash flow hedges (76,422) 20,360 (56,062) (83,979) 22,497 (61,482) Defined benefit pension plans: Change in actuarial net loss — — — — — — Less: amortization of actuarial net loss (2,799) 787 (2,012) (8,395) 2,360 (6,035) Less: accretion of prior service credit 2,971 (835) 2,136 8,911 (2,505) 6,406 Net change in other comprehensive income for defined benefit postretirement plans (172) 48 (124) (516) 145 (371) Total other comprehensive loss $ (414,158) $ 96,503 $ (317,655) $ (1,193,208) $ 271,086 $ (922,122) (1) Includes amortization of realized gains on terminated cash flow hedges for the three and nine months ended September 30, 2022. The total realized gain of $41.2 million, net of tax, was fully recognized in earnings in the first quarter of 2023. The balance of this gain had amortized to $0.4 million, net of tax, at September 30, 2022. The following table illustrates the changes in the balances of each component of accumulated other comprehensive loss, net of tax: Unrealized Unrealized Defined Benefit Total (In thousands) Beginning Balance: January 1, 2023 $ (880,156) $ (50,159) $ 7,123 $ (923,192) Other comprehensive loss before reclassifications (142,255) (46,373) — (188,628) Less: Amounts reclassified from accumulated other comprehensive loss (258,540) (24,800) 1,102 (282,238) Net current-period other comprehensive income (loss) 116,285 (21,573) (1,102) 93,610 Ending Balance: September 30, 2023 $ (763,871) $ (71,732) $ 6,021 $ (829,582) Beginning Balance: January 1, 2022 $ (58,586) $ 7,361 $ (5,471) $ (56,696) Other comprehensive loss before reclassifications (862,029) (52,283) — (914,312) Less: Amounts reclassified from accumulated other comprehensive loss (1,760) 9,199 371 7,810 Net current-period other comprehensive loss (860,269) (61,482) (371) (922,122) Ending Balance: September 30, 2022 $ (918,855) $ (54,121) $ (5,842) $ (978,818)

Discontinued Operations

Discontinued Operations	9 Months Ended
Discontinued Operations	Sep. 30, 2023
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations On September 19, 2023, the Company announced that it had entered into an asset purchase agreement (“the agreement”) with Arthur J. Gallagher & Co. (“Gallagher”) to sell substantially all of the assets of its insurance agency business for a gross purchase price of $515.0 million. The agreement also provides for the assumption of certain liabilities of the insurance agency business by Gallagher. Management made the decision to sell certain assets and transfer certain liabilities of its insurance agency business to recognize the valuation premium of the business, while allowing the Company to focus on growth and strategic initiatives of its core banking business. The sale closed on October 31, 2023. Refer to Note 20, “Subsequent Events” for additional discussion. In September 2023, following the approval of the sale by the Company’s board of directors, the Company reclassified substantially all of the assets and certain liabilities of its insurance agency business as held for sale in connection with a planned disposition of the business. A business is classified as held for sale when management, having the authority to approve the action, commits to a plan to sell the business, the sale is probable to occur during the next 12 months at a price that is reasonable in relation to its current fair value, and certain other criteria are met. In accordance with ASC 205, Presentation of Financial Statements , the Company classifies operations as discontinued when they meet all the criteria to be classified as held for sale and when the sale represents a strategic shift that will have a major impact on the Company’s financial condition and results of operations. Accordingly, the Consolidated Balance Sheets, Consolidated Statements of Income, and Consolidated Statements of Cash flows present discontinued operations for the current period and were adjusted on a retrospective basis for prior periods. In addition, the assets and liabilities were remeasured at the lower of their respective carrying amount or fair value less costs to sell in accordance with ASC 360, Property, Plant, and Equipment . The following is a summary of the assets and liabilities of the discontinued insurance agency business as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (In thousands) Assets Premises and equipment $ 50 $ 163 Goodwill and intangibles, net 91,115 93,117 Deferred income taxes, net (187) (315) Prepaid expenses 476 532 Other assets 33,264 34,722 Total assets $ 124,718 $ 128,219 Liabilities Other liabilities $ 34,820 $ 34,930 Total liabilities $ 34,820 $ 34,930 Certain assets and liabilities previously reported as assets and liabilities of the insurance agency business will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the asset sale. The following is a summary of such assets and liabilities as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (In thousands) Assets Cash $ 77,852 $ 66,507 Premises and equipment (1) 1,776 1,792 Bank-owned life insurance 2,109 2,066 Deferred income taxes 3,457 3,662 Other assets (2) 11,187 12,944 Total assets $ 96,381 $ 86,971 Liabilities Other liabilities (3) $ 12,166 $ 14,013 Total liabilities $ 12,166 $ 14,013 (1) Includes buildings and related improvements. (2) Primarily includes assets held in rabbi trusts and the ROU asset associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. (3) Primarily includes employee post-retirement liabilities and the lease liability associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. The following presents operating results of the discontinued insurance agency business for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: Insurance commissions $ 25,897 $ 23,926 $ 85,177 $ 77,511 Other noninterest income 13 41 51 137 Total noninterest income 25,910 23,967 85,228 77,648 Noninterest expense: Salaries and employee benefits 24,655 16,768 57,991 49,057 Office occupancy and equipment 2,755 823 4,279 2,401 Data processing 1,013 1,052 3,216 3,248 Professional services 1,291 549 2,615 738 Marketing expenses 53 101 152 182 Amortization of intangible assets 665 734 2,002 1,868 Other 1,514 1,186 3,976 3,613 Total noninterest expense 31,946 21,213 74,231 61,107 (Loss) income from discontinued operations before income tax expense (6,036) 2,754 10,997 16,541 Income tax (benefit) expense (1,685) 785 3,125 4,669 (Loss) income from discontinued operations, net of taxes $ (4,351) $ 1,969 $ 7,872 $ 11,872 Certain income and expense amounts were excluded from discontinued operations as they relate to assets and liabilities which will not be assumed by Gallagher. The following is a summary of such items and the corresponding income tax effect for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: (Losses) income from investments held in rabbi trusts $ (91) $ (266) $ 489 $ (1,634) Other noninterest income (1) 15 14 44 40 Total noninterest (loss) income (76) (252) 533 (1,594) Noninterest expense: Salaries and employee benefits (2) (96) (268) 484 (1,616) Office occupancy and equipment (3) 102 125 343 375 Other (4) 474 129 1,468 320 Total noninterest expense 480 (14) 2,295 (921) Loss before income tax expense (556) (238) (1,762) (673) Income tax benefit (156) (67) (495) (189) Net loss (400) (171) (1,267) (484) (1) Includes income on Company-owned life insurance policies which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (2) Includes expenses, which were a net credit, associated with certain employee post-retirement benefit plan expenses. (3) Includes depreciation expense associated with buildings and related improvements and ROU asset amortization related to one lease which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (4) Includes intercompany expenses and other expenses associated with the Defined Benefit Plan and BEP. Continuing Involvement Pursuant to the agreement, the Company will perform certain transitional services to Gallagher for up to 6 months following the closing of the sale. Such services include certain information and technology support and human resources support. The Company will be compensated for such services on a monthly basis and estimates the total compensation to be $1.0 million over the six month period plus reimbursement of any amounts paid by the Company in connection with its performance of the transitional services. Leases During the three and nine months ended September 30, 2023, upon reclassification of the above assets and liabilities to assets and liabilities of discontinued operations, the Company re-assessed the ROU assets of certain leases which will be assumed by Gallagher at closing and made the decision to abandon certain leases which will not be assumed by Gallagher and for which Eastern Insurance Group is the lessee. The ROU asset and lease liability of leases included in assets and liabilities of discontinued operations and which will either be assumed by Gallagher or terminated by the Company was $1.0 million and $3.5 million, respectively, at September 30, 2023 and $8.7 million and $9.2 million, respectively, at December 31, 2022. The Company will retain one lease for which Eastern Insurance Group is the current lessee. The lease will be partially sublet to Gallagher and transferred to the Bank upon dissolution of Eastern Insurance Group following the sale. The ROU asset and lease liability for such lease was $0.4 million and $0.6 million, respectively, at September 30, 2023 and $1.9 million and $2.2 million, respectively, at December 31, 2022. The Company remeasured the present value of the future lease payments related to each lease for which Eastern Insurance Group is the lessee which resulted in a net reduction of the lease liabilities and a corresponding net reduction of the lease ROU assets of $6.4 million. The Company recorded an impairment charge of $2.0 million related to leases which will be terminated early following the closing of the asset sale. The impairment charge was included in net (loss) income from discontinued operations for the three and nine months ended September 30, 2023. Revenue Recognition - Insurance Commissions The Company currently acts as an agent in offering property, casualty, and life and health insurance to both commercial and consumer customers though Eastern Insurance Group. The Company may also earn additional commissions from the insurers based upon meeting certain criteria, such as premium levels, growth rates, new business volume and loss experience. The Company recognizes commission revenues when earned based upon the effective date of the policy or when services are rendered. Certain revenues are deferred to reflect delivery of services over the contract period. Upon the transfer of Eastern Insurance Group’s assets to Arthur J. Gallagher & Co., which occurred on October 31, 2023, the Company ceased to offer insurance products and services and thus no longer receives insurance-related commissions and revenues. The Company earns a fixed commission rate on the sales of these products and services. Commissions are earned on the contract effective date and generally are based upon a percentage of premiums for insurance coverage. Commission rates depend upon a large number of factors, including the type of risk being placed, the particular underwriting enterprise’s demand, the expected loss experience of the particular risk coverage, and historical benchmarks surrounding the level of effort necessary for the Company to place and service the insurance contract. The vast majority of the Company’s services and revenues are associated with the placement of an insurance contract. Insurance commissions earned but not yet received amounted to $16.1 million and $15.1 million as of September 30, 2023 and December 31, 2022, respectively, and were included in assets of discontinued operations on the Consolidated Balance Sheets.

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 31, 2023, the Company completed the sale of its insurance agency business for net cash consideration of $498.1 million, subject to customary post-closing working capital adjustments. The net cash proceeds include the gross purchase price pursuant to the agreement of $515.0 million and an estimated working capital adjustment of $4.2 million, which were reduced by transaction expenses of $17.0 million and the settlement of certain obligations of the Company primarily related to employee post-retirement liabilities that originated prior to closing of $4.1 million. In addition, the Company transferred $7.4 million in fiduciary cash to Gallagher upon closing which is not included in the amount of net cash consideration of $498.1 million. In connection with the sale, the Company recognized a gain on sale of approximately $389.3 million, which is subject to certain post-closing adjustments related to working capital and transaction expenses. Refer to Note 19, “Discontinued Operations” for additional information regarding the Company’s sale of its insurance agency business. In addition, the Company recognized indirect noninterest expenses associated with the sale of approximately $24.2 million. In connection with the sale of its insurance agency business, the Company amended its Defined Benefit Plan and BEP (the “Plans”), as well as the ESOP, to allow for accelerated vesting for all employees of the insurance agency business and several employees of the Bank transitioning to Gallagher who are participating in the Plan. In addition, the amendments included an amendment to the vesting criteria for the BEP whereby all participants have been credited with service vesting in the same manner and vest according to the same three year cliff vesting schedule as provided under the Defined Benefit Plan. In addition, in accordance with ASC 715-20, “Compensation-Retirement Benefits - Defined Benefit Plans,” the Company recognized a curtailment gain upon completion of the sale of the insurance agency business associated with the prior service credits attributable to the employees of the insurance agency business, all of which transferred to Gallagher. As of the date of this Quarterly Report on Form 10-Q, management estimates the amount of such non-cash settlement credit to be a gain within the range of $13.0 million and $18.0 million, representing the combined effect of the amendments to the Defined Benefit Plan and BEP.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income (loss)	$ 59,113	$ 54,777	$ (86,326)	$ 157,465

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The Company’s Consolidated Financial Statements have been prepared in conformity with accounting principles generally accepted in the United States (“GAAP”) as set forth by the Financial Accounting Standards Board (“FASB”) and its Accounting Standards Codification (“ASC”) and Accounting Standards Updates (“ASU”) as well as the rules and interpretive releases of the U.S. Securities and Exchange Commission (“SEC”) under the authority of federal securities laws. The Consolidated Financial Statements include the accounts of the Company, its wholly-owned subsidiaries and entities in which it holds a controlling financial interest through being the primary beneficiary or through holding a majority of the voting interest. All intercompany accounts and transactions have been eliminated in consolidation. Certain previously reported amounts have been reclassified to conform to the current period’s presentation which included certain loan servicing-related costs which have been reclassified from professional services to loan expense. In addition, as a result of the decision to sell substantially all of the assets and transfer substantially all of the liabilities of Eastern Insurance Group, the Company reclassified certain amounts previously reported including: • certain assets and liabilities previously reported in the insurance agency business were reclassified to assets and liabilities of discontinued operations, respectively, on the Consolidated Balance Sheets; • certain components of noninterest income and noninterest expense previously reported in the insurance agency business were reclassified to net income from discontinued operations on the Consolidated Statements of Income; and • certain operating, investing, and financing cash flows previously reported on their applicable lines within the Consolidated Statements of Cash Flows were reclassified to cash flows used in/provided by operating activities of, investment activities of and financing activities of discontinued operations, respectively. The accompanying Consolidated Balance Sheet as of September 30, 2023, the Consolidated Statements of Income and Comprehensive Income and of Changes in Shareholders’ Equity for the three and nine months ended September 30, 2023 and 2022 and Statements of Cash Flows for the nine months ended September 30, 2023 and 2022 are unaudited. The Consolidated Balance Sheet as of December 31, 2022 was derived from the Audited Consolidated Financial Statements as of that date. The interim Consolidated Financial Statements and the accompanying notes should be read in conjunction with the annual Consolidated Financial Statements and the accompanying notes contained within the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022 (“2022 Form 10-K”), as filed with the SEC. In the opinion of management, the Company’s Consolidated Financial Statements reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the results of operations for the periods presented. The results for the three and nine months ended September 30, 2023 are not necessarily indicative of results to be expected for the year ending December 31, 2023, any other interim periods, or any future year or period.
Use of Estimates	Use of Estimates In preparing the Consolidated Financial Statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheets and income and expenses for the periods reported. Actual results could differ from those estimates based on changing conditions, including economic conditions and future events. Material estimates that are particularly susceptible to change relate to the determination of the allowance for credit losses, valuation and fair value measurements, the liabilities for benefit obligations (particularly pensions), the provision for income taxes and impairment of goodwill and other intangibles.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Relevant standards that were recently issued but not yet adopted as of September 30, 2023: In March 2023, the FASB issued ASU 2023-02, Investments–Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method (“ASU 2023-02”). This update permits reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if the following conditions are met: 1. It is probable that the income tax credits allocable to the tax equity investor will be available. 2. The tax equity investor does not have the ability to exercise significant influence over the operating and financial policies of the underlying project. 3. Substantially all of the projected benefits are from income tax credits and other income tax benefits. Projected benefits include income tax credits, other income tax benefits, and other non-income-tax-related benefits. The projected benefits are determined on a discounted basis, using a discount rate that is consistent with the cash flow assumptions used by the tax equity investor in making its decision to invest in the project. 4. The tax equity investor’s projected yield based solely on the cash flows from the income tax credits and other income tax benefits is positive. 5. The tax equity investor is a limited liability investor in the limited liability entity for both legal and tax purposes, and the tax equity investor’s liability is limited to its capital investment. Under existing accounting standards, the proportional amortization method is allowable only for equity investments in low-income-housing tax credit structures. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the income tax credits and other income tax benefits received and recognizes the net amortization and income tax credits and other income tax benefits in the income statement as a component of income tax expense (benefit). Updates made by ASU 2023-02 allow a reporting entity to make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis. The Company had previously made an accounting policy election to account for its investments in low-income-housing tax credit investments using the proportional amortization method. This election was made upon the Company’s adoption of ASU 2014-01, Investments–Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects , which introduced the option to apply proportional amortization to low-income-housing tax credit investments . For public business entities, the amendments in ASU 2023-02 are effective for fiscal years beginning after December 15, 2023, including interim periods within those fiscal years. Early adoption is permitted for all entities in an interim period. The Company expects the adoption of this standard will not have a material impact on its Consolidated Financial Statements. In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements–Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative (“ASU 2023-06”) . The amendments in this update modify the disclosure or presentation requirements for a variety of topics in the codification. Certain amendments represent clarifications to or technical corrections of the current requirements. The following is a summary of the topics included in the update and which pertain to the Company: 1. Statement of cash flows (Topic 230): Requires an accounting policy disclosure in annual periods of where cash flows associated with derivative instruments and their related gains and loses are presented in the statement of cash flows; 2. Accounting changes and error corrections (Topic 250): Requires that when there has been a change in the reporting entity, the entity disclose any material prior-period adjustment and the effect of the adjustment on retained earnings in interim financial statements; 3. Earnings per share (Topic 260): Requires disclosure of the methods used in the diluted earnings-per-share computation for each dilutive security and clarifies that certain disclosures should be made during interim periods, and amends illustrative guidance to illustrate disclosure of the methods used in the diluted earnings per share computation; 4. Commitments (Topic 440): Requires disclosure of assets mortgaged, pledged, or otherwise subject to lien and the obligations collateralized; and 5. Debt (Topic 470): Requires disclosure of amounts and terms of unused lines of credit and unfunded commitments and the weighted-average interest rate on outstanding short-term borrowings. For public business entities, the amendments in ASU 2023-06 are effective on the date which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective. If by June 30, 2027, the SEC has not removed the applicable requirement from Regulation and S-X or Regulation S-K, the pending content of the related amendment will be removed from the codification and will not become effective for any entity. Early adoption is not permitted and the amendments are required to be applied on a prospective basis. The Company expects the adoption of this standard will not have a material impact on its Consolidated Financial Statements. Relevant standards that were adopted during the nine months ended September 30, 2023: In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (“ASU 2021-08”). This update modifies how an acquiring entity measures contract assets and contract liabilities of an acquiree in a business combination in accordance with Topic 606. The amendments in this update require the acquiring entity in a business combination to account for revenue contracts as if they had originated the contract and assess how the acquiree accounted for the contract under Topic 606. ASU 2021-08 improves comparability of recognition and measurement of revenue contracts with customers both before and after a business combination. For public business entities, the amendments in this update were effective for fiscal years beginning after December 15, 2022. For all other entities, the amendments are effective for fiscal years beginning after December 15, 2023. The amendments in this update should be applied prospectively to business combinations occurring on or after the effective date of the amendments with early adoption permitted. The adoption of this standard on January 1, 2023 did not have a material impact on the Company’s Consolidated Financial Statements. In March 2022, the FASB issued ASU 2022-02, Financial Instruments–Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”). The amendments in this update eliminate the accounting guidance on troubled debt restructurings (“TDRs”) for creditors in ASC 310-40 and amends the guidance on vintage disclosures, referenced in ASC 326-20-50, to require disclosure of current-period gross write-offs by year of origination. This update supersedes the existing accounting guidance for TDRs in ASC 310-40 in its entirety and requires entities to evaluate all receivable modifications under existing accounting guidance in ASC 310-20 to determine whether a modification made to a borrower results in a new loan or a continuation of an existing loan. In addition to the elimination of TDR accounting guidance, entities that adopt this update will no longer consider renewals, modifications and extensions that result from reasonably expected TDRs in their calculation of the allowance for credit losses. Further, if an entity employs a discounted cash flow method to calculate the allowance for credit losses, it will be required to use a post-modification-derived effective interest rate as part of its calculation. This update also requires new disclosures for receivables for which there has been a modification in their contractual cash flows resulting from borrowers experiencing financial difficulties. For public business entities, the amendments in this update were effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Entities may elect to apply the updated guidance on TDR recognition and measurement by using a modified retrospective transition method. The amendments on TDR disclosures and vintage disclosures should be adopted prospectively. On January 1, 2023, the Company adopted this standard by using the modified retrospective transition method, except with regard to amendments on TDR and vintage disclosures which were adopted prospectively. Accordingly, the Company recorded a cumulative-effect adjustment to retained earnings as of January 1, 2023. The adoption of this standard did not have a material impact on the Company’s Consolidated Financial Statements.
Allowance for Loan Losses - Loans Held for Investment	Allowance for Loan Losses - Loans Held for Investment Modifications of Loans to Borrowers Experiencing Financial Difficulty The amendments in ASU 2022-02 eliminated the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables—Troubled Debt Restructurings by Creditors , while enhancing disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Thus, as a result of adoption of this standard on January 1, 2023, rather than applying the recognition and measurement guidance for TDRs, the Company now applies the loan refinancing and restructuring guidance codified in paragraphs 310-20-35-9 through 35-11 of the Accounting Standards Codification to determine whether a modification results in a new loan or a continuation of an existing loan. Modifications to borrowers experiencing financial difficulty include principal forgiveness, interest rate reductions, term extensions, other-than-insignificant payment delays and combinations thereof. Expected losses or recoveries related to loans where modifications have been granted to borrowers experiencing financial difficulty have been included in the Company’s determination of the allowance for loan losses. Upon adoption of ASU 2022-02, the Company is no longer required to use a discounted cash flow method to measure the allowance for loan losses resulting from a modification to a borrower experiencing financial difficulty. Accordingly, the Company now applies the same credit methodology it uses for similar loans that were not modified. As previously indicated, the Company adopted ASU 2022-02 using the modified retrospective transition method. Accordingly, upon adoption, commercial loan TDRs existing at that time which were measured using a discounted cash flow methodology and all residential real estate and consumer home equity loan TDRs were transitioned to the applicable segment of loans collectively evaluated for impairment based upon their risk characteristics. Commercial loan TDRs determined to be collateral dependent continue to be assessed for impairment on an individual basis. Prior to the Company’s adoption of ASU 2022-02, in cases where a borrower was experiencing financial difficulties and the Company made certain concessionary modifications to contractual terms, the loan was classified as a TDR. Modifications included adjustments to interest rates, extensions of maturity, consumer loans where the borrower’s obligations had been effectively discharged through Chapter 7 bankruptcy and the borrower had not reaffirmed the debt to the Company, and other actions intended to minimize economic loss and avoid foreclosure or repossession of collateral. Management identified loans as TDR loans when it had a reasonable expectation that it would execute a TDR modification with a borrower. In addition, management estimated expected credit losses on a collective basis if a group of TDR loans shared similar risk characteristics. If a TDR loan’s risk characteristics were not similar to those of any of the Company’s other TDR loans, expected credit losses on the TDR loan were measured individually. The impairment analysis discounted the present value of the anticipated cash flows by the loan’s contractual rate of interest in effect prior to the loan’s modification or the fair value of collateral if the loan was collateral dependent. The amount of credit loss, if any, was recorded as a specific loss allocation to each individual loan or as a loss allocation to the pool of loans, for those loans for which credit loss was measured on a collective basis, in the allowance for credit losses. Any commercial (commercial and industrial, commercial real estate, commercial construction, and business banking loans) or residential loan that had been classified as a TDR and which subsequently defaulted was reviewed to determine if the loan should be deemed collateral-dependent. In such an instance, any shortfall between the value of the collateral and the book value of the loan was determined by measuring the recorded investment in the loan against the fair value of the collateral less costs to sell.

