M&T Bank (MTB) 10-Q6 Nov 232023 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2023	Nov. 01, 2023
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Registrant Name	M&T BANK CORPORATION
Entity Central Index Key	0000036270
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		165,960,333
Entity File Number	1-9861
Entity Tax Identification Number	16-0968385
Entity Incorporation, State or Country Code	NY
Entity Address, Address Line One	One M & T Plaza
Entity Address, Postal Zip Code	14203
Entity Address, City or Town	Buffalo
Entity Address, State or Province	NY
City Area Code	716
Local Phone Number	635-4000
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Common Stock [Member]
Document Information [Line Items]
Trading Symbol	MTB
Title of 12(b) Security	Common Stock, $.50 par value
Security Exchange Name	NYSE
Series H Preferred Stock [Member]
Document Information [Line Items]
Trading Symbol	MTBPrH
Title of 12(b) Security	Perpetual Fixed-to-Floating RateNon-Cumulative Preferred Stock, Series H
Security Exchange Name	NYSE

Consolidated Balance Sheet (Una

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 1,768,864	$ 1,517,244
Interest-bearing deposits at banks	30,114,286	24,958,719
Federal funds sold		3,000
Trading account	136,998	117,847
Investment securities
Available for sale (cost: $11,038,966 at September 30, 2023; $11,193,152 at December 31, 2022)	10,592,409	10,748,961
Held to maturity (fair value: $13,764,943 at September 30, 2023; $12,375,420 at December 31, 2022)	15,571,120	13,529,969
Equity and other securities (cost: $1,174,046 at September 30, 2023; $933,766 at December 31, 2022)	1,172,574	931,941
Total investment securities	27,336,103	25,210,871
Loans and leases	133,133,497	132,074,156
Unearned discount	(778,812)	(509,993)
Loans and leases, net of unearned discount	132,354,685	131,564,163
Allowance for credit losses	(2,052,127)	(1,925,331)
Loans and leases, net	130,302,558	129,638,832
Premises and equipment	1,681,051	1,653,628
Goodwill	8,465,089	8,490,089
Core deposit and other intangible assets	162,275	209,374
Accrued interest and other assets	9,157,092	8,930,237
Total assets	209,124,316	200,729,841
Liabilities
Noninterest-bearing deposits	53,786,987	65,501,860
Savings and interest-checking deposits	90,297,219	87,911,463
Time deposits	20,043,601	10,101,545
Total deposits	164,127,807	163,514,868
Short-term borrowings	6,730,663	3,554,951
Accrued interest and other liabilities	4,945,918	4,377,495
Long-term borrowings	7,123,426	3,964,537
Total liabilities	182,927,814	175,411,851
Shareholders' equity
Preferred stock, $1.00 par, 20,000,000 shares authorized; Issued and outstanding: Liquidation preference of $1,000 per share: 350,000 shares at September 30, 2023 and December 31, 2022; Liquidation preference of $10,000 per share: 140,000 shares at September 30, 2023 and December 31, 2022; Liquidation preference of $25 per share: 10,000,000 shares at September 30, 2023 and December 31, 2022	2,010,600	2,010,600
Common stock, $.50 par, 250,000,000 shares authorized, 179,436,779 shares issued at September 30, 2023 and December 31, 2022	89,718	89,718
Common stock issuable, 12,140 shares at September 30, 2023; 14,031 shares at December 31, 2022	979	1,112
Additional paid-in capital	10,012,438	10,002,891
Retained earnings	17,284,350	15,753,978
Accumulated other comprehensive income (loss), net	(941,878)	(790,030)
Treasury stock - common, at cost - 13,478,535 shares at September 30, 2023; 10,165,419 shares at December 31, 2022	(2,259,705)	(1,750,279)
Total shareholders’ equity	26,196,502	25,317,990
Total liabilities and shareholders’ equity	$ 209,124,316	$ 200,729,841

Consolidated Balance Sheet (U_2

Consolidated Balance Sheet (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Investment securities, available for sale, amortized cost	$ 11,038,966	$ 11,193,152
Investment securities, held to maturity, fair value	13,764,943	12,375,420
Equity and other securities, cost	$ 1,174,046	$ 933,766
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	10,000,000	10,000,000
Preferred stock, liquidation preference per share	$ 25	$ 25
Common stock, par value	$ 0.50	$ 0.50
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	179,436,779	179,436,779
Common stock issuable, shares	12,140	14,031
Treasury stock, common shares	13,478,535	10,165,419
Series A Series C Series And E Preferred Stock [Member]
Preferred stock, shares issued	350,000	350,000
Preferred stock, shares outstanding	350,000	350,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Series F And Series G Preferred Stock [Member]
Preferred stock, shares issued	140,000	140,000
Preferred stock, shares outstanding	140,000	140,000
Preferred stock, liquidation preference per share	$ 10,000	$ 10,000

Consolidated Statement of Incom

Consolidated Statement of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Loans and leases, including fees	$ 2,061,570	$ 1,455,612	$ 5,909,035	$ 3,572,954
Investment securities
Fully taxable	199,187	135,766	578,656	294,290
Exempt from federal taxes	16,425	16,555	49,541	34,388
Deposits at banks	362,840	172,956	943,686	272,009
Other	1,377	624	3,091	1,270
Total interest income	2,641,399	1,781,513	7,484,009	4,174,911
Interest expense
Savings and interest-checking deposits	494,219	68,690	1,139,649	103,344
Time deposits	201,541	1,124	441,075	3,748
Short-term borrowings	69,481	2,670	223,253	6,090
Long-term borrowings	100,770	30,338	287,251	67,147
Total interest expense	866,011	102,822	2,091,228	180,329
Net interest income	1,775,388	1,678,691	5,392,781	3,994,582
Provision for credit losses	150,000	115,000	420,000	427,000
Net interest income after provision for credit losses	1,625,388	1,563,691	4,972,781	3,567,582
Other income
Brokerage services income	26,988	21,086	76,155	65,414
Trading account and other non-hedging derivative gains	9,379	5,081	37,808	12,743
Gain (loss) on bank investment securities	(235)	(1,108)	353	(1,913)
Other revenues from operations	142,519	153,189	664,034	436,943
Total other income	559,581	563,079	1,949,885	1,675,066
Other expense
Salaries and employee benefits	726,940	736,354	2,272,547	2,090,075
Equipment and net occupancy	130,842	127,117	386,435	337,584
Outside data processing and software	110,691	95,068	322,909	268,607
FDIC assessments	29,364	28,105	87,054	66,266
Advertising and marketing	22,898	21,398	82,314	58,057
Printing, postage and supplies	13,964	14,768	42,346	40,488
Amortization of core deposit and other intangible assets	14,946	18,384	47,099	38,024
Other costs of operations	227,893	238,059	688,623	743,047
Total other expense	1,277,538	1,279,253	3,929,327	3,642,148
Income before taxes	907,431	847,517	2,993,339	1,600,500
Income taxes	217,490	200,921	734,740	374,208
Net income	689,941	646,596	2,258,599	1,226,292
Net income available to common shareholders
Basic	663,763	620,549	2,179,802	1,152,400
Diluted	$ 663,766	$ 620,554	$ 2,179,812	$ 1,152,406
Net income per common share
Basic	$ 4	$ 3.55	$ 13.09	$ 7.18
Diluted	$ 3.98	$ 3.53	$ 13.05	$ 7.14
Average common shares outstanding
Basic	165,909	174,609	166,488	160,474
Diluted	166,570	175,682	167,093	161,295
Mortgage Banking Revenues [Member]
Other income
Revenue from contract with customer	$ 104,478	$ 83,041	$ 296,575	$ 275,115
Service Charges on Deposit Accounts [Member]
Other income
Revenue from contract with customer	121,360	115,213	353,603	340,890
Trust Income [Member]
Other income
Revenue from contract with customer	$ 155,092	$ 186,577	$ 521,357	$ 545,874

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Partners' Capital [Abstract]
Net Income (Loss)	$ 689,941	$ 646,596	$ 2,258,599	$ 1,226,292
Other comprehensive income (loss), net of tax and reclassification adjustments:
Net unrealized losses on investment securities	(3,108)	(218,852)	(1,778)	(425,770)
Cash flow hedges adjustments	(70,255)	(172,285)	(145,612)	(344,534)
Foreign currency translation adjustments	(2,457)	(5,359)	53	(11,271)
Defined benefit plans liability adjustments	(1,258)	2,993	(4,511)	9,160
Total other comprehensive income (loss)	(77,078)	(393,503)	(151,848)	(772,415)
Total comprehensive income	$ 612,863	$ 253,093	$ 2,106,751	$ 453,877

Consolidated Statement of Cash

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net Income (Loss)	$ 2,258,599	$ 1,226,292
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	420,000	427,000
Depreciation and amortization of premises and equipment	226,786	219,737
Amortization of capitalized servicing rights	93,799	75,165
Amortization of core deposit and other intangible assets	47,099	38,024
Provision for deferred income taxes	(39,922)	(89,413)
Asset write-downs	3,318	7,358
Net gain on sales of assets	(244,413)	(14,583)
Net change in accrued interest receivable, payable	232,610	(58,629)
Net change in other accrued income and expense	207,845	(71,004)
Net change in loans originated for sale	(257,145)	560,861
Net change in trading account and other non-hedging derivative assets and liabilities	156,145	1,299,313
Net cash provided by operating activities	3,104,721	3,620,121
Cash flows from investing activities
Proceeds from sales of investment securities equity and other	809,058	42,999
Proceeds from maturities of investment securities Available for sale	512,669	641,573
Proceeds from maturities of investment securities Held to maturity	923,707	1,053,989
Purchases of investment securities Available for sale	(343,946)	(7,219,785)
Purchases of investment securities Held to maturity	(2,947,627)	(796,312)
Purchases of investment securities equity and other	(1,049,338)	(155,290)
Net increase in loans and leases	(850,349)	(58,942)
Net (increase) decrease in interest-bearing deposits at banks	(5,155,567)	25,674,122
Capital expenditures, net	(168,213)	(126,810)
Net decrease in loan servicing advances	305,622	1,324,912
Acquisition, net of cash consideration, Bank and bank holding company		393,923
Other, net	(592,921)	(516,504)
Net cash provided (used) by investing activities	(8,556,905)	20,257,875
Cash flows from financing activities
Net increase (decrease) in deposits	607,737	(20,663,949)
Net increase (decrease) in short-term borrowings	3,175,712	(24,111)
Proceeds from long-term borrowings	4,032,374	499,250
Payments on long-term borrowings	(780,715)	(907,191)
Purchases of treasury stock	(594,000)	(1,200,000)
Dividends paid — common	(652,338)	(578,968)
Dividends paid — preferred	(83,435)	(80,600)
Other, net	(4,531)	(4,194)
Net cash provided (used) by financing activities	5,700,804	(22,959,763)
Net increase in cash, cash equivalents and restricted cash	248,620	918,233
Cash, cash equivalents and restricted cash at beginning of period	1,520,244	1,337,577
Cash, cash equivalents and restricted cash at end of period	1,768,864	2,255,810
Supplemental disclosure of cash flow information
Interest received during the period	7,428,629	4,145,231
Interest paid during the period	1,779,089	214,552
Income taxes paid during the period	430,802	362,866
Supplemental schedule of noncash investing and financing activities
Real estate acquired in settlement of loans	16,818	21,017
Additions to right-of-use assets under operating leases	$ 88,263	99,705
Acquisition of bank and bank holding company, Common stock issued		8,286,515
Acquisition of bank and bank holding company, Common stock awards converted		104,810
Fair value of Assets acquired (noncash)		63,757,316
Fair value of Liabilities assumed		55,499,314
Fair value of Preferred stock converted		$ 260,600

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders' Equity - USD ($) $ in Thousands		Total	Preferred Stock [Member]	Common Stock [Member]	Common Stock Issuable [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Treasury Stock
Beginning balance at Dec. 31, 2021		$ 17,903,405	$ 1,750,000	$ 79,871	$ 1,212	$ 6,635,000	$ 14,646,448	$ (127,578)	$ (5,081,548)
Total comprehensive income		453,877					1,226,292	(772,415)
Common stock issued		8,286,515		9,824		3,256,821			5,019,870
Common stock awards converted		104,810				104,810
Conversion of Series H preferred stock		260,600	260,600
Preferred stock cash dividends	[1]	(71,647)					(71,647)
Purchases of treasury stock		(1,200,000)							(1,200,000)
Stock-based compensation transactions, net		99,228		23	(114)	(2,236)	(970)		102,525
Common stock cash dividends		(580,295)					(580,295)
Ending balance at Sep. 30, 2022		25,256,493	2,010,600	89,718	1,098	9,994,395	15,219,828	(899,993)	(1,159,153)
Beginning balance at Jun. 30, 2022		25,794,531	2,010,600	89,718	1,090	9,986,881	14,808,637	(506,490)	(595,905)
Total comprehensive income		253,093					646,596	(393,503)
Preferred stock cash dividends	[1]	(24,941)					(24,941)
Purchases of treasury stock		(600,000)							(600,000)
Stock-based compensation transactions, net		43,947			8	7,514	(327)		36,752
Common stock cash dividends		(210,137)					(210,137)
Ending balance at Sep. 30, 2022		25,256,493	2,010,600	89,718	1,098	9,994,395	15,219,828	(899,993)	(1,159,153)
Beginning balance at Dec. 31, 2022		25,317,990	2,010,600	89,718	1,112	10,002,891	15,753,978	(790,030)	(1,750,279)
Total comprehensive income		2,106,751					2,258,599	(151,848)
Preferred stock cash dividends	[1]	(74,822)					(74,822)
Purchases of treasury stock	[2]	(599,940)							(599,940)
Stock-based compensation transactions, net	[2]	98,513			(133)	9,547	(1,415)		90,514
Common stock cash dividends		(651,990)					(651,990)
Ending balance at Sep. 30, 2023		26,196,502	2,010,600	89,718	979	10,012,438	17,284,350	(941,878)	(2,259,705)
Beginning balance at Jun. 30, 2023		25,800,933	2,010,600	89,718	972	10,000,335	16,836,810	(864,800)	(2,272,702)
Total comprehensive income		612,863					689,941	(77,078)
Preferred stock cash dividends	[1]	(24,941)					(24,941)
Stock-based compensation transactions, net	[2]	24,638			7	12,103	(469)		12,997
Common stock cash dividends		(216,991)					(216,991)
Ending balance at Sep. 30, 2023		$ 26,196,502	$ 2,010,600	$ 89,718	$ 979	$ 10,012,438	$ 17,284,350	$ (941,878)	$ (2,259,705)

[1] For the three-month and nine-month periods ended September 30, 2023 , dividends per preferred share were: Preferred Series E - $ 16.125 and $ 48.375 , respectively; Preferred Series F - $ 128.125 and $ 384.375 , respectively; Preferred Series G - $ 125.00 and $ 375.00 , respectively; Preferred Series H - $ 0.3516 and $ 1.0547 , respectively; and Preferred Series I - $ 87.50 and $ 262.50 , respectively. Dividends per preferred share for the three-month and nine-month periods ended September 30, 2022 were: Preferred Series E - $ 16.125 and $ 48.375 , respectively; Preferred Series F - $ 128.125 and $ 384.375 , respectively; Preferred Series G - $ 125.00 and $ 375.00 , respectively; Preferred Series H - $ 0.3516 and $ 0.7031 , respectively; and Preferred Series I - $ 87.50 . and $ 269.31 , respectively. Effective January 1, 2023 amounts are inclusive of 1 % U.S. government excise taxes receivable or payable.

Consolidated Statement of Cha_2

Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Percentage of income taxes receivable or payable	1%		1%
Preferred Series E [Member]
Preferred stock per share dividend amount	$ 16.125	$ 16.125	$ 48.375	$ 48.375
Preferred Series F [Member]
Preferred stock per share dividend amount	128.125	128.125	384.375	384.375
Preferred Series G [Member]
Preferred stock per share dividend amount	125	125	375	375
Preferred Series I [Member]
Preferred stock per share dividend amount	87.5	87.5	262.5	269.31
Preferred Series H [Member]
Preferred stock per share dividend amount	0.3516	0.3516	1.0547	0.7031
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.3	$ 1.2	$ 3.9	$ 3.6

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)	$ 689,941	$ 646,596	$ 2,258,599	$ 1,226,292

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Significant accounting policies

Significant accounting policies	9 Months Ended
Significant accounting policies	Sep. 30, 2023
Accounting Policies [Abstract]
Significant accounting policies	1. Significant accounting policies The consolidated interim financial statements of the Company were compiled in accordance with GAAP using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2022 Annual Report, except as disclosed in note 16 of Notes to Financial Statements herein. The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company's financial position, results of operations and cash flows for the interim periods presented.