Securities (Tables)

Securities (Tables)	9 Months Ended
Securities (Tables)	Sep. 30, 2023
Debt Securities [Abstract]
Debt Securities, Available-for-Sale	The amortized cost, gross unrealized gains and losses, allowance for credit losses (“ACL”) and fair value of available for sale (“AFS”) securities as of the dates indicated were as follows: As of September 30, 2023 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 3,380,463 $ — $ (679,833) $ — $ 2,700,630 Government-sponsored commercial mortgage-backed securities 1,343,187 — (254,067) — 1,089,120 U.S. Agency bonds 236,149 — (28,184) — 207,965 U.S. Treasury securities 99,494 — (6,275) — 93,219 State and municipal bonds and obligations 197,971 — (27,387) — 170,584 $ 5,257,264 $ — $ (995,746) $ — $ 4,261,518 As of December 31, 2022 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 4,855,763 $ — $ (743,855) $ — $ 4,111,908 Government-sponsored commercial mortgage-backed securities 1,570,119 — (221,165) — 1,348,954 U.S. Agency bonds 1,100,891 — (148,409) — 952,482 U.S. Treasury securities 99,324 — (6,267) — 93,057 State and municipal bonds and obligations 198,039 9 (14,956) — 183,092 Other debt securities 1,299 — (14) — 1,285 $ 7,825,435 $ 9 $ (1,134,666) $ — $ 6,690,778
Schedule of Realized Gain (Loss)	The following table summarizes gross realized gains and losses from sales of AFS securities for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Gross realized gains from sales of AFS securities $ — $ 725 $ — $ 1,770 Gross realized losses from sales of AFS securities — (923) (333,170) (4,244) Net (losses) gains from sales of AFS securities $ — $ (198) $ (333,170) $ (2,474)
Summary of Government-Sponsored Residential Mortgage-Backed Securities with Gross Unrealized Losses	Information pertaining to AFS securities with gross unrealized losses as of September 30, 2023 and December 31, 2022, for which the Company did not recognize a provision for credit losses under the current expected credit loss methodology (“CECL”), aggregated by investment category and length of time that individual securities had been in a continuous loss position, is as follows: As of September 30, 2023 Less than 12 Months 12 Months or Longer Total # of Gross Fair Gross Fair Gross Fair (Dollars in thousands) Government-sponsored residential mortgage-backed securities 324 $ — $ — $ 679,833 $ 2,700,630 $ 679,833 $ 2,700,630 Government-sponsored commercial mortgage-backed securities 188 — — 254,067 1,089,120 254,067 1,089,120 U.S. Agency bonds 23 — — 28,184 207,965 28,184 207,965 U.S. Treasury securities 6 104 4,854 6,171 88,365 6,275 93,219 State and municipal bonds and obligations 242 5,216 48,268 22,171 122,316 27,387 170,584 783 $ 5,320 $ 53,122 $ 990,426 $ 4,208,396 $ 995,746 $ 4,261,518 As of December 31, 2022 Less than 12 Months 12 Months or Longer Total # of Gross Fair Gross Fair Gross Fair (Dollars in thousands) Government-sponsored residential mortgage-backed securities 322 $ 42,196 $ 435,690 $ 701,659 $ 3,676,218 $ 743,855 $ 4,111,908 Government-sponsored commercial mortgage-backed securities 199 38,944 300,476 182,221 1,048,478 221,165 1,348,954 U.S. Agency bonds 37 645 4,145 147,764 948,337 148,409 952,482 U.S. Treasury securities 5 1,311 48,451 4,956 44,606 6,267 93,057 State and municipal bonds and obligations 237 14,942 179,614 14 225 14,956 179,839 Other debt securities 2 — — 14 1,285 14 1,285 802 $ 98,038 $ 968,376 $ 1,036,628 $ 5,719,149 $ 1,134,666 $ 6,687,525
Debt Securities, Held-to-Maturity	The amortized cost, gross unrealized gains and losses, allowance for credit losses and fair value of held to maturity (“HTM”) securities as of the dates indicated were as follows: As of September 30, 2023 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 260,271 $ — $ (40,723) $ — $ 219,548 Government-sponsored commercial mortgage-backed securities 195,629 — (27,523) — 168,106 $ 455,900 $ — $ (68,246) $ — $ 387,654 As of December 31, 2022 Amortized Unrealized Unrealized Allowance for Credit Losses Fair (In thousands) Debt securities: Government-sponsored residential mortgage-backed securities $ 276,493 $ — $ (30,150) $ — $ 246,343 Government-sponsored commercial mortgage-backed securities 200,154 — (23,271) — 176,883 $ 476,647 $ — $ (53,421) $ — $ 423,226
Summary of Fair Value of Available for Sale Securities by Contractual Maturities	The scheduled contractual maturities of AFS and HTM securities as of the dates indicated were as follows: As of September 30, 2023 Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) AFS securities Government-sponsored residential mortgage-backed securities $ — $ — $ 27,697 $ 26,351 $ 28,637 $ 26,316 $ 3,324,129 $ 2,647,963 $ 3,380,463 $ 2,700,630 Government-sponsored commercial mortgage-backed securities — — 164,329 145,815 475,624 398,011 703,234 545,294 1,343,187 1,089,120 U.S. Agency bonds — — 226,493 199,833 9,656 8,132 — — 236,149 207,965 U.S. Treasury securities — — 99,494 93,219 — — — — 99,494 93,219 State and municipal bonds and obligations 210 210 29,120 26,998 42,656 38,408 125,985 104,968 197,971 170,584 Total available for sale securities 210 210 547,133 492,216 556,573 470,867 4,153,348 3,298,225 5,257,264 4,261,518 HTM securities Government-sponsored residential mortgage-backed securities — — — — — — 260,271 219,548 260,271 219,548 Government-sponsored commercial mortgage-backed securities — — — — 195,629 168,106 — — 195,629 168,106 Total held to maturity securities — — — — 195,629 168,106 260,271 219,548 455,900 387,654 Total $ 210 $ 210 $ 547,133 $ 492,216 $ 752,202 $ 638,973 $ 4,413,619 $ 3,517,773 $ 5,713,164 $ 4,649,172 As of December 31, 2022 Due in one year or less Due after one year to five years Due after five to ten years Due after ten years Total Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value Amortized Cost Fair Value (In thousands) AFS securities Government-sponsored residential mortgage-backed securities $ — $ — $ 21,221 $ 20,284 $ 727,908 $ 648,132 $ 4,106,634 $ 3,443,492 $ 4,855,763 $ 4,111,908 Government-sponsored commercial mortgage-backed securities — — 191,762 171,992 649,659 556,641 728,698 620,321 1,570,119 1,348,954 U.S. Agency bonds — — 877,371 767,464 223,520 185,018 — — 1,100,891 952,482 U.S. Treasury securities — — 99,324 93,057 — — — — 99,324 93,057 State and municipal bonds and obligations 213 209 22,100 21,283 42,554 40,970 133,172 120,630 198,039 183,092 Other debt securities 1,299 1,285 — — — — — — 1,299 1,285 Total available for sale securities 1,512 1,494 1,211,778 1,074,080 1,643,641 1,430,761 4,968,504 4,184,443 7,825,435 6,690,778 HTM securities Government-sponsored residential mortgage-backed securities — — — — — — 276,493 246,343 276,493 246,343 Government-sponsored commercial mortgage-backed securities — — — — 200,154 176,883 0 — — 200,154 176,883 Total held to maturity securities — — — — 200,154 176,883 276,493 246,343 476,647 423,226 Total $ 1,512 $ 1,494 $ 1,211,778 $ 1,074,080 $ 1,843,795 $ 1,607,644 $ 5,244,997 $ 4,430,786 $ 8,302,082 $ 7,114,004

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses (Tables)	9 Months Ended
Loans and Allowance for Credit Losses (Tables)	Sep. 30, 2023
Receivables [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable	The following table provides a summary of the Company’s loan portfolio as of the dates indicated: September 30, 2023 December 31, 2022 (In thousands) Commercial and industrial $ 3,087,509 $ 3,150,946 Commercial real estate 5,396,912 5,155,323 Commercial construction 382,615 336,276 Business banking 1,087,799 1,090,492 Residential real estate 2,550,861 2,460,849 Consumer home equity 1,193,859 1,187,547 Other consumer (2)(3) 219,720 194,098 Gross loans before unamortized premiums, unearned discounts and deferred fees 13,919,275 13,575,531 Allowance for loan losses (1) (155,146) (142,211) Unamortized premiums, net of unearned discounts and deferred fees (19,307) (13,003) Loans after the allowance for loan losses, unamortized premiums, unearned discounts and deferred fees $ 13,744,822 $ 13,420,317 (1) The balance of accrued interest receivable excluded from amortized cost and the calculation of the allowance for loan losses amounted to $50.8 million and $45.2 million as of September 30, 2023 and December 31, 2022, respectively, and is included within other assets on the Consolidated Balance Sheets. (2) Automobile loans are included in the other consumer portfolio and amounted to $8.1 million and $18.1 million at September 30, 2023 and December 31, 2022, respectively. (3) Home improvement loans are included in the other consumer portfolio and amounted to $161.2 million and $121.1 million at September 30, 2023 and December 31, 2022, respectively.
Financing Receivable, Allowance for Credit Loss	The following tables summarize the changes in the allowance for loan losses by loan category for the periods indicated: For the Three Months Ended September 30, 2023 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 29,535 $ 59,524 $ 7,663 $ 15,228 $ 27,012 $ 6,044 $ 2,949 $ 147,955 Charge-offs (11) — — (303) — — (731) (1,045) Recoveries 120 2 — 609 30 39 108 908 Provision (release) (3,126) 11,097 136 (316) (687) (601) 825 7,328 Ending balance $ 26,518 $ 70,623 $ 7,799 $ 15,218 $ 26,355 $ 5,482 $ 3,151 $ 155,146 For the Three Months Ended September 30, 2022 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 25,852 $ 47,555 $ 5,474 $ 16,699 $ 21,663 $ 5,662 $ 2,626 $ 125,531 Charge-offs (11) — — (369) — — (603) (983) Recoveries 126 3 — 286 56 6 158 635 Provision (release) 874 3,545 507 (354) 1,288 174 446 6,480 Ending balance $ 26,841 $ 51,103 $ 5,981 $ 16,262 $ 23,007 $ 5,842 $ 2,627 $ 131,663 For the Nine Months Ended September 30, 2023 Commercial Commercial Commercial Business Residential Consumer Other Total (In thousands) Allowance for loan losses: Beginning balance $ 26,859 $ 54,730 $ 7,085 $ 16,189 $ 28,129 $ 6,454 $ 2,765 $ 142,211 Cumulative effect of change in accounting principle (1) 47 — — (140) (849) (201) — (1,143) Charge-offs (11) — — (900) — (7) (1,883) (2,801) Recoveries 285 8 — 1,294 63 40 335 2,025 Provision (release) (662) 15,885 714 (1,225) (988) (804) 1,934 14,854 Ending balance $ 26,518 $ 70,623 $ 7,799 $ 15,218 $ 26,355 $ 5,482 $ 3,151 $ 155,146 For the Nine Months Ended September 30, 2022 Commercial Commercial Commercial Business Residential Consumer Other Other Total (In thousands) Allowance for loan losses: Beginning balance $ 18,018 $ 52,373 $ 2,585 $ 10,983 $ 6,556 $ 3,722 $ 3,308 $ 242 $ 97,787 Cumulative effect of change in accounting principle (2) 11,533 (6,655) 1,485 6,160 13,489 1,857 (541) (242) $ 27,086 Charge-offs (13) — — (1,922) — — (1,754) — (3,689) Recoveries 1,074 53 — 1,678 80 16 533 — 3,434 Provision (release) (3,771) 5,332 1,911 (637) 2,882 247 1,081 — 7,045 Ending balance $ 26,841 $ 51,103 $ 5,981 $ 16,262 $ 23,007 $ 5,842 $ 2,627 $ — $ 131,663 (1) Represents the adjustment needed to reflect the cumulative day one impact pursuant to the Company’s adoption of ASU 2022-02 (i.e., cumulative effect adjustment related to the adoption of ASU 2022-02 as of January 1, 2023). The adjustment represents a $1.1 million decrease to the allowance attributable to the change in accounting methodology for estimating the allowance for loan losses resulting from the Company’s adoption of the standard. (2) Represents the adjustment needed to reflect the cumulative day one impact pursuant to the Company’s adoption of ASU 2016-13 (i.e., cumulative effect adjustment related to the adoption of ASU 2016-13 as of January 1, 2022). The adjustment represents a $27.1 million increase to the allowance attributable to the change in accounting methodology for estimating the allowance for loan losses resulting from the Company’s adoption of the standard. The adjustment also includes the adjustment needed to reflect the day one reclassification of the Company’s PCI loan balances to PCD and the associated gross-up of $0.1 million, pursuant to the Company’s adoption of ASU 2016-13.
Summary of details the internal risk-rating categories for the Company's commercial and industrial, commercial real estate, commercial construction and business banking portfolios	The following table details the amortized cost balances of the Company’s loan portfolios, presented by credit quality indicator and origination year as of September 30, 2023, and gross charge-offs for the nine month period then ended: 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total (In thousands) Commercial and industrial Pass $ 421,454 $ 489,139 $ 377,921 $ 351,075 $ 160,669 $ 656,163 $ 497,576 $ 3,555 $ 2,957,552 Special Mention 8,109 30,704 14,345 13,897 186 633 18,711 456 87,041 Substandard — 12 1,808 422 36 2,672 22,799 — 27,749 Doubtful — — — — — 8 — — 8 Loss — — — — — — — — — Total commercial and industrial 429,563 519,855 394,074 365,394 160,891 659,476 539,086 4,011 3,072,350 Current period gross charge-offs — — — — — 11 — — 11 Commercial real estate Pass 372,774 1,467,477 858,225 575,634 524,549 1,342,646 59,152 2,585 5,203,042 Special Mention — — — 744 2,395 28,343 — — 31,482 Substandard — — 15,356 3,990 50,704 54,851 8,005 — 132,906 Doubtful — — — — — 25,797 — — 25,797 Loss — — — — — — — — — Total commercial real estate 372,774 1,467,477 873,581 580,368 577,648 1,451,637 67,157 2,585 5,393,227 Current period gross charge-offs — — — — — — — — — Commercial construction Pass 99,843 140,590 124,288 — — — 10,727 — 375,448 Special Mention 5,182 — — 7 — — — — 5,189 Substandard — — — — — — — — — Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial construction 105,025 140,590 124,288 7 — — 10,727 — 380,637 Current period gross charge-offs — — — — — — — — — Business banking Pass 107,950 164,497 187,765 152,567 117,485 252,479 71,942 3,433 1,058,118 Special Mention — 572 1,446 3,579 3,778 8,233 1,019 27 18,654 Substandard 1,401 611 3,554 2,127 1,069 3,452 647 584 13,445 Doubtful — — — 20 1,079 500 — — 1,599 Loss — — — — — — — — — Total business banking 109,351 165,680 192,765 158,293 123,411 264,664 73,608 4,044 1,091,816 Current period gross charge-offs — 111 62 56 102 250 23 296 900 Residential real estate Current and accruing 203,704 742,941 672,492 362,610 95,373 464,070 — — 2,541,190 30-89 days past due and accruing 441 4,032 4,343 905 940 8,855 — — 19,516 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 105 726 454 1,000 288 5,502 — — 8,075 Total residential real estate 204,250 747,699 677,289 364,515 96,601 478,427 — — 2,568,781 Current period gross charge-offs — — — — — — — — — Consumer home equity Current and accruing 27,721 86,954 9,557 5,189 4,356 84,939 954,862 7,028 1,180,606 30-89 days past due and accruing — 196 — — — 647 7,675 377 8,895 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — 67 — — — 1,788 5,472 179 7,506 Total consumer home equity 27,721 87,217 9,557 5,189 4,356 87,374 968,009 7,584 1,197,007 Current period gross charge-offs — — — — — — 7 — 7 Other consumer Current and accruing 72,222 39,286 26,060 13,635 12,949 18,047 13,030 112 195,341 30-89 days past due and accruing 126 143 61 19 68 183 28 — 628 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 13 62 10 — — 47 — 49 181 Total other consumer 72,361 39,491 26,131 13,654 13,017 18,277 13,058 161 196,150 Current period gross charge-offs 746 307 296 90 84 200 160 — 1,883 Total $ 1,321,045 $ 3,168,009 $ 2,297,685 $ 1,487,420 $ 975,924 $ 2,959,855 $ 1,671,645 $ 18,385 $ 13,899,968 (1) The amounts presented represent the amortized cost as of September 30, 2023 of revolving loans that were converted to term loans during the nine months ended September 30, 2023. The following table details the amortized cost balances of the Company’s loan portfolios, presented by credit quality indicator and origination year as of December 31, 2022 : 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted to Term Loans (1) Total (In thousands) Commercial and industrial Pass $ 778,144 $ 479,317 $ 415,990 $ 199,865 $ 100,716 $ 639,825 $ 473,148 $ 50 $ 3,087,055 Special Mention 2,298 1,307 7,267 4,841 147 — 1,196 670 17,726 Substandard 294 4,954 2,644 46 2,598 7,854 485 346 19,221 Doubtful — 5,249 — — — 23 3,254 — 8,526 Loss — — — — — — — — — Total commercial and industrial 780,736 490,827 425,901 204,752 103,461 647,702 478,083 1,066 3,132,528 Commercial real estate Pass 1,510,675 825,620 586,567 581,840 461,296 1,006,160 52,590 4,187 5,028,935 Special Mention — — 771 4,204 15,366 12,255 — — 32,596 Substandard — — 2,621 19,796 24,532 34,883 8,000 — 89,832 Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial real estate 1,510,675 825,620 589,959 605,840 501,194 1,053,298 60,590 4,187 5,151,363 Commercial construction Pass 91,397 178,648 28,956 20,767 — — 12,130 — 331,898 Special Mention — — 2,361 — — — — — 2,361 Substandard — — — — — — — — — Doubtful — — — — — — — — — Loss — — — — — — — — — Total commercial construction 91,397 178,648 31,317 20,767 — — 12,130 — 334,259 Business banking Pass 178,806 202,230 170,088 128,282 59,452 233,484 78,080 4,770 1,055,192 Special Mention — 991 4,635 4,605 3,740 7,584 145 — 21,700 Substandard — 3,482 1,424 2,663 570 7,505 2,230 221 18,095 Doubtful — — — 181 — 70 — — 251 Loss — — — — — — — — — Total business banking 178,806 206,703 176,147 135,731 63,762 248,643 80,455 4,991 1,095,238 Residential real estate Current and accruing 761,442 696,959 382,262 99,494 66,702 434,720 — — 2,441,579 30-89 days past due and accruing 4,652 5,470 1,245 2,762 2,951 11,646 — — 28,726 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — — 144 1,491 1,015 7,100 — — 9,750 Total residential real estate 766,094 702,429 383,651 103,747 70,668 453,466 — — 2,480,055 Consumer home equity Current and accruing 97,395 10,774 5,840 5,015 21,092 73,927 953,829 7,320 1,175,192 30-89 days past due and accruing 559 — — — 72 944 7,239 247 9,061 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual — — — 61 274 1,303 5,120 296 7,054 Total consumer home equity 97,954 10,774 5,840 5,076 21,438 76,174 966,188 7,863 1,191,307 Other consumer Current and accruing 55,414 32,390 17,641 18,298 18,832 16,603 17,476 — 176,654 30-89 days past due and accruing 143 68 43 61 240 178 58 7 798 Loans 90 days or more past due and still accruing — — — — — — — — — Non-accrual 31 93 39 2 92 44 15 10 326 Total other consumer 55,588 32,551 17,723 18,361 19,164 16,825 17,549 17 177,778 Total $ 3,481,250 $ 2,447,552 $ 1,630,538 $ 1,094,274 $ 779,687 $ 2,496,108 $ 1,614,995 $ 18,124 $ 13,562,528 (1) The amounts presented represent the amortized cost as of December 31, 2022 of revolving loans that were converted to term loans during the year ended December 31, 2022.
Summary of age analysis of past due loans	The following tables show the age analysis of past due loans as of the dates indicated: As of September 30, 2023 30-59 60-89 90 or More Total Past Current Total (In thousands) Commercial and industrial $ 1,030 $ — $ 465 $ 1,495 $ 3,070,855 $ 3,072,350 Commercial real estate — — — — 5,393,227 5,393,227 Commercial construction — — — — 380,637 380,637 Business banking 4,536 1,846 1,539 7,921 1,083,895 1,091,816 Residential real estate 17,988 2,846 5,621 26,455 2,542,326 2,568,781 Consumer home equity 6,232 2,661 7,430 16,323 1,180,684 1,197,007 Other consumer 470 158 181 809 195,341 196,150 Total $ 30,256 $ 7,511 $ 15,236 $ 53,003 $ 13,846,965 $ 13,899,968 As of December 31, 2022 30-59 60-89 90 or More Total Past Current Total (In thousands) Commercial and industrial $ 1,300 $ 385 $ 2,074 $ 3,759 $ 3,128,769 $ 3,132,528 Commercial real estate — — — — 5,151,363 5,151,363 Commercial construction — — — — 334,259 334,259 Business banking 6,642 845 3,517 11,004 1,084,234 1,095,238 Residential real estate 25,877 3,852 6,456 36,185 2,443,870 2,480,055 Consumer home equity 8,262 1,108 6,525 15,895 1,175,412 1,191,307 Other consumer 634 170 320 1,124 176,654 177,778 Total (1) $ 42,715 $ 6,360 $ 18,892 $ 67,967 $ 13,494,561 $ 13,562,528 (1) The amounts presented in the table above represent the recorded investment balance of loans as of December 31, 2022.
Summary pertaining to the breakdown of the Company's nonaccrual loans	The following table presents information regarding non-accrual loans as of the dates indicated: As of September 30, 2023 As of December 31, 2022 Non-Accrual Loans With ACL Non-Accrual Loans Without ACL (1) Total Nonaccrual Loans Non-Accrual Loans With ACL Non-Accrual Loans Without ACL (1) Total Nonaccrual Loans (In thousands) Commercial and industrial $ 4 $ 466 $ 470 $ 3,270 $ 10,707 $ 13,977 Commercial real estate 25,797 — 25,797 — — — Commercial construction — — — — — — Business banking 5,422 14 5,436 5,844 1,653 7,497 Residential real estate 8,075 — 8,075 9,750 — 9,750 Consumer home equity 7,506 — 7,506 7,054 — 7,054 Other consumer 181 — 181 326 — 326 Total non-accrual loans $ 46,985 $ 480 $ 47,465 $ 26,244 $ 12,360 $ 38,604 (1) The loans on non-accrual status and without an ACL as of both September 30, 2023 and December 31, 2022 , were primarily comprised of collateral dependent loans for which the fair value of the underlying loan collateral exceeded the loan carrying value.
Summary of the modifications which occurred during the periods and the change in the recorded investment subsequent to the modifications occurring	The following table shows the amortized cost balance as of September 30, 2023 of loans modified during the periods noted below to borrowers experiencing financial difficulty by the type of concession granted: Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Amortized Cost Balance % of Total Portfolio Amortized Cost Balance % of Total Portfolio (Dollars in thousands) Interest Rate Reduction: Business banking $ — — % $ 46 0.00 % Residential real estate — — % 305 0.01 % Consumer home equity 203 0.02 % 1,441 0.12 % Total interest rate reduction $ 203 0.00 % $ 1,792 0.01 % Other-than-Insignificant Delay in Repayment: Business banking $ 21 0.00 % $ 21 0.00 % Residential real estate 2,084 0.08 % 2,517 0.10 % Consumer home equity 84 0.01 % 684 0.06 % Total other-than-insignificant delay in repayment $ 2,189 0.02 % $ 3,222 0.02 % Term Extension: Business banking — — % 259 0.02 % Total term extension $ — — % $ 259 0.00 % Combination—Interest Rate Reduction & Other-than-Insignificant Delay in Repayment: Business banking $ — — % $ 90 0.01 % Consumer home equity 428 0.04 % 603 0.05 % Total combination—interest rate reduction & other-than-insignificant delay in repayment $ 428 0.00 % $ 693 0.00 % Combination—Interest Rate Reduction & Term Extension: Business banking $ 41 0.00 % $ 551 0.05 % Consumer home equity — — % 216 0.02 % Total combination—interest rate reduction & term extension $ 41 0.00 % $ 767 0.01 % Combination—Term Extension & Other-than-Insignificant Delay in Repayment: Business banking $ — — % $ 26 0.00 % Residential real estate — — % 141 0.01 % Total combination—term extension & other-than-insignificant delay in repayment $ — — % $ 167 0.00 % Combination—Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment Business banking $ — — % $ 23 0.00 % Residential real estate — — % 83 0.00 % Total combination—interest rate reduction, term extension & other-than-insignificant delay in repayment $ — — % $ 106 0.00 % Total by portfolio segment Business banking $ 62 0.01 % $ 1,016 0.09 % Residential real estate 2,084 0.08 % 3,046 0.12 % Consumer home equity 715 0.06 % 2,944 0.25 % Total $ 2,861 0.02 % $ 7,006 0.05 % The following table describes the financial effect of the modifications made during the three months ended September 30, 2023 to borrowers experiencing financial difficulty: Loan Type Financial Effect (1) Interest Rate Reduction Business banking Reduced weighted-average contractual interest rate from 12.7% to 8.5%. Consumer home equity Reduced weighted-average contractual interest rate from 8.0% to 4.8%. Other-than-Insignificant Delay in Repayment Business banking Deferred a weighted average of 6 payments. For the principal and interest deferral, the loan was re-amortized over an extended payment period resulting in reduced monthly payment amounts for the borrower. Residential real estate Deferred a weighted average of 8 principal and interest payments which were added to the end of the loan life. Consumer home equity Deferred a weighted average of 3 principal and interest payments which were added to the end of the loan life. Term Extension Business banking Added a weighted-average 4.8 years to the life of loans, which reduced monthly payment amounts for the borrowers. (1) Loans that were modified in more than one manner are included in each modification type corresponding to the type of modifications performed. The following table describes the financial effect of the modifications made during the nine months ended September 30, 2023 to borrowers experiencing financial difficulty: Loan Type Financial Effect (1) Interest Rate Reduction Business banking Reduced weighted-average contractual interest rate from 9.8% to 7.4%. Residential real estate Reduced weighted-average contractual interest rate from 5.4% to 3.6%. Consumer home equity Reduced weighted-average contractual interest rate from 7.4% to 4.4%. Other-than-Insignificant Delay in Repayment Business banking Deferred a weighted average of 2 payments. For principal and interest deferrals, the loans were re-amortized over an extended payment period resulting in reduced monthly payment amounts for the borrowers. For interest-only deferrals, interest accrued at the time of the modification was added to the end of the loan life. Residential real estate Deferred a weighted average of 8 principal and interest payments which were added to the end of the loan life. Consumer home equity Deferred a weighted average of 7 principal and interest payments which were added to the end of the loan life. Term Extension Business banking Added a weighted-average 5.1 years to the life of loans, which reduced monthly payment amounts for the borrowers. Residential real estate Added a weighted-average 23.7 years to the life of loans, which reduced monthly payment amounts for the borrowers. Consumer home equity Added a weighted-average 17.2 years to the life of loans, which reduced monthly payment amounts for the borrowers. (1) Loans that were modified in more than one manner are included in each modification type corresponding to the type of modifications performed. The following table shows the TDR loans on accrual and non-accrual status as of December 31, 2022: TDRs on Accrual Status TDRs on Non-Accrual Status Total TDRs Number of Loans Balance of Number of Loans Balance of Number of Loans Balance of (Dollars in thousands) Commercial and industrial 2 $ 4,449 9 $ 11,317 11 $ 15,766 Business banking 11 4,124 22 2,101 33 6,225 Residential real estate 114 17,618 28 4,016 142 21,634 Consumer home equity 51 2,632 19 1,917 70 4,549 Other consumer 1 11 — — 1 11 Total 179 $ 28,834 78 $ 19,351 257 $ 48,185 The following table shows the modifications which occurred during the periods indicated and the change in the recorded investment subsequent to the modifications occurring: For the Three Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 Number Pre- Post- Number Pre-Modification Post- (Dollars in thousands) Commercial and industrial 3 $ 2,997 $ 2,997 4 $ 5,415 $ 5,415 Business banking 9 284 284 20 854 862 Residential real estate 5 1,170 1,170 8 1,899 1,899 Consumer home equity 4 1,236 1,236 6 1,468 1,468 Total 21 $ 5,687 $ 5,687 38 $ 9,636 $ 9,644 (1) The post-modification balances represent the balance of the loan on the date of modification. These amounts may show an increase when modification includes capitalization of interest. The following table shows the Company’s post-modification balance of TDRs listed by type of modification during the periods indicated: For the Three Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (In thousands) Extended maturity — 997 Adjusted interest rate and extended maturity 123 535 Interest only/principal deferred — 130 Covenant modification — 2,418 Principal and interest deferred 2,343 2,343 Extended maturity and interest only/principal deferred 2,997 2,997 Other 224 224 Total $ 5,687 $ 9,644
Summary of the age analysis of past due loans to borrowers experiencing financial difficulty	The following table shows the age analysis of past due loans to borrowers experiencing financial difficulty as of September 30, 2023 that were modified during the nine months ended September 30, 2023: As of September 30, 2023 30-59 60-89 90 or More Total Past Current Total (In thousands) Business banking $ 20 $ — $ — $ 20 $ 997 $ 1,017 Residential real estate 113 — — 113 2,933 3,046 Consumer home equity — 400 — 400 2,543 2,943 Total $ 133 $ 400 $ — $ 533 $ 6,473 $ 7,006
Summary of the Company's loan participations	The following table summarizes the Company’s loan participations: As of and for the Nine Months Ended September 30, 2023 As of and for the Year Ended December 31, 2022 Balance Non-performing Gross Balance Non-performing Gross (Dollars in thousands) Commercial and industrial $ 1,097,747 — % $ — $ 1,024,131 0.83 % $ — Commercial real estate 439,872 — % — 422,042 0.00 % — Commercial construction 135,612 — % — 96,134 0.00 % — Business banking 108 — % — 51 0.00 % 3 Total loan participations $ 1,673,339 — % $ — $ 1,542,358 0.55 % $ 3