Acquisition and divestiture

Acquisition and divestiture	9 Months Ended
Acquisition and divestiture	Sep. 30, 2023
Business Combinations [Abstract]
Acquisition and divestiture	2. Acquisition and divestiture Acquisition On April 1, 2022, M&T completed the acquisition of People's United. Through subsidiaries, People's United provided commercial banking, retail banking and wealth management services to individual, corporate and municipal customers through a network of branches located in Connecticut, southeastern New York, Massachusetts, Vermont, New Hampshire and Maine. Following the merger, People's United Bank, National Association, a national banking association and a wholly owned subsidiary of People's United, merged with and into M&T Bank, the principal banking subsidiary of M&T, with M&T Bank as the surviving entity. The results of operations acquired from People's United have been included in the Company's financial results since April 1, 2022. Pursuant to the terms of the merger agreement dated February 22, 2021, People’s United shareholders received consideration valued at .118 of an M&T common share in exchange for each common share of People’s United. The purchase price totaled approximately $ 8.4 billion (with the price based on M&T’s closing price of $ 164.66 per share as of April 1, 2022). M&T issued 50,325,004 common shares in completing the transaction. Additionally, People’s United outstanding preferred stock was converted into new shares of Series H Preferred Stock of M&T. The acquisition of People's United expanded the Company's geographical footprint and management expects the Company will benefit from greater geographical diversity and the advantages of scale associated with a larger company. 2. Acquisition and divestiture, continued The People’s United transaction has been accounted for using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed and preferred stock converted were recorded at estimated fair value on the acquisition date. The consideration paid for People’s United common equity and the amounts of identifiable assets acquired, liabilities assumed and preferred stock converted as of the acquisition date follows: (In thousands) Consideration: Common stock issued ( 50,325,004 shares) $ 8,286,515 Common stock awards converted 104,810 Cash 1,824 Total consideration 8,393,149 Net assets acquired: Identifiable assets Cash and due from banks 395,747 Interest-bearing deposits at banks 9,193,346 Investment securities 11,574,689 Loans and leases 35,840,648 Core deposit and other intangible assets 261,000 Other assets 2,979,388 Total identifiable assets acquired 60,244,818 Liabilities and preferred stock Deposits 52,967,915 Borrowings 1,389,012 Other liabilities 1,142,387 Total liabilities assumed 55,499,314 Preferred stock 260,600 Total liabilities and preferred stock 55,759,914 Net assets acquired 4,484,904 Goodwill $ 3,908,245 GAAP requires loans and leases obtained through an acquisition that have experienced a more-than-insignificant deterioration in credit quality since origination be considered PCD. The Company considered several factors in the determination of PCD loans, including loan grades assigned to acquired commercial loans and leases and commercial real estate loans utilizing the Company's loan grading system and delinquency status and history for acquired loans backed by residential real estate. For PCD loans and leases, the initial estimate of expected credit losses of $ 99 million was established through an adjustment to increase both the initial carrying value and allowance for credit losses. GAAP also provides that an allowance for credit losses on loans acquired, but not classified as PCD, also be recognized above and beyond the impact of forecasted losses used in determining fair value. Accordingly, the Company recorded $ 242 million of provision for credit losses for non-PCD acquired loans and leases at the acquisition date. The following table reconciles the unpaid principal balance to the fair value of loans and leases at April 1, 2022: PCD Non-PCD (In thousands) Unpaid principal balance $ 3,410,506 (a) $ 32,896,454 Allowance for credit losses at acquisition ( 99,000 ) (a) — Other discount ( 106,814 ) ( 260,498 ) (b) Fair value $ 3,204,692 $ 32,635,956 (a) The unpaid principal balance and allowance for credit losses at acquisition is net of charge-offs of $ 33 million recognized on the PCD loans . (b) Includes approximately $ 242 million of principal balances not expected to be collected. 2. Acquisition and divestiture, continued In connection with the acquisition, the Company recorded approximately $ 3.9 billion of goodwill, which represents the excess of the purchase price over the fair value of the net assets acquired, and $ 261 million of core deposit and other intangible assets. The core deposit and other intangible assets are being amortized over periods of three to seven years . The following table presents certain pro forma information as if People’s United had been acquired on January 1, 2021. These results combine the historical results of People’s United into the Company’s Consolidated Statement of Income and, while adjustments were made for the estimated impact of certain fair valuation adjustments and other acquisition-related activity, they are not indicative of what would have occurred had the acquisition taken place as indicated. For example, merger-related expenses noted below are included in the periods where such expenses were incurred. Additionally, the Company expects to achieve operating cost savings and other business synergies as a result of the acquisition which are not reflected in the pro forma amounts that follow: Pro forma Nine months ended September 30, 2022 (In thousands) Total revenues (a) $ 6,134,400 Net income 1,399,913 (a) Represents the total of net interest income and other income. In connection with the People’s United acquisition, the Company incurred merger-related expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into the Company. Those expenses consisted largely of professional services, temporary help fees and other costs associated with actual or planned systems conversions and/or integration of operations and the introduction of the Company to its new customers; costs related to termination of existing contractual arrangements for various services; initial marketing and promotion expenses designed to introduce M&T Bank to its new customers; severance (for former People’s United employees); travel costs; and other costs of completing the trans action and commencing operations in new markets and offices. The Company did no t incur any People's United merger-related expenses during the three and nine months ended September 30, 2023 . Merger-related expenses incurred in the three and nine months ended September 30, 2022 totaled approximately $ 53 million and $ 293 million, respectively, and consisted predominantly of professional services, including legal expenses and technology-related activities to prepare for planned integration efforts, and severance for former People's United employees. The Company also recognized a $ 242 million provision for credit losses on acquired loans that were not deemed to be PCD on April 1, 2022. Divestiture On December 19, 2022 the Company announced that it had entered into a definitive agreement to sell its CIT business to a private equity firm. The transaction was completed on April 29, 2023 and resulted in a pre-tax gain of $ 225 million that has been included in other revenues from operations in the Consolidated Statement of Income for the nine-month period ended September 30, 2023 . Prior to the sale, the CIT business contributed $ 60 million and $ 121 million to trust income in the nine months ended September 30, 2023 and 2022 , respectively. After considering expenses, the results of operations from the CIT business were not material to the Company's consolidated results of operations in those periods.

Investment securities

Investment securities	9 Months Ended
Investment securities	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Investment securities	3. Investment securities The amortized cost and estimated fair value of investment securities were as follows: Amortized Gross Gross Estimated (In thousands) September 30, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,935,658 $ — $ 200,551 $ 7,735,107 Mortgage-backed securities: Government issued or guaranteed: Commercial 544,263 — 18,794 525,469 Residential 2,382,810 8 214,531 2,168,287 Other debt securities 176,235 146 12,835 163,546 11,038,966 154 446,711 10,592,409 Investment securities held to maturity: U.S. Treasury and federal agencies 1,001,991 — 48,706 953,285 Obligations of states and political subdivisions 2,511,784 — 219,149 2,292,635 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,031,532 — 233,055 1,798,477 Residential 9,979,882 — 1,306,934 8,672,948 Privately issued 44,319 9,041 7,374 45,986 Other debt securities 1,612 — — 1,612 15,571,120 9,041 1,815,218 13,764,943 Total debt securities $ 26,610,086 $ 9,195 $ 2,261,929 $ 24,357,352 Equity and other securities: Readily marketable equity — at fair value $ 260,688 $ 2,425 $ 3,897 $ 259,216 Other — at cost 913,358 — — 913,358 Total equity and other securities $ 1,174,046 $ 2,425 $ 3,897 $ 1,172,574 December 31, 2022 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,913,932 $ 200 $ 243,172 $ 7,670,960 Mortgage-backed securities: Government issued or guaranteed: Commercial 594,779 — 20,480 574,299 Residential 2,501,334 65 171,281 2,330,118 Other debt securities 183,107 250 9,773 173,584 11,193,152 515 444,706 10,748,961 Investment securities held to maturity: U.S. Treasury and federal agencies 1,054,035 — 45,747 1,008,288 Obligations of states and political subdivisions 2,577,078 4 116,512 2,460,570 Mortgage-backed securities: Government issued or guaranteed: Commercial 912,431 — 103,528 808,903 Residential 8,934,918 1,451 891,063 8,045,306 Privately issued 49,742 8,833 7,987 50,588 Other debt securities 1,765 — — 1,765 13,529,969 10,288 1,164,837 12,375,420 Total debt securities $ 24,723,121 $ 10,803 $ 1,609,543 $ 23,124,381 Equity and other securities: Readily marketable equity — at fair value $ 153,283 $ 2,120 $ 3,945 $ 151,458 Other — at cost 780,483 — — 780,483 Total equity and other securities $ 933,766 $ 2,120 $ 3,945 $ 931,941 3. Investment securities, continued There were no significant gross realized gains or losses from sales of investment securities for the three-month and nine-month periods ended September 30, 2023 and 2022. Unrealized losses on equity securities are included in gain (loss) on bank investment securities in the Consolidated Statement of Income. At September 30, 2023, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows: Amortized Estimated (In thousands) Debt securities available for sale: Due in one year or less $ 4,619,339 $ 4,544,581 Due after one year through five years 3,437,580 3,306,540 Due after five years through ten years 24,974 22,400 Due after ten years 30,000 25,132 8,111,893 7,898,653 Mortgage-backed securities available for sale 2,927,073 2,693,756 $ 11,038,966 $ 10,592,409 Debt securities held to maturity: Due in one year or less $ 14,164 $ 13,967 Due after one year through five years 1,151,126 1,097,310 Due after five years through ten years 1,306,208 1,223,790 Due after ten years 1,043,889 912,465 3,515,387 3,247,532 Mortgage-backed securities held to maturity 12,055,733 10,517,411 $ 15,571,120 $ 13,764,943 3. Investment securities, continued A summary of investment securities that as of September 30, 2023 and December 31, 2022 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows: Less Than 12 Months 12 Months or More Fair Unrealized Fair Unrealized (In thousands) September 30, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 226,045 $ 3,741 $ 7,509,062 $ 196,810 Mortgage-backed securities: Government issued or guaranteed: Commercial 81,949 5,146 443,520 13,648 Residential 240,610 13,246 1,926,504 201,285 Other debt securities 6,553 202 152,192 12,633 555,157 22,335 10,031,278 424,376 Investment securities held to maturity: U.S. Treasury and federal agencies 48,825 1,193 904,460 47,513 Obligations of states and political subdivisions 235,273 15,423 2,055,317 203,726 Mortgage-backed securities: Government issued or guaranteed: Commercial 1,015,480 97,998 782,997 135,057 Residential 2,570,788 146,021 6,102,160 1,160,913 Privately issued 1,927 82 32,081 7,292 3,872,293 260,717 9,877,015 1,554,501 Total $ 4,427,450 $ 283,052 $ 19,908,293 $ 1,978,877 December 31, 2022 Investment securities available for sale: U.S. Treasury and federal agencies $ 6,706,413 $ 183,760 $ 841,945 $ 59,412 Mortgage-backed securities: Government issued or guaranteed: Commercial 574,299 20,480 — — Residential 2,295,873 169,489 28,305 1,792 Other debt securities 93,458 3,604 73,280 6,169 9,670,043 377,333 943,530 67,373 Investment securities held to maturity: U.S. Treasury and federal agencies 1,008,288 45,747 — — Obligations of states and political subdivisions 2,449,420 116,512 — — Mortgage-backed securities: Government issued or guaranteed: Commercial 808,903 103,528 — — Residential 6,292,462 619,403 1,319,300 271,660 Privately issued — — 35,661 7,987 10,559,073 885,190 1,354,961 279,647 Total $ 20,229,116 $ 1,262,523 $ 2,298,491 $ 347,020 3. Investment securities, continued The Company owned 4,279 individual debt securities with aggregate gross unrealized losses of $ 2.3 billion at September 30, 2023. Based on a review of each of the securities in the investment securities portfolio at September 30, 2023, the Company concluded that it expected to recover the amortized cost basis of its investment. As of September 30, 2023, the Company does not intend to sell nor is it anticipated that it would be required to sell any of its impaired investment securities at a loss. At September 30, 2023 , the Company has not identified events or changes in circumstances which may have a significant adverse effect on the fair value of the $ 913 million of cost method equity securities. The Company estimated no material allowance for credit losses for its investment securities classified as held-to-maturity at September 30, 2023 or December 31, 2022. At September 30, 2023 and December 31, 2022 investment securities with carrying values of $ 8.2 billion (including $ 696 million related to repurchase transactions) and $ 7.9 billion (including $ 567 million related to repurchase transactions), respectively, were pledged to secure borrowings, lines of credit and governmental deposits.

Loans and leases and the allowa

Loans and leases and the allowance for credit losses	9 Months Ended
Loans and leases and the allowance for credit losses	Sep. 30, 2023
Receivables [Abstract]
Loans and leases and the allowance for credit losses	4. Loans and leases and the allowance for credit losses A summary of current, past due and nonaccrual loans as of September 30, 2023 and December 31, 2022 follows: Current 30-89 Days Accruing Past Nonaccrual Total (In thousands) September 30, 2023 Commercial, financial, leasing, etc. $ 44,298,562 $ 252,987 $ 21,064 $ 485,420 $ 45,058,033 Real estate: Commercial 34,018,257 424,005 65,426 1,236,087 35,743,775 Residential builder and developer 1,090,355 6,786 — 3,353 1,100,494 Other commercial construction 6,371,793 221,532 — 136,004 6,729,329 Residential 21,342,546 645,696 261,290 240,753 22,490,285 Residential — limited documentation 865,988 29,747 — 62,250 957,985 Consumer: Home equity lines and loans 4,578,381 36,014 — 78,316 4,692,711 Recreational finance 9,448,458 67,149 — 30,524 9,546,131 Automobile 3,855,578 46,257 — 15,959 3,917,794 Other 2,040,303 18,324 6,249 53,272 2,118,148 Total $ 127,910,221 $ 1,748,497 $ 354,029 $ 2,341,938 $ 132,354,685 December 31, 2022 Commercial, financial, leasing, etc. $ 40,982,398 $ 448,462 $ 72,502 $ 347,204 $ 41,850,566 Real estate: Commercial 34,972,627 311,188 67,696 1,396,662 36,748,173 Residential builder and developer 1,304,798 8,703 — 1,229 1,314,730 Other commercial construction 6,936,661 239,521 549 124,937 7,301,668 Residential 21,491,506 595,897 345,402 272,090 22,704,895 Residential — limited documentation 950,782 22,456 — 77,814 1,051,052 Consumer: Home equity lines and loans 4,891,311 30,787 — 84,788 5,006,886 Recreational finance 8,974,171 54,593 — 44,630 9,073,394 Automobile 4,393,206 44,486 — 39,584 4,477,276 Other 1,958,196 22,961 4,869 49,497 2,035,523 Total $ 126,855,656 $ 1,779,054 $ 491,018 $ 2,438,435 $ 131,564,163 4. Loans and leases and the allowance for credit losses, continued One-to-four family residential mortgage loans held for sale were $ 205 million and $ 32 million at September 30, 2023 and December 31, 2022, respectively. Commercial real estate loans held for sale were $ 226 million at September 30, 2023 and $ 131 million at December 31, 2022. Credit quality indicators The Company utilizes a loan grading system to differentiate risk amongst its commercial loans and commercial real estate loans. Loans with a lower expectation of default are assigned one of ten possible “pass” loan grades and are generally ascribed lower loss factors when determining the allowance for credit losses. Loans with an elevated level of credit risk are classified as “criticized” and are ascribed a higher loss factor when determining the allowance for credit losses. Criticized loans may be classified as “nonaccrual” if the Company no longer expects to collect all amounts according to the contractual terms of the loan agreement or the loan is delinquent 90 days or more. Line of business personnel in different geographic locations with support from and review by the Company’s credit risk personnel review and reassign loan grades based on their detailed knowledge of individual borrowers and their judgment of the impact on such borrowers resulting from changing conditions in their respective regions. Factors considered in assigning loan grades include borrower-specific information related to expected future cash flows and operating results, collateral values, geographic location, financial condition and performance, payment status, and other information. The Company’s policy is that at least annually, updated financial information be obtained from commercial borrowers associated with pass grade loans and additional analysis performed. On a quarterly basis, the Company’s credit personnel review all criticized commercial loans and commercial real estate loans greater than $ 5 million to determine the appropriateness of the assigned loan grade, including whether the loan should be reported as accruing or nonaccruing. 4. Loans and leases and the allowance for credit losses, continued The following table summarizes the loan grades applied at September 30, 2023 to the various classes of the Company’s commercial loans and commercial real estate loans and gross charge-offs for those types of loans for the three-month and nine-month periods ended September 30, 2023 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2023 2022 2021 2020 2019 Prior Loans Loans Total (In thousands) Commercial, financial, leasing, etc.: Loan grades: Pass $ 5,789,909 7,017,863 4,114,909 1,510,693 1,238,701 1,995,635 20,869,512 56,263 $ 42,593,485 Criticized accrual 109,004 264,016 180,450 113,930 99,434 307,309 878,730 26,255 1,979,128 Criticized nonaccrual 12,337 57,857 42,081 33,338 21,447 68,028 240,285 10,047 485,420 Total commercial, $ 5,911,250 7,339,736 4,337,440 1,657,961 1,359,582 2,370,972 21,988,527 92,565 $ 45,058,033 Gross charge-offs three months ended September 30, 2023 $ 2,124 7,929 2,998 1,766 2,539 3,300 6,188 — $ 26,844 Gross charge-offs nine months ended September 30, 2023 $ 2,959 18,887 11,108 8,518 7,056 11,615 6,961 — $ 67,104 Real estate: Commercial: Loan grades: Pass $ 2,553,454 3,578,095 2,989,307 2,978,906 4,446,005 12,208,078 710,648 — $ 29,464,493 Criticized accrual 725 630,132 478,637 494,243 905,654 2,510,960 22,844 — 5,043,195 Criticized nonaccrual 245 54,904 14,255 159,956 151,052 831,527 24,148 — 1,236,087 Total commercial real $ 2,554,424 4,263,131 3,482,199 3,633,105 5,502,711 15,550,565 757,640 — $ 35,743,775 Gross charge-offs three months ended September 30, 2023 $ — — — — — 48,093 — — $ 48,093 Gross charge-offs nine months ended September 30, 2023 $ — — — 424 77,906 100,004 — — $ 178,334 Residential builder and developer: Loan grades: Pass $ 433,338 337,680 67,233 6,818 2,050 13,503 133,839 — $ 994,461 Criticized accrual 310 11,867 25,379 — 64,125 336 663 — 102,680 Criticized nonaccrual — — 2,835 — 518 — — — 3,353 Total residential builder $ 433,648 349,547 95,447 6,818 66,693 13,839 134,502 — $ 1,100,494 Gross charge-offs three months ended September 30, 2023 $ — 245 — — — — — — $ 245 Gross charge-offs nine months ended September 30, 2023 $ — 245 — — — 55 1,678 — $ 1,978 Other commercial construction: Loan grades: Pass $ 636,314 1,481,975 1,023,831 676,613 465,423 204,511 20,171 — $ 4,508,838 Criticized accrual 7,180 130,644 184,379 531,138 837,446 393,700 — — 2,084,487 Criticized nonaccrual — — 10,018 46,626 50,165 26,237 2,958 — 136,004 Total other commercial $ 643,494 1,612,619 1,218,228 1,254,377 1,353,034 624,448 23,129 — $ 6,729,329 Gross charge-offs three months ended September 30, 2023 $ — — — — 3,236 — — — $ 3,236 Gross charge-offs nine months ended September 30, 2023 $ — — — — 3,236 — — — $ 3,236 The Company considers repayment performance a significant indicator of credit quality for its residential real estate loan and consumer loan portfolios. A summary of loans in accrual and nonaccrual status at September 30, 2023 for the various classes of the Company’s residential real estate loans and consumer loans and gross charge-offs for those types of loans for the three-month and nine-month periods ended September 30, 2023 by origination year follows: 4. Loans and leases and the allowance for credit losses, continued Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2023 2022 2021 2020 2019 Prior Loans Loans Total (In thousands) Residential: Current $ 1,349,605 4,827,335 3,817,652 2,605,414 1,240,538 7,419,338 82,664 — $ 21,342,546 30-89 days past due 8,385 87,178 68,811 41,367 22,082 416,816 1,057 — 645,696 Accruing loans past due 913 27,348 19,355 13,736 13,169 186,769 — — 261,290 Nonaccrual 971 14,353 13,730 3,500 8,529 192,207 7,463 — 240,753 Total residential $ 1,359,874 4,956,214 3,919,548 2,664,017 1,284,318 8,215,130 91,184 — $ 22,490,285 Gross charge-offs three months ended September 30, 2023 $ — 31 — — — 248 — — $ 279 Gross charge-offs nine months ended September 30, 2023 $ — 164 192 21 139 2,173 — — $ 2,689 Residential - limited documentation: Current $ — — — — — 865,988 — — $ 865,988 30-89 days past due — — — — — 29,747 — — 29,747 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 62,250 — — 62,250 Total residential - limited $ — — — — — 957,985 — — $ 957,985 Gross charge-offs three months ended September 30, 2023 $ — — — — — 1,053 — — $ 1,053 Gross charge-offs nine months ended September 30, 2023 $ — — — — — 1,416 — — $ 1,416 Consumer: Home equity lines and loans: Current $ 75 27 1,918 1,874 13,594 103,236 3,032,468 1,425,189 $ 4,578,381 30-89 days past due — — — 144 232 2,104 — 33,534 36,014 Accruing loans past due — — — — — — — — — Nonaccrual — — 19 — 27 6,091 1,158 71,021 78,316 Total home equity lines and loans $ 75 27 1,937 2,018 13,853 111,431 3,033,626 1,529,744 $ 4,692,711 Gross charge-offs three months ended September 30, 2023 $ — — — — — — — 1,522 $ 1,522 Gross charge-offs nine months ended September 30, 2023 $ — — — — — 84 1,298 3,339 $ 4,721 Recreational finance: Current $ 1,824,498 2,438,925 1,944,826 1,344,923 820,557 1,074,729 — — $ 9,448,458 30-89 days past due 5,564 11,669 15,168 12,145 7,973 14,630 — — 67,149 Accruing loans past due — — — — — — — — — Nonaccrual 1,138 3,935 6,338 5,477 4,013 9,623 — — 30,524 Total recreational finance $ 1,831,200 2,454,529 1,966,332 1,362,545 832,543 1,098,982 — — $ 9,546,131 Gross charge-offs three months ended September 30, 2023 $ 1,261 3,415 3,475 2,377 1,872 3,673 — — $ 16,073 Gross charge-offs nine months ended September 30, 2023 $ 2,134 8,565 9,502 8,108 6,035 11,030 — — $ 45,374 Automobile: Current $ 653,170 1,192,810 1,164,074 489,259 236,991 119,274 — — $ 3,855,578 30-89 days past due 3,019 12,198 13,492 6,866 5,582 5,100 — — 46,257 Accruing loans past due — — — — — — — — — Nonaccrual 1,148 2,679 4,632 2,525 2,217 2,758 — — 15,959 Total automobile $ 657,337 1,207,687 1,182,198 498,650 244,790 127,132 — — $ 3,917,794 Gross charge-offs three months ended September 30, 2023 $ 476 1,584 1,288 625 436 579 — — $ 4,988 Gross charge-offs nine months ended September 30, 2023 $ 557 4,403 5,272 2,502 1,919 1,977 — — $ 16,630 Other: Current $ 209,451 200,204 128,475 38,232 19,931 19,668 1,421,161 3,181 $ 2,040,303 30-89 days past due 2,592 2,055 1,546 314 185 383 10,337 912 18,324 Accruing loans past due — — — — — 208 6,041 — 6,249 Nonaccrual 1,805 852 430 119 149 305 49,408 204 53,272 Total other $ 213,848 203,111 130,451 38,665 20,265 20,564 1,486,947 4,297 $ 2,118,148 Gross charge-offs three months ended September 30, 2023 $ 5,716 2,200 1,222 323 263 348 9,723 — $ 19,795 Gross charge-offs nine months ended September 30, 2023 $ 11,829 14,060 6,218 2,927 3,178 9,682 9,915 — $ 57,809 Total loans and leases at $ 13,605,150 22,386,601 16,333,780 11,118,156 10,677,789 29,091,048 27,515,555 1,626,606 $ 132,354,685 Total gross charge-offs for $ 9,577 15,404 8,983 5,091 8,346 57,294 15,911 1,522 $ 122,128 Total gross charge-offs for $ 17,479 46,324 32,292 22,500 99,469 138,036 19,852 3,339 $ 379,291 4. Loans and leases and the allowance for credit losses, continued The following table summarizes the loan grades applied at December 31, 2022 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2022 2021 2020 2019 2018 Prior Loans Loans Total (In thousands) Commercial, financial, leasing, etc.: Loan grades: Pass $ 8,575,130 4,952,758 2,024,603 1,796,047 817,569 1,970,947 19,444,247 40,471 $ 39,621,772 Criticized accrual 247,626 222,861 190,368 116,881 71,485 246,846 768,497 17,026 1,881,590 Criticized nonaccrual 18,379 52,067 37,608 36,241 35,689 59,146 100,972 7,102 347,204 Total commercial, $ 8,841,135 5,227,686 2,252,579 1,949,169 924,743 2,276,939 20,313,716 64,599 $ 41,850,566 Real estate: Commercial: Loan grades: Pass $ 4,136,890 3,379,900 3,388,590 4,557,065 3,293,380 10,905,956 869,981 — $ 30,531,762 Criticized accrual 324,652 463,484 467,557 688,239 937,421 1,890,297 48,099 — 4,819,749 Criticized nonaccrual 11,541 22,459 183,986 297,106 170,382 688,079 23,109 — 1,396,662 Total commercial real $ 4,473,083 3,865,843 4,040,133 5,542,410 4,401,183 13,484,332 941,189 — $ 36,748,173 Residential builder and developer: Loan grades: Pass $ 680,705 230,079 11,280 22,111 12,812 9,865 150,404 — $ 1,117,256 Criticized accrual 2,969 28,472 9,952 108,968 15,069 — 30,815 — 196,245 Criticized nonaccrual 57 654 — 518 — — — — 1,229 Total residential builder $ 683,731 259,205 21,232 131,597 27,881 9,865 181,219 — $ 1,314,730 Other commercial construction: Loan grades: Pass $ 1,032,774 1,080,141 1,225,845 1,185,685 366,686 297,355 15,575 — $ 5,204,061 Criticized accrual 37,893 145,199 320,463 1,025,371 299,350 144,394 — — 1,972,670 Criticized nonaccrual — 9,992 44,037 35,841 10,542 22,099 2,426 — 124,937 Total other commercial $ 1,070,667 1,235,332 1,590,345 2,246,897 676,578 463,848 18,001 — $ 7,301,668 4. Loans and leases and the allowance for credit losses, continued A summary of loans in accrual and nonaccrual status at December 31, 2022 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2022 2021 2020 2019 2018 Prior Loans Loans Total (In thousands) Residential: Current $ 5,071,379 4,001,652 2,717,371 1,392,866 753,908 7,523,890 30,440 — $ 21,491,506 30-89 days past due 59,477 51,308 40,337 21,849 23,126 399,301 499 — 595,897 Accruing loans past due 12,012 39,934 20,067 14,050 14,007 245,332 — — 345,402 Nonaccrual 5,686 10,865 2,583 9,860 4,650 231,093 7,353 — 272,090 Total residential $ 5,148,554 4,103,759 2,780,358 1,438,625 795,691 8,399,616 38,292 — $ 22,704,895 Residential - limited documentation: Current $ — — — — — 950,782 — — $ 950,782 30-89 days past due — — — — — 22,456 — — 22,456 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 77,814 — — 77,814 Total residential - limited $ — — — — — 1,051,052 — — $ 1,051,052 Consumer: Home equity lines and Current $ 930 2,109 2,441 15,361 23,321 97,282 3,262,533 1,487,334 $ 4,891,311 30-89 days past due — — — 171 126 2,030 — 28,460 30,787 Accruing loans past due — — — — — — — — — Nonaccrual — 15 — 536 334 6,458 2,799 74,646 84,788 Total home equity lines and $ 930 2,124 2,441 16,068 23,781 105,770 3,265,332 1,590,440 $ 5,006,886 Recreational finance: Current $ 2,842,091 2,280,627 1,587,629 963,907 486,964 812,953 — — $ 8,974,171 30-89 days past due 8,648 9,525 12,412 8,387 5,202 10,419 — — 54,593 Accruing loans past due — — — — — — — — — Nonaccrual 3,533 7,440 9,427 7,625 5,344 11,261 — — 44,630 Total recreational finance $ 2,854,272 2,297,592 1,609,468 979,919 497,510 834,633 — — $ 9,073,394 Automobile: Current $ 1,491,076 1,557,676 702,711 378,962 167,438 95,343 — — $ 4,393,206 30-89 days past due 6,926 13,324 7,284 7,239 5,464 4,249 — — 44,486 Accruing loans past due — — — — — — — — — Nonaccrual 2,493 10,698 7,372 7,520 5,620 5,881 — — 39,584 Total automobile $ 1,500,495 1,581,698 717,367 393,721 178,522 105,473 — — $ 4,477,276 Other: Current $ 274,530 172,238 58,339 38,439 8,217 23,163 1,375,049 8,221 $ 1,958,196 30-89 days past due 3,783 1,450 326 386 141 569 15,655 651 22,961 Accruing loans past due — — — — — 226 4,643 — 4,869 Nonaccrual 2,745 830 332 371 120 465 44,449 185 49,497 Total other $ 281,058 174,518 58,997 39,196 8,478 24,423 1,439,796 9,057 $ 2,035,523 Total loans and leases at $ 24,853,925 18,747,757 13,072,920 12,737,602 7,534,367 26,755,951 26,197,545 1,664,096 $ 131,564,163 4. Loans and leases and the allowance for credit losses, continued Allowance for credit losses For purposes of determining the level of the allowance for credit losses, the Company evaluates its loan and lease portfolio by type. Changes in the allowance for credit losses for the three months ended September 30, 2023 and 2022 were as follows: Commercial, Real Estate Leasing, etc. Commercial Residential Consumer Total (In thousands) Three Months Ended September 30, 2023 Beginning balance $ 511,929 765,676 118,392 602,369 $ 1,998,366 Provision for credit losses 45,637 73,588 ( 3,390 ) 34,165 150,000 Net charge-offs Charge-offs ( 26,844 ) ( 51,574 ) ( 1,332 ) ( 42,378 ) ( 122,128 ) Recoveries 6,976 4,290 824 13,799 25,889 Net charge-offs ( 19,868 ) ( 47,284 ) ( 508 ) ( 28,579 ) ( 96,239 ) Ending balance $ 537,698 791,980 114,494 607,955 $ 2,052,127 Three Months Ended September 30, 2022 Beginning balance $ 414,473 708,393 124,326 576,598 $ 1,823,790 Provision for credit losses 43,343 26,949 ( 11,169 ) 55,877 115,000 Net charge-offs Charge-offs ( 37,396 ) ( 35,213 ) ( 2,572 ) ( 26,086 ) ( 101,267 ) Recoveries 22,022 401 2,234 13,411 38,068 Net charge-offs ( 15,374 ) ( 34,812 ) ( 338 ) ( 12,675 ) ( 63,199 ) Ending balance $ 442,442 700,530 112,819 619,800 $ 1,875,591 Changes in the allowance for credit losses for the nine months ended September 30, 2023 and 2022 were as follows: Commercial, Financial, Real Estate Leasing, etc. Commercial Residential Consumer Total (In thousands) Nine Months Ended September 30, 2023 Beginning balance $ 502,153 676,684 115,092 631,402 $ 1,925,331 Provision for credit losses 69,801 290,672 ( 955 ) 60,482 420,000 Net charge-offs Charge-offs ( 67,104 ) ( 183,548 ) ( 4,105 ) ( 124,534 ) ( 379,291 ) Recoveries 32,848 8,172 4,462 40,605 86,087 Net (charge-offs) recoveries ( 34,256 ) ( 175,376 ) 357 ( 83,929 ) ( 293,204 ) Ending balance $ 537,698 791,980 114,494 607,955 $ 2,052,127 Nine Months Ended September 30, 2022 Beginning balance $ 283,899 557,239 71,726 556,362 $ 1,469,226 Allowance on acquired PCD loans 41,003 55,812 1,833 352 99,000 Provision for credit losses (a) 167,985 116,288 40,719 102,008 427,000 Net charge-offs Charge-offs (b) ( 94,555 ) ( 45,809 ) ( 9,407 ) ( 78,148 ) ( 227,919 ) Recoveries 44,110 17,000 7,948 39,226 108,284 Net charge-offs ( 50,445 ) ( 28,809 ) ( 1,459 ) ( 38,922 ) ( 119,635 ) Ending balance $ 442,442 700,530 112,819 619,800 $ 1,875,591 ________________________________________________________________________________________________ (a) Includes $ 242 million related to non-PCD acquired loans for the nine months ended September 30, 2022. (b) For the nine months ended September 30, 2022, net charge-offs do not reflect $ 33 million of charge offs related to PCD acquired loans. 4. Loans and leases and the allowance for credit losses, continued Despite the allocation in the preceding tables, the allowance for credit losses is general in nature and is available to absorb losses from any loan or lease type. In determining the allowance for credit losses, accruing loans with similar risk characteristics are generally evaluated collectively. The Company utilizes statistically developed models to project principal balances over the remaining contractual lives of the loan portfolios and to determine estimated credit losses through a reasonable and supportable forecast period. Individual loan credit quality indicators, including loan grade and borrower repayment performance, can inform the models, which have been statistically developed based on historical correlations of credit losses with prevailing economic metrics, including unemployment, gross domestic product and real estate prices. Model forecasts may be adjusted for inherent limitations or biases that have been identified through independent validation and back-testing of model performance to actual realized results. At each of September 30, 2023 and December 31, 2022, the Company utilized a reasonable and supportable forecast period of two years. Subsequent to this forecast period the Company reverted, ratably over a one-year period, to historical loss experience to inform its estimate of losses for the remaining contractual life of each portfolio. The Company also estimates losses attributable to specific troubled credits identified through both normal and targeted credit review processes. The amounts of specific loss components in the Company’s loan and lease portfolios are determined through a loan-by-loan analysis of larger balance commercial loans and commercial real estate loans that are in nonaccrual status. Such loss estimates are typically based on expected future cash flows, collateral values and other factors that may impact the borrower’s ability to pay. To the extent that those loans are collateral-dependent, they are evaluated based on the fair value of the loan’s collateral as estimated at or near the financial statement date. As the quality of a loan deteriorates to the point of classifying the loan as “criticized,” the process of obtaining updated collateral valuation information is usually initiated, unless it is not considered warranted given factors such as the relative size of the loan, the characteristics of the collateral or the age of the last valuation. In those cases where current appraisals may not yet be available, prior appraisals are utilized with adjustments, as deemed necessary, for estimates of subsequent declines in values as determined by line of business and/or loan workout personnel. Those adjustments are reviewed and assessed for reasonableness by the Company’s credit risk personnel. Accordingly, for real estate collateral securing larger nonaccrual commercial loans and commercial real estate loans, estimated collateral values are based on current appraisals and estimates of value. For non-real estate loans, collateral is assigned a discounted estimated liquidation value and, depending on the nature of the collateral, is verified through field exams or other procedures. In assessing collateral, real estate and non-real estate values are reduced by an estimate of selling costs. For residential real estate loans, including home equity loans and lines of credit, the excess of the loan balance over the net realizable value of the property collateralizing the loan is charged-off when the loan becomes 150 days delinquent. That charge-off is based on recent indications of value from external parties that are generally obtained shortly after a loan becomes nonaccrual. Loans to consumers that file for bankruptcy are generally charged-off to estimated net collateral value shortly after the Company is notified of such filings. When evaluating individual home equity loans and lines of credit for charge-off and for purposes of estimating losses in determining the allowance for credit losses, the Company gives consideration to the required repayment of any first lien positions related to collateral property. Changes in the amount of the allowance for credit losses reflect the outcome of the procedures described herein, including the impact of changes in macroeconomic forecasts as compared with previous forecasts, as well as the impact of portfolio concentrations, imprecision in economic forecasts, geopolitical conditions and other risk factors that might influence the loss estimation process. The Company’s reserve for off-balance sheet credit exposures was not material at September 30, 2023 and December 31, 2022. 4. Loans and leases and the allowance for credit losses, continued Information with respect to loans and leases that were considered nonaccrual at the beginning and end of the reporting period and the interest income recognized on such loans for the three-month and nine-month periods ended September 30, 2023 and 2022 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized September 30, 2023 June 30, 2023 January 1, 2023 Three Months Ended September 30, 2023 Nine (In thousands) Commercial, financial, leasing, etc. $ 324,774 $ 160,646 $ 485,420 $ 416,022 $ 347,204 $ 3,726 $ 7,914 Real estate: Commercial 458,720 777,367 1,236,087 1,383,190 1,396,662 12,446 22,379 Residential builder and developer 3,353 — 3,353 1,193 1,229 — 396 Other commercial construction 4,080 131,924 136,004 146,024 124,937 249 1,974 Residential 90,879 149,874 240,753 238,509 272,090 3,480 12,247 Residential — limited documentation 21,634 40,616 62,250 66,614 77,814 426 686 Consumer: Home equity lines and loans 48,737 29,579 78,316 77,090 84,788 1,493 5,172 Recreational finance 20,955 9,569 30,524 32,286 44,630 185 536 Automobile 11,981 3,978 15,959 21,791 39,584 36 107 Other 53,100 172 53,272 52,862 49,497 66 233 Total $ 1,038,213 $ 1,303,725 $ 2,341,938 $ 2,435,581 $ 2,438,435 $ 22,107 $ 51,644 September 30, 2022 June 30, 2022 January 1, 2022 Three Months Ended September 30, 2022 Nine (In thousands) Commercial, financial, leasing, etc. $ 207,841 $ 160,325 $ 368,166 $ 442,496 $ 221,022 $ 4,708 $ 20,423 Real estate: Commercial 394,502 1,011,698 1,406,200 1,476,658 1,069,280 7,059 14,944 Residential builder and developer 1,930 — 1,930 518 3,005 — 1,687 Other commercial construction 25,235 40,952 66,187 73,046 111,405 22 3,398 Residential 160,704 124,691 285,395 331,376 355,858 8,059 21,397 Residential — limited documentation 61,297 34,085 95,382 112,608 122,888 229 456 Consumer: Home equity lines and loans 38,324 39,884 78,208 79,445 70,488 669 3,291 Recreational finance 31,295 7,423 38,718 33,414 27,811 166 488 Automobile 36,075 4,243 40,318 36,266 34,037 35 110 Other 48,741 81 48,822 47,178 44,289 84 268 Total $ 1,005,944 $ 1,423,382 $ 2,429,326 $ 2,633,005 $ 2,060,083 $ 21,031 $ 66,462 Loan modifications During the normal course of business, the Company modifies loans to maximize recovery efforts from borrowers experiencing financial difficulty. Such loan modifications typically include payment deferrals and interest rate reductions but may also include other modified terms. Those modified loans may be considered nonaccrual if the Company does not expect to collect the contractual cash flows owed under the loan agreement. On January 1, 2023 the Company adopted amended guidance that eliminated the accounting guidance for troubled debt restructurings while expanding disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. The amended guidance also requires disclosure of current period gross charge-offs by year of origination. 4. Loans and leases and the allowance for credit losses, continued The table that follows summarizes the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month and nine-month periods ended September 30, 2023: Amortized cost at September 30, 2023 Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) Percent of Total Loan Class at Period End (Dollars in thousands) Three Months Ended September 30, 2023 Commercial, financial, leasing, etc. $ 39,058 $ — $ — $ 1,204 $ 40,262 0.09 % Real estate: Commercial 273,201 — — 6,253 279,454 0.78 % Residential builder and developer — — — — — — Other commercial construction 215,598 — — — 215,598 3.20 % Residential 53,239 — — 1,446 54,685 0.24 % Residential — limited documentation 1,721 — — — 1,721 0.18 % Consumer: Home equity lines and loans 125 — — 150 275 0.01 % Recreational finance 40 — — — 40 — Automobile 61 — — — 61 — Other — — — — — — Total $ 583,043 $ — $ — $ 9,053 $ 592,096 0.45 % Nine Months Ended September 30, 2023 Commercial, financial, leasing, etc. $ 93,583 $ 381 $ — $ 1,659 $ 95,623 0.21 % Real estate: Commercial 440,195 — — 14,250 454,445 1.27 % Residential builder and developer 70,683 — — — 70,683 6.42 % Other commercial construction 431,668 — — 8,253 439,921 6.54 % Residential 120,632 — — 4,525 125,157 0.56 % Residential — limited documentation 9,971 — — 699 10,670 1.11 % Consumer: Home equity lines and loans 482 134 — 437 1,053 0.02 % Recreational finance 240 — — — 240 — Automobile 274 — — — 274 0.01 % Other — — — — — — Total $ 1,167,728 $ 515 $ — $ 29,823 $ 1,198,066 0.91 % (a) Predominantly payment deferrals combined with interest rate reductions. (b) Includes approximately $ 45 million and $ 92 million, respectively, of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2023 . 4. Loans and leases and the allowance for credit losses, continued The financial effects of the modifications for the three-month and nine-month periods ended September 30, 2023 include an increase in the weighted-average remaining term for commercial loans of 1.1 years and 1.0 years, respectively, for commercial real estate loans, inclusive of residential builder and development loans and other commercial construction loans, of 1.3 years and 1.2 years, respectively, and for residential real estate loans, of 11.5 years and 10.1 years, respectively. The following table summarizes the payment status, at September 30, 2023, of loans that were modified for the nine-month period ended September 30, 2023 : Payment status at September 30, 2023 (amortized cost) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Nine Months Ended September 30, 2023 (In thousands) Commercial, financial, leasing, etc. $ 81,558 $ 2,326 $ 11,739 $ 95,623 Real estate: Commercial 433,428 19,022 1,995 454,445 Residential builder and developer 70,683 — — 70,683 Other commercial construction 439,921 — — 439,921 Residential (b) 79,331 33,344 12,482 125,157 Residential — limited documentation 7,943 932 1,795 10,670 Consumer: Home equity lines and loans 1,034 19 — 1,053 Recreational finance 240 — — 240 Automobile 274 — — 274 Other — — — — Total $ 1,114,412 $ 55,643 $ 28,011 $ 1,198,066 (a) Predominantly loan modifications with payment deferrals. (b) Includes loans guaranteed by government-related entities classified as 30-89 days past due of $ 28 million and as past due 90 days or more of $ 11 million. Prior to January 1, 2023, if the borrower was experiencing financial difficulty such that the Company did not expect to collect the contractual cash flows owed under the original loan agreement and a concession in loan terms was granted, the Company considered the loan modification as a troubled debt restructuring. The table that follows summarizes the Company’s loan modification activities that were considered troubled debt restructurings for the three-month and nine-month periods ended September 30, 2022. The table is not comparative to the preceding table. The Company no longer designates modified loans as a troubled debt restructuring in conjunction with the adoption of amended accounting guidance on January 1, 2023. 4. Loans and leases and the allowance for credit losses, continued Post-modification (a) Number Pre- Principal Deferral Interest Rate Reduction Other Combination of Concession Types Total (Dollars in thousands) Three Months Ended September 30, 2022 Commercial, financial, leasing, etc. 70 $ 32,451 $ 11,237 $ 446 $ 229 $ 21,519 $ 33,431 Real estate: Commercial 14 22,951 7,222 — 122 15,543 22,887 Residential 57 14,380 11,094 — — 3,470 14,564 Residential — limited documentation 2 155 155 — — — 155 Consumer: Home equity lines and loans 25 1,700 1,504 — — 196 1,700 Recreational finance 167 6,937 6,937 — — — 6,937 Automobile 474 9,755 9,755 — — — 9,755 Other 30 371 371 — — — 371 Total 839 $ 88,700 $ 48,275 $ 446 $ 351 $ 40,728 $ 89,800 Nine Months Ended September 30, 2022 Commercial, financial, leasing, etc. 147 $ 79,437 $ 49,671 $ 455 $ 983 $ 30,262 $ 81,371 Real estate: Commercial 44 33,349 13,052 — 2,223 17,728 33,003 Residential 221 56,912 40,821 — — 18,469 59,290 Residential — limited documentation 7 1,231 1,049 — — 193 1,242 Consumer: — Home equity lines and loans 93 6,483 6,089 — — 461 6,550 Recreational finance 514 19,138 19,131 — — — 19,131 Automobile 1,537 29,789 29,759 — — — 29,759 Other 128 1,170 1,170 — — — 1,170 Total 2,691 $ 227,509 $ 160,742 $ 455 $ 3,206 $ 67,113 $ 231,516 _____________________________________________ (a) Financial effects impacting the recorded investment included principal payments or advances, ch arge-offs and capitalized escrow arrearages. The present value of interest rate concessions, discounted at the effective rate of the original loan, was not material. The amount of foreclosed property held by the Company, predominantly consisting of residential real estate, was $ 37 million and $ 41 million at September 30, 2023 and December 31, 2022 , respectively. There were $ 182 million and $ 201 million at September 30, 2023 and December 31, 2022, respectively, of loans secured by residential real estate that were in the process of foreclosure. Of all loans in the process of foreclosure at September 30, 2023 , approximately 35 % were government guaranteed. 4. Loans and leases and the allowance for credit losses, continued The Company pledged certain loans to secure outstanding borrowings and available lines of credit. At September 30, 2023 , the Company pledged approximately $ 13.1 billion of commercial loans and leases,