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2023
Leases [Abstract]
Summary of Lease Cost	As of the dates indicated, the Company had the following related to operating leases: As of September 30, 2023 As of December 31, 2022 (In thousands) Right-of-use assets $ 52,727 $ 48,817 Lease liabilities 55,852 52,105 The following table is a summary of the Company’s components of net lease cost for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Operating lease cost $ 2,974 $ 3,182 $ 8,929 $ 9,670 Finance lease cost 87 77 246 231 Variable lease cost 655 577 1,993 1,914 Total lease cost $ 3,716 $ 3,836 $ 11,168 $ 11,815
Summary of Other Information Related to Leases	Supplemental balance sheet information related to operating leases are as follows: As of September 30, 2023 As of December 31, 2022 Weighted-average remaining lease term (in years) 8.51 7.26 Weighted-average discount rate 3.73 % 2.62 %
Summary of Future Minimum Lease Payments	The following table sets forth the undiscounted cash flows of base rent related to operating leases outstanding as of September 30, 2023 with payments scheduled over the next five years and thereafter, including a reconciliation to the operating lease liability recognized in other liabilities in the Company’s Consolidated Balance Sheets: As of September 30, 2023 Year (In thousands) Remainder of 2023 $ 3,167 2024 10,183 2025 7,772 2026 6,682 2027 5,543 Thereafter 33,587 Total minimum lease payments 66,934 Less: amount representing interest 11,082 Present value of future minimum lease payments $ 55,852

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	9 Months Ended
Goodwill and Other Intangibles (Tables)	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill and Other Intangible Assets	The table below sets forth the carrying amount of goodwill and other intangible assets, net of accumulated amortization, for the banking business as of the dates indicated below. The information presented within this Note excludes discontinued operations. Refer to Note 19, “Discontinued Operations” for further discussion regarding discontinued operations. As of September 30, 2023 As of December 31, 2022 (In thousands) Balances not subject to amortization Goodwill $ 557,635 $ 557,635 Balances subject to amortization Core deposit intangible (1) 9,074 10,374 Total goodwill and other intangible assets $ 566,709 $ 568,009 (1) Management performs an assessment of the remaining useful lives of the Company’s intangible assets on a quarterly basis to determine if such lives remain appropriate. As a result of the assessment performed during the second quarter of 2023, management reduced the remaining useful life of its core deposit intangible to five years which resulted in an increase in quarterly amortization expense. The effect of the increase on annual amortization expense was not material.

Earnings (Loss) Per Share ("E_2

Earnings (Loss) Per Share ("EPS") (Tables)	9 Months Ended
Earnings (Loss) Per Share ("EPS") (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings (Loss) Per Share, Basic and Diluted	For the Three Months Ended September 30, 2023 For the Nine Months Ended September 30, 2023 (Dollars in thousands, except per share data) Net income (loss) applicable to common shares: Net income (loss) from continuing operations $ 63,464 $ (94,198) Net (loss) income from discontinued operations (4,351) 7,872 Total net income (loss) $ 59,113 $ (86,326) Average number of common shares outstanding 175,832,085 175,783,313 Less: Average unallocated ESOP shares (13,461,616) (13,584,155) Average number of common shares outstanding used to calculate basic earnings (loss) per common share 162,370,469 162,199,158 Common stock equivalents 99,418 61,345 Average number of common shares outstanding used to calculate diluted earnings (loss) per common share 162,469,887 162,260,503 Basic earnings (loss) per common share: Earnings (loss) per share from continuing operations $ 0.39 $ (0.58) (Loss) earnings per share from discontinued operations (0.03) 0.05 Total basic earnings (loss) per share $ 0.36 $ (0.53) Diluted earnings (loss) per common share: Earnings (loss) per share from continuing operations $ 0.39 $ (0.58) (Loss) earnings per share from discontinued operations (0.03) 0.05 Total diluted earnings (loss) per share $ 0.36 $ (0.53) For the Three Months Ended September 30, 2022 For the Nine Months Ended September 30, 2022 (Dollars in thousands, except per share data) Net income applicable to common shares: Net income from continuing operations $ 52,808 $ 145,593 Net income from discontinued operations 1,969 11,872 Total net income $ 54,777 $ 157,465 Average number of common shares outstanding 177,677,074 180,764,479 Less: Average unallocated ESOP shares (13,958,112) (14,082,257) Average number of common shares outstanding used to calculate basic earnings per common share 163,718,962 166,682,222 Common stock equivalents 310,687 185,421 Average number of common shares outstanding used to calculate diluted earnings per common share 164,029,649 166,867,643 Basic earnings per common share: Earnings per share from continuing operations $ 0.32 $ 0.87 Earnings per share from discontinued operations 0.01 0.07 Total basic earnings per share $ 0.33 $ 0.94 Diluted earnings per common share: Earnings per share from continuing operations $ 0.32 $ 0.87 Earnings per share from discontinued operations 0.01 0.07 Total diluted earnings per share $ 0.33 $ 0.94

Low Income Housing Tax Credit_2

Low Income Housing Tax Credits and Other Tax Credit Investments (Tables)	9 Months Ended
	Sep. 30, 2023
Investments in Affordable Housing Projects [Abstract]
Summary of the Company's Investments in Low Income Housing Projects Accounted for Using the Proportional Amortization Method	The following table presents the Company’s investments in low income housing projects accounted for using the proportional amortization method for the periods indicated: As of September 30, 2023 As of December 31, 2022 (In thousands) Current recorded investment included in other assets $ 224,445 $ 128,765 Commitments to fund qualified affordable housing projects included in recorded investment noted above 159,230 84,145 The following table presents additional information related to the Company’s investments in LIHTC projects for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Tax credits and benefits recognized $ 1,602 $ 2,333 $ 8,169 $ 6,988 Amortization expense included in income tax (benefit) expense 745 1,886 6,322 5,616

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
Shareholders' Equity (Tables)	Sep. 30, 2023
Equity [Abstract]
Dividends Declared	Information regarding dividends declared and paid is presented in the following table for the periods indicated: Dividends Declared per Share Dividends Declared Dividends Paid (In millions, except per share data) Three Months Ended March 31, 2023 $ 0.10 $ 16.3 $ 16.2 Three Months Ended June 30, 2023 0.10 16.4 16.3 Three Months Ended September 30, 2023 0.10 16.4 16.2 Three Months Ended March 31, 2022 $ 0.10 $ 17.1 $ 16.9 Three Months Ended June 30, 2022 0.10 16.7 16.5 Three Months Ended September 30, 2022 0.10 16.5 16.3

Employee Benefits (Tables)

Employee Benefits (Tables)	9 Months Ended
Employee Benefits (Tables)	Sep. 30, 2023
Retirement Benefits [Abstract]
Summary of Components of Net Pension Expense	The components of net pension expense for the plans for the periods indicated are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Components of net periodic benefit cost: Service cost (1) $ 6,339 $ 8,094 $ 19,016 $ 24,278 Interest cost 4,297 2,429 12,893 7,289 Expected return on plan assets (7,532) (9,280) (22,596) (27,842) Prior service credit (2,970) (2,971) (8,910) (8,911) Recognized net actuarial loss 2,468 2,799 7,404 8,395 Net periodic benefit cost $ 2,602 $ 1,071 $ 7,807 $ 3,209 (1) Includes service costs related to employees of our insurance agency business. Such service costs were included in net (loss) income from discontinued operations as such costs will not continue to be incurred by the Company following the sale of the insurance agency business. All other costs included in the determination of the benefit obligation for the Defined Benefit Plan and the BEP were included in net income (loss) from continuing operations as the Bank will assume the related liability upon dissolution of Eastern Insurance Group following the sale of the insurance agency business. Service costs included in net (loss) income from discontinued operations and included in the above table were $1.5 million and $4.5 million for the three and nine months ended September 30, 2023, respectively, and were $1.9 million and $5.8 million for the three and nine months ended September 30, 2022, respectively.
Schedule of Assets Held in Rabbi Trust	The following table presents the book value, mark-to-market, and fair value of assets held in rabbi trust accounts by asset type: As of September 30, 2023 As of December 31, 2022 Book Value Mark-to-Market Fair Value Book Value Mark-to-Market Fair Value Asset Type (In thousands) Cash and cash equivalents $ 11,420 $ — $ 11,420 $ 5,575 $ — $ 5,575 Equities (1) 55,838 6,822 62,660 60,056 3,626 63,682 Fixed income 6,863 (705) 6,158 7,799 (770) 7,029 Total assets $ 74,121 $ 6,117 $ 80,238 $ 73,430 $ 2,856 $ 76,286 (1) Equities include mutual funds and other exchange-traded funds.

Share-Based Compensation (Table

Share-Based Compensation (Tables)	9 Months Ended
Share-Based Compensation (Tables)	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity	The following table summarizes the Company’s restricted stock award activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested restricted stock as of the beginning of the respective period 525,460 $ 20.08 683,056 $ 20.13 Granted 47,820 11.50 31,559 19.17 Vested (28,690) 19.17 — — Forfeited — — — — Non-vested restricted stock as of the end of the respective period 544,590 $ 19.37 714,615 $ 20.09 The following table summarizes the Company’s restricted stock unit activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested restricted stock units as of the beginning of the respective period 972,325 $ 21.08 — $ — Granted 318,577 15.63 978,364 21.08 Vested (1) (231,407) 21.08 — — Forfeited (3,199) 16.72 (6,039) 21.08 Non-vested restricted stock units as of the end of the respective period 1,056,296 $ 19.45 972,325 $ 21.08 (1) Includes 74,625 shares withheld upon settlement for employee taxes. The following table summarizes the Company’s performance stock unit activity for the periods indicated: For the Nine Months Ended September 30, 2023 2022 Number of Shares Weighted-Average Grant Price Per Share Number of Shares Weighted-Average Grant Price Per Share Non-vested performance stock units as of the beginning of the respective period 533,676 $ 21.12 — $ — Granted 108,984 10.16 533,676 21.12 Vested — — — — Forfeited — — — — Non-vested performance stock units as of the end of the respective period 642,660 $ 19.26 533,676 $ 21.12
Share-based Compensation Expense Under the 2021 Plan and the Related Tax Benefit	The following table shows share-based compensation expense under the 2021 Plan and the related tax benefit for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In millions) Share-based compensation expense $ 3.7 $ 3.6 $ 11.4 $ 8.1 Related tax benefit 1.0 1.0 3.2 2.3

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
Income Taxes (Tables)	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Summary of Company's Tax Provision and Applicable Tax Rates	The following table sets forth information regarding the Company’s tax provision and applicable tax rates for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (Dollars in thousands) Combined federal and state income tax (benefit) provision $ (16,178) $ 16,650 $ (65,619) $ 43,681 Effective income tax rate (34.2) % 24.0 % 41.1 % 23.1 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
Commitments and Contingencies (Tables)	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Summary of Financial Instruments as of the Dates Indicated	The following table summarizes the above financial instruments as of the dates indicated: As of September 30, 2023 As of December 31, 2022 (In thousands) Commitments to extend credit $ 5,920,300 $ 5,680,438 Standby letters of credit 54,532 65,154 Forward commitments to sell loans 8,495 10,008

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
Derivative Financial Instruments (Tables)	Sep. 30, 2023
Summary of Derivative Instruments [Abstract]
Schedule of Interest Rate Derivatives	The following tables reflect the Company’s derivative positions for interest rate swaps which qualify as cash flow hedges for accounting purposes as of the dates indicated: As of September 30, 2023 Weighted Average Rate Notional Weighted Average Current Receive Fixed Fair Value (1) (In thousands) (In Years) (In thousands) Interest rate swaps on loans $ 2,400,000 3.82 5.32 % 3.02 % $ (351) Total $ 2,400,000 $ (351) (1) The fair value included a net accrued interest payable balance of $2.5 million as of September 30, 2023. In addition, the fair value includes netting adjustments which represent the amounts recorded to convert derivative assets and liabilities cleared through the Chicago Mercantile Exchange, or CME, from a gross basis to a net basis in accordance with applicable accounting guidance. As of December 31, 2022 Weighted Average Rate Notional Weighted Average Current Receive Fixed Fair Value (1) (In thousands) (In Years) (In thousands) Interest rate swaps on loans $ 2,400,000 4.57 4.07 % 3.02 % $ (2,401) Total $ 2,400,000 $ (2,401) (1) The fair value included a net accrued interest payable balance of $1.5 million as of December 31, 2022. In addition, the fair value includes netting adjustments which represent the amounts recorded to convert derivative assets and liabilities cleared through the CME from a gross basis to a net basis in accordance with applicable accounting guidance.
Schedule of Pre-tax Impact of Terminated Cash Flow Hedges on AOCI	The following table presents the pre-tax impact of terminated cash flow hedges on AOCI for the periods indicated: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Unrealized gains on terminated hedges included in AOCI – beginning of respective period $ — $ 1,850 $ 46 $ 10,239 Unrealized gains on terminated hedges arising during the period — — — — Reclassification adjustments for amortization of unrealized gains into net income — (1,263) (46) (9,652) Unrealized gains on terminated hedges included in AOCI – end of respective period $ — $ 587 $ — $ 587
Derivatives Not Designated as Hedging Instruments	The following tables present the Company’s customer-related derivative positions as of the dates indicated below for those derivatives not designated as hedging: September 30, 2023 Number of Positions Total Notional (Dollars in thousands) Interest rate swaps 376 $ 2,478,858 Risk participation agreements 73 267,812 Foreign exchange contracts: Matched commercial customer book 92 45,145 Foreign currency loan 6 11,553 December 31, 2022 Number of Positions Total Notional (Dollars in thousands) Interest rate swaps 382 $ 2,404,003 Risk participation agreements 63 241,029 Foreign exchange contracts: Matched commercial customer book 32 7,877 Foreign currency loan 5 13,948
Schedule of Derivative Financial Instruments	The table below presents the fair value of the Company’s derivative financial instruments, as well as their classification on the Consolidated Balance Sheets for the periods indicated: Asset Derivatives Liability Derivatives Balance Fair Value at September 30, Fair Value at December 31, Balance Sheet Fair Value at September 30, Fair Value at December 31, (In thousands) Derivatives designated as hedging instruments Interest rate swaps Other assets $ 15 $ 16 Other liabilities $ 367 $ 2,417 Derivatives not designated as hedging instruments Customer-related positions: Interest rate swaps Other assets $ 25,236 $ 23,567 Other liabilities $ 92,409 $ 78,577 Risk participation agreements Other assets 47 78 Other liabilities 45 130 Foreign currency exchange contracts - matched customer book Other assets 785 198 Other liabilities 763 205 Foreign currency exchange contracts - foreign currency loan Other assets 261 2 Other liabilities 1 93 $ 26,329 $ 23,845 $ 93,218 $ 79,005 Total $ 26,344 $ 23,861 $ 93,585 $ 81,422
Schedule of Derivative Financial Instruments On The Consolidated Income Statements	The table below presents the net effect of the Company’s derivative financial instruments on the Consolidated Income Statements as well as the effect of the Company’s derivative financial instruments included in other comprehensive income (“OCI”) as follows: Three Months Ended Nine Months Ended 2023 2022 2023 2022 (In thousands) Derivatives designated as hedges: Loss in OCI on derivatives $ (29,022) $ (72,667) $ (66,168) $ (71,182) (Loss) gain reclassified from OCI into interest income (effective portion) $ (13,723) $ 3,755 $ (34,557) $ 12,797 Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test) Interest income — — — — Other income — — — — Total $ — $ — $ — $ — Derivatives not designated as hedges: Customer-related positions: Gain recognized in interest rate swap income $ 910 $ 1,035 $ 770 $ 4,760 Gain recognized in interest rate swap income for risk participation agreements 25 38 54 186 Gain (loss) recognized in other income for foreign currency exchange contracts: Matched commercial customer book 9 (1) 29 (1) Foreign currency loan 503 (136) 351 9 Total gain for derivatives not designated as hedges $ 1,447 $ 936 $ 1,204 $ 4,954

Balance Sheet Offsetting (Table

Balance Sheet Offsetting (Tables)	9 Months Ended
Balance Sheet Offsetting (Tables)	Sep. 30, 2023
Offsetting [Abstract]
Disclosure Detail Of Balance Sheet Offsetting Of Financial Assets And Liabilities	The following tables present the Company’s asset and liability positions that were eligible for offset and the potential effect of netting arrangements on its Consolidated Balance Sheet, as of the dates indicated: As of September 30, 2023 Gross Gross Net Gross Amounts Not Offset Net Description Financial Collateral (In thousands) Derivative Assets Interest rate swaps $ 15 $ — $ 15 $ — $ — $ 15 Customer-related positions: Interest rate swaps 25,236 — 25,236 321 (16,900) 8,015 Risk participation agreements 47 — 47 — — 47 Foreign currency exchange contracts – matched customer book 785 — 785 — — 785 Foreign currency exchange contracts – foreign currency loan 261 — 261 — — 261 $ 26,344 $ — $ 26,344 $ 321 $ (16,900) $ 9,123 Derivative Liabilities Interest rate swaps $ 367 $ — $ 367 $ — $ 367 $ — Customer-related positions: Interest rate swaps 92,409 — 92,409 321 — 92,088 Risk participation agreements 45 — 45 — — 45 Foreign currency exchange contracts – matched customer book 763 — 763 — — 763 Foreign currency exchange contracts – foreign currency loan 1 — 1 — — 1 $ 93,585 $ — $ 93,585 $ 321 $ 367 $ 92,897 As of December 31, 2022 Gross Gross Net Gross Amounts Not Offset Net Description Financial Collateral (In thousands) Derivative Assets Interest rate swaps $ 16 $ — $ 16 $ — $ — $ 16 Customer-related positions: Interest rate swaps 23,567 — 23,567 381 (14,430) 8,756 Risk participation agreements 78 — 78 — — 78 Foreign currency exchange contracts – matched customer book 198 — 198 — — 198 Foreign currency exchange contracts – foreign currency loan 2 — 2 — — 2 $ 23,861 $ — $ 23,861 $ 381 $ (14,430) $ 9,050 Derivative Liabilities Interest rate swaps $ 2,417 $ — $ 2,417 $ — $ 2,417 $ — Customer-related positions: Interest rate swaps 78,577 — 78,577 381 — 78,196 Risk participation agreements 130 — 130 — — 130 Foreign currency exchange contracts – matched customer book 205 — 205 — — 205 Foreign currency exchange contracts – foreign currency loan 93 — 93 — — 93 $ 81,422 $ — $ 81,422 $ 381 $ 2,417 $ 78,624

Fair Value of Assets and Liab_2

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
Fair Value of Assets and Liabilities (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Summary Of The Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis	The following tables present the balances of assets and liabilities measured at fair value on a recurring basis as of September 30, 2023 and December 31, 2022: Fair Value Measurements at Reporting Date Using Balance as of September 30, 2023 Quoted Prices in Significant Significant Description (In thousands) Assets Securities available for sale Government-sponsored residential mortgage-backed securities $ 2,700,630 $ — $ 2,700,630 $ — Government-sponsored commercial mortgage-backed securities 1,089,120 — 1,089,120 — U.S. Agency bonds 207,965 — 207,965 — U.S. Treasury securities 93,219 93,219 — — State and municipal bonds and obligations 170,584 — 170,584 — Rabbi trust investments 80,238 74,080 6,158 — Loans held for sale 23,892 — 23,892 — Interest rate swap contracts Cash flow hedges - interest rate positions 15 — 15 — Customer-related positions 25,236 — 25,236 — Risk participation agreements 47 — 47 — Foreign currency forward contracts Matched customer book 785 — 785 — Foreign currency loan 261 — 261 — Mortgage derivatives 68 — 68 — Total $ 4,392,060 $ 167,299 $ 4,224,761 $ — Liabilities Interest rate swap contracts Cash flow hedges - interest rate positions $ 367 $ — $ 367 $ — Customer-related positions 92,409 — 92,409 — Risk participation agreements 45 — 45 — Foreign currency forward contracts Matched customer book 763 — 763 — Foreign currency loan 1 — 1 — Mortgage derivatives 118 — 118 — Total $ 93,703 $ — $ 93,703 $ — Fair Value Measurements at Reporting Date Using Description Balance as of December 31, 2022 Quoted Prices in Significant Significant (In thousands) Assets Securities available for sale Government-sponsored residential mortgage-backed securities $ 4,111,908 $ — $ 4,111,908 $ — Government-sponsored commercial mortgage-backed securities 1,348,954 — 1,348,954 — U.S. Agency bonds 952,482 — 952,482 — U.S. Treasury securities 93,057 93,057 — — State and municipal bonds and obligations 183,092 — 183,092 — Other debt securities 1,285 — 1,285 — Rabbi trust investments 76,286 69,257 7,029 — Loans held for sale 4,543 — 4,543 — Interest rate swap contracts Cash flow hedges - interest rate positions 16 — 16 — Customer-related positions 23,567 — 23,567 — Risk participation agreements 78 — 78 — Foreign currency forward contracts Matched customer book 198 — 198 — Foreign currency loan 2 — 2 — Mortgage derivatives 62 — 62 — Total $ 6,795,530 $ 162,314 $ 6,633,216 $ — Liabilities Interest rate swap contracts Cash flow hedges - interest rate positions $ 2,417 $ — $ 2,417 $ — Customer-related positions 78,577 — 78,577 — Risk participation agreements 130 — 130 — Foreign currency forward contracts Matched customer book 205 — 205 — Foreign currency loan 93 — 93 — Mortgage derivatives 58 — 58 — Total $ 81,480 $ — $ 81,480 $ —
Summary Of The Fair Value Of Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis	The following tables summarize the fair value of assets and liabilities measured at fair value on a nonrecurring basis, as of September 30, 2023 and December 31, 2022. Fair Value Measurements at Reporting Date Using Description Balance as of September 30, 2023 Quoted Prices Significant Significant (In thousands) Assets Individually assessed collateral-dependent loans whose fair value is based upon appraisals $ 18,105 $ — $ — $ 18,105 Fair Value Measurements at Reporting Date Using Description Balance as of December 31, 2022 Quoted Prices Significant Significant (In thousands) Assets Collateral-dependent impaired loans whose fair value is based upon appraisals $ 16,432 $ — $ — $ 16,432
Fair Value, by Balance Sheet Grouping	The estimated fair values and related carrying amounts for assets and liabilities for which fair value is only disclosed are shown below as of the dates indicated: Fair Value Measurements at Reporting Date Using Description Carrying Value as of September 30, 2023 Fair Value as of September 30, 2023 Quoted Prices Significant Significant (In thousands) Assets Held to maturity securities: Government-sponsored residential mortgage-backed securities $ 260,271 $ 219,548 $ — $ 219,548 $ — Government-sponsored commercial mortgage-backed securities 195,629 168,106 — 168,106 — Loans, net of allowance for loan losses 13,744,822 13,099,665 — — 13,099,665 FHLB stock 37,125 37,125 — 37,125 — Bank-owned life insurance 163,700 163,700 — 163,700 — Liabilities Deposits $ 17,424,169 $ 17,412,731 $ — $ 17,412,731 $ — FHLB advances 673,525 670,747 — 670,747 — Escrow deposits of borrowers 24,947 24,947 — 24,947 — Interest rate swap collateral funds 16,900 16,900 — 16,900 — Fair Value Measurements at Reporting Date Using Description Carrying Value as of December 31, 2022 Fair Value as of December 31, 2022 Quoted Prices Significant Significant (In thousands) Assets Held to maturity securities: Government-sponsored residential mortgage-backed securities $ 276,493 $ 246,343 $ — $ 246,343 $ — Government-sponsored commercial mortgage-backed securities 200,154 176,883 — 176,883 — Loans, net of allowance for loan losses 13,420,317 13,149,096 — — 13,149,096 FHLB stock 41,363 41,363 — 41,363 — Bank-owned life insurance 160,790 160,790 — 160,790 — Liabilities Deposits $ 18,974,359 $ 18,960,407 $ — $ 18,960,407 $ — FHLB advances 704,084 702,954 — 702,954 — Escrow deposits of borrowers 22,314 22,314 — 22,314 — Interest rate swap collateral funds 14,430 14,430 — 14,430 —

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
Revenue from Contracts with Customers (Tables)	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from External Customers by Products and Services	A portion of the Company's noninterest income/(loss) is derived from contracts with customers within the scope of ASC 606. The Company has disaggregated such revenues by type of service, as presented in the table below. These categories reflect how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Service charges on deposit accounts $ 7,403 $ 6,708 $ 21,117 $ 23,558 Trust and investment advisory fees 6,235 5,832 18,136 17,967 Debit card processing fees 3,388 3,249 10,071 9,417 Other noninterest income 2,548 2,728 7,723 8,067 Total noninterest income in-scope of ASC 606 19,574 18,517 57,047 59,009 Total noninterest (loss) income out-of-scope of ASC 606 (417) 1,007 (321,539) (4,684) Total noninterest income (loss) $ 19,157 $ 19,524 $ (264,492) $ 54,325

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	9 Months Ended
Other Comprehensive Income (Tables)	Sep. 30, 2023
Statement of Other Comprehensive Income [Abstract]
Comprehensive Income (Loss)	The following tables present a reconciliation of the changes in the components of other comprehensive (loss) income for the dates indicated including the amount of income tax (expense) benefit allocated to each component of other comprehensive (loss) income: Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Pre Tax Tax After Tax Pre Tax Tax After Tax (In thousands) Unrealized losses on securities available for sale: Change in fair value of securities available for sale $ (157,750) $ 40,490 $ (117,260) $ (194,259) $ 52,004 $ (142,255) Less: reclassification adjustment for losses included in net income — — — (333,170) 74,630 (258,540) Net change in fair value of securities available for sale (157,750) 40,490 (117,260) 138,911 (22,626) 116,285 Unrealized losses on cash flow hedges: Change in fair value of cash flow hedges (29,022) 8,193 (20,829) (66,168) 19,795 (46,373) Less: net cash flow hedge losses reclassified into interest income (1) (13,723) 3,874 (9,849) (34,557) 9,757 (24,800) Net change in fair value of cash flow hedges (15,299) 4,319 (10,980) (31,611) 10,038 (21,573) Defined benefit pension plans: Change in actuarial net loss — — — — — — Less: amortization of actuarial net loss (2,468) 697 (1,771) (7,404) 2,091 (5,313) Less: accretion of prior service credit 2,970 (839) 2,131 8,910 (2,495) 6,415 Net change in other comprehensive income for defined benefit postretirement plans (502) 142 (360) (1,506) 404 (1,102) Total other comprehensive (loss) income $ (173,551) $ 44,951 $ (128,600) $ 105,794 $ (12,184) $ 93,610 (1) Includes amortization of realized gains of less than $0.1 million on terminated cash flow hedges for the nine months ended September 30, 2023. The total original gain of $41.2 million, net of tax, became fully accreted into income during the nine months ended September 30, 2023. Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Pre Tax Tax After Tax Pre Tax Tax After Tax (In thousands) Unrealized losses on securities available for sale: Change in fair value of securities available for sale $ (337,762) $ 76,107 $ (261,655) $ (1,111,187) $ 249,158 $ (862,029) Less: reclassification adjustment for losses included in net income (198) 12 (186) (2,474) 714 (1,760) Net change in fair value of securities available for sale (337,564) 76,095 (261,469) (1,108,713) 248,444 (860,269) Unrealized losses on cash flow hedges: Change in fair value of cash flow hedges (72,667) 19,304 (53,363) (71,182) 18,899 (52,283) Less: net cash flow hedge gains reclassified into interest income (1) 3,755 (1,056) 2,699 12,797 (3,598) 9,199 Net change in fair value of cash flow hedges (76,422) 20,360 (56,062) (83,979) 22,497 (61,482) Defined benefit pension plans: Change in actuarial net loss — — — — — — Less: amortization of actuarial net loss (2,799) 787 (2,012) (8,395) 2,360 (6,035) Less: accretion of prior service credit 2,971 (835) 2,136 8,911 (2,505) 6,406 Net change in other comprehensive income for defined benefit postretirement plans (172) 48 (124) (516) 145 (371) Total other comprehensive loss $ (414,158) $ 96,503 $ (317,655) $ (1,193,208) $ 271,086 $ (922,122) (1) Includes amortization of realized gains on terminated cash flow hedges for the three and nine months ended September 30, 2022. The total realized gain of $41.2 million, net of tax, was fully recognized in earnings in the first quarter of 2023. The balance of this gain had amortized to $0.4 million, net of tax, at September 30, 2022.
Schedule of Accumulated Other Comprehensive Loss	The following table illustrates the changes in the balances of each component of accumulated other comprehensive loss, net of tax: Unrealized Unrealized Defined Benefit Total (In thousands) Beginning Balance: January 1, 2023 $ (880,156) $ (50,159) $ 7,123 $ (923,192) Other comprehensive loss before reclassifications (142,255) (46,373) — (188,628) Less: Amounts reclassified from accumulated other comprehensive loss (258,540) (24,800) 1,102 (282,238) Net current-period other comprehensive income (loss) 116,285 (21,573) (1,102) 93,610 Ending Balance: September 30, 2023 $ (763,871) $ (71,732) $ 6,021 $ (829,582) Beginning Balance: January 1, 2022 $ (58,586) $ 7,361 $ (5,471) $ (56,696) Other comprehensive loss before reclassifications (862,029) (52,283) — (914,312) Less: Amounts reclassified from accumulated other comprehensive loss (1,760) 9,199 371 7,810 Net current-period other comprehensive loss (860,269) (61,482) (371) (922,122) Ending Balance: September 30, 2022 $ (918,855) $ (54,121) $ (5,842) $ (978,818)

Discontinued Operations (Tables

Discontinued Operations (Tables)	9 Months Ended
Discontinued Operations (Tables)	Sep. 30, 2023
Discontinued Operations and Disposal Groups [Abstract]
Summary of the Asset and Liabilities of the Discontinued Insurance Agency Business	The following is a summary of the assets and liabilities of the discontinued insurance agency business as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (In thousands) Assets Premises and equipment $ 50 $ 163 Goodwill and intangibles, net 91,115 93,117 Deferred income taxes, net (187) (315) Prepaid expenses 476 532 Other assets 33,264 34,722 Total assets $ 124,718 $ 128,219 Liabilities Other liabilities $ 34,820 $ 34,930 Total liabilities $ 34,820 $ 34,930 September 30, 2023 December 31, 2022 (In thousands) Assets Cash $ 77,852 $ 66,507 Premises and equipment (1) 1,776 1,792 Bank-owned life insurance 2,109 2,066 Deferred income taxes 3,457 3,662 Other assets (2) 11,187 12,944 Total assets $ 96,381 $ 86,971 Liabilities Other liabilities (3) $ 12,166 $ 14,013 Total liabilities $ 12,166 $ 14,013 (1) Includes buildings and related improvements. (2) Primarily includes assets held in rabbi trusts and the ROU asset associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. (3) Primarily includes employee post-retirement liabilities and the lease liability associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. The following presents operating results of the discontinued insurance agency business for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: Insurance commissions $ 25,897 $ 23,926 $ 85,177 $ 77,511 Other noninterest income 13 41 51 137 Total noninterest income 25,910 23,967 85,228 77,648 Noninterest expense: Salaries and employee benefits 24,655 16,768 57,991 49,057 Office occupancy and equipment 2,755 823 4,279 2,401 Data processing 1,013 1,052 3,216 3,248 Professional services 1,291 549 2,615 738 Marketing expenses 53 101 152 182 Amortization of intangible assets 665 734 2,002 1,868 Other 1,514 1,186 3,976 3,613 Total noninterest expense 31,946 21,213 74,231 61,107 (Loss) income from discontinued operations before income tax expense (6,036) 2,754 10,997 16,541 Income tax (benefit) expense (1,685) 785 3,125 4,669 (Loss) income from discontinued operations, net of taxes $ (4,351) $ 1,969 $ 7,872 $ 11,872 Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: (Losses) income from investments held in rabbi trusts $ (91) $ (266) $ 489 $ (1,634) Other noninterest income (1) 15 14 44 40 Total noninterest (loss) income (76) (252) 533 (1,594) Noninterest expense: Salaries and employee benefits (2) (96) (268) 484 (1,616) Office occupancy and equipment (3) 102 125 343 375 Other (4) 474 129 1,468 320 Total noninterest expense 480 (14) 2,295 (921) Loss before income tax expense (556) (238) (1,762) (673) Income tax benefit (156) (67) (495) (189) Net loss (400) (171) (1,267) (484) (1) Includes income on Company-owned life insurance policies which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (2) Includes expenses, which were a net credit, associated with certain employee post-retirement benefit plan expenses. (3) Includes depreciation expense associated with buildings and related improvements and ROU asset amortization related to one lease which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (4) Includes intercompany expenses and other expenses associated with the Defined Benefit Plan and BEP.
Summary of the Operating Results of the Discontinued Insurance Agency Business	The following is a summary of the assets and liabilities of the discontinued insurance agency business as of September 30, 2023 and December 31, 2022: September 30, 2023 December 31, 2022 (In thousands) Assets Premises and equipment $ 50 $ 163 Goodwill and intangibles, net 91,115 93,117 Deferred income taxes, net (187) (315) Prepaid expenses 476 532 Other assets 33,264 34,722 Total assets $ 124,718 $ 128,219 Liabilities Other liabilities $ 34,820 $ 34,930 Total liabilities $ 34,820 $ 34,930 September 30, 2023 December 31, 2022 (In thousands) Assets Cash $ 77,852 $ 66,507 Premises and equipment (1) 1,776 1,792 Bank-owned life insurance 2,109 2,066 Deferred income taxes 3,457 3,662 Other assets (2) 11,187 12,944 Total assets $ 96,381 $ 86,971 Liabilities Other liabilities (3) $ 12,166 $ 14,013 Total liabilities $ 12,166 $ 14,013 (1) Includes buildings and related improvements. (2) Primarily includes assets held in rabbi trusts and the ROU asset associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. (3) Primarily includes employee post-retirement liabilities and the lease liability associated with one lease which will be assumed by the Bank upon dissolution of Eastern Insurance Group following the sale. The following presents operating results of the discontinued insurance agency business for the three and nine months ended September 30, 2023 and 2022: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: Insurance commissions $ 25,897 $ 23,926 $ 85,177 $ 77,511 Other noninterest income 13 41 51 137 Total noninterest income 25,910 23,967 85,228 77,648 Noninterest expense: Salaries and employee benefits 24,655 16,768 57,991 49,057 Office occupancy and equipment 2,755 823 4,279 2,401 Data processing 1,013 1,052 3,216 3,248 Professional services 1,291 549 2,615 738 Marketing expenses 53 101 152 182 Amortization of intangible assets 665 734 2,002 1,868 Other 1,514 1,186 3,976 3,613 Total noninterest expense 31,946 21,213 74,231 61,107 (Loss) income from discontinued operations before income tax expense (6,036) 2,754 10,997 16,541 Income tax (benefit) expense (1,685) 785 3,125 4,669 (Loss) income from discontinued operations, net of taxes $ (4,351) $ 1,969 $ 7,872 $ 11,872 Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 (In thousands) Noninterest income: (Losses) income from investments held in rabbi trusts $ (91) $ (266) $ 489 $ (1,634) Other noninterest income (1) 15 14 44 40 Total noninterest (loss) income (76) (252) 533 (1,594) Noninterest expense: Salaries and employee benefits (2) (96) (268) 484 (1,616) Office occupancy and equipment (3) 102 125 343 375 Other (4) 474 129 1,468 320 Total noninterest expense 480 (14) 2,295 (921) Loss before income tax expense (556) (238) (1,762) (673) Income tax benefit (156) (67) (495) (189) Net loss (400) (171) (1,267) (484) (1) Includes income on Company-owned life insurance policies which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (2) Includes expenses, which were a net credit, associated with certain employee post-retirement benefit plan expenses. (3) Includes depreciation expense associated with buildings and related improvements and ROU asset amortization related to one lease which will not be disposed of and will be transferred into the Bank upon dissolution of Eastern Insurance Group following the sale. (4) Includes intercompany expenses and other expenses associated with the Defined Benefit Plan and BEP.