Borrowings

Borrowings	9 Months Ended
Borrowings	Sep. 30, 2023
Debt Disclosure [Abstract]
Borrowings	5. Borrowings September 30, 2023 December 31, 2022 (In thousands) Short-term borrowings Federal funds purchased and repurchase agreements $ 530,663 $ 354,670 FHLB Advances 6,200,000 3,200,281 Total short-term borrowings $ 6,730,663 $ 3,554,951 Long-term borrowings Asset-backed notes $ 516,668 $ — FHLB Advances 4,956 5,183 Senior notes - M&T 1,377,985 1,220,965 Senior notes - M&T Bank 3,741,161 1,249,141 Subordinated notes - M&T 76,339 77,337 Subordinated notes - M&T Bank 857,876 866,296 Junior subordinated debentures - M&T 538,932 536,080 Other 9,509 9,535 Total long-term borrowings $ 7,123,426 $ 3,964,537 In August 2023, a subsidiary of M&T Bank issued asset-backed notes secured by equipment finance loans and leases. A total of $ 550 million of such notes, representing the senior-most notes in the securitization, were purchased by third parties. Those asset-backed notes had a weighted average estimated life of approximately two years and a weighted average interest rate of 5.84 % at the time of securitization. Further information about this financing transaction is provided in note 11 of Notes to Financial Statements herein. In January 2023, M&T issued $ 1.0 billion of senior notes that mature in January 2034 and pay a 5.05 % fixed rate semi-annually until January 2033 after which SOFR plus 1.85 % will be paid quarterly until maturity. Additionally, in January 2023 M&T Bank issued $ 1.3 billion of senior notes that mature in January 2026 and pay a fixed rate of 4.65 % semi-annually until maturity and $ 1.2 billion of senior notes that mature in January 2028 and pay a fixed rate of 4.70 % semi-annually until maturity. In October 2023, M&T issued $ 750 million of senior notes that mature in October 2029 and pay a fixed rate of 7.41 % semi-annually until October 2028 after which SOFR plus 2.80 % will be paid quarterly until maturity. M&T Bank had secured borrowing facilities available with the FHLB of New York and the FRB of New York totaling approximately $ 14.3 billion and $ 15.8 billion, respectively, at September 30, 2023 . M&T Bank is required to pledge loans and investment securities as collateral for these borrowing facilities and could increase the availability under such facilities, or other available programs including the Bank Term Funding Program of the FRB of New York, by pledging additional assets.

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	6. Revenue from contracts with customers The Company generally charges customer accounts or otherwise bills customers upon completion of its services. Typically, the Company’s contracts with customers have a duration of one year or less and payment for services is received at least annually, but oftentimes more frequently as services are provided. At September 30, 2023 and December 31, 2022 , the Company had $ 61 million and $ 74 million, respectively, of amounts receivable related to recognized revenue from the sources in the accompanying tables. Such amounts are classified in accrued interest and other assets in the Company’s Consolidated Balance Sheet. In certain situations, the Company is paid in advance of providing services and defers the recognition of revenue until its service obligation is satisfied. At September 30, 2023 and December 31, 2022 , the Company had deferred revenue of $ 51 million and $ 48 million, respectively, related to the sources in the accompanying tables recorded in accrued interest and other liabilities in the Consolidated Balance Sheet. The following tables summarize sources of the Company’s noninterest income during the three-month and nine-month periods ended September 30, 2023 and 2022 that are subject to the revenue recognition accounting guidance. Business Banking Commercial Banking Commercial Real Estate Discretionary Portfolio Residential Mortgage Banking Retail Banking All Other Total Three Months Ended September 30, 2023 (In thousands) Classification in Consolidated Service charges on deposit accounts $ 21,749 31,237 4,551 — — 62,011 1,812 $ 121,360 Trust income 23 — — — — — 155,069 155,092 Brokerage services income — — — — — — 26,988 26,988 Other revenues from operations: Merchant discount and credit card fees 17,021 19,494 1,171 — — 4,795 360 42,841 Other — 5,839 942 13 125 7,605 765 15,289 $ 38,793 56,570 6,664 13 125 74,411 184,994 $ 361,570 Three Months Ended September 30, 2022 Classification in Consolidated Service charges on deposit accounts $ 19,277 30,406 3,683 — — 61,223 624 $ 115,213 Trust income — — — — — — 186,577 186,577 Brokerage services income — — — — — — 21,086 21,086 Other revenues from operations: Merchant discount and credit card fees 16,234 17,731 1,104 — — 6,874 561 42,504 Other — 9,878 1,961 904 558 3,980 8,767 26,048 $ 35,511 58,015 6,748 904 558 72,077 217,615 $ 391,428 Business Banking Commercial Banking Commercial Real Estate Discretionary Portfolio Residential Mortgage Banking Retail Banking All Other Total Nine Months Ended September 30, 2023 (In thousands) Classification in Consolidated Service charges on deposit accounts $ 62,097 89,940 13,163 — — 183,141 5,262 $ 353,603 Trust income 52 — — — — — 521,305 521,357 Brokerage services income — — — — — — 76,155 76,155 Other revenues from operations: Merchant discount and credit card fees 48,206 53,056 3,406 — — 16,345 992 122,005 Other — 16,441 3,460 51 676 22,679 2,922 46,229 $ 110,355 159,437 20,029 51 676 222,165 606,636 $ 1,119,349 Nine Months Ended September 30, 2022 Classification in Consolidated Service charges on deposit accounts $ 53,581 85,806 10,903 — — 185,990 4,610 $ 340,890 Trust income — — — — — — 545,874 545,874 Brokerage services income — — — — — — 65,414 65,414 Other revenues from operations: Merchant discount and credit card fees 45,874 48,044 2,836 — — 19,408 946 117,108 Other — 13,040 8,228 2,468 3,413 16,752 33,416 77,317 $ 99,455 146,890 21,967 2,468 3,413 222,150 650,260 $ 1,146,603

Pension plans and other postret

Pension plans and other postretirement benefits	9 Months Ended
Pension plans and other postretirement benefits	Sep. 30, 2023
Retirement Benefits [Abstract]
Pension plans and other postretirement benefits	7. Pension plans and other postretirement benefits The Company provides defined benefit pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic cost (benefit) for defined benefit plans consisted of the following: Pension Other Three Months Ended September 30 2023 2022 2023 2022 (In thousands) Service cost $ 2,837 $ 4,423 $ 400 $ 689 Interest cost on projected benefit obligation 28,862 22,060 703 581 Expected return on plan assets ( 50,315 ) ( 50,188 ) — — Amortization of prior service cost (credit) 52 129 ( 515 ) ( 693 ) Amortization of net actuarial loss (gain) ( 537 ) 4,974 ( 692 ) ( 370 ) Net periodic cost (benefit) $ ( 19,101 ) $ ( 18,602 ) $ ( 104 ) $ 207 Pension Other Nine Months Ended September 30 2023 2022 2023 2022 (In thousands) Service cost $ 8,512 $ 13,237 $ 1,200 $ 1,914 Interest cost on projected benefit obligation 86,585 60,407 2,109 1,607 Expected return on plan assets ( 150,945 ) ( 137,421 ) — — Amortization of prior service cost (credit) 155 387 ( 1,545 ) ( 2,079 ) Amortization of net actuarial loss (gain) ( 1,610 ) 14,921 ( 2,076 ) ( 1,111 ) Net periodic cost (benefit) $ ( 57,303 ) $ ( 48,469 ) $ ( 312 ) $ 331 Service cost is reflected in salaries and employee benefits expense in the Consolidated Statement of Income. The other components of net periodic benefit cost are reflected in other costs of operations. Expenses incurred in connection with the Company's defined contribution pension and retirement savings plans totaled $ 37 million and $ 32 million for the three months ended September 30, 2023 and 2022, respectively, and $ 118 million and $ 98 million for the nine months ended September 30, 2023 and 2022 , respectively, and are included in salaries and employee benefits expense.

Earnings per common share

Earnings per common share	9 Months Ended
Earnings per common share	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings per common share	8. Earnings per common share The computations of basic earnings per common share follow: Three Months Ended September 30 Nine Months Ended September 30 2023 2022 2023 2022 (In thousands, except per share) Income available to common shareholders: Net income $ 689,941 $ 646,596 $ 2,258,599 $ 1,226,292 Less: Preferred stock dividends ( 24,941 ) ( 24,941 ) ( 74,822 ) ( 71,647 ) Net income available to common equity 665,000 621,655 2,183,777 1,154,645 Less: Income attributable to unvested stock-based ( 1,237 ) ( 1,106 ) ( 3,975 ) ( 2,245 ) Net income available to common shareholders $ 663,763 $ 620,549 $ 2,179,802 $ 1,152,400 Weighted-average shares outstanding: Common shares outstanding (including common stock 166,217 174,921 166,787 160,793 Less: Unvested stock-based compensation awards ( 308 ) ( 312 ) ( 299 ) ( 319 ) Weighted-average shares outstanding 165,909 174,609 166,488 160,474 Basic earnings per common share $ 4.00 $ 3.55 $ 13.09 $ 7.18 The computations of diluted earnings per common share follow: Three Months Ended September 30 Nine Months Ended September 30 2023 2022 2023 2022 (In thousands, except per share) Net income available to common equity $ 665,000 $ 621,655 $ 2,183,777 $ 1,154,645 Less: Income attributable to unvested stock-based ( 1,234 ) ( 1,101 ) ( 3,965 ) ( 2,239 ) Net income available to common shareholders $ 663,766 $ 620,554 $ 2,179,812 $ 1,152,406 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock 166,217 174,921 166,787 160,793 Less: Unvested stock-based compensation awards ( 308 ) ( 312 ) ( 299 ) ( 319 ) Plus: Incremental shares from assumed conversion 661 1,073 605 821 Adjusted weighted-average shares outstanding 166,570 175,682 167,093 161,295 Diluted earnings per common share $ 3.98 $ 3.53 $ 13.05 $ 7.14 GAAP defines unvested share-based awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) as participating securities that shall be included in the computation of earnings per common share pursuant to the two-class method. The Company has issued stock-based compensation awards in the form of restricted stock and restricted stock units which, in accordance with GAAP, are considered participating securities. Stock-based compensation awards to purchase common stock of M&T representing 1,745,348 common shares and 1,800,385 common shares during the three-month and nine-month periods ended September 30, 2023 , respectively, and 252,793 and 314,155 common shares during the three-month and nine-month periods ended September 30, 2022 , respectively, were not included in the computations of diluted earnings per common share because the effect on those periods would have been antidilutive.

Comprehensive income

Comprehensive income	9 Months Ended
Comprehensive income	Sep. 30, 2023
Equity [Abstract]
Comprehensive income	9. Comprehensive income The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income: Investment Defined Benefit Total Income Securities Plans Other Before Tax Tax Net (In thousands) Balance — January 1, 2023 $ ( 444,192 ) ( 272,856 ) ( 349,129 ) $ ( 1,066,177 ) 276,147 $ ( 790,030 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 2,366 ) — — ( 2,366 ) 588 ( 1,778 ) Foreign currency translation adjustment — — 71 71 ( 18 ) 53 Unrealized losses on cash flow hedges — — ( 365,739 ) ( 365,739 ) 90,679 ( 275,060 ) Total other comprehensive income (loss) before ( 2,366 ) — ( 365,668 ) ( 368,034 ) 91,249 ( 276,785 ) Amounts reclassified from accumulated other comprehensive Accretion of net gain on terminated cash flow hedges — — ( 91 ) ( 91 ) (b) 23 ( 68 ) Net yield adjustment from cash flow hedges — — 173,051 173,051 (a) ( 43,535 ) 129,516 Amortization of prior service credit — ( 1,390 ) — ( 1,390 ) (c) 155 ( 1,235 ) Amortization of actuarial gains — ( 3,686 ) — ( 3,686 ) (c) 410 ( 3,276 ) Total other comprehensive income (loss) ( 2,366 ) ( 5,076 ) ( 192,708 ) ( 200,150 ) 48,302 ( 151,848 ) Balance — September 30, 2023 $ ( 446,558 ) ( 277,932 ) ( 541,837 ) $ ( 1,266,327 ) 324,449 $ ( 941,878 ) Balance — January 1, 2022 $ 104,691 ( 360,276 ) 83,531 $ ( 172,054 ) 44,476 $ ( 127,578 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 576,266 ) — — ( 576,266 ) 149,186 ( 427,080 ) Foreign currency translation adjustment — — ( 14,564 ) ( 14,564 ) 3,293 ( 11,271 ) Unrealized losses on cash flow hedges — — ( 429,310 ) ( 429,310 ) 111,150 ( 318,160 ) Total other comprehensive income (loss) before ( 576,266 ) — ( 443,874 ) ( 1,020,140 ) 263,629 ( 756,511 ) Amounts reclassified from accumulated other comprehensive Amortization of unrealized holding losses on 1,766 — — 1,766 (a) ( 456 ) 1,310 Accretion of net gain on terminated cash flow hedges — — ( 90 ) ( 90 ) (b) 24 ( 66 ) Net yield adjustment from cash flow hedges — — ( 35,500 ) ( 35,500 ) (a) 9,192 ( 26,308 ) Amortization of prior service credit — ( 1,692 ) — ( 1,692 ) (c) 413 ( 1,279 ) Amortization of actuarial losses — 13,810 — 13,810 (c) ( 3,371 ) 10,439 Total other comprehensive income (loss) ( 574,500 ) 12,118 ( 479,464 ) ( 1,041,846 ) 269,431 ( 772,415 ) Balance — September 30, 2022 $ ( 469,809 ) ( 348,158 ) ( 395,933 ) $ ( 1,213,900 ) 313,907 $ ( 899,993 ) (a) Included in interest income. (b) Included in interest expense. (c) Included in other costs of operations. Accumulated other comprehensive income (loss), net consisted of the following: Defined Investment Benefit Securities Plans Other Total (In thousands) Balance — December 31, 2022 $ ( 329,168 ) $ ( 202,186 ) $ ( 258,676 ) $ ( 790,030 ) Net loss during period ( 1,778 ) ( 4,511 ) ( 145,559 ) ( 151,848 ) Balance — September 30, 2023 $ ( 330,946 ) $ ( 206,697 ) $ ( 404,235 ) $ ( 941,878 )

Derivative financial instrument

Derivative financial instruments	9 Months Ended
Derivative financial instruments	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative financial instruments	10. Derivative financial instruments As part of managing interest rate risk, the Company enters into interest rate swap agreements to modify the repricing characteristics of certain portions of the Company’s portfolios of earning assets and interest-bearing liabilities. The Company designates interest rate swap agreements utilized in the management of interest rate risk as either fair value hedges or cash flow hedges. Interest rate swap agreements are generally entered into with counterparties that meet established credit standards and most contain master netting, collateral and/or settlement provisions protecting the at-risk party. Based on adherence to the Company’s credit standards and the presence of the netting, collateral or settlement provisions, the Company believes that the credit risk inherent in these contracts was not material as of September 30, 2023. The net effect of interest rate swap agreements was to decrease net interest income by $ 79 million and $ 211 million during the three-month and nine-month periods ended September 30, 2023, respectively, and to decrease net interest income by $ 22 million and to increase net interest income by $ 50 million during the three-month and nine-month periods ended September 30, 2022, respectively. Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows: Weighted- Estimated Notional Average Average Rate Fair Value Amount Maturity Fixed Variable Gain (Loss) (a) (In thousands) (In years) (In thousands) September 30, 2023 Fair value hedges: Fixed rate long-term borrowings (b) $ 2,000,000 6.6 3.11 % 5.74 % $ 3,108 Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (c) 23,977,000 2.0 3.45 % 5.32 % 9,077 Total $ 25,977,000 2.4 $ 12,185 December 31, 2022 Fair value hedges: Fixed rate long-term borrowings (b) $ 1,500,000 3.3 2.98 % 4.52 % $ ( 833 ) Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (d) 15,900,000 1.4 1.91 % 4.38 % ( 7,059 ) Total $ 17,400,000 1.6 $ ( 7,892 ) (a) Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such payments for interest rate swap agreements designated as fair value hedges was a net settlement of losses of $ 163.9 million at September 30, 2023 and $ 65.0 million at December 31, 2022. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of losses of $ 538.5 million at September 30, 2023 and $ 329.7 million at December 31, 2022. (b) Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate. (c) Includes notional amount and terms of $ 9.4 billion of forward-starting interest rate swap agreements that become effective in 2023 and 2024. (d) Includes notional amount and terms of $ 4.7 billion of forward-starting interest rate swap agreements that become effective in 2023. 10. Derivative financial instruments, continued The Company also has commitments to sell and commitments to originate residential and commercial real estate loans that are considered derivatives. The Company designates certain of the commitments to sell real estate loans as fair value hedges of real estate loans held for sale. The Company also utilizes commitments to sell real estate loans to offset the exposure to changes in the fair value of certain commitments to originate real estate loans for sale. Changes in unrealized gains and losses are included in mortgage banking revenues and, in general, are realized in subsequent periods as the related loans are sold and commitments satisfied. Other derivative financial instruments not designated as hedging instruments included interest rate contracts, foreign exchange and other option and futures contracts. Interest rate contracts not designated as hedging instruments had notional values of $ 44.2 billion and $ 45.1 billion at September 30, 2023 and December 31, 2022 , respectively. The notional amounts of foreign exchange and other option and futures contracts not designated as hedging instruments aggregated $ 1.5 billion and $ 1.7 billion at September 30, 2023 and December 31, 2022, respectively. Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows: Asset Derivatives Liability Derivatives Fair Value Fair Value September 30, December 31, September 30, December 31, 2023 2022 2023 2022 (In thousands) Derivatives designated and qualifying as hedging instruments (a) Interest rate swap agreements $ 12,471 $ 1,202 $ 286 $ 9,094 Commitments to sell real estate loans 5,998 3,037 614 9 18,469 4,239 900 9,103 Derivatives not designated and qualifying as hedging instruments (a) Mortgage banking: Mortgage-related commitments to originate real estate loans for sale 2,380 452 53,783 46,025 Commitments to sell real estate loans 60,036 51,410 83 14 62,416 51,862 53,866 46,039 Other: Interest rate contracts (b) 323,865 355,806 1,420,668 1,278,180 Foreign exchange and other option and futures contracts 15,552 24,062 14,361 22,004 339,417 379,868 1,435,029 1,300,184 Total derivatives $ 420,302 $ 435,969 $ 1,489,795 $ 1,355,326 (a) Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities. (b) The impact of variation margin payments at September 30, 2023 and December 31, 2022 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $ 1.2 billion and $ 1.1 billion , respectively, as of each period end, and in a liability position of $ 15.7 million and $ 29.2 million , respectively. Amount of Gain (Loss) Recognized Three Months Ended September 30 2023 2022 Derivative Hedged Item Derivative Hedged Item (In thousands) Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 60,605 ) 60,737 $ ( 50,976 ) 50,821 Derivatives not designated as hedging instruments Interest rate contracts (b) $ 6,311 $ 6,946 Foreign exchange and other option and futures contracts (b) 4,232 4,462 Total $ 10,543 $ 11,408 10. Derivative financial instruments, continued Amount of Gain (Loss) Recognized Nine Months Ended September 30 2023 2022 Derivative Hedged Item Derivative Hedged Item (In thousands) Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 94,997 ) 95,920 $ ( 114,932 ) 114,581 Derivatives not designated as hedging instruments Interest rate contracts (b) $ 25,027 $ 17,907 Foreign exchange and other option and futures contracts (b) 11,377 10,701 Total $ 36,404 $ 28,608 (a) Reported as an adjustment to interest expense. (b) Reported as trading account and other non-hedging derivative gains. Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (In thousands) Location in the Consolidated Balance Sheet Hedges Long-term debt $ 1,834,030 $ 1,433,731 $ ( 161,230 ) $ ( 65,310 ) The amount of interest income recognized in the Consolidated Statement of Income associated with derivatives designated as cash flow hedges was a decrease of $ 65 million and $ 22 million for the three months ended September 30, 2023 and 2022, respectively, and a decrease of $ 173 million and an increase of $ 36 million for the nine-month period ended September 30, 2023 and 2022, respectively. As of September 30, 2023 the unrealized net loss recognized in other comprehensive income related to cash flow hedges was $ 529 million , of which losses of $ 13 million, $ 357 million and $ 159 million related to interest rate swap agreements maturing in 2024, 2025 and 2026, respectively. The Company does not offset derivative asset and liability positions in its consolidated financial statements. The Company’s exposure to credit risk by entering into derivative contracts is mitigated through master netting agreements and collateral posting or settlement requirements. Master netting agreements covering interest rate and foreign exchange contracts with the same party include a right to set-off that becomes enforceable in the event of default, early termination or under other specific conditions. 10. Derivative financial instruments, continued The aggregate fair value of derivative financial instruments in a liability position, which are subject to master netting arrangements and the related collateral posted, was not material at each of September 30, 2023 and December 31, 2022. Certain of the Company’s derivative financial instruments contain provisions that require the Company to maintain specific credit ratings from credit rating agencies to avoid higher collateral posting requirements. If the Company’s debt ratings were to fall below specified ratings, the counterparties of the derivative financial instruments could demand immediate incremental collateralization on those instruments in a net liability position. The aggregate fair value of all derivative financial instruments with such credit risk-related contingent features in a net liability position on September 30, 2023 was not material. The aggregate fair value of derivative financial instruments in an asset position with counterparties, which are subject to enforceable master netting arrangements, was $ 381 million at September 30, 2023 and $ 314 million at December 31, 2022 . Counterparties posted collateral relating to those positions of $ 386 million at September 30, 2023 and $ 312 million at December 31, 2022, respectively. Interest rate swap agreements entered into with customers are subject to the Company’s credit risk standards and often contain collateral provisions. In addition to the derivative contracts noted above, the Company clears certain derivative transactions through a clearinghouse, rather than directly with counterparties. Those transactions cleared through a clearinghouse require initial margin collateral and variation margin payments depending on the contracts being in a net asset or liability position. The amount of initial margin collateral posted by the Company was $ 143 million and $ 205 million at September 30, 2023 and December 31, 2022 , respectively. The fair value asset and liability amounts of derivative contracts have been reduced by variation margin payments treated as settlements as described herein. Variation margin on derivative contracts not treated as settlements continues to represent collateral posted or received by the Company.

Variable interest entities and

Variable interest entities and asset securitizations	9 Months Ended
Variable interest entities and asset securitizations	Sep. 30, 2023
Text Block [Abstract]
Variable interest entities and asset securitizations	11. Variable interest entities and asset securitizations The Company’s securitization activity includes securitizing loans originated for sale into government issued or guaranteed mortgage-backed securities. The Company has no t recognized any losses as a result of having securitized assets. In August 2023, a subsidiary of M&T Bank issued asset-backed notes secured by equipment finance loans and leases. Approximately $ 666 million of such loans and leases were sold into a special purpose trust which in turn issued asset-backed notes to investors. The loans and leases continue to be serviced by the subsidiary. A total of $ 550 million of such notes, representing the senior-most notes in the securitization, were purchased by third parties. Those asset-backed notes had a weighted average estimated life of approximately two years and a weighted average interest rate of 5.84 % at the time of securitization. Additionally, $ 88 million of asset-backed notes representing subordinate note classes and other residual interests were issued by the trust and retained by the Company. As a result of the retention of the subordinate interests and its continued role as servicer of the loans and leases, the Company is considered to be the primary beneficiary of the securitization trust and, accordingly, the trust has been included in the Company's consolidated financial statements. At September 30, 2023, the remaining balance of the loans and leases in trust was $ 643 million and the outstanding asset-backed notes issued to third party investors was $ 517 million. M&T has issued junior subordinated debentures payable to various trusts that have issued preferred capital securities. M&T owns the common securities of those trust entities. The Company is not considered to be the primary beneficiary of those entities and, accordingly, the trusts are not included in the Company’s consolidated financial statements. At each of September 30, 2023 and December 31, 2022, the Company included the junior subordinated debentures as “long-term borrowings” in its Consolidated Balance Sheet and recognized $ 22 million in other assets for its “investment” in the common securities of the trusts that will be concomitantly repaid to M&T by the respective trust from the proceeds of M&T’s repayment of the junior subordinated debentures associated with preferred capital securities. 11. Variable interest entities and asset securitizations, continued The Company has invested as a limited partner in various partnerships that collectively had total assets of approximately $ 9.8 billion at September 30, 2023 and $ 9.2 billion at December 31, 2022 . Those partnerships generally construct or acquire properties, including properties and facilities that produce renewable energy, for which the investing partners are eligible to receive certain federal income tax credits in accordance with government guidelines. State income tax credits may also be available in certain circumstances. Such investments also typically provide tax deductible losses to the partners. The partnership investments may also assist the Company in achieving its community reinvestment and sustainability initiatives. As a limited partner, there is no recourse to the Company by creditors of the partnerships. However, the tax credits that result from the Company’s investments in such partnerships are generally subject to recapture should a partnership fail to comply with the respective government regulations. The Company’s carrying amount of its investments in such partnerships was $ 1.4 billion and $ 1.5 billion at September 30, 2023 and December 31, 2022 , respectively, including $ 491 million and $ 545 million of unfunded commitments, at each of those respective dates. Contingent commitments to provide additional capital contributions to these partnerships were $ 49 million at September 30, 2023. The Company has not provided financial or other support to the partnerships that was not contractually required. The Company’s maximum exposure to loss from its investments in such partnerships as of September 30, 2023 was $ 2.1 billion, including possible recapture of certain tax credits. Management currently estimates that no material losses are probable as a result of the Company’s involvement with such entities. The Company, in its position as limited partner, does not direct the activities that most significantly impact the economic performance of the partnerships and, therefore, in accordance with the accounting provisions for variable interest entities, the partnership entities are not included in the Company’s consolidated financial statements. The Company’s investment in qualified affordable housing projects is amortized to income taxes in the Consolidated Statement of Income as tax credits and other tax benefits resulting from deductible losses associated with the projects are received. The Company amortized $ 46 million and $ 128 million of its investments in qualified affordable housing projects to income tax expense during the three-month and nine-month periods ended September 30, 2023 , respectively, and recognized $ 52 million and $ 147 million of tax credits and other tax benefits during those respective periods. Similarly, for the three-month and nine-month periods ended September 30, 2022, the Company amortized $ 37 million and $ 94 million of its investments in qualified affordable housing projects to income tax expense, respectively, and recognized $ 44 million and $ 108 million of tax credits and other tax benefits during those respective periods. The Company serves as investment advisor for certain registered money-market funds. The Company has no explicit arrangement to provide support to those funds but may waive portions of its allowable management fees as a result of market conditions.