Securities - Summary Of Debt Se

Securities - Summary Of Debt Securities (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 5,257,264,000	$ 7,825,435,000
Unrealized Gains	0	9,000
Unrealized Losses	(995,746,000)	(1,134,666,000)
Allowance for Credit Losses	0	0	$ 0
Fair Value	4,261,518,000	6,690,778,000
Government-sponsored residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,380,463,000	4,855,763,000
Unrealized Gains	0	0
Unrealized Losses	(679,833,000)	(743,855,000)
Allowance for Credit Losses	0	0
Fair Value	2,700,630,000	4,111,908,000
Government-sponsored commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,343,187,000	1,570,119,000
Unrealized Gains	0	0
Unrealized Losses	(254,067,000)	(221,165,000)
Allowance for Credit Losses	0	0
Fair Value	1,089,120,000	1,348,954,000
U.S. Agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	236,149,000	1,100,891,000
Unrealized Gains	0	0
Unrealized Losses	(28,184,000)	(148,409,000)
Allowance for Credit Losses	0	0
Fair Value	207,965,000	952,482,000
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99,494,000	99,324,000
Unrealized Gains	0	0
Unrealized Losses	(6,275,000)	(6,267,000)
Allowance for Credit Losses	0	0
Fair Value	93,219,000	93,057,000
State and municipal bonds and obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	197,971,000	198,039,000
Unrealized Gains	0	9,000
Unrealized Losses	(27,387,000)	(14,956,000)
Allowance for Credit Losses	0	0
Fair Value	$ 170,584,000	183,092,000
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1,299,000
Unrealized Gains		0
Unrealized Losses		(14,000)
Allowance for Credit Losses		0
Fair Value		$ 1,285,000

Securities - Additional Informa

Securities - Additional Information (Details)	3 Months Ended		9 Months Ended
Securities - Additional Information (Details)	Sep. 30, 2023 USD ($) holding	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) holding	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) holding
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest	$ 0	$ 0	$ 0	$ 0	$ 0
Debt securities, available-for-sale, accrued interest, after allowance for credit loss	9,700,000		9,700,000		$ 12,900,000
Debt securities, available-for-sale, accrued interest writeoff	$ 0	0	$ 0	0
Number of securities in an unrealized loss position \| holding	783		783		802
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest	$ 0	0	$ 0	0	$ 0
Debt securities, held-to-maturity, accrued interest, after allowance for credit loss	1,000,000		1,000,000		1,000,000
Debt securities, held-to-maturity, accrued interest, writeoff	0	$ 0	0	$ 0
Deposit liabilities, collateral issued, financial instruments	429,000,000		429,000,000		437,900,000
Other debt securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, available-for-sale, allowance for credit loss, excluding accrued interest					$ 0
Number of securities in an unrealized loss position \| holding					2
Foreign Debt Securities
Debt Securities, Available-for-sale [Line Items]
Number of securities in an unrealized loss position \| holding					2
Bank Term Funding Program
Debt Securities, Available-for-sale [Line Items]
Deposit liabilities, collateral issued, financial instruments	2,500,000,000		2,500,000,000		$ 0
Federal Reserve Discount Window
Debt Securities, Available-for-sale [Line Items]
Deposit liabilities, collateral issued, financial instruments	$ 370,300,000		$ 370,300,000		$ 0

Securities - Schedule of Realiz

Securities - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Securities [Abstract]
Gross realized gains from sales of AFS securities	$ 0	$ 725	$ 0	$ 1,770
Gross realized losses from sales of AFS securities	0	(923)	(333,170)	(4,244)
Net (losses) gains from sales of AFS securities	$ 0	$ (198)	$ (333,170)	$ (2,474)

Securities - Summary Of Governm

Securities - Summary Of Government-Sponsored Residential Mortgage-Backed Securities With Gross Unrealized Losses (Details) $ in Thousands	Sep. 30, 2023 USD ($) holding	Dec. 31, 2022 USD ($) holding
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	783	802
Gross Unrealized Losses
Less than 12 Months	$ 5,320	$ 98,038
12 Months or Longer	990,426	1,036,628
Total	995,746	1,134,666
Fair Value
Less than 12 Months	53,122	968,376
12 Months or Longer	4,208,396	5,719,149
Total	$ 4,261,518	$ 6,687,525
Government-sponsored residential mortgage-backed securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	324	322
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 42,196
12 Months or Longer	679,833	701,659
Total	679,833	743,855
Fair Value
Less than 12 Months	0	435,690
12 Months or Longer	2,700,630	3,676,218
Total	$ 2,700,630	$ 4,111,908
Government-sponsored commercial mortgage-backed securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	188	199
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 38,944
12 Months or Longer	254,067	182,221
Total	254,067	221,165
Fair Value
Less than 12 Months	0	300,476
12 Months or Longer	1,089,120	1,048,478
Total	$ 1,089,120	$ 1,348,954
U.S. Agency bonds
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	23	37
Gross Unrealized Losses
Less than 12 Months	$ 0	$ 645
12 Months or Longer	28,184	147,764
Total	28,184	148,409
Fair Value
Less than 12 Months	0	4,145
12 Months or Longer	207,965	948,337
Total	$ 207,965	$ 952,482
U.S. Treasury securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	6	5
Gross Unrealized Losses
Less than 12 Months	$ 104	$ 1,311
12 Months or Longer	6,171	4,956
Total	6,275	6,267
Fair Value
Less than 12 Months	4,854	48,451
12 Months or Longer	88,365	44,606
Total	$ 93,219	$ 93,057
State and municipal bonds and obligations
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding	242	237
Gross Unrealized Losses
Less than 12 Months	$ 5,216	$ 14,942
12 Months or Longer	22,171	14
Total	27,387	14,956
Fair Value
Less than 12 Months	48,268	179,614
12 Months or Longer	122,316	225
Total	$ 170,584	$ 179,839
Other debt securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Number of holdings \| holding		2
Gross Unrealized Losses
Less than 12 Months		$ 0
12 Months or Longer		14
Total		14
Fair Value
Less than 12 Months		0
12 Months or Longer		1,285
Total		$ 1,285

Securities - Debt Securities, H

Securities - Debt Securities, Held-to-maturity (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	$ 455,900,000	$ 476,647,000
Unrealized Gains	0	0
Unrealized Losses	(68,246,000)	(53,421,000)
Allowance for Credit Losses	0	0	$ 0
Fair Value	387,654,000	423,226,000
Government-sponsored residential mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	260,271,000	276,493,000
Unrealized Gains	0	0
Unrealized Losses	(40,723,000)	(30,150,000)
Allowance for Credit Losses	0	0
Fair Value	219,548,000	246,343,000
Government-sponsored commercial mortgage-backed securities
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	195,629,000	200,154,000
Unrealized Gains	0	0
Unrealized Losses	(27,523,000)	(23,271,000)
Allowance for Credit Losses	0	0
Fair Value	$ 168,106,000	$ 176,883,000

Securities - Summary Of Fair Va

Securities - Summary Of Fair Value Of Available For Sale Securities By Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
AFS securities
Due in one year or less, Amortized Cost	$ 210	$ 1,512
Due in one year or less, Fair value	210	1,494
Due after one year to five years, Amortized Cost	547,133	1,211,778
Due after one year to five years, Fair value	492,216	1,074,080
Due after five to ten years, Amortized Cost	556,573	1,643,641
Due after five to ten years, Fair value	470,867	1,430,761
Due after ten years, Amortized Cost	4,153,348	4,968,504
Due after ten years, Fair value	3,298,225	4,184,443
Amortized Cost	5,257,264	7,825,435
Fair Value	4,261,518	6,690,778
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	0	0
Due after one year to five years, Fair value	0	0
Due after five to ten years, Amortized Cost	195,629	200,154
Due after five to ten years, Fair value	168,106	176,883
Due after ten years, Amortized Cost	260,271	276,493
Due after ten years, Fair value	219,548	246,343
Amortized Cost	455,900	476,647
Fair Value	387,654	423,226
Total
Due in one year or less, Amortized Cost	210	1,512
Due in one year or less, Fair value	210	1,494
Due after one year to five years, Amortized Cost	547,133	1,211,778
Due after one year to five years, Fair value	492,216	1,074,080
Due after five to ten years, Amortized Cost	752,202	1,843,795
Due after five to ten years, Fair value	638,973	1,607,644
Due after ten years, Amortized Cost	4,413,619	5,244,997
Due after ten years, Fair value	3,517,773	4,430,786
Amortized Cost	5,713,164	8,302,082
Fair Value	4,649,172	7,114,004
Government-sponsored residential mortgage-backed securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	27,697	21,221
Due after one year to five years, Fair value	26,351	20,284
Due after five to ten years, Amortized Cost	28,637	727,908
Due after five to ten years, Fair value	26,316	648,132
Due after ten years, Amortized Cost	3,324,129	4,106,634
Due after ten years, Fair value	2,647,963	3,443,492
Amortized Cost	3,380,463	4,855,763
Fair Value	2,700,630	4,111,908
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	0	0
Due after one year to five years, Fair value	0	0
Due after five to ten years, Amortized Cost	0	0
Due after five to ten years, Fair value	0	0
Due after ten years, Amortized Cost	260,271	276,493
Due after ten years, Fair value	219,548	246,343
Amortized Cost	260,271	276,493
Fair Value	219,548	246,343
Government-sponsored commercial mortgage-backed securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	164,329	191,762
Due after one year to five years, Fair value	145,815	171,992
Due after five to ten years, Amortized Cost	475,624	649,659
Due after five to ten years, Fair value	398,011	556,641
Due after ten years, Amortized Cost	703,234	728,698
Due after ten years, Fair value	545,294	620,321
Amortized Cost	1,343,187	1,570,119
Fair Value	1,089,120	1,348,954
HTM securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	0	0
Due after one year to five years, Fair value	0	0
Due after five to ten years, Amortized Cost	195,629	200,154
Due after five to ten years, Fair value	168,106	176,883
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	195,629	200,154
Fair Value	168,106	176,883
U.S. Agency bonds
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	226,493	877,371
Due after one year to five years, Fair value	199,833	767,464
Due after five to ten years, Amortized Cost	9,656	223,520
Due after five to ten years, Fair value	8,132	185,018
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	236,149	1,100,891
Fair Value	207,965	952,482
U.S. Treasury securities
AFS securities
Due in one year or less, Amortized Cost	0	0
Due in one year or less, Fair value	0	0
Due after one year to five years, Amortized Cost	99,494	99,324
Due after one year to five years, Fair value	93,219	93,057
Due after five to ten years, Amortized Cost	0	0
Due after five to ten years, Fair value	0	0
Due after ten years, Amortized Cost	0	0
Due after ten years, Fair value	0	0
Amortized Cost	99,494	99,324
Fair Value	93,219	93,057
State and municipal bonds and obligations
AFS securities
Due in one year or less, Amortized Cost	210	213
Due in one year or less, Fair value	210	209
Due after one year to five years, Amortized Cost	29,120	22,100
Due after one year to five years, Fair value	26,998	21,283
Due after five to ten years, Amortized Cost	42,656	42,554
Due after five to ten years, Fair value	38,408	40,970
Due after ten years, Amortized Cost	125,985	133,172
Due after ten years, Fair value	104,968	120,630
Amortized Cost	197,971	198,039
Fair Value	$ 170,584	183,092
Other debt securities
AFS securities
Due in one year or less, Amortized Cost		1,299
Due in one year or less, Fair value		1,285
Due after one year to five years, Amortized Cost		0
Due after one year to five years, Fair value		0
Due after five to ten years, Amortized Cost		0
Due after five to ten years, Fair value		0
Due after ten years, Amortized Cost		0
Due after ten years, Fair value		0
Amortized Cost		1,299
Fair Value		$ 1,285

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses - Summary of Company's Loan Portfolio as of the Dates Indicated (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	$ 13,919,275		$ 13,575,531
Allowance for loan losses	(155,146)	$ (147,955)	(142,211)	$ (131,663)	$ (125,531)	$ (97,787)
Unamortized premiums, net of unearned discounts and deferred fees	(19,307)		(13,003)
Net loans	13,744,822		13,420,317
Financing receivable, accrued interest, before allowance for credit loss	50,800		45,200
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	3,087,509		3,150,946
Allowance for loan losses	(26,518)	(29,535)	(26,859)	(26,841)	(25,852)	(18,018)
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	5,396,912		5,155,323
Allowance for loan losses	(70,623)	(59,524)	(54,730)	(51,103)	(47,555)	(52,373)
Commercial construction \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	382,615		336,276
Allowance for loan losses	(7,799)	(7,663)	(7,085)	(5,981)	(5,474)	(2,585)
Business banking \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	1,087,799		1,090,492
Allowance for loan losses	(15,218)	(15,228)	(16,189)	(16,262)	(16,699)	(10,983)
Residential real estate \| Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	2,550,861		2,460,849
Allowance for loan losses	(26,355)	(27,012)	(28,129)	(23,007)	(21,663)	(6,556)
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	1,193,859		1,187,547
Allowance for loan losses	(5,482)	(6,044)	(6,454)	(5,842)	(5,662)	(3,722)
Other Consumer \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	219,720		194,098
Allowance for loan losses	(3,151)	$ (2,949)	(2,765)	$ (2,627)	$ (2,626)	$ (3,308)
Automobile Loan \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	8,100		18,100
Home Improvement Loans \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Gross loans before unamortized premiums, unearned discounts and deferred fees	$ 161,200		$ 121,100

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses - Additional Information (Details)			3 Months Ended		9 Months Ended
		Sep. 30, 2023 USD ($) loan	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) loan	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Jan. 01, 2022 USD ($)	Dec. 31, 2021 USD ($)
Changes in lines of credit,resrticted to commercial exposure
Loan syndications, amount		$ 100,000,000	$ 100,000,000		$ 100,000,000
Financing receivable, excluding accrued interest, after allowance for credit loss		13,744,822,000	13,744,822,000		13,744,822,000			$ 13,420,317,000
Debt, long-term and short-term, combined amount		715,372,000	715,372,000		715,372,000			740,828,000
Mortgage loans partially or wholly-owned by others and serviced by the Company		78,800,000	78,800,000		78,800,000			84,000,000
Loan purchases			0	$ 79,900,000	32,000,000	$ 79,900,000
Proceeds from sales of commercial loans					189,296,000	0
Realized loss on sales of commercial loans	[1]				(2,505,000)	0
Financing receivable, allowance for credit loss, excluding accrued interest		155,146,000	155,146,000	131,663,000	$ 155,146,000	131,663,000	$ 147,955,000	142,211,000	$ 125,531,000		$ 97,787,000
Maximum number of days required for special mention					90 days
Outstanding recorded investment of loans that were new to troubled debt restructuring								11,000,000
Amount of specific reserve associated with the TDR								1,800,000
Amounts charged-off on TDRs						0
Federal Home Loan Bank Advances \| Asset Pledged as Collateral
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, excluding accrued interest, after allowance for credit loss		4,200,000,000	4,200,000,000		$ 4,200,000,000			3,900,000,000
Federal Reserve Bank Advances \| Asset Pledged as Collateral
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, excluding accrued interest, after allowance for credit loss		1,100,000,000	1,100,000,000		1,100,000,000			1,100,000,000
Residential Real Estate
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, collateral dependent loans		900,000	900,000		900,000			600,000
Commercial Portfolio Segment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, collateral dependent loans		27,800,000	27,800,000		27,800,000			16,200,000
Cumulative effect accounting adjustment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest								(1,143,000)			27,086,000
Unfunded Loan Commitment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest		14,900,000	14,900,000		14,900,000			13,200,000		$ 11,100,000
Unfunded Loan Commitment \| Cumulative effect accounting adjustment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest										$ 1,000,000
Residential real estate \| Residential Real Estate
Changes in lines of credit,resrticted to commercial exposure
Amortized cost of loans purchased		391,700,000	391,700,000		391,700,000			376,100,000
Financing receivable, allowance for credit loss, excluding accrued interest		$ 26,355,000	$ 26,355,000	23,007,000	$ 26,355,000	23,007,000	27,012,000	$ 28,129,000	21,663,000		6,556,000
Number of loans in process of foreclosure \| loan		1	1		1			0
Mortgage loans in process of foreclosure, amount		$ 100,000	$ 100,000		$ 100,000
Residential real estate \| Cumulative effect accounting adjustment \| Residential Real Estate
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest								$ (849,000)			13,489,000
Consumer home equity \| Consumer Portfolio Segment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest		$ 5,482,000	$ 5,482,000	5,842,000	$ 5,482,000	5,842,000	6,044,000	$ 6,454,000	5,662,000		3,722,000
Number of loans in process of foreclosure \| loan		3	3		3			0
Mortgage loans in process of foreclosure, amount		$ 400,000	$ 400,000		$ 400,000
Consumer home equity \| Cumulative effect accounting adjustment \| Consumer Portfolio Segment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest								$ (201,000)			1,857,000
Commercial and industrial \| Commercial Portfolio Segment
Changes in lines of credit,resrticted to commercial exposure
Proceeds from sales of commercial loans			191,800,000		191,800,000
Realized loss on sales of commercial loans			$ 2,500,000		$ 2,500,000
Number of loans transferred to held-for-sale \| loan		1	1		1
Financing receivable, transfer to held-for-sale		$ 22,400,000
Transfer to held-for-sale, loss		200,000
Financing receivable, allowance for credit loss, excluding accrued interest		26,518,000	$ 26,518,000	$ 26,841,000	$ 26,518,000	$ 26,841,000	$ 29,535,000	26,859,000	$ 25,852,000		18,018,000
Commercial and industrial \| Cumulative effect accounting adjustment \| Commercial Portfolio Segment
Changes in lines of credit,resrticted to commercial exposure
Financing receivable, allowance for credit loss, excluding accrued interest								47,000			$ 11,533,000
Federal Home Loan Bank Advances
Changes in lines of credit,resrticted to commercial exposure
Advance from Federal Home Loan Bank		673,500,000	673,500,000		673,500,000			704,100,000
Federal Reserve Bank Advances
Changes in lines of credit,resrticted to commercial exposure
Debt, long-term and short-term, combined amount		0	0		0			$ 0
Unrated \| Minimum
Changes in lines of credit,resrticted to commercial exposure
Lines of credit, exposure		100,000	100,000		100,000
Unrated \| Line of Credit \| Commercial Portfolio Segment \| Maximum
Changes in lines of credit,resrticted to commercial exposure
Lines of credit, exposure		1,500,000	1,500,000		1,500,000
Unrated \| Line of Credit \| Business Banking \| Commercial Portfolio Segment \| Maximum
Changes in lines of credit,resrticted to commercial exposure
Lines of credit, exposure		$ 1,500,000	$ 1,500,000		$ 1,500,000

[1]Excludes the mark-to-market adjustment related to one commercial and industrial loan transferred to held for sale during the nine months ended September 30, 2023 which is included in the change in loans held for sale.