Fair value measurements

Fair value measurements	9 Months Ended
Fair value measurements	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair value measurements	12. Fair value measurements GAAP permits an entity to choose to measure eligible financial instruments and other items at fair value. The Company has not made any fair value elections at September 30, 2023. Pursuant to GAAP, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three-level hierarchy exists in GAAP for fair value measurements based upon the inputs to the valuation of an asset or liability. • Level 1 — Valuation is based on quoted prices in active markets for identical assets and liabilities. • Level 2 — Valuation is determined from quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar instruments in markets that are not active or by model-based techniques in which all significant inputs are observable in the market. • Level 3 — Valuation is derived from model-based and other techniques in which at least one significant input is unobservable and which may be based on the Company's own estimates about the assumptions that market participants would use to value the asset or liability. 12. Fair value measurements, continued When available, the Company attempts to use quoted market prices in active markets to determine fair value and classifies such items as Level 1 or Level 2. If quoted market prices in active markets are not available, fair value is often determined using model-based techniques incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using model-based techniques are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. The following is a description of the valuation methodologies used for the Company's assets and liabilities that are measured on a recurring basis at estimated fair value. Trading account Mutual funds held in connection with deferred compensation and other arrangements have been classified as Level 1 valuations. Valuations of investments in debt securities can generally be obtained through reference to quoted prices in less active markets for the same or similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. Investment securities available for sale and equity securities The majority of the Company's available-for-sale investment securities have been valued by reference to prices for similar securities or through model-based techniques in which all significant inputs are observable and, therefore, such valuations have been classified as Level 2. Certain investments in mutual funds and equity securities are actively traded and, therefore, have been classified as Level 1 valuations. Real estate loans held for sale The Company utilizes commitments to sell real estate loans to hedge the exposure to changes in fair value of real estate loans held for sale. The carrying value of hedged real estate loans held for sale includes changes in estimated fair value during the hedge period. Typically, the Company attempts to hedge real estate loans held for sale from the date of close through the sale date. The fair value of hedged real estate loans held for sale is generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans with similar characteristics and, accordingly, such loans have been classified as a Level 2 valuation. Commitments to originate real estate loans for sale and commitments to sell real estate loans The Company enters into various commitments to originate real estate loans for sale and commitments to sell real estate loans. Such commitments are accounted for as derivative financial instruments and, therefore, are carried at estimated fair value on the Consolidated Balance Sheet. The estimated fair values of such commitments were generally calculated by reference to quoted prices in secondary markets for commitments to sell real estate loans to certain government-sponsored entities and other parties. The fair valuations of commitments to sell real estate loans generally result in a Level 2 classification. The estimated fair value of commitments to originate real estate loans for sale are adjusted to reflect the Company's anticipated commitment expirations. The estimated commitment expirations are considered significant unobservable inputs contributing to the Level 3 classification of commitments to originate real estate loans for sale. Significant unobservable inputs used in the determination of estimated fair value of commitments to originate real estate loans for sale are included in the accompanying table of significant unobservable inputs to Level 3 measurements. Interest rate swap agreements used for interest rate risk management The Company utilizes interest rate swap agreements as part of the management of interest rate risk to modify the repricing characteristics of certain portions of its portfolios of earning assets and interest-bearing liabilities. The Company generally determines the fair value of its interest rate swap agreements using externally developed pricing models based on market observable inputs and, therefore, classifies such valuations as Level 2. The Company has considered counterparty credit risk in the valuation of its interest rate swap agreement assets and has considered its own credit risk in the valuation of its interest rate swap agreement liabilities. 12. Fair value measurements, continued Other non-hedging derivatives Other non-hedging derivatives consist primarily of interest rate contracts and foreign exchange contracts with customers who require such services with offsetting positions with third parties to minimize the Company's risk with respect to such transactions. The Company generally determines the fair value of its other non-hedging derivative assets and liabilities using externally developed pricing models based on market observable inputs and, therefore, classifies such valuations as Level 2. The following tables present assets and liabilities at September 30, 2023 and December 31, 2022 measured at estimated fair value on a recurring basis: Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) September 30, 2023 Trading account $ 136,998 $ 118,838 $ 18,160 $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,735,107 — 7,735,107 — Mortgage-backed securities: Government issued or guaranteed Commercial 525,469 — 525,469 — Residential 2,168,287 — 2,168,287 — Other debt securities 163,546 — 163,546 — 10,592,409 — 10,592,409 — Equity securities 259,216 252,080 7,136 — Real estate loans held for sale 430,720 — 430,720 — Other assets (a) 420,302 — 417,922 2,380 Total assets $ 11,839,645 $ 370,918 $ 11,466,347 $ 2,380 Other liabilities (a) 1,489,795 — 1,436,012 53,783 Total liabilities $ 1,489,795 $ — $ 1,436,012 $ 53,783 December 31, 2022 Trading account $ 117,847 $ 117,847 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,670,960 — 7,670,960 — Mortgage-backed securities: Government issued or guaranteed Commercial 574,299 — 574,299 — Residential 2,330,118 — 2,330,118 — Other debt securities 173,584 — 173,584 — 10,748,961 — 10,748,961 — Equity securities 151,458 145,289 6,169 — Real estate loans held for sale 162,393 — 162,393 — Other assets (a) 435,969 — 435,517 452 Total assets $ 11,616,628 $ 263,136 $ 11,353,040 $ 452 Other liabilities (a) 1,355,326 — 1,309,301 46,025 Total liabilities $ 1,355,326 $ — $ 1,309,301 $ 46,025 (a) Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), interest rate and foreign exchange contracts not designated as hedging instruments (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3). 12. Fair value measurements, continued The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three and nine months ended September 30, 2023 and 2022 were as follows: Other Assets and Other Liabilities Three months ended Nine months ended September 30, September 30, September 30, September 30, (In thousands) Beginning balance $ ( 37,178 ) $ ( 24,181 ) $ ( 45,573 ) $ 6,440 Total gains (losses) realized/unrealized: Included in earnings (a) ( 10,155 ) ( 9,321 ) 6,301 ( 34,630 ) Transfers out of Level 3 (b) ( 4,070 ) ( 14,804 ) ( 12,131 ) ( 20,116 ) Ending balance $ ( 51,403 ) $ ( 48,306 ) $ ( 51,403 ) $ ( 48,306 ) Changes in net unrealized gains (losses) included in earnings $ ( 12,957 ) $ ( 17,160 ) $ ( 12,341 ) $ ( 48,108 ) ___________________________________________________________________________________________________________________________________________ (a) Reported as mortgage banking revenues in the Consolidated Statement of Income and includes the fair value of commitment issuances and expirations. (b) Transfers out of Level 3 consist of interest rate locks transferred to closed loans. The Company is required, on a nonrecurring basis, to adjust the carrying value of certain assets or provide valuation allowances related to certain assets using fair value measurements. The more significant of those assets follow. Loans Loans are generally not recorded at fair value on a recurring basis. Periodically, the Company records nonrecurring adjustments to the carrying value of loans based on fair value measurements for partial charge-offs of the uncollectable portions of those loans. Nonrecurring adjustments also include certain impairment amounts for collateral-dependent loans when establishing the allowance for credit losses. Such amounts are generally based on the fair value of the underlying collateral supporting the loan and, as a result, the carrying value of the loan less the calculated valuation amount does not necessarily represent the fair value of the loan. Real estate collateral is typically valued using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have been classified as Level 2, unless significant adjustments have been made to the valuation that are not readily observable by market participants. Non-real estate collateral supporting commercial loans generally consists of business assets such as receivables, inventory and equipment. Fair value estimations are typically determined by discounting recorded values of those assets to reflect estimated net realizable value considering specific borrower facts and circumstances and the experience of credit personnel in their dealings with similar borrower collateral liquidations. Such discounts were in the range of 10 % to 90 % with a weighted-average of 44 % at September 30, 2023. As these discounts are not readily observable and are considered significant, the valuations have been classified as Level 3. Automobile collateral is typically valued by reference to independent pricing sources based on recent sales transactions of similar vehicles and, accordingly, the related nonrecurring fair value measurement adjustments have been classified as Level 2. Collateral values for other consumer installment loans are generally estimated based on historical recovery rates for similar types of loans which at September 30, 2023 was 51 %. As these recovery rates are not readily observable by market participants, such valuation adjustments have been classified as Level 3. Loans subject to nonrecurring fair value measurement were $ 804 million at September 30, 2023 ($ 316 million and $ 488 million of which were classified as Level 2 and Level 3, respectively), $ 853 million at December 31, 2022 ($ 329 million and $ 524 million of which were classified as Level 2 and Level 3, respectively) and $ 706 million at September 30, 2022 ($ 439 million and $ 267 million of which were classified as Level 2 and Level 3, respectively). Changes in fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2023 were decreases of $ 116 million and $ 269 million for the three-month and nine-month periods ended September 30, 2023, respectively. Changes in the fair value recognized for partial charge-offs of loans and loan impairment reserves on loans held by the Company on September 30, 2022 were decreases of $ 38 million and $ 128 million for the three-month and nine-month periods ended September 30, 2022, respectively. 12. Fair value measurements, continued Assets taken in foreclosure of defaulted loans Assets taken in foreclosure of defaulted loans are primarily comprised of commercial and residential real property and are generally measured at the lower of cost or fair value less costs to sell. The fair value of the real property is generally determined using appraisals or other indications of value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace and the related nonrecurring fair value measurement adjustments have generally been classified as Level 2. Assets taken into foreclosure of defaulted loans subject to nonrecurring fair value measurement were not material at each of September 30, 2023 and 2022. Changes in fair value recognized for those foreclosed assets held by the Company were not material during the three-month and nine-month periods ended September 30, 2023 and 2022. Capitalized servicing rights Capitalized servicing rights are initially measured at fair value in the Company’s Consolidated Balance Sheet. The Company utilizes the amortization method to subsequently measure its capitalized servicing assets. In accordance with GAAP, the Company must record impairment charges, on a nonrecurring basis, when the carrying value of certain strata exceed their estimated fair value. To estimate the fair value of servicing rights, the Company considers market prices for similar assets, if available, and the present value of expected future cash flows associated with the servicing rights calculated using assumptions that market participants would use in estimating future servicing income and expense. Such assumptions include estimates of the cost of servicing loans, loan default rates, an appropriate discount rate and prepayment speeds. For purposes of evaluating and measuring impairment of capitalized servicing rights, the Company stratifies such assets based on the predominant risk characteristics of the underlying financial instruments that are expected to have the most impact on projected prepayments, cost of servicing and other factors affecting future cash flows associated with the servicing rights. Such factors may include financial asset or loan type, note rate and term. The amount of impairment recognized is the amount by which the carrying value of the capitalized servicing rights for a stratum exceed estimated fair value. Impairment is recognized through a valuation allowance. The determination of fair value of capitalized servicing rights is considered a Level 3 valuation. Capitalized servicing rights related to residential mortgage loans required no valuation allowance at September 30, 2023 and December 31, 2022 . A reduction of the valuation allowance of $ 10 million and $ 24 million was recognized for the three-month and nine-month periods ended September 30, 2022, respectively. Significant unobservable inputs to Level 3 measurements The following table presents quantitative information about significant unobservable inputs used in the fair value measurements for certain Level 3 assets and liabilities at September 30, 2023 and December 31, 2022: Fair Value Valuation Unobservable Range (In thousands) September 30, 2023 Recurring fair value measurements Net other assets (liabilities) (a) $ ( 51,403 ) Discounted cash flow Commitment expirations 0 % - 99 % ( 8 %) December 31, 2022 Recurring fair value measurements Net other assets (liabilities) (a) $ ( 45,573 ) Discounted cash flow Commitment expirations 0 % - 97 % ( 3 %) (a) Other Level 3 assets (liabilities) consist of commitments to originate real estate loans. Sensitivity of fair value measurements to changes in unobservable inputs An increase (decrease) in the estimate of expirations for commitments to originate real estate loans would generally result in a lower (higher) fair value measurement. Estimated commitment expirations are derived considering loan type, changes in interest rates and remaining length of time until closing. 12. Fair value measurements, continued Disclosures of fair value of financial instruments The carrying amounts and estimated fair value for financial instrument assets (liabilities) are presented in the following tables: September 30, 2023 Carrying Estimated Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 1,768,864 1,768,864 1,701,427 67,437 — Interest-bearing deposits at banks 30,114,286 30,114,286 — 30,114,286 — Trading account 136,998 136,998 118,838 18,160 — Investment securities 27,336,103 25,529,926 252,080 25,231,860 45,986 Loans and leases: Commercial loans and leases 45,058,033 44,080,119 — — 44,080,119 Commercial real estate loans 43,573,598 41,273,080 — 226,022 41,047,058 Residential real estate loans 23,448,270 20,746,776 — 6,808,082 13,938,694 Consumer loans 20,274,784 19,351,349 — — 19,351,349 Allowance for credit losses ( 2,052,127 ) — — — — Loans and leases, net 130,302,558 125,451,324 — 7,034,104 118,417,220 Accrued interest receivable 734,036 734,036 — 734,036 — Financial liabilities: Noninterest-bearing deposits $ ( 53,786,987 ) ( 53,786,987 ) — ( 53,786,987 ) — Savings and interest-checking deposits ( 90,297,219 ) ( 90,297,219 ) — ( 90,297,219 ) — Time deposits ( 20,043,601 ) ( 19,931,959 ) — ( 19,931,959 ) — Short-term borrowings ( 6,730,663 ) ( 6,730,663 ) — ( 6,730,663 ) — Long-term borrowings ( 7,123,426 ) ( 6,811,799 ) — ( 6,811,799 ) — Accrued interest payable ( 401,752 ) ( 401,752 ) — ( 401,752 ) — Other financial instruments: Commitments to originate real estate $ ( 51,403 ) ( 51,403 ) — — ( 51,403 ) Commitments to sell real estate loans 65,337 65,337 — 65,337 — Other credit-related commitments ( 150,708 ) ( 150,708 ) — — ( 150,708 ) Interest rate swap agreements used 12,185 12,185 — 12,185 — Interest rate and foreign exchange contracts ( 1,095,612 ) ( 1,095,612 ) — ( 1,095,612 ) — 12. Fair value measurements, continued December 31, 2022 Carrying Estimated Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 1,517,244 1,517,244 1,371,688 145,556 — Interest-bearing deposits at banks 24,958,719 24,958,719 — 24,958,719 — Federal funds sold 3,000 3,000 — 3,000 — Trading account 117,847 117,847 117,847 — — Investment securities 25,210,871 24,056,322 145,289 23,860,445 50,588 Loans and leases: Commercial loans and leases 41,850,566 41,139,985 — — 41,139,985 Commercial real estate loans 45,364,571 43,214,646 — 130,652 43,083,994 Residential real estate loans 23,755,947 21,780,214 — 7,049,540 14,730,674 Consumer loans 20,593,079 20,093,523 — — 20,093,523 Allowance for credit losses ( 1,925,331 ) — — — — Loans and leases, net 129,638,832 126,228,368 — 7,180,192 119,048,176 Accrued interest receivable 646,250 646,250 — 646,250 — Financial liabilities: Noninterest-bearing deposits $ ( 65,501,860 ) ( 65,501,860 ) — ( 65,501,860 ) — Savings and interest-checking deposits ( 87,911,463 ) ( 87,911,463 ) — ( 87,911,463 ) — Time deposits ( 10,101,545 ) ( 10,143,110 ) — ( 10,143,110 ) — Short-term borrowings ( 3,554,951 ) ( 3,554,951 ) — ( 3,554,951 ) — Long-term borrowings ( 3,964,537 ) ( 3,926,489 ) — ( 3,926,489 ) — Accrued interest payable ( 81,356 ) ( 81,356 ) — ( 81,356 ) — Other financial instruments: Commitments to originate real estate $ ( 45,573 ) ( 45,573 ) — — ( 45,573 ) Commitments to sell real estate loans 54,424 54,424 — 54,424 — Other credit-related commitments ( 148,772 ) ( 148,772 ) — — ( 148,772 ) Interest rate swap agreements used ( 7,892 ) ( 7,892 ) — ( 7,892 ) — Interest rate and foreign exchange contracts ( 920,316 ) ( 920,316 ) — ( 920,316 ) — With the exception of marketable securities, certain off-balance sheet financial instruments and mortgage loans originated for sale, the Company’s financial instruments are not readily marketable and market prices do not exist. The Company, in attempting to comply with the provisions of GAAP that require disclosures of fair value of financial instruments, has not attempted to market its financial instruments to potential buyers, if any exist. Since negotiated prices in illiquid markets depend greatly upon the then present motivations of the buyer and seller, it is reasonable to assume that actual sales prices could vary widely from any estimate of fair value made without the benefit of negotiations. Additionally, changes in market interest rates can dramatically impact the value of financial instruments in a short period of time. The Company does not believe that the estimated information presented herein is representative of the earnings power or value of the Company. The preceding analysis, which is inherently limited in depicting fair value, also does not consider any value associated with existing customer relationships nor the ability of the Company to create value through loan origination, deposit gathering or fee generating activities. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable between financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Furthermore, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.

Commitments and contingencies

Commitments and contingencies	9 Months Ended
Commitments and contingencies	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	13. Commitments and contingencies In the normal course of business, various commitments and contingent liabilities are outstanding. The following table presents the Company's significant commitments. Certain of these commitments are not included in the Company's Consolidated Balance Sheet. September 30, December 31, 2023 2022 (In thousands) Commitments to extend credit Home equity lines of credit $ 8,167,368 $ 8,261,560 Commercial real estate loans to be sold 338,569 348,701 Other commercial real estate 6,224,142 5,776,116 Residential real estate loans to be sold 237,683 31,208 Other residential real estate 406,667 505,121 Commercial and other 33,670,583 32,625,840 Standby letters of credit 2,333,434 2,376,644 Commercial letters of credit 72,053 65,066 Financial guarantees and indemnification contracts 4,209,726 4,022,432 Commitments to sell real estate loans 948,190 533,458 Commitments to extend credit are agreements to lend to customers, generally having fixed expiration dates or other termination clauses that may require payment of a fee. In addition to the amounts in the preceding table, the Company had discretionary funding commitments to commercial customers of $ 12.5 billion and $ 11.7 billion at September 30, 2023 and December 31, 2022, respectively, that the Company had the unconditional right to cancel prior to funding. Standby and commercial letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. Standby letters of credit generally are contingent upon the failure of the customer to perform according to the terms of the underlying contract with the third party, whereas commercial letters of credit are issued to facilitate commerce and typically result in the commitment being funded when the underlying transaction is consummated between the customer and a third party. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management's assessment of the customer's creditworthiness. Financial guarantees and indemnification contracts are predominantly comprised of recourse obligations associated with sold loans and other guarantees and commitments. Included in financial guarantees and indemnification contracts are loan principal amounts sold with recourse in conjunction with the Company's involvement in the Fannie Mae Delegated Underwriting and Servicing program. The Company's maximum credit risk for recourse associated with loans sold under this program totaled approximately $ 4.0 billion and $ 3.9 billion at September 30, 2023 and December 31, 2022, respectively. There have been no material losses incurred as a result of those credit recourse arrangements. Since many loan commitments, standby letters of credit, and guarantees and indemnification contracts expire without being funded in whole or in part, the contract amounts are not necessarily indicative of future cash flows. The Company utilizes commitments to sell real estate loans to hedge exposure to changes in the fair value of real estate loans held for sale. Such commitments are accounted for as derivatives and along with commitments to originate real estate loans to be held for sale are generally recorded in the Consolidated Balance Sheet at estimated fair market value. 13. Commitments and contingencies, continued The Company is contractually obligated to repurchase previously sold residential real estate loans that do not ultimately meet investor sale criteria related to underwriting procedures or loan documentation. When required to do so, the Company may reimburse loan purchasers for losses incurred or may repurchase certain loans. The Company reduces residential mortgage banking revenues by an estimate for losses related to its obligations to loan purchasers. The amount of those charges is based on the volume of loans sold, the level of reimbursement requests received from loan purchasers and estimates of losses that may be associated with previously sold loans. At September 30, 2023, the Company assessed that its obligation to loan purchasers was not material to the Company’s consolidated financial position. M&T and its subsidiaries are subject in the normal course of business to various pending and threatened legal proceedings and matters in which claims for monetary damages are asserted. On an on-going basis management, after consultation with legal counsel, assesses the Company’s liabilities and contingencies in connection with such proceedings. For those matters where it is probable that the Company will incur losses and the amounts of the losses can be reasonably estimated, the Company records an expense and corresponding liability in its consolidated financial statements. To the extent pending or threatened litigation could result in exposure in excess of that liability, the amount of such excess is not currently estimable. Although not considered probable, the range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability, was between $ 0 and $ 25 million as of September 30, 2023. Although the Company does not believe that the outcome of pending legal matters will be material to the Company’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future. On May 11, 2023, the FDIC released a proposed rule that would impose a special assessment to recover the costs to the DIF resulting from the FDIC’s use, in March 2023, of the systemic risk exception to the least-cost resolution test under the Federal Deposit Insurance Act in connection with the receiverships of Silicon Valley Bank and Signature Bank. The FDIC stated that it currently estimates those assessed losses to total $ 15.8 billion and that the amount of the special assessments would be adjusted as the loss estimate changes. Under the proposed rule, the assessment base would be the estimated uninsured deposits that an IDI reported in its Federal Financial Institutions Examination Council Consolidated Reports of Condition and Income at December 31, 2022, excluding the first $ 5 billion in estimated uninsured deposits. For a holding company that has more than one IDI subsidiary, such as M&T, the $ 5 billion exclusion would be allocated among the company’s IDI subsidiaries in proportion to each IDI’s estimated uninsured deposits. The special assessments would be collected at an annual rate of approximately 12.5 basis points per year ( 3.13 basis points per quarter) over eight quarters in 2024 and 2025, with the first assessment period beginning January 1, 2024. Under the proposed rule, the estimated loss pursuant to the systemic risk determination would be periodically adjusted, and the FDIC would retain the ability to cease collection early, extend the special assessment collection period and impose a final shortfall special assessment on a one-time basis. M&T expects the special assessments, as currently contemplated, would be tax deductible. Although the proposal could be revised, the total of the assessments for the Company is estimated at $ 183 million and such amount is expected to be recorded as an expense in the quarter of enactment.

Segment information

Segment information	9 Months Ended
Segment information	Sep. 30, 2023
Segment Reporting [Abstract]
Segment information	14. Segment information Reportable segments have been determined based upon the Company's internal profitability reporting system, which is organized by strategic business unit. Certain strategic business units have been combined for segment information reporting purposes where the nature of the products and services, the type of customer and the distribution of those products and services are similar. The reportable segments are Business Banking, Commercial Banking, Commercial Real Estate, Discretionary Portfolio, Residential Mortgage Banking and Retail Banking. The financial information of the Company's segments was compiled utilizing the accounting policies described in note 23 of Notes to Financial Statements in the 2022 Annual Report. The management accounting policies and processes utilized in compiling segment financial information are highly subjective and, unlike financial accounting, are not based on authoritative guidance similar to GAAP. As a result, the financial information of the reported segments is not necessarily comparable with similar information reported by other financial institutions. Furthermore, changes in management structure or allocation methodologies and procedures may result in changes in reported segment financial data. As described in the 2022 Annual Report, certain lending relationships within the hospitality sector that had previously received oversight within the Commercial Banking segment were realigned to the Commercial Real Estate segment and certain expenses were reallocated from the All Other segment to various reportable segments in the fourth quarter of 2022. Since acquisition in 2022, the Company also realigned certain operations associated with People's United requiring reclassifications of certain revenues and expenses among the reportable segments. As a result, financial information for the three and nine months ended September 30, 2022 has been reclassified to provide segment information on a comparable basis, as noted in the accompanying tables. Three Months Ended September 30, 2022 Total Revenues as Previously Reported Impact of Changes Total Revenues as Reclassified Net Income (Loss) as Previously Reported Impact of Changes Net Income (Loss) as Reclassified (In thousands) Business Banking $ 241,629 — $ 241,629 $ 94,094 ( 1,476 ) $ 92,618 Commercial Banking 510,549 ( 1,173 ) 509,376 214,063 ( 2,838 ) 211,225 Commercial Real Estate 234,479 12,635 247,114 94,937 15,097 110,034 Discretionary Portfolio 36,622 ( 24,981 ) 11,641 11,813 ( 18,074 ) ( 6,261 ) Residential Mortgage Banking 95,091 — 95,091 ( 3,283 ) 1,173 ( 2,110 ) Retail Banking 650,229 ( 2 ) 650,227 181,639 1,155 182,794 All Other 473,171 13,521 486,692 53,333 4,963 58,296 Total $ 2,241,770 — $ 2,241,770 $ 646,596 — $ 646,596 Nine Months Ended September 30, 2022 Total Revenues as Previously Reported Impact of Changes Total Revenues as Reclassified Net Income (Loss) as Previously Reported Impact of Changes Net Income (Loss) as Reclassified (In thousands) Business Banking $ 586,605 — $ 586,605 $ 205,741 ( 6,008 ) $ 199,733 Commercial Banking 1,239,300 ( 2,550 ) 1,236,750 521,749 ( 20,254 ) 501,495 Commercial Real Estate 676,176 29,707 705,883 314,284 24,941 339,225 Discretionary Portfolio 190,761 ( 39,866 ) 150,895 103,283 ( 30,448 ) 72,835 Residential Mortgage Banking 346,409 — 346,409 35,028 ( 2,095 ) 32,933 Retail Banking 1,523,992 — 1,523,992 379,688 ( 13,243 ) 366,445 All Other 1,106,405 12,709 1,119,114 ( 333,481 ) 47,107 ( 286,374 ) Total $ 5,669,648 — $ 5,669,648 $ 1,226,292 — $ 1,226,292 14. Segment information, continued Information about the Company's segments follows: Three Months Ended September 30 2023 2022 Total Inter- Net Total Inter- Net (In thousands) Business Banking $ 291,839 $ 980 $ 117,290 $ 241,629 $ 663 $ 92,618 Commercial Banking 453,326 8,224 167,714 509,376 802 211,225 Commercial Real Estate 231,303 188 72,442 247,114 249 110,034 Discretionary Portfolio ( 20,672 ) ( 14,110 ) ( 21,586 ) 11,641 ( 23,044 ) ( 6,261 ) Residential Mortgage Banking 100,444 19,373 ( 14,422 ) 95,091 35,647 ( 2,110 ) Retail Banking 876,002 ( 35 ) 342,700 650,227 ( 5 ) 182,794 All Other 402,727 ( 14,620 ) 25,803 486,692 ( 14,312 ) 58,296 Total $ 2,334,969 $ — $ 689,941 $ 2,241,770 $ — $ 646,596 Nine Months Ended September 30 2023 2022 Total Inter- Net Total Inter- Net (In thousands) Business Banking $ 842,571 $ 2,904 $ 346,704 $ 586,605 $ 2,060 $ 199,733 Commercial Banking 1,420,971 27,742 553,255 1,236,750 2,605 501,495 Commercial Real Estate 674,276 745 192,539 705,883 687 339,225 Discretionary Portfolio ( 78,005 ) ( 44,124 ) ( 93,678 ) 150,895 ( 74,952 ) 72,835 Residential Mortgage Banking 280,654 60,599 ( 41,676 ) 346,409 110,986 32,933 Retail Banking 2,572,410 ( 113 ) 995,927 1,523,992 ( 12 ) 366,445 All Other 1,629,789 ( 47,753 ) 305,528 1,119,114 ( 41,374 ) ( 286,374 ) Total $ 7,342,666 $ — $ 2,258,599 $ 5,669,648 $ — $ 1,226,292 Average Total Assets Nine Months Ended September 30 Year Ended 31 2023 2022 2022 (In millions) Business Banking $ 7,968 $ 7,515 $ 7,597 Commercial Banking (b) 49,373 39,293 40,930 Commercial Real Estate (b) 31,878 29,982 30,599 Discretionary Portfolio 50,900 40,987 42,657 Residential Mortgage Banking 2,746 4,370 3,986 Retail Banking 21,261 20,063 20,312 All Other 40,140 45,185 44,171 Total $ 204,266 $ 187,395 $ 190,252 (a) Total revenues are comprised of net interest income and other income. Net interest income is the difference between taxable-equivalent interest earned on assets and interest paid on liabilities owed by a segment and a funding charge (credit) based on the Company's internal funds transfer and allocation methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated $ 14.3 million and $ 11.8 million for the three-month periods ended September 30, 2023 and 2022 , respectively, and $ 41.7 million and $ 25.8 million for the nine-month periods ended September 30, 2023 and 2022 and is eliminated in "All Other" total revenues. Intersegment revenues are included in total revenues of the reportable segments. The elimination of intersegment revenues is included in the determination of "All Other" total revenues. (b) For the nine months ended September 30, 2022 , average total assets totaling approximately $ 1.17 billion were reclassified to the Commercial Real Estate segment from the Commercial Banking segment as a result of the realignment of certain lending relationships within the hospitality sector.

Relationship with Bayview Lendi

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.	9 Months Ended
	Sep. 30, 2023
Text Block [Abstract]
Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P.	15. Relationship with BLG and Bayview Financial M&T holds a 20 % minority interest in BLG, a privately-held commercial mortgage company. That investment had no remaining carrying value at September 30, 2023 as a result of cumulative losses recognized and cash distributions received in prior years. Cash distributions now received from BLG are recognized as income by M&T and included in other revenues from operations. That income totaled $ 20 million and $ 30 million for the nine-month periods ended September 30, 2023 and 2022 , respectively. There were no cash distributions during the three-month periods ended September 30, 2023 and 2022. Bayview Financial, a privately-held specialty finance company, is BLG's majority investor. In addition to their common investment in BLG, the Company and Bayview Financial conduct other business activities with each other. The Company has obtained loan servicing rights for mortgage loans from BLG and Bayview Financial having outstanding principal balances of $ 1.2 billion and $ 1.4 billion at September 30, 2023 and December 31, 2022 , respectively. Revenues from those servicing rights were $ 1 million and $ 3 million in the three-month periods ended September 30, 2023 and 2022 , respectively, and $ 5 million and $ 7 million for the nine-month periods ended September 30, 2023 and 2022 , respectively. The Company sub-services residential mortgage loans for Bayview Financial having outstanding principal balances of $ 114.6 billion and $ 96.0 billion at September 30, 2023 and December 31, 2022 , respectively. Revenues earned for sub-servicing loans for Bayview Financial were $ 30 million and $ 33 million for the three-month periods ended September 30, 2023 and 2022 , respectively, and $ 94 million and $ 119 million in the nine-month periods ended September 30, 2023 and 2022 , respectively. In addition, the Company held $ 44 million and $ 50 million of mortgage-backed securities in its held-to-maturity portfolio at September 30, 2023 and December 31, 2022, respectively, that were securitized by Bayview Financial. At September 30, 2023 , the Company held $ 765 million of Bayview Financial's $ 3.1 billion syndicated loan facility.