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses - Summary of Changes in Allowance for Loan Losses by Loan Category (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 97,787	$ 147,955	$ 125,531	$ 142,211	$ 97,787
Charge-offs		(1,045)	(983)	(2,801)	(3,689)
Recoveries		908	635	2,025	3,434
Provision (release)		7,328	6,480	14,854	7,045
Ending balance		155,146	131,663	155,146	131,663
Allowance for loan losses		155,146	131,663	155,146	131,663
Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	27,086			(1,143)	27,086
Allowance for loan losses
Cumulative effect accounting adjustment \| Accounting Standards Update 2022-02
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance				(1,100)
Allowance for loan losses
Cumulative effect accounting adjustment \| Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	27,100				27,100
Allowance for loan losses
PCI loan balances to PCD and the associated gross-up	100
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	18,018	29,535	25,852	26,859	18,018
Charge-offs		(11)	(11)	(11)	(13)
Recoveries		120	126	285	1,074
Provision (release)		(3,126)	874	(662)	(3,771)
Ending balance		26,518	26,841	26,518	26,841
Allowance for loan losses		26,518	26,841	26,518	26,841
Commercial and industrial \| Commercial Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	11,533			47	11,533
Allowance for loan losses
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	52,373	59,524	47,555	54,730	52,373
Charge-offs		0	0	0	0
Recoveries		2	3	8	53
Provision (release)		11,097	3,545	15,885	5,332
Ending balance		70,623	51,103	70,623	51,103
Allowance for loan losses		70,623	51,103	70,623	51,103
Commercial real estate \| Commercial Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(6,655)			0	(6,655)
Allowance for loan losses
Commercial construction \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,585	7,663	5,474	7,085	2,585
Charge-offs		0	0	0	0
Recoveries		0	0	0	0
Provision (release)		136	507	714	1,911
Ending balance		7,799	5,981	7,799	5,981
Allowance for loan losses		7,799	5,981	7,799	5,981
Commercial construction \| Commercial Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,485			0	1,485
Allowance for loan losses
Business banking \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10,983	15,228	16,699	16,189	10,983
Charge-offs		(303)	(369)	(900)	(1,922)
Recoveries		609	286	1,294	1,678
Provision (release)		(316)	(354)	(1,225)	(637)
Ending balance		15,218	16,262	15,218	16,262
Allowance for loan losses		15,218	16,262	15,218	16,262
Business banking \| Commercial Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,160			(140)	6,160
Allowance for loan losses
Residential real estate \| Residential Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,556	27,012	21,663	28,129	6,556
Charge-offs		0	0	0	0
Recoveries		30	56	63	80
Provision (release)		(687)	1,288	(988)	2,882
Ending balance		26,355	23,007	26,355	23,007
Allowance for loan losses		26,355	23,007	26,355	23,007
Residential real estate \| Residential Real Estate \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	13,489			(849)	13,489
Allowance for loan losses
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,722	6,044	5,662	6,454	3,722
Charge-offs		0	0	(7)	0
Recoveries		39	6	40	16
Provision (release)		(601)	174	(804)	247
Ending balance		5,482	5,842	5,482	5,842
Allowance for loan losses		5,482	5,842	5,482	5,842
Consumer home equity \| Consumer Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,857			(201)	1,857
Allowance for loan losses
Other Consumer \| Consumer Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,308	2,949	2,626	2,765	3,308
Charge-offs		(731)	(603)	(1,883)	(1,754)
Recoveries		108	158	335	533
Provision (release)		825	446	1,934	1,081
Ending balance		3,151	2,627	3,151	2,627
Allowance for loan losses		$ 3,151	2,627	3,151	2,627
Other Consumer \| Consumer Portfolio Segment \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	(541)			$ 0	(541)
Allowance for loan losses
Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	242				242
Charge-offs					0
Recoveries					0
Provision (release)					0
Ending balance			0		0
Allowance for loan losses			$ 0		0
Other \| Cumulative effect accounting adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ (242)				$ (242)
Allowance for loan losses

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses - Summary of Internal Risk-rating Categories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	$ 1,321,045		$ 1,321,045		$ 3,481,250
2022	3,168,009		3,168,009		2,447,552
2021	2,297,685		2,297,685		1,630,538
2020	1,487,420		1,487,420		1,094,274
2019	975,924		975,924		779,687
Prior	2,959,855		2,959,855		2,496,108
Revolving Loans	1,671,645		1,671,645		1,614,995
Revolving Loans Converted to Term Loans	18,385		18,385		18,124
Total	13,899,968		13,899,968		13,562,528
Current period gross charge-offs
Total	1,045	$ 983	2,801	$ 3,689
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	429,563		429,563		780,736
2022	519,855		519,855		490,827
2021	394,074		394,074		425,901
2020	365,394		365,394		204,752
2019	160,891		160,891		103,461
Prior	659,476		659,476		647,702
Revolving Loans	539,086		539,086		478,083
Revolving Loans Converted to Term Loans	4,011		4,011		1,066
Total	3,072,350		3,072,350		3,132,528
Current period gross charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			11
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Total	11	11	11	13
Commercial and industrial \| Pass \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	421,454		421,454		778,144
2022	489,139		489,139		479,317
2021	377,921		377,921		415,990
2020	351,075		351,075		199,865
2019	160,669		160,669		100,716
Prior	656,163		656,163		639,825
Revolving Loans	497,576		497,576		473,148
Revolving Loans Converted to Term Loans	3,555		3,555		50
Total	2,957,552		2,957,552		3,087,055
Commercial and industrial \| Special Mention \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	8,109		8,109		2,298
2022	30,704		30,704		1,307
2021	14,345		14,345		7,267
2020	13,897		13,897		4,841
2019	186		186		147
Prior	633		633		0
Revolving Loans	18,711		18,711		1,196
Revolving Loans Converted to Term Loans	456		456		670
Total	87,041		87,041		17,726
Commercial and industrial \| Substandard \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		294
2022	12		12		4,954
2021	1,808		1,808		2,644
2020	422		422		46
2019	36		36		2,598
Prior	2,672		2,672		7,854
Revolving Loans	22,799		22,799		485
Revolving Loans Converted to Term Loans	0		0		346
Total	27,749		27,749		19,221
Commercial and industrial \| Doubtful \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		5,249
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	8		8		23
Revolving Loans	0		0		3,254
Revolving Loans Converted to Term Loans	0		0		0
Total	8		8		8,526
Commercial and industrial \| Loss \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	372,774		372,774		1,510,675
2022	1,467,477		1,467,477		825,620
2021	873,581		873,581		589,959
2020	580,368		580,368		605,840
2019	577,648		577,648		501,194
Prior	1,451,637		1,451,637		1,053,298
Revolving Loans	67,157		67,157		60,590
Revolving Loans Converted to Term Loans	2,585		2,585		4,187
Total	5,393,227		5,393,227		5,151,363
Current period gross charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Total	0	0	0	0
Commercial real estate \| Pass \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	372,774		372,774		1,510,675
2022	1,467,477		1,467,477		825,620
2021	858,225		858,225		586,567
2020	575,634		575,634		581,840
2019	524,549		524,549		461,296
Prior	1,342,646		1,342,646		1,006,160
Revolving Loans	59,152		59,152		52,590
Revolving Loans Converted to Term Loans	2,585		2,585		4,187
Total	5,203,042		5,203,042		5,028,935
Commercial real estate \| Special Mention \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		771
2020	744		744		4,204
2019	2,395		2,395		15,366
Prior	28,343		28,343		12,255
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	31,482		31,482		32,596
Commercial real estate \| Substandard \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	15,356		15,356		2,621
2020	3,990		3,990		19,796
2019	50,704		50,704		24,532
Prior	54,851		54,851		34,883
Revolving Loans	8,005		8,005		8,000
Revolving Loans Converted to Term Loans	0		0		0
Total	132,906		132,906		89,832
Commercial real estate \| Doubtful \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	25,797		25,797		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	25,797		25,797		0
Commercial real estate \| Loss \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Commercial construction \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	105,025		105,025		91,397
2022	140,590		140,590		178,648
2021	124,288		124,288		31,317
2020	7		7		20,767
2019	0		0		0
Prior	0		0		0
Revolving Loans	10,727		10,727		12,130
Revolving Loans Converted to Term Loans	0		0		0
Total	380,637		380,637		334,259
Current period gross charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Total	0	0	0	0
Commercial construction \| Pass \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	99,843		99,843		91,397
2022	140,590		140,590		178,648
2021	124,288		124,288		28,956
2020	0		0		20,767
2019	0		0		0
Prior	0		0		0
Revolving Loans	10,727		10,727		12,130
Revolving Loans Converted to Term Loans	0		0		0
Total	375,448		375,448		331,898
Commercial construction \| Special Mention \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	5,182		5,182		0
2022	0		0		0
2021	0		0		2,361
2020	7		7		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	5,189		5,189		2,361
Commercial construction \| Substandard \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Commercial construction \| Doubtful \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Commercial construction \| Loss \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Business banking \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	109,351		109,351		178,806
2022	165,680		165,680		206,703
2021	192,765		192,765		176,147
2020	158,293		158,293		135,731
2019	123,411		123,411		63,762
Prior	264,664		264,664		248,643
Revolving Loans	73,608		73,608		80,455
Revolving Loans Converted to Term Loans	4,044		4,044		4,991
Total	1,091,816		1,091,816		1,095,238
Current period gross charge-offs
2023			0
2022			111
2021			62
2020			56
2019			102
Prior			250
Revolving Loans			23
Revolving Loans Converted to Term Loans			296
Total	303	369	900	1,922
Business banking \| Pass \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	107,950		107,950		178,806
2022	164,497		164,497		202,230
2021	187,765		187,765		170,088
2020	152,567		152,567		128,282
2019	117,485		117,485		59,452
Prior	252,479		252,479		233,484
Revolving Loans	71,942		71,942		78,080
Revolving Loans Converted to Term Loans	3,433		3,433		4,770
Total	1,058,118		1,058,118		1,055,192
Business banking \| Special Mention \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	572		572		991
2021	1,446		1,446		4,635
2020	3,579		3,579		4,605
2019	3,778		3,778		3,740
Prior	8,233		8,233		7,584
Revolving Loans	1,019		1,019		145
Revolving Loans Converted to Term Loans	27		27		0
Total	18,654		18,654		21,700
Business banking \| Substandard \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	1,401		1,401		0
2022	611		611		3,482
2021	3,554		3,554		1,424
2020	2,127		2,127		2,663
2019	1,069		1,069		570
Prior	3,452		3,452		7,505
Revolving Loans	647		647		2,230
Revolving Loans Converted to Term Loans	584		584		221
Total	13,445		13,445		18,095
Business banking \| Doubtful \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	20		20		181
2019	1,079		1,079		0
Prior	500		500		70
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	1,599		1,599		251
Business banking \| Loss \| Commercial Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Residential real estate \| Residential Real Estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	204,250		204,250		766,094
2022	747,699		747,699		702,429
2021	677,289		677,289		383,651
2020	364,515		364,515		103,747
2019	96,601		96,601		70,668
Prior	478,427		478,427		453,466
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	2,568,781		2,568,781		2,480,055
Current period gross charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			0
Revolving Loans Converted to Term Loans			0
Total	0	0	0	0
Residential real estate \| Residential Real Estate \| Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	203,704		203,704		761,442
2022	742,941		742,941		696,959
2021	672,492		672,492		382,262
2020	362,610		362,610		99,494
2019	95,373		95,373		66,702
Prior	464,070		464,070		434,720
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	2,541,190		2,541,190		2,441,579
Residential real estate \| Residential Real Estate \| 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	441		441		4,652
2022	4,032		4,032		5,470
2021	4,343		4,343		1,245
2020	905		905		2,762
2019	940		940		2,951
Prior	8,855		8,855		11,646
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	19,516		19,516		28,726
Residential real estate \| Residential Real Estate \| Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Residential real estate \| Residential Real Estate \| Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	105		105		0
2022	726		726		0
2021	454		454		144
2020	1,000		1,000		1,491
2019	288		288		1,015
Prior	5,502		5,502		7,100
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	8,075		8,075		9,750
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	27,721		27,721		97,954
2022	87,217		87,217		10,774
2021	9,557		9,557		5,840
2020	5,189		5,189		5,076
2019	4,356		4,356		21,438
Prior	87,374		87,374		76,174
Revolving Loans	968,009		968,009		966,188
Revolving Loans Converted to Term Loans	7,584		7,584		7,863
Total	1,197,007		1,197,007		1,191,307
Current period gross charge-offs
2023			0
2022			0
2021			0
2020			0
2019			0
Prior			0
Revolving Loans			7
Revolving Loans Converted to Term Loans			0
Total	0	0	7	0
Consumer home equity \| Consumer Portfolio Segment \| Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	27,721		27,721		97,395
2022	86,954		86,954		10,774
2021	9,557		9,557		5,840
2020	5,189		5,189		5,015
2019	4,356		4,356		21,092
Prior	84,939		84,939		73,927
Revolving Loans	954,862		954,862		953,829
Revolving Loans Converted to Term Loans	7,028		7,028		7,320
Total	1,180,606		1,180,606		1,175,192
Consumer home equity \| Consumer Portfolio Segment \| 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		559
2022	196		196		0
2021	0		0		0
2020	0		0		0
2019	0		0		72
Prior	647		647		944
Revolving Loans	7,675		7,675		7,239
Revolving Loans Converted to Term Loans	377		377		247
Total	8,895		8,895		9,061
Consumer home equity \| Consumer Portfolio Segment \| Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Consumer home equity \| Consumer Portfolio Segment \| Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	67		67		0
2021	0		0		0
2020	0		0		61
2019	0		0		274
Prior	1,788		1,788		1,303
Revolving Loans	5,472		5,472		5,120
Revolving Loans Converted to Term Loans	179		179		296
Total	7,506		7,506		7,054
Other Consumer \| Consumer Portfolio Segment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	72,361		72,361		55,588
2022	39,491		39,491		32,551
2021	26,131		26,131		17,723
2020	13,654		13,654		18,361
2019	13,017		13,017		19,164
Prior	18,277		18,277		16,825
Revolving Loans	13,058		13,058		17,549
Revolving Loans Converted to Term Loans	161		161		17
Total	196,150		196,150		177,778
Current period gross charge-offs
2023			746
2022			307
2021			296
2020			90
2019			84
Prior			200
Revolving Loans			160
Revolving Loans Converted to Term Loans			0
Total	731	$ 603	1,883	$ 1,754
Other Consumer \| Consumer Portfolio Segment \| Current and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	72,222		72,222		55,414
2022	39,286		39,286		32,390
2021	26,060		26,060		17,641
2020	13,635		13,635		18,298
2019	12,949		12,949		18,832
Prior	18,047		18,047		16,603
Revolving Loans	13,030		13,030		17,476
Revolving Loans Converted to Term Loans	112		112		0
Total	195,341		195,341		176,654
Other Consumer \| Consumer Portfolio Segment \| 30-89 days past due and accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	126		126		143
2022	143		143		68
2021	61		61		43
2020	19		19		61
2019	68		68		240
Prior	183		183		178
Revolving Loans	28		28		58
Revolving Loans Converted to Term Loans	0		0		7
Total	628		628		798
Other Consumer \| Consumer Portfolio Segment \| Loans 90 days or more past due and still accruing
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	0		0		0
2022	0		0		0
2021	0		0		0
2020	0		0		0
2019	0		0		0
Prior	0		0		0
Revolving Loans	0		0		0
Revolving Loans Converted to Term Loans	0		0		0
Total	0		0		0
Other Consumer \| Consumer Portfolio Segment \| Non-accrual
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023	13		13		31
2022	62		62		93
2021	10		10		39
2020	0		0		2
2019	0		0		92
Prior	47		47		44
Revolving Loans	0		0		15
Revolving Loans Converted to Term Loans	49		49		10
Total	$ 181		$ 181		$ 326

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses - Summary of Shows the Age Analysis of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Total	$ 13,899,968	$ 13,562,528
Total Past Due
Financing Receivable, Past Due [Line Items]
Total	53,003	67,967
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	30,256	42,715
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total	7,511	6,360
90 or More Days Past Due
Financing Receivable, Past Due [Line Items]
Total	15,236	18,892
Current
Financing Receivable, Past Due [Line Items]
Total	13,846,965	13,494,561
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	3,072,350	3,132,528
Commercial and industrial \| Total Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,495	3,759
Commercial and industrial \| 30-59 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,030	1,300
Commercial and industrial \| 60-89 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	385
Commercial and industrial \| 90 or More Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	465	2,074
Commercial and industrial \| Current \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	3,070,855	3,128,769
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	5,393,227	5,151,363
Commercial real estate \| Total Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial real estate \| 30-59 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial real estate \| 60-89 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial real estate \| 90 or More Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial real estate \| Current \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	5,393,227	5,151,363
Commercial construction \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	380,637	334,259
Commercial construction \| Total Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial construction \| 30-59 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial construction \| 60-89 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial construction \| 90 or More Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	0	0
Commercial construction \| Current \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	380,637	334,259
Business banking \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,091,816	1,095,238
Business banking \| Total Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	7,921	11,004
Business banking \| 30-59 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	4,536	6,642
Business banking \| 60-89 Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,846	845
Business banking \| 90 or More Days Past Due \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,539	3,517
Business banking \| Current \| Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,083,895	1,084,234
Residential real estate \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	2,568,781	2,480,055
Residential real estate \| Total Past Due \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	26,455	36,185
Residential real estate \| 30-59 Days Past Due \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	17,988	25,877
Residential real estate \| 60-89 Days Past Due \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	2,846	3,852
Residential real estate \| 90 or More Days Past Due \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	5,621	6,456
Residential real estate \| Current \| Residential Real Estate
Financing Receivable, Past Due [Line Items]
Total	2,542,326	2,443,870
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,197,007	1,191,307
Consumer home equity \| Total Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	16,323	15,895
Consumer home equity \| 30-59 Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	6,232	8,262
Consumer home equity \| 60-89 Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	2,661	1,108
Consumer home equity \| 90 or More Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	7,430	6,525
Consumer home equity \| Current \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	1,180,684	1,175,412
Other Consumer \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	196,150	177,778
Other Consumer \| Total Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	809	1,124
Other Consumer \| 30-59 Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	470	634
Other Consumer \| 60-89 Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	158	170
Other Consumer \| 90 or More Days Past Due \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	181	320
Other Consumer \| Current \| Consumer Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total	$ 195,341	$ 176,654

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses - Schedule of Non-Accrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	$ 46,985	$ 26,244
Non-Accrual Loans Without ACL	480	12,360
Total Nonaccrual Loans	47,465	38,604
Commercial Portfolio Segment \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	4	3,270
Non-Accrual Loans Without ACL	466	10,707
Total Nonaccrual Loans	470	13,977
Commercial Portfolio Segment \| Commercial real estate
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	25,797	0
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	25,797	0
Commercial Portfolio Segment \| Commercial construction
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	0	0
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	0	0
Commercial Portfolio Segment \| Business banking
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	5,422	5,844
Non-Accrual Loans Without ACL	14	1,653
Total Nonaccrual Loans	5,436	7,497
Residential Real Estate \| Residential real estate
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	8,075	9,750
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	8,075	9,750
Consumer Portfolio Segment \| Consumer home equity
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	7,506	7,054
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	7,506	7,054
Consumer Portfolio Segment \| Other Consumer
Financing Receivable, Past Due [Line Items]
Non-Accrual Loans With ACL	181	326
Non-Accrual Loans Without ACL	0	0
Total Nonaccrual Loans	$ 181	$ 326

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses - Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($) payment	Sep. 30, 2023 USD ($) payment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,861	$ 7,006
% of Total Portfolio	0.02%	0.05%
Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 533
30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		133
60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		400
90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		6,473
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 203	$ 1,792
% of Total Portfolio	0%	0.01%
Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,189	$ 3,222
% of Total Portfolio	0.02%	0.02%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 259
% of Total Portfolio	0%	0%
Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 428	$ 693
% of Total Portfolio	0%	0%
Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 41	$ 767
% of Total Portfolio	0%	0.01%
Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 167
% of Total Portfolio	0%	0%
Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 106
% of Total Portfolio	0%	0%
Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 62	$ 1,016
% of Total Portfolio	0.01%	0.09%
Commercial Portfolio Segment \| Business banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 1,017
Other-than-Insignificant Delay in Repayment \| payment	6	2
Term Extension	4 years 9 months 18 days	5 years 1 month 6 days
Commercial Portfolio Segment \| Business banking \| Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 20
Commercial Portfolio Segment \| Business banking \| 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		20
Commercial Portfolio Segment \| Business banking \| 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Commercial Portfolio Segment \| Business banking \| 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Commercial Portfolio Segment \| Business banking \| Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 997
Commercial Portfolio Segment \| Business banking \| Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	12.70%	9.80%
Commercial Portfolio Segment \| Business banking \| Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8.50%	7.40%
Commercial Portfolio Segment \| Business banking \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 46
% of Total Portfolio	0%	0%
Commercial Portfolio Segment \| Business banking \| Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 21	$ 21
% of Total Portfolio	0%	0%
Commercial Portfolio Segment \| Business banking \| Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 259
% of Total Portfolio	0%	0.02%
Commercial Portfolio Segment \| Business banking \| Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 90
% of Total Portfolio	0%	0.01%
Commercial Portfolio Segment \| Business banking \| Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 41	$ 551
% of Total Portfolio	0%	0.05%
Commercial Portfolio Segment \| Business banking \| Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 26
% of Total Portfolio	0%	0%
Commercial Portfolio Segment \| Business banking \| Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 23
% of Total Portfolio	0%	0%
Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,084	$ 3,046
% of Total Portfolio	0.08%	0.12%
Residential Real Estate \| Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 3,046
Other-than-Insignificant Delay in Repayment \| payment	8	8
Term Extension		23 years 8 months 12 days
Residential Real Estate \| Residential real estate \| Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 113
Residential Real Estate \| Residential real estate \| 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		113
Residential Real Estate \| Residential real estate \| 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Residential Real Estate \| Residential real estate \| 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Residential Real Estate \| Residential real estate \| Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,933
Residential Real Estate \| Residential real estate \| Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		5.40%
Residential Real Estate \| Residential real estate \| Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction		3.60%
Residential Real Estate \| Residential real estate \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 305
% of Total Portfolio	0%	0.01%
Residential Real Estate \| Residential real estate \| Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 2,084	$ 2,517
% of Total Portfolio	0.08%	0.10%
Residential Real Estate \| Residential real estate \| Combination - Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 141
% of Total Portfolio	0%	0.01%
Residential Real Estate \| Residential real estate \| Combination - Interest Rate Reduction, Term Extension & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 83
% of Total Portfolio	0%	0%
Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 715	$ 2,944
% of Total Portfolio	0.06%	0.25%
Consumer Portfolio Segment \| Consumer home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,943
Other-than-Insignificant Delay in Repayment \| payment	3	7
Term Extension		17 years 2 months 12 days
Consumer Portfolio Segment \| Consumer home equity \| Total Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 400
Consumer Portfolio Segment \| Consumer home equity \| 30-59 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Consumer Portfolio Segment \| Consumer home equity \| 60-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		400
Consumer Portfolio Segment \| Consumer home equity \| 90 or More Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		0
Consumer Portfolio Segment \| Consumer home equity \| Current
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance		$ 2,543
Consumer Portfolio Segment \| Consumer home equity \| Maximum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	8%	7.40%
Consumer Portfolio Segment \| Consumer home equity \| Minimum
Financing Receivable, Troubled Debt Restructuring [Line Items]
Interest Rate Reduction	4.80%	4.40%
Consumer Portfolio Segment \| Consumer home equity \| Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 203	$ 1,441
% of Total Portfolio	0.02%	0.12%
Consumer Portfolio Segment \| Consumer home equity \| Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 84	$ 684
% of Total Portfolio	0.01%	0.06%
Consumer Portfolio Segment \| Consumer home equity \| Combination - Interest Rate Reduction & Other-than-Insignificant Delay in Repayment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 428	$ 603
% of Total Portfolio	0.04%	0.05%
Consumer Portfolio Segment \| Consumer home equity \| Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Balance	$ 0	$ 216
% of Total Portfolio	0%	0.02%

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses - Summary of TDR Loans on Accrual and Nonaccrual (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023 contract	Sep. 30, 2023 contract	Dec. 31, 2022 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	21	38	257
Balance of Loans			$ 48,185
TDRs on Accrual Status \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			179
Balance of Loans			$ 28,834
TDRs on Non-Accrual Status \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			78
Balance of Loans			$ 19,351
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	3	4	11
Balance of Loans			$ 15,766
Commercial and industrial \| TDRs on Accrual Status \| Commercial Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			2
Balance of Loans			$ 4,449
Commercial and industrial \| TDRs on Non-Accrual Status \| Commercial Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			9
Balance of Loans			$ 11,317
Business banking \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	9	20	33
Balance of Loans			$ 6,225
Business banking \| TDRs on Accrual Status \| Commercial Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			11
Balance of Loans			$ 4,124
Business banking \| TDRs on Non-Accrual Status \| Commercial Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			22
Balance of Loans			$ 2,101
Residential real estate \| Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	5	8	142
Balance of Loans			$ 21,634
Residential real estate \| TDRs on Accrual Status \| Residential Real Estate \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			114
Balance of Loans			$ 17,618
Residential real estate \| TDRs on Non-Accrual Status \| Residential Real Estate \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			28
Balance of Loans			$ 4,016
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans	4	6	70
Balance of Loans			$ 4,549
Consumer home equity \| TDRs on Accrual Status \| Consumer Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			51
Balance of Loans			$ 2,632
Consumer home equity \| TDRs on Non-Accrual Status \| Consumer Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			19
Balance of Loans			$ 1,917
Other Consumer \| Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			1
Balance of Loans			$ 11
Other Consumer \| TDRs on Accrual Status \| Consumer Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			1
Balance of Loans			$ 11
Other Consumer \| TDRs on Non-Accrual Status \| Consumer Portfolio Segment \| Special mention \| Contractual Obligation Modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Loans \| loan			0
Balance of Loans			$ 0

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses - Summary of the Modifications Which Occurred During the Periods and the Change in the Recorded Investment Subsequent to the Modifications Occurring (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) contract	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) contract	Sep. 30, 2022 USD ($)	Dec. 31, 2022 loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	21		38		257
Pre- Modification Outstanding Recorded Investment	$ 5,687		$ 9,636
Post-Modification Modification Outstanding Recorded Investment	$ 5,687	$ 5,687	$ 9,644	$ 9,644
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	3		4		11
Pre- Modification Outstanding Recorded Investment	$ 2,997		$ 5,415
Post-Modification Modification Outstanding Recorded Investment	$ 2,997		$ 5,415
Business banking \| Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	9		20		33
Pre- Modification Outstanding Recorded Investment	$ 284		$ 854
Post-Modification Modification Outstanding Recorded Investment	$ 284		$ 862
Residential real estate \| Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	5		8		142
Pre- Modification Outstanding Recorded Investment	$ 1,170		$ 1,899
Post-Modification Modification Outstanding Recorded Investment	$ 1,170		$ 1,899
Consumer home equity \| Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	4		6		70
Pre- Modification Outstanding Recorded Investment	$ 1,236		$ 1,468
Post-Modification Modification Outstanding Recorded Investment	$ 1,236		$ 1,468

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses - Summary of Post-modification Balance of TDRs listed by Type of Modification (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs	$ 5,687	$ 5,687	$ 9,644	$ 9,644
Extended maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		0		997
Adjusted interest rate and extended maturity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		123		535
Interest only/principal deferred
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		0		130
Covenant modification
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		0		2,418
Principal and interest deferred
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		2,343		2,343
Extended maturity and interest only/principal deferred
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		2,997		2,997
Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Post modification balance of TDRs		$ 224		$ 224

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses - Summary of the Company's Loan participations (Details) - Loan Participations and Assignments - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 1,673,339	$ 1,542,358
Non-performing Loan Rate (%)	0%	0.55%
Gross Charge-offs	$ 0	$ 3
Commercial and industrial \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 1,097,747	$ 1,024,131
Non-performing Loan Rate (%)	0%	0.83%
Gross Charge-offs	$ 0	$ 0
Commercial real estate \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 439,872	$ 422,042
Non-performing Loan Rate (%)	0%	0%
Gross Charge-offs	$ 0	$ 0
Commercial construction \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 135,612	$ 96,134
Non-performing Loan Rate (%)	0%	0%
Gross Charge-offs	$ 0	$ 0
Business banking \| Commercial Portfolio Segment
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	$ 108	$ 51
Non-performing Loan Rate (%)	0%	0%
Gross Charge-offs	$ 0	$ 3

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disclosure of Leases [Line Items]
Payment of lease payments	$ 3.2	$ 3.3	$ 9.7	$ 11.8
Minimum
Disclosure of Leases [Line Items]
Operating lease remaining lease term	1 year		1 year
Maximum
Disclosure of Leases [Line Items]
Operating lease remaining lease term	25 years		25 years

Leases - Summary of Information

Leases - Summary of Information Relating to Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Right-of-use assets	$ 52,727	$ 48,817
Lease liabilities	$ 55,852	$ 52,105

Leases - Summary of Net Lease C

Leases - Summary of Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 2,974	$ 3,182	$ 8,929	$ 9,670
Finance lease cost	87	77	246	231
Variable lease cost	655	577	1,993	1,914
Total lease cost	$ 3,716	$ 3,836	$ 11,168	$ 11,815

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Operating Leases (Details)	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Weighted-average remaining lease term (in years)	8 years 6 months 3 days	7 years 3 months 3 days
Weighted-average discount rate	3.73%	2.62%

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Remainder of 2023	$ 3,167
2024	10,183
2025	7,772
2026	6,682
2027	5,543
Thereafter	33,587
Total minimum lease payments	66,934
Less: amount representing interest	11,082
Present value of future minimum lease payments	$ 55,852	$ 52,105

Goodwill and Other Intangible_2

Goodwill and Other Intangibles - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Balances not subject to amortization
Goodwill	$ 557,635		$ 557,635
Balances subject to amortization
Total goodwill and other intangible assets	566,709		568,009
Core deposit intangible
Balances subject to amortization
Core deposit intangible	$ 9,074		$ 10,374
Remaining useful life of intangible		5 years

Goodwill and Other Intangible_3

Goodwill and Other Intangibles - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023 reporting_unit
Goodwill and Intangible Assets Disclosure [Abstract]
Number of reporting units	2

Earnings (Loss) Per Share ("E_3

Earnings (Loss) Per Share ("EPS") (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income (loss) from continuing operations	$ 63,464	$ 52,808	$ (94,198)	$ 145,593
Net (loss) income from discontinued operations	(4,351)	1,969	7,872	11,872
Net income (loss)	$ 59,113	$ 54,777	$ (86,326)	$ 157,465
Average number of common shares outstanding (in shares)	175,832,085	177,677,074	175,783,313	180,764,479
Less: Average unallocated ESOP shares (in shares)	(13,461,616)	(13,958,112)	(13,584,155)	(14,082,257)
Average number of common shares outstanding used to calculate basic earnings (loss) per common share (in shares)	162,370,469	163,718,962	162,199,158	166,682,222
Common stock equivalents (in shares)	99,418	310,687	61,345	185,421
Average number of common shares outstanding used to calculate diluted earnings (loss) per common share (in shares)	162,469,887	164,029,649	162,260,503	166,867,643
Basic earnings (loss) per common share:
Earnings (loss) per share from continuing operations (in dollars per share)	$ 0.39	$ 0.32	$ (0.58)	$ 0.87
(Loss) earnings per share from discontinued operations (in dollars per share)	(0.03)	0.01	0.05	0.07
Basic earnings (loss) per share (in dollars per share)	0.36	0.33	(0.53)	0.94
Diluted earnings (loss) per common share:
Earnings (loss) per share from continuing operations (in dollars per share)	0.39	0.32	(0.58)	0.87
(Loss) earnings per share from discontinued operations (in dollars per share)	(0.03)	0.01	0.05	0.07
Diluted earnings per share (in dollars per share)	$ 0.36	$ 0.33	$ (0.53)	$ 0.94

Low Income Housing Tax Credit_3

Low Income Housing Tax Credits and Other Tax Credit Investments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Investments In Affordable Housing Projects [Line Items]
Tax credit investment	$ 226,800,000	$ 131,300,000
Renewable Energy Program
Investments In Affordable Housing Projects [Line Items]
Equity investments	2,300,000	2,600,000
Outstanding investment commitments	$ 0	$ 0
Low income housing tax credit and other tax credit investments
Investments In Affordable Housing Projects [Line Items]
Tax credit period of benefits	15 years
Operating loss tax benefits period	15 years

Low Income Housing Tax Credit_4

Low Income Housing Tax Credits and Other Tax Credit Investments - Summary of the Company's Investments in Low Income Housing Projects Accounted for Using the Proportional Amortization Method (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Investments in Affordable Housing Projects [Abstract]
Current recorded investment included in other assets	$ 224,445		$ 224,445		$ 128,765
Commitments to fund qualified affordable housing projects included in recorded investment noted above	159,230		159,230		$ 84,145
Tax credits and benefits recognized	1,602	$ 2,333	8,169	$ 6,988
Amortization expense included in income tax (benefit) expense	$ 745	$ 1,886	$ 6,322	$ 5,616

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended	9 Months Ended
	Sep. 07, 2022	Nov. 12, 2021	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Number of shares authorized to be repurchased (in shares)	8,900,000	9,337,900
Percentage of shares authorized (in percent)	5%	5%
Purchase period	12 months	12 months
Number of shares repurchased (in shares)	$ 200	$ 225
Repurchased common stock (in shares)			1,481,248	0	8,564,338
Average price paid per share (in dollars per share)			$ 19.53		$ 19.92

Shareholders' Equity - Schedule

Shareholders' Equity - Schedule of Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Equity [Abstract]
Dividends Declared per Share (in dollars per share)	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Dividends Declared	$ 16,400	$ 16,400	$ 16,300	$ 16,500	$ 16,700	$ 17,100
Dividends Paid	$ 16,200	$ 16,300	$ 16,200	$ 16,300	$ 16,500	$ 16,900	$ 48,691	$ 49,759

Employee Benefits - Summary of

Employee Benefits - Summary of Components of Net Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of net periodic benefit cost:
Service cost	$ 6,339	$ 8,094	$ 19,016	$ 24,278
Interest cost	4,297	2,429	12,893	7,289
Expected return on plan assets	(7,532)	(9,280)	(22,596)	(27,842)
Prior service credit	(2,970)	(2,971)	(8,910)	(8,911)
Recognized net actuarial loss	2,468	2,799	7,404	8,395
Net periodic benefit cost	2,602	1,071	7,807	3,209
Discontinued Operations, Held-for-Sale \| Insurance Agency Business
Components of net periodic benefit cost:
Service cost	$ 1,500	$ 1,900	$ 4,500	$ 5,800

Employee Benefits - Additional

Employee Benefits - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Discretionary employer contributions to defined benefit plans	$ 0	$ 0	$ 0	$ 7,200,000

Employee Benefits - Asset Held

Employee Benefits - Asset Held in Rabbi Trust by Plan Type (Details) - Primary Beneficiary - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Book Value	$ 74,121	$ 73,430
Mark-to-Market	6,117	2,856
Fair Value	80,238	76,286
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Book Value	11,420	5,575
Fair Value	11,420	5,575
Equities
Defined Benefit Plan Disclosure [Line Items]
Book Value	55,838	60,056
Mark-to-Market	6,822	3,626
Fair Value	62,660	63,682
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Book Value	6,863	7,799
Mark-to-Market	(705)	(770)
Fair Value	$ 6,158	$ 7,029

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended				9 Months Ended		12 Months Ended	13 Months Ended	22 Months Ended
	Nov. 29, 2021	May 31, 2023	Mar. 31, 2023	May 31, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2022	Sep. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reduction of shares available to be issued upon exercise of stock options with each additional restricted stock grant	3
Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grants in period (in shares)					978,364	318,577	978,364
Equity instruments other than options vested in period (in shares)						231,407	0
Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Grants in period (in shares)						47,820	31,559
Equity instruments other than options vested in period (in shares)						28,690	0
Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period					3 years
Grants in period (in shares)					533,676	108,984	533,676
Equity instruments other than options vested in period (in shares)						0	0
Eastern Bankshares, Inc. 2021 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)	26,146,141
Options granted in period (in shares)									0	0
Equity instruments other than options vested in period (in shares)							0
Unrecognized compensation expense related to unvested awards						$ 32.6		$ 34.6	$ 34.6	$ 32.6
Period for recognition for unrecognized compensation expense related to unvested awards						2 years 6 months		3 years 3 months 18 days
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Restricted Stock Units (RSUs)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)	7,470,326
Award vesting period			3 years
Grants in period (in shares)			318,577
Number of shares available for grant (in shares)						4,830,074		5,302,256	5,302,256	4,830,074
Equity instruments other than options vested in period (in shares)						231,407,000,000			0
Shares withheld for tax withholding obligation (in shares)						$ 4.9
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period					3 years
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Restricted Stock Units (RSUs) \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period					5 years
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Share-based Payment Arrangement, Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares authorized (in shares)	18,675,815
Award expiration period	10 years
Number of shares available for grant (in shares)						18,675,815		18,675,815	18,675,815	18,675,815
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Restricted Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period	5 years	1 year		1 year
Grants in period (in shares)		47,820		31,559
Equity instruments other than options vested in period (in shares)						28,690,000,000
Shares withheld for tax withholding obligation (in shares)						$ 0.5
Eastern Bankshares, Inc. 2021 Equity Incentive Plan \| Performance Shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period			3 years
Grants in period (in shares)			108,984
Equity instruments other than options vested in period (in shares)									0	0

Share-Based Compensation - Shar

Share-Based Compensation - Share-based Payment Arrangement, Restricted Stock, Restricted Stock Unit, and Performance Stock Unit, Activity (Details) - $ / shares	1 Months Ended	9 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Restricted Stock
Number of Shares
Non-vested stock at beginning of year (in shares)		525,460	683,056
Granted (in shares)		47,820	31,559
Vested (in shares)		(28,690)	0
Forfeited (in shares)		0	0
Non-vested stock at end of year (in shares)		544,590	714,615
Weighted-Average Grant Price Per Share
Non-vested stock at beginning of year (in dollars per share)		$ 20.08	$ 20.13
Granted (in dollars per share)		11.50	19.17
Vested (in dollars per share)		19.17	0
Forfeited (in dollars per share)		0	0
Non-vested stock at end of year (in dollars per share)		$ 19.37	$ 20.09
Restricted Stock Units (RSUs)
Number of Shares
Non-vested stock at beginning of year (in shares)		972,325	0
Granted (in shares)	978,364	318,577	978,364
Vested (in shares)		(231,407)	0
Forfeited (in shares)		(3,199)	(6,039)
Non-vested stock at end of year (in shares)		1,056,296	972,325
Weighted-Average Grant Price Per Share
Non-vested stock at beginning of year (in dollars per share)		$ 21.08	$ 0
Granted (in dollars per share)		15.63	21.08
Vested (in dollars per share)		21.08	0
Forfeited (in dollars per share)		16.72	21.08
Non-vested stock at end of year (in dollars per share)		$ 19.45	$ 21.08
Share-based payment arrangement, shares withheld for tax withholding obligation (in shares)		74,625
Performance Shares
Number of Shares
Non-vested stock at beginning of year (in shares)		533,676	0
Granted (in shares)	533,676	108,984	533,676
Vested (in shares)		0	0
Forfeited (in shares)		0	0
Non-vested stock at end of year (in shares)		642,660	533,676
Weighted-Average Grant Price Per Share
Non-vested stock at beginning of year (in dollars per share)		$ 21.12	$ 0
Granted (in dollars per share)		10.16	21.12
Vested (in dollars per share)		0	0
Forfeited (in dollars per share)		0	0
Non-vested stock at end of year (in dollars per share)		$ 19.26	$ 21.12

Share-Based Compensation - Sh_2

Share-Based Compensation - Share-based Compensation Expense Under the 2021 Plan and the Related Tax Benefit (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense			$ 11,387	$ 8,092
Eastern Bankshares, Inc. 2021 Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation expense	$ 3,700	$ 3,600	11,400	8,100
Related tax benefit	$ 1,000	$ 1,000	$ 3,200	$ 2,300

Income Taxes - Summary of Compa

Income Taxes - Summary of Company's Tax Provision and Applicable Tax Rates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Combined federal and state income tax (benefit) provision	$ (16,178)	$ 16,650	$ (65,619)	$ 43,681
Effective income tax rate	(34.20%)	24%	41.10%	23.10%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (16,178)		$ 16,650	$ (65,619)	$ 43,681
Deferred tax asset valuation allowance		$ 17,400
Reversed of valuation allowance	$ 14,600
Deferred state income tax benefit		$ 23,700

Commitments and Contingencies_2

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	$ 5,920,300	$ 5,680,438
Standby letters of credit
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	54,532	65,154
Forward commitments to sell loans
Disclosure Of Financial Instruments Indicated [Line Items]
Contractual obligation	$ 8,495	$ 10,008

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Notional Amount		$ 2,400,000	$ 2,400,000
Fair Value		(351)	(2,401)
Interest rate swaps \| Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Notional Amount		$ 2,400,000	$ 2,400,000
Weighted Average Maturity	4 years 6 months 25 days	3 years 9 months 25 days
Current Rate Paid		5.32%	4.07%
Receive Fixed Swap Rate		3.02%	3.02%
Fair Value		$ (351)	$ (2,401)
Accrued interest payable		$ 2,500	$ 1,500

Derivative Financial Instrume_4

Derivative Financial Instruments - Pre-tax Impact of Terminated Cash Flow Hedges on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance	$ 2,526,772	$ 2,718,396	$ 2,471,790	$ 3,406,352
Unrealized gains on terminated hedges arising during the period	0	0	0	0
Reclassification adjustments for amortization of unrealized gains into net income	0	(1,263)	(46)	(9,652)
Ending balance	2,446,553	2,416,163	2,446,553	2,416,163
Accumulated Gain (Loss), Net, Terminated Cash Flow Hedge, Parent
AOCI Attributable to Parent, Before Tax [Roll Forward]
Beginning Balance	0	1,850	46	10,239
Ending balance	$ 0	$ 587	$ 0	$ 587

Derivative Financial Instrume_5

Derivative Financial Instruments - Additional information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge			4 years
Credit exposure to settled variation margin in excess of customer related interest rate swap	$ 100,000		$ 100,000		$ 0
Notional Amount	2,400,000,000		2,400,000,000		2,400,000,000
Derivative, gain (loss) on derivative, net (less than during the three months ended September 30, 2023 and September 30, 2022)	(100,000)	$ (100,000)	(100,000)	$ (200,000)
Derivative asset	26,344,000		26,344,000		23,861,000
Loan Origination Commitments
Derivative [Line Items]
Notional Amount	12,200,000		12,200,000		8,300,000
Derivative asset	100,000		100,000		100,000
Forward Contracts
Derivative [Line Items]
Notional Amount	8,500,000		8,500,000		10,000,000
Non Cleared Derivative Transactions \| Customer Related Interest Rate Swap Derivatives
Derivative [Line Items]
Fair value of interest rate swap liabilities that are net in a net liability position	0		0		0
Cash and Cash Equivalents \| Non Cleared Derivative Transactions \| Customer Related Interest Rate Swap Derivatives
Derivative [Line Items]
Additional collateral posted	1,000,000		1,000,000		1,000,000
Restricted Assets \| Cash and Cash Equivalents \| Cleared Derivative Transaction
Derivative [Line Items]
Additional collateral posted	84,200,000		84,200,000		$ 84,100,000
Interest Income \| Active Cash Flow Hedges
Derivative [Line Items]
Interest rate swap cash flow hedges amount expected to reclassified from other comprehensive income to income statement in the next twelve months	$ 54,100,000		$ 54,100,000

Derivative Financial Instrume_6

Derivative Financial Instruments - Customer-related derivative positions (Details) $ in Thousands	Sep. 30, 2023 USD ($) position	Dec. 31, 2022 USD ($) position
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Total Notional	$ 2,400,000	$ 2,400,000
Interest rate swaps \| Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions \| position	376	382
Total Notional	$ 2,478,858	$ 2,404,003
Risk participation agreements \| Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions \| position	73	63
Total Notional	$ 267,812	$ 241,029
Matched commercial customer book \| Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions \| position	92	32
Total Notional	$ 45,145	$ 7,877
Foreign currency loan \| Not Designated as Hedging Instrument
Disclosure Of Customer Related Derivatives Not Designated As Hedging [Line Items]
Number of Positions \| position	6	5
Total Notional	$ 11,553	$ 13,948

Derivative Financial Instrume_7

Derivative Financial Instruments - Classification on the balance sheet for the periods indicated (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Asset	$ 26,344	$ 23,861
Net Amount	93,585	81,422
Asset Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Assets, at Fair Value	15	16
Derivatives not designated as hedging instruments, Interest rate swaps, Other assets	25,236	23,567
Derivatives not designated as hedging instruments, Other assets	26,329	23,845
Asset Derivatives \| Risk participation agreements
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	47	78
Asset Derivatives \| Foreign currency exchange contracts - matched customer book
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	785	198
Asset Derivatives \| Foreign currency exchange contracts - foreign currency loan
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other assets	261	2
Liability Derivatives
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivative Instruments in Hedges, Liabilities, at Fair Value	367	2,417
Derivative not designated as hedging instruments, Interest rate swaps, Other liabilities	92,409	78,577
Derivatives not designated as hedging instruments, Other liabilities	93,218	79,005
Liability Derivatives \| Risk participation agreements
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	45	130
Liability Derivatives \| Foreign currency exchange contracts - matched customer book
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	763	205
Liability Derivatives \| Foreign currency exchange contracts - foreign currency loan
Disclosure Of Fair Value Of Derivative Instruments And Their Balance Sheet Classification [Line Items]
Derivatives not designated as hedging instruments, Other liabilities	$ 1	$ 93

Derivative Financial Instrume_8

Derivative Financial Instruments - Company's derivative financial instruments included in OCI as follows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Loss in OCI on derivatives	$ (29,022)	$ (72,667)	$ (66,168)	$ (71,182)
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Gain (loss) recognized in other income for foreign currency exchange contracts:	1,447	936	1,204	4,954
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
(Loss) gain reclassified from OCI into interest income (effective portion)	(13,723)	3,755	(34,557)	12,797
Interest Income \| Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Interest Income \| Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Customer-related positions:	910	1,035	770	4,760
Interest Income \| Risk participation agreements
Derivative Instruments, Gain (Loss) [Line Items]
Customer-related positions:	25	38	54	186
Other Income
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in income on derivatives (ineffective portion and amount excluded from effectiveness test)	0	0	0	0
Other Income \| Foreign currency exchange contracts - matched customer book
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other income for foreign currency exchange contracts:	9	(1)	29	(1)
Other Income \| Foreign currency exchange contracts - foreign currency loan
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in other income for foreign currency exchange contracts:	$ 503	$ (136)	$ 351	$ 9

Balance Sheet Offsetting - Disc

Balance Sheet Offsetting - Disclosure Detail Of Balance Sheet Offsetting Of Financial Assets And Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative Liabilities
Net Amount	$ 93,585	$ 81,422
Customer-related positions
Derivative Assets
Gross Amounts Recognized	26,344	23,861
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	26,344	23,861
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	321	381
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	(16,900)	(14,430)
Net Amount	9,123	9,050
Derivative Liabilities
Gross Amounts Recognized	93,585	81,422
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	93,585	81,422
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	321	381
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	367	2,417
Net Amount	92,897	78,624
Interest rate swaps
Derivative Assets
Gross Amounts Recognized	15	16
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	15	16
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	15	16
Derivative Liabilities
Gross Amounts Recognized	367	2,417
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	367	2,417
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	367	2,417
Net Amount	0	0
Interest rate swaps \| Customer-related positions
Derivative Assets
Gross Amounts Recognized	25,236	23,567
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	25,236	23,567
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	321	381
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	(16,900)	(14,430)
Net Amount	8,015	8,756
Derivative Liabilities
Gross Amounts Recognized	92,409	78,577
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	92,409	78,577
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	321	381
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	92,088	78,196
Risk participation agreements \| Customer-related positions
Derivative Assets
Gross Amounts Recognized	47	78
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	47	78
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	47	78
Derivative Liabilities
Gross Amounts Recognized	45	130
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	45	130
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	45	130
Foreign currency exchange contracts - matched customer book \| Customer-related positions
Derivative Assets
Gross Amounts Recognized	785	198
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	785	198
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	785	198
Derivative Liabilities
Gross Amounts Recognized	763	205
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	763	205
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	763	205
Foreign currency exchange contracts - foreign currency loan \| Customer-related positions
Derivative Assets
Gross Amounts Recognized	261	2
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	261	2
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	261	2
Derivative Liabilities
Gross Amounts Recognized	1	93
Gross Amounts Offset in the Consolidated Balance Sheet	0	0
Net Amounts Presented in the Consolidated Balance Sheet	1	93
Gross Amounts Not Offset in the Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Consolidated Balance Sheet, Collateral Pledged (Received)	0	0
Net Amount	$ 1	$ 93

Fair Value of Assets and Liab_3

Fair Value of Assets and Liabilities - Additional information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in mutual funds	$ 44.2	$ 38.9
Reported Value Measurement \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instruments original maturity	90 days

Fair Value of Assets and Liab_4

Fair Value of Assets and Liabilities - Summary Of The Balances Of Assets And Liabilities Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Securities available for sale	$ 4,261,518	$ 6,690,778
Government-sponsored residential mortgage-backed securities
Assets
Securities available for sale	2,700,630	4,111,908
Government-sponsored commercial mortgage-backed securities
Assets
Securities available for sale	1,089,120	1,348,954
U.S. Agency bonds
Assets
Securities available for sale	207,965	952,482
U.S. Treasury securities
Assets
Securities available for sale	93,219	93,057
Other debt securities
Assets
Securities available for sale		1,285
Fair Value, Recurring
Assets
Rabbi trust investments	80,238	76,286
Loans held for sale	23,892	4,543
Risk participation agreements	47	78
Matched customer book	785	198
Foreign currency loan	261	2
Mortgage derivatives	68	62
Total	4,392,060	6,795,530
Liabilities
Risk participation agreements	45	130
Matched customer book	763	205
Foreign currency loan	1	93
Mortgage derivatives	118	58
Total	93,703	81,480
Fair Value, Recurring \| Designated as Hedging Instrument
Assets
Interest rate swap contracts	15	16
Liabilities
Interest rate swap contracts	367	2,417
Fair Value, Recurring \| Not Designated as Hedging Instrument
Assets
Interest rate swap contracts	25,236	23,567
Liabilities
Interest rate swap contracts	92,409	78,577
Fair Value, Recurring \| Government-sponsored residential mortgage-backed securities
Assets
Securities available for sale	2,700,630	4,111,908
Fair Value, Recurring \| Government-sponsored commercial mortgage-backed securities
Assets
Securities available for sale	1,089,120	1,348,954
Fair Value, Recurring \| U.S. Agency bonds
Assets
Securities available for sale	207,965	952,482
Fair Value, Recurring \| U.S. Treasury securities
Assets
Securities available for sale	93,219	93,057
Fair Value, Recurring \| State and municipal bonds and obligations
Assets
Securities available for sale	170,584	183,092
Fair Value, Recurring \| Other debt securities
Assets
Securities available for sale		1,285
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Rabbi trust investments	74,080	69,257
Loans held for sale	0	0
Risk participation agreements	0	0
Matched customer book	0	0
Foreign currency loan	0	0
Mortgage derivatives	0	0
Total	167,299	162,314
Liabilities
Risk participation agreements	0	0
Matched customer book	0	0
Foreign currency loan	0	0
Mortgage derivatives	0	0
Total	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Designated as Hedging Instrument
Assets
Interest rate swap contracts	0	0
Liabilities
Interest rate swap contracts	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Not Designated as Hedging Instrument
Assets
Interest rate swap contracts	0	0
Liabilities
Interest rate swap contracts	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government-sponsored residential mortgage-backed securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government-sponsored commercial mortgage-backed securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Agency bonds
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasury securities
Assets
Securities available for sale	93,219	93,057
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| State and municipal bonds and obligations
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other debt securities
Assets
Securities available for sale		0
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2)
Assets
Rabbi trust investments	6,158	7,029
Loans held for sale	23,892	4,543
Risk participation agreements	47	78
Matched customer book	785	198
Foreign currency loan	261	2
Mortgage derivatives	68	62
Total	4,224,761	6,633,216
Liabilities
Risk participation agreements	45	130
Matched customer book	763	205
Foreign currency loan	1	93
Mortgage derivatives	118	58
Total	93,703	81,480
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Designated as Hedging Instrument
Assets
Interest rate swap contracts	15	16
Liabilities
Interest rate swap contracts	367	2,417
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Not Designated as Hedging Instrument
Assets
Interest rate swap contracts	25,236	23,567
Liabilities
Interest rate swap contracts	92,409	78,577
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Government-sponsored residential mortgage-backed securities
Assets
Securities available for sale	2,700,630	4,111,908
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Government-sponsored commercial mortgage-backed securities
Assets
Securities available for sale	1,089,120	1,348,954
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Agency bonds
Assets
Securities available for sale	207,965	952,482
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Treasury securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| State and municipal bonds and obligations
Assets
Securities available for sale	170,584	183,092
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Other debt securities
Assets
Securities available for sale		1,285
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3)
Assets
Rabbi trust investments	0	0
Loans held for sale	0	0
Risk participation agreements	0	0
Matched customer book	0	0
Foreign currency loan	0	0
Mortgage derivatives	0	0
Total	0	0
Liabilities
Risk participation agreements	0	0
Matched customer book	0	0
Foreign currency loan	0	0
Mortgage derivatives	0	0
Total	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Designated as Hedging Instrument
Assets
Interest rate swap contracts	0	0
Liabilities
Interest rate swap contracts	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Not Designated as Hedging Instrument
Assets
Interest rate swap contracts	0	0
Liabilities
Interest rate swap contracts	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Government-sponsored residential mortgage-backed securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Government-sponsored commercial mortgage-backed securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Agency bonds
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Treasury securities
Assets
Securities available for sale	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| State and municipal bonds and obligations
Assets
Securities available for sale	$ 0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Other debt securities
Assets
Securities available for sale		$ 0

Fair Value of Assets and Liab_5

Fair Value of Assets and Liabilities - Summary Of The Fair Value Of Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis (Details) - Fair Value, Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Individually assessed collateral-dependent loans whose fair value is based upon appraisals	$ 18,105	$ 16,432
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Individually assessed collateral-dependent loans whose fair value is based upon appraisals	0	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Individually assessed collateral-dependent loans whose fair value is based upon appraisals	0	0
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Individually assessed collateral-dependent loans whose fair value is based upon appraisals	$ 18,105	$ 16,432

Fair Value of Assets and Liab_6

Fair Value of Assets and Liabilities - Schedule of Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	$ 455,900	$ 476,647
FHLB stock	37,125	41,363
Bank-owned life insurance	163,700	160,790
Deposits	17,424,169	18,974,359
FHLB advances	17,189	12,787
Escrow deposits of borrowers	24,947	22,314
Interest rate swap collateral funds	16,900	14,430
Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	260,271	276,493
Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	195,629	200,154
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans, net of allowance for loan losses	0	0
FHLB stock	0	0
Bank-owned life insurance	0	0
Deposits	0	0
FHLB advances	0	0
Escrow deposits of borrowers	0	0
Interest rate swap collateral funds	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	0	0
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans, net of allowance for loan losses	0	0
FHLB stock	37,125	41,363
Bank-owned life insurance	163,700	160,790
Deposits	17,412,731	18,960,407
FHLB advances	670,747	702,954
Escrow deposits of borrowers	24,947	22,314
Interest rate swap collateral funds	16,900	14,430
Significant Other Observable Inputs (Level 2) \| Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	219,548	246,343
Significant Other Observable Inputs (Level 2) \| Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	168,106	176,883
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans, net of allowance for loan losses	13,099,665	13,149,096
FHLB stock	0	0
Bank-owned life insurance	0	0
Deposits	0	0
FHLB advances	0	0
Escrow deposits of borrowers	0	0
Interest rate swap collateral funds	0	0
Significant Unobservable Inputs (Level 3) \| Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	0	0
Significant Unobservable Inputs (Level 3) \| Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	0	0
Carrying Value
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans, net of allowance for loan losses	13,744,822	13,420,317
FHLB stock	37,125	41,363
Bank-owned life insurance	163,700	160,790
Deposits	17,424,169	18,974,359
FHLB advances	673,525	704,084
Escrow deposits of borrowers	24,947	22,314
Interest rate swap collateral funds	16,900	14,430
Carrying Value \| Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	260,271	276,493
Carrying Value \| Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	195,629	200,154
Estimate of Fair Value Measurement
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Loans, net of allowance for loan losses	13,099,665	13,149,096
FHLB stock	37,125	41,363
Bank-owned life insurance	163,700	160,790
Deposits	17,412,731	18,960,407
FHLB advances	670,747	702,954
Escrow deposits of borrowers	24,947	22,314
Interest rate swap collateral funds	16,900	14,430
Estimate of Fair Value Measurement \| Government-sponsored residential mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	219,548	246,343
Estimate of Fair Value Measurement \| Government-sponsored commercial mortgage-backed securities
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Held to maturity securities:	$ 168,106	$ 176,883

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Total noninterest income in-scope of ASC 606	$ 19,574	$ 18,517	$ 57,047	$ 59,009
Total noninterest (loss) income out-of-scope of ASC 606	(417)	1,007	(321,539)	(4,684)
Total noninterest income (loss)	19,157	19,524	(264,492)	54,325
Service charges on deposit accounts
Revenue from External Customer [Line Items]
Total noninterest income in-scope of ASC 606	7,403	6,708	21,117	23,558
Trust and investment advisory fees
Revenue from External Customer [Line Items]
Total noninterest income in-scope of ASC 606	6,235	5,832	18,136	17,967
Debit card processing fees
Revenue from External Customer [Line Items]
Total noninterest income in-scope of ASC 606	3,388	3,249	10,071	9,417
Other noninterest income
Revenue from External Customer [Line Items]
Total noninterest income in-scope of ASC 606	$ 2,548	$ 2,728	$ 7,723	$ 8,067

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Cash Management Fees
Disaggregation of Revenue [Line Items]
Fess earned but not yet received	$ 1.7	$ 2.1
Debit Card
Disaggregation of Revenue [Line Items]
Fess earned but not yet received	$ 0.3	$ 0.3

Other Comprehensive Income - Co

Other Comprehensive Income - Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2023
Pre Tax Amount
Total other comprehensive (loss) income	$ (173,551)	$ (414,158)	$ 105,794	$ (1,193,208)
Tax Benefit (Expense)
Total other comprehensive (loss) income	44,951	96,503	(12,184)	271,086
After Tax Amount
Before reclassifications			(188,628)	(914,312)
Less: reclassification adjustments			(282,238)	7,810
Total other comprehensive (loss) income	(128,600)	(317,655)	93,610	(922,122)
Accretion of gains from terminated cash flow hedges (less than)			(46)	(9,653)
Total realized gain, net of tax	41,200		41,200		$ 41,200
Balance of gain after amortization, net of tax		400		400
Unrealized Gains and (Losses) on Cash Flow Hedges
After Tax Amount
Accretion of gains from terminated cash flow hedges (less than)			100
Unrealized losses on securities available for sale:
Pre Tax Amount
Before reclassifications	(157,750)	(337,762)	(194,259)	(1,111,187)
Less: reclassification adjustments	0	(198)	(333,170)	(2,474)
Total other comprehensive (loss) income	(157,750)	(337,564)	138,911	(1,108,713)
Tax Benefit (Expense)
Before reclassifications	40,490	76,107	52,004	249,158
Less: reclassification adjustments	0	12	74,630	714
Total other comprehensive (loss) income	40,490	76,095	(22,626)	248,444
After Tax Amount
Before reclassifications	(117,260)	(261,655)	(142,255)	(862,029)
Less: reclassification adjustments	0	(186)	(258,540)	(1,760)
Total other comprehensive (loss) income	(117,260)	(261,469)	116,285	(860,269)
Unrealized losses on cash flow hedges:
Pre Tax Amount
Before reclassifications	(29,022)	(72,667)	(66,168)	(71,182)
Less: reclassification adjustments	(13,723)	3,755	(34,557)	12,797
Total other comprehensive (loss) income	(15,299)	(76,422)	(31,611)	(83,979)
Tax Benefit (Expense)
Before reclassifications	8,193	19,304	19,795	18,899
Less: reclassification adjustments	3,874	(1,056)	9,757	(3,598)
Total other comprehensive (loss) income	4,319	20,360	10,038	22,497
After Tax Amount
Before reclassifications	(20,829)	(53,363)	(46,373)	(52,283)
Less: reclassification adjustments	(9,849)	2,699	(24,800)	9,199
Total other comprehensive (loss) income	(10,980)	(56,062)	(21,573)	(61,482)
Defined benefit pension plans:
Pre Tax Amount
Total other comprehensive (loss) income	(502)	(172)	(1,506)	(516)
Tax Benefit (Expense)
Total other comprehensive (loss) income	142	48	404	145
After Tax Amount
Before reclassifications			0	0
Less: reclassification adjustments			1,102	371
Total other comprehensive (loss) income	(360)	(124)	(1,102)	(371)
Change in actuarial net loss
Pre Tax Amount
Before reclassifications	0	0	0	0
Tax Benefit (Expense)
Before reclassifications	0	0	0	0
After Tax Amount
Before reclassifications	0	0	0	0
Less: amortization of actuarial net loss
Pre Tax Amount
Less: reclassification adjustments	(2,468)	(2,799)	(7,404)	(8,395)
Tax Benefit (Expense)
Less: reclassification adjustments	697	787	2,091	2,360
After Tax Amount
Less: reclassification adjustments	(1,771)	(2,012)	(5,313)	(6,035)
Less: accretion of prior service credit
Pre Tax Amount
Less: reclassification adjustments	2,970	2,971	8,910	8,911
Tax Benefit (Expense)
Less: reclassification adjustments	(839)	(835)	(2,495)	(2,505)
After Tax Amount
Less: reclassification adjustments	$ 2,131	$ 2,136	$ 6,415	$ 6,406

Other Comprehensive Income - Sc

Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 2,526,772	$ 2,718,396	$ 2,471,790	$ 3,406,352
Other comprehensive loss before reclassifications			(188,628)	(914,312)
Less: Amounts reclassified from accumulated other comprehensive loss			(282,238)	7,810
Net current-period other comprehensive income (loss)			93,610	(922,122)
Ending balance	2,446,553	2,416,163	2,446,553	2,416,163
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(700,982)	(661,163)	(923,192)	(56,696)
Ending balance	(829,582)	(978,818)	(829,582)	(978,818)
Unrealized Gains and (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(880,156)	(58,586)
Other comprehensive loss before reclassifications	(117,260)	(261,655)	(142,255)	(862,029)
Less: Amounts reclassified from accumulated other comprehensive loss	0	(186)	(258,540)	(1,760)
Net current-period other comprehensive income (loss)			116,285	(860,269)
Ending balance	(763,871)	(918,855)	(763,871)	(918,855)
Unrealized Gains and (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			(50,159)	7,361
Other comprehensive loss before reclassifications	(20,829)	(53,363)	(46,373)	(52,283)
Less: Amounts reclassified from accumulated other comprehensive loss	(9,849)	2,699	(24,800)	9,199
Net current-period other comprehensive income (loss)			(21,573)	(61,482)
Ending balance	(71,732)	(54,121)	(71,732)	(54,121)
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance			7,123	(5,471)
Other comprehensive loss before reclassifications			0	0
Less: Amounts reclassified from accumulated other comprehensive loss			1,102	371
Net current-period other comprehensive income (loss)			(1,102)	(371)
Ending balance	$ 6,021	$ (5,842)	$ 6,021	$ (5,842)

Discontinued Operations - Addit

Discontinued Operations - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Oct. 31, 2023	Sep. 19, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment of right-of-use assets		$ 395	$ 604
Discontinued Operations, Held-for-Sale \| Insurance Agency Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross cash consideration					$ 515,000
Total compensation	$ 1,000	1,000
ROU lease asset	1,000	1,000				$ 8,700
Lease liability	3,500	3,500				9,200
Net reduction of the lease ROU assets		6,400
Impairment of right-of-use assets	2,000	2,000
Insurance commission receivable	16,100	16,100				15,100
Discontinued Operations, Held-for-Sale \| Insurance Agency Business \| Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross cash consideration				$ 515,000
Disposal Group, Not Discontinued Operations, Transferrable Upon Sale to Entity \| Insurance Agency Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
ROU lease asset	400	400				1,900
Lease liability	$ 600	$ 600				$ 2,200

Discontinued Operations - Summa

Discontinued Operations - Summary of the Asset and Liabilities of the Discontinued Insurance Agency Business (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Total assets	$ 124,718	$ 128,219
Liabilities
Total liabilities	34,820	34,930
Discontinued Operations, Held-for-Sale \| Insurance Agency Business
Assets
Premises and equipment	50	163
Goodwill and intangibles, net	91,115	93,117
Deferred income taxes, net	(187)	(315)
Prepaid expenses	476	532
Other assets	33,264	34,722
Total assets	124,718	128,219
Liabilities
Other liabilities	34,820	34,930
Total liabilities	34,820	34,930
Disposal Group, Not Discontinued Operations, Transferrable Upon Sale to Entity \| Insurance Agency Business
Assets
Cash	77,852	66,507
Premises and equipment	1,776	1,792
Bank-owned life insurance	2,109	2,066
Deferred income taxes, net	3,457	3,662
Other assets	11,187	12,944
Total assets	96,381	86,971
Liabilities
Other liabilities	12,166	14,013
Total liabilities	$ 12,166	$ 14,013

Discontinued Operations - Sum_2

Discontinued Operations - Summary of the Operating Results of the Discontinued Insurance Agency Business (Details) - Insurance Agency Business - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Discontinued Operations, Held-for-Sale
Noninterest income:
Insurance commissions	$ 25,897	$ 23,926	$ 85,177	$ 77,511
Other noninterest income	13	41	51	137
Total noninterest (loss) income	25,910	23,967	85,228	77,648
Noninterest expense:
Salaries and employee benefits	24,655	16,768	57,991	49,057
Office occupancy and equipment	2,755	823	4,279	2,401
Data processing	1,013	1,052	3,216	3,248
Professional services	1,291	549	2,615	738
Marketing expenses	53	101	152	182
Amortization of intangible assets	665	734	2,002	1,868
Other	1,514	1,186	3,976	3,613
Total noninterest expense	31,946	21,213	74,231	61,107
(Loss) income from discontinued operations before income tax expense	(6,036)	2,754	10,997	16,541
Income tax (benefit) expense	(1,685)	785	3,125	4,669
(Loss) income from discontinued operations, net of taxes	(4,351)	1,969	7,872	11,872
Disposal Group, Not Discontinued Operations, Transferrable Upon Sale to Entity
Noninterest income:
(Losses) income from investments held in rabbi trusts	(91)	(266)	489	(1,634)
Other noninterest income	15	14	44	40
Total noninterest (loss) income	(76)	(252)	533	(1,594)
Noninterest expense:
Salaries and employee benefits	(96)	(268)	484	(1,616)
Office occupancy and equipment	102	125	343	375
Other	474	129	1,468	320
Total noninterest expense	480	(14)	2,295	(921)
(Loss) income from discontinued operations before income tax expense	(556)	(238)	(1,762)	(673)
Income tax (benefit) expense	(156)	(67)	(495)	(189)
(Loss) income from discontinued operations, net of taxes	$ (400)	$ (171)	$ (1,267)	$ (484)

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Nov. 03, 2023	Sep. 19, 2023
Subsequent Event [Line Items]
Noninterest expense		$ 101,748	$ 95,765	$ 297,573	$ 276,066
Discontinued Operations, Held-for-Sale \| Insurance Agency Business
Subsequent Event [Line Items]
Gross cash consideration							$ 515,000
Discontinued Operations, Held-for-Sale \| Insurance Agency Business \| Subsequent Event
Subsequent Event [Line Items]
Net cash consideration	$ 498,100
Gross cash consideration	515,000
Working capital adjustment	4,200
Transaction expenses	17,000
Post-retirement liabilities	4,100
Fiduciary cash transferred	7,400
Gain (loss) on disposition of assets	389,300
Noninterest expense	$ 24,200
Discontinued Operations, Held-for-Sale \| Insurance Agency Business \| Subsequent Event \| Minimum
Subsequent Event [Line Items]
Estimated curtailment gain at the time of the amendments to the Plans						$ 13,000
Discontinued Operations, Held-for-Sale \| Insurance Agency Business \| Subsequent Event \| Maximum
Subsequent Event [Line Items]
Estimated curtailment gain at the time of the amendments to the Plans						$ 18,000

Uncategorized Items - ebc-20230

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2016-13 [Member]	[1]

[1] Represents gross transition adjustment amount of $28.0 million, net of taxes of $7.9 million, to reflect the cumulative impact on retained earnings pursuant to the Company’s adoption of Accounting Standards Update 2016-13. Refer to Note 4, “Loans and Allowance for Credit Losses” within the Notes to the Unaudited Consolidated Financial Statements included in Part I, Item 1 in this Quarterly Report on Form 10-Q for additional discussion.