Recent accounting developments

Recent accounting developments	9 Months Ended
Recent accounting developments	Sep. 30, 2023
Accounting Changes and Error Corrections [Abstract]
Recent accounting developments	16. Recent accounting developments The following table provides a description of accounting standards that were adopted by the Company in 2023 as well as standards that are not effective that could have an impact to the Company’s consolidated financial statements upon adoption. Standard Description Required date of adoption Effect on consolidated financial statements Standards Adopted in 2023 Accounting for Contract Assets and Contract Liabilities from Contracts with Customers in a Business Combination The amendments require that an entity (acquirer) recognize and measure contract assets and contract liabilities acquired in a business combination in accordance with specified revenue recognition guidance. At the acquisition date, an acquirer should account for the related revenue contracts as if it had originated the contracts and may assess how the acquiree applied the revenue guidance to determine what to record for such contracts. The guidance is generally expected to result in an acquirer recognizing and measuring the acquired contract assets and contract liabilities consistent with how they were recognized and measured in the acquiree’s financial statements. January 1, 2023 The Company adopted the amended guidance effective January 1, 2023 using a prospective transition method and the guidance will be applied, as applicable, to future acquisitions. The Company does not expect the guidance will have a material impact on its consolidated financial statements. Fair Value Hedging of Multiple Hedge Layers under Portfolio Layer Method The amendments allow multiple hedged layers to be designated for a single closed portfolio of financial assets or one or more beneficial interests secured by a portfolio of financial instruments. If multiple hedged layers are designated, the amendments require an analysis to be performed to support the expectation that the aggregate amount of the hedged layers is anticipated to be outstanding for the designated hedge periods. Only closed portfolios may be hedged under the portfolio layer method (that is, no assets can be added to the closed portfolio once established), however designating new hedging relationships and dedesignating existing hedging relationships associated with the closed portfolio any time after the closed portfolio is established is permitted. January 1, 2023 At January 1, 2023 the Company did not have any designated hedging relationships under the portfolio layer method and, therefore, the adoption had no impact on its consolidated financial statements. Accounting for Troubled Debt Restructurings (TDRs) and Expansion of Vintage Disclosures Applicable to Credit Losses The amendments (1) eliminate the accounting guidance for TDRs and require enhanced disclosure for certain loan refinancings by creditors when a borrower is experiencing financial difficulty and (2) require disclosure of current-period gross write-offs by year of origination for financing receivables and net investments in leases within credit loss disclosures. January 1, 2023 The Company adopted the amended guidance effective January 1, 2023 using a prospective transition method and will no longer be required to identify TDRs and apply specialized accounting to such loans. The Company has complied with the modified disclosure requirements in note 4 of Notes to Financial Statements herein. 16. Recent accounting developments, continued Standard Description Required date of adoption Effect on consolidated financial statements Standards Not Yet Adopted as of September 30, 2023 Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions The amendments clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. The amendments also clarify that an entity cannot, as a separate unit of account, recognize and measure a contractual sale restriction. In addition, the amendments require the following disclosures for equity securities subject to contractual sale restrictions: 1. The fair value of equity securities subject to contractual sale restrictions reflected in the balance sheet; 2. The nature and remaining duration of the restriction(s); and 3. The circumstances that could cause a lapse in the restriction(s). January 1, 2024 Early adoption permitted The amendments should be applied prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. The Company does not expect the guidance will have a material impact on its consolidated financial statements. Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method The amendments permit an election to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the income tax credits and other income tax benefits received and the net amortization and income tax credits and other income tax benefits are recognized in the income statement as a component of income tax expense (benefit). All of the following conditions must be met to qualify for the proportional amortization method: 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. To apply the proportional amortization method, an accounting policy election must be made on a tax-credit-program-by-tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. When applying the proportional amortization method to qualifying tax equity investments the receipt of the investment tax credits must be accounted for using the flow-through method as prescribed by GAAP, even if the deferral method is applied to other investment tax credits received. In addition, all tax equity investments accounted for using the proportional amortization method must use the delayed equity contribution guidance (which requires that a liability be recognized for delayed equity contributions that are unconditional and legally binding or for equity contributions that are contingent upon a future event when that contingent event becomes probable). January 1, 2024 Early adoption permitted The amendments should be applied on either a modified retrospective or a retrospective basis. Under a modified retrospective transition, all investments for which income tax credits or other income tax benefits are still expected to be received must be evaluated as of the beginning of the period of adoption. The assessment of whether the investment qualifies for the proportional amortization method is performed as of the date the investment was entered into. A cumulative-effect adjustment reflecting the difference between the previous method used to account for the tax equity investment and the application of the proportional amortization method since the investment was entered into is recognized in the opening balance of retained earnings as of the beginning of the period of adoption. Under a retrospective transition, all investments for which income tax credits or other income tax benefits are still expected to be received must be evaluated as of the beginning of the earliest period presented. The assessment of whether the investment qualifies for the proportional amortization method is performed as of the date the investment was entered into. A cumulative-effect adjustment reflecting the difference between the previous method used to account for the tax equity investment and the application of the proportional amortization method since the investment was entered into is recognized in the opening balance of retained earnings as of the beginning of the earliest period presented. The Company does not expect the guidance will have a material impact on its consolidated financial statements. 16. Recent accounting developments, continued Business Combinations Joint Venture Formations The amendments require that a joint venture apply the following key adaptations from the business combinations guidance upon formation: 1. A joint venture is the formation of a new entity without an accounting acquirer. The formation of a joint venture is the creation of a new reporting entity, and none of the assets and/or businesses contributed to the joint venture are viewed as having survived the combination as an independent entity—that is, an accounting acquirer will not be identified. 2. A joint venture measures its identifiable net assets and goodwill, if any, at the formation date. The joint venture formation date is the date on which an entity initially meets the definition of a joint venture. 3. Initial measurement of a joint venture’s total net assets is equal to the fair value of 100 percent of the joint venture’s equity. The amendments require that a joint venture measure its total net assets upon formation as the fair value of the joint venture as a whole. The fair value of the joint venture as a whole equals the fair value of 100 percent of a joint venture’s equity immediately following formation (including any noncontrolling interest in the net assets recognized by the joint venture). 4. A joint venture provides relevant disclosures. The amendments require disclosures to help a user of a joint venture’s financial statements understand the nature and financial effect of the joint venture formation in the period in which the formation date occurs. Joint venture disclosure requirements upon formation are different from the requirements for business combinations. January 1, 2025 Early adoption permitted The amendments should be applied on a prospective basis for all joint venture formations with a formation date on or after January 1, 2025. A joint venture that was formed before January 1, 2025 may elect to apply the amendments retrospectively if sufficient information is available. The Company does not expect the guidance will have a material impact on its consolidated financial statements.

Significant accounting polici_2

Significant accounting policies (Policies)	9 Months Ended
Significant accounting policies (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Accounting	The consolidated interim financial statements of the Company were compiled in accordance with GAAP using the accounting policies set forth in note 1 of Notes to Financial Statements included in the 2022 Annual Report, except as disclosed in note 16 of Notes to Financial Statements herein. The financial statements contain all adjustments which are, in the opinion of management, necessary for a fair statement of the Company's financial position, results of operations and cash flows for the interim periods presented.

Acquisition and divestiture (Ta

Acquisition and divestiture (Tables)	9 Months Ended
Acquisition and divestiture (Tables)	Sep. 30, 2023
Business Combinations [Abstract]
Summary of Identifiable Assets Acquired, Liabilities Assumed and Preferred Stock Exchanged as of Acquisition	The consideration paid for People’s United common equity and the amounts of identifiable assets acquired, liabilities assumed and preferred stock converted as of the acquisition date follows: (In thousands) Consideration: Common stock issued ( 50,325,004 shares) $ 8,286,515 Common stock awards converted 104,810 Cash 1,824 Total consideration 8,393,149 Net assets acquired: Identifiable assets Cash and due from banks 395,747 Interest-bearing deposits at banks 9,193,346 Investment securities 11,574,689 Loans and leases 35,840,648 Core deposit and other intangible assets 261,000 Other assets 2,979,388 Total identifiable assets acquired 60,244,818 Liabilities and preferred stock Deposits 52,967,915 Borrowings 1,389,012 Other liabilities 1,142,387 Total liabilities assumed 55,499,314 Preferred stock 260,600 Total liabilities and preferred stock 55,759,914 Net assets acquired 4,484,904 Goodwill $ 3,908,245
Summary of Unpaid Principal Balance to Fair Value of Loans and Leases by Portfolio Segment	The following table reconciles the unpaid principal balance to the fair value of loans and leases at April 1, 2022: PCD Non-PCD (In thousands) Unpaid principal balance $ 3,410,506 (a) $ 32,896,454 Allowance for credit losses at acquisition ( 99,000 ) (a) — Other discount ( 106,814 ) ( 260,498 ) (b) Fair value $ 3,204,692 $ 32,635,956 (a) The unpaid principal balance and allowance for credit losses at acquisition is net of charge-offs of $ 33 million recognized on the PCD loans . (b) Includes approximately $ 242 million of principal balances not expected to be collected.
Summary of Acquisition, Pro Forma Information	The following table presents certain pro forma information as if People’s United had been acquired on January 1, 2021. Pro forma Nine months ended September 30, 2022 (In thousands) Total revenues (a) $ 6,134,400 Net income 1,399,913 (a) Represents the total of net interest income and other income.

Investment securities (Tables)

Investment securities (Tables)	9 Months Ended
Investment securities (Tables)	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Investment Securities	The amortized cost and estimated fair value of investment securities were as follows: Amortized Gross Gross Estimated (In thousands) September 30, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,935,658 $ — $ 200,551 $ 7,735,107 Mortgage-backed securities: Government issued or guaranteed: Commercial 544,263 — 18,794 525,469 Residential 2,382,810 8 214,531 2,168,287 Other debt securities 176,235 146 12,835 163,546 11,038,966 154 446,711 10,592,409 Investment securities held to maturity: U.S. Treasury and federal agencies 1,001,991 — 48,706 953,285 Obligations of states and political subdivisions 2,511,784 — 219,149 2,292,635 Mortgage-backed securities: Government issued or guaranteed: Commercial 2,031,532 — 233,055 1,798,477 Residential 9,979,882 — 1,306,934 8,672,948 Privately issued 44,319 9,041 7,374 45,986 Other debt securities 1,612 — — 1,612 15,571,120 9,041 1,815,218 13,764,943 Total debt securities $ 26,610,086 $ 9,195 $ 2,261,929 $ 24,357,352 Equity and other securities: Readily marketable equity — at fair value $ 260,688 $ 2,425 $ 3,897 $ 259,216 Other — at cost 913,358 — — 913,358 Total equity and other securities $ 1,174,046 $ 2,425 $ 3,897 $ 1,172,574 December 31, 2022 Investment securities available for sale: U.S. Treasury and federal agencies $ 7,913,932 $ 200 $ 243,172 $ 7,670,960 Mortgage-backed securities: Government issued or guaranteed: Commercial 594,779 — 20,480 574,299 Residential 2,501,334 65 171,281 2,330,118 Other debt securities 183,107 250 9,773 173,584 11,193,152 515 444,706 10,748,961 Investment securities held to maturity: U.S. Treasury and federal agencies 1,054,035 — 45,747 1,008,288 Obligations of states and political subdivisions 2,577,078 4 116,512 2,460,570 Mortgage-backed securities: Government issued or guaranteed: Commercial 912,431 — 103,528 808,903 Residential 8,934,918 1,451 891,063 8,045,306 Privately issued 49,742 8,833 7,987 50,588 Other debt securities 1,765 — — 1,765 13,529,969 10,288 1,164,837 12,375,420 Total debt securities $ 24,723,121 $ 10,803 $ 1,609,543 $ 23,124,381 Equity and other securities: Readily marketable equity — at fair value $ 153,283 $ 2,120 $ 3,945 $ 151,458 Other — at cost 780,483 — — 780,483 Total equity and other securities $ 933,766 $ 2,120 $ 3,945 $ 931,941
Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity	At September 30, 2023, the amortized cost and estimated fair value of debt securities by contractual maturity were as follows: Amortized Estimated (In thousands) Debt securities available for sale: Due in one year or less $ 4,619,339 $ 4,544,581 Due after one year through five years 3,437,580 3,306,540 Due after five years through ten years 24,974 22,400 Due after ten years 30,000 25,132 8,111,893 7,898,653 Mortgage-backed securities available for sale 2,927,073 2,693,756 $ 11,038,966 $ 10,592,409 Debt securities held to maturity: Due in one year or less $ 14,164 $ 13,967 Due after one year through five years 1,151,126 1,097,310 Due after five years through ten years 1,306,208 1,223,790 Due after ten years 1,043,889 912,465 3,515,387 3,247,532 Mortgage-backed securities held to maturity 12,055,733 10,517,411 $ 15,571,120 $ 13,764,943
Investment Securities in Continuous Unrealized Loss Position	A summary of investment securities that as of September 30, 2023 and December 31, 2022 had been in a continuous unrealized loss position for less than twelve months and those that had been in a continuous unrealized loss position for twelve months or longer follows: Less Than 12 Months 12 Months or More Fair Unrealized Fair Unrealized (In thousands) September 30, 2023 Investment securities available for sale: U.S. Treasury and federal agencies $ 226,045 $ 3,741 $ 7,509,062 $ 196,810 Mortgage-backed securities: Government issued or guaranteed: Commercial 81,949 5,146 443,520 13,648 Residential 240,610 13,246 1,926,504 201,285 Other debt securities 6,553 202 152,192 12,633 555,157 22,335 10,031,278 424,376 Investment securities held to maturity: U.S. Treasury and federal agencies 48,825 1,193 904,460 47,513 Obligations of states and political subdivisions 235,273 15,423 2,055,317 203,726 Mortgage-backed securities: Government issued or guaranteed: Commercial 1,015,480 97,998 782,997 135,057 Residential 2,570,788 146,021 6,102,160 1,160,913 Privately issued 1,927 82 32,081 7,292 3,872,293 260,717 9,877,015 1,554,501 Total $ 4,427,450 $ 283,052 $ 19,908,293 $ 1,978,877 December 31, 2022 Investment securities available for sale: U.S. Treasury and federal agencies $ 6,706,413 $ 183,760 $ 841,945 $ 59,412 Mortgage-backed securities: Government issued or guaranteed: Commercial 574,299 20,480 — — Residential 2,295,873 169,489 28,305 1,792 Other debt securities 93,458 3,604 73,280 6,169 9,670,043 377,333 943,530 67,373 Investment securities held to maturity: U.S. Treasury and federal agencies 1,008,288 45,747 — — Obligations of states and political subdivisions 2,449,420 116,512 — — Mortgage-backed securities: Government issued or guaranteed: Commercial 808,903 103,528 — — Residential 6,292,462 619,403 1,319,300 271,660 Privately issued — — 35,661 7,987 10,559,073 885,190 1,354,961 279,647 Total $ 20,229,116 $ 1,262,523 $ 2,298,491 $ 347,020

Loans and leases and the allo_2

Loans and leases and the allowance for credit losses (Tables)	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Summary of Current, Past Due and Nonaccrual Loans	A summary of current, past due and nonaccrual loans as of September 30, 2023 and December 31, 2022 follows: Current 30-89 Days Accruing Past Nonaccrual Total (In thousands) September 30, 2023 Commercial, financial, leasing, etc. $ 44,298,562 $ 252,987 $ 21,064 $ 485,420 $ 45,058,033 Real estate: Commercial 34,018,257 424,005 65,426 1,236,087 35,743,775 Residential builder and developer 1,090,355 6,786 — 3,353 1,100,494 Other commercial construction 6,371,793 221,532 — 136,004 6,729,329 Residential 21,342,546 645,696 261,290 240,753 22,490,285 Residential — limited documentation 865,988 29,747 — 62,250 957,985 Consumer: Home equity lines and loans 4,578,381 36,014 — 78,316 4,692,711 Recreational finance 9,448,458 67,149 — 30,524 9,546,131 Automobile 3,855,578 46,257 — 15,959 3,917,794 Other 2,040,303 18,324 6,249 53,272 2,118,148 Total $ 127,910,221 $ 1,748,497 $ 354,029 $ 2,341,938 $ 132,354,685 December 31, 2022 Commercial, financial, leasing, etc. $ 40,982,398 $ 448,462 $ 72,502 $ 347,204 $ 41,850,566 Real estate: Commercial 34,972,627 311,188 67,696 1,396,662 36,748,173 Residential builder and developer 1,304,798 8,703 — 1,229 1,314,730 Other commercial construction 6,936,661 239,521 549 124,937 7,301,668 Residential 21,491,506 595,897 345,402 272,090 22,704,895 Residential — limited documentation 950,782 22,456 — 77,814 1,051,052 Consumer: Home equity lines and loans 4,891,311 30,787 — 84,788 5,006,886 Recreational finance 8,974,171 54,593 — 44,630 9,073,394 Automobile 4,393,206 44,486 — 39,584 4,477,276 Other 1,958,196 22,961 4,869 49,497 2,035,523 Total $ 126,855,656 $ 1,779,054 $ 491,018 $ 2,438,435 $ 131,564,163
Summary of Loan grades applied various classes of Commercial and Real Estate Loans	The following table summarizes the loan grades applied at September 30, 2023 to the various classes of the Company’s commercial loans and commercial real estate loans and gross charge-offs for those types of loans for the three-month and nine-month periods ended September 30, 2023 by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2023 2022 2021 2020 2019 Prior Loans Loans Total (In thousands) Commercial, financial, leasing, etc.: Loan grades: Pass $ 5,789,909 7,017,863 4,114,909 1,510,693 1,238,701 1,995,635 20,869,512 56,263 $ 42,593,485 Criticized accrual 109,004 264,016 180,450 113,930 99,434 307,309 878,730 26,255 1,979,128 Criticized nonaccrual 12,337 57,857 42,081 33,338 21,447 68,028 240,285 10,047 485,420 Total commercial, $ 5,911,250 7,339,736 4,337,440 1,657,961 1,359,582 2,370,972 21,988,527 92,565 $ 45,058,033 Gross charge-offs three months ended September 30, 2023 $ 2,124 7,929 2,998 1,766 2,539 3,300 6,188 — $ 26,844 Gross charge-offs nine months ended September 30, 2023 $ 2,959 18,887 11,108 8,518 7,056 11,615 6,961 — $ 67,104 Real estate: Commercial: Loan grades: Pass $ 2,553,454 3,578,095 2,989,307 2,978,906 4,446,005 12,208,078 710,648 — $ 29,464,493 Criticized accrual 725 630,132 478,637 494,243 905,654 2,510,960 22,844 — 5,043,195 Criticized nonaccrual 245 54,904 14,255 159,956 151,052 831,527 24,148 — 1,236,087 Total commercial real $ 2,554,424 4,263,131 3,482,199 3,633,105 5,502,711 15,550,565 757,640 — $ 35,743,775 Gross charge-offs three months ended September 30, 2023 $ — — — — — 48,093 — — $ 48,093 Gross charge-offs nine months ended September 30, 2023 $ — — — 424 77,906 100,004 — — $ 178,334 Residential builder and developer: Loan grades: Pass $ 433,338 337,680 67,233 6,818 2,050 13,503 133,839 — $ 994,461 Criticized accrual 310 11,867 25,379 — 64,125 336 663 — 102,680 Criticized nonaccrual — — 2,835 — 518 — — — 3,353 Total residential builder $ 433,648 349,547 95,447 6,818 66,693 13,839 134,502 — $ 1,100,494 Gross charge-offs three months ended September 30, 2023 $ — 245 — — — — — — $ 245 Gross charge-offs nine months ended September 30, 2023 $ — 245 — — — 55 1,678 — $ 1,978 Other commercial construction: Loan grades: Pass $ 636,314 1,481,975 1,023,831 676,613 465,423 204,511 20,171 — $ 4,508,838 Criticized accrual 7,180 130,644 184,379 531,138 837,446 393,700 — — 2,084,487 Criticized nonaccrual — — 10,018 46,626 50,165 26,237 2,958 — 136,004 Total other commercial $ 643,494 1,612,619 1,218,228 1,254,377 1,353,034 624,448 23,129 — $ 6,729,329 Gross charge-offs three months ended September 30, 2023 $ — — — — 3,236 — — — $ 3,236 Gross charge-offs nine months ended September 30, 2023 $ — — — — 3,236 — — — $ 3,236 The following table summarizes the loan grades applied at December 31, 2022 to the various classes of the Company’s commercial loans and commercial real estate loans by origination year. Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2022 2021 2020 2019 2018 Prior Loans Loans Total (In thousands) Commercial, financial, leasing, etc.: Loan grades: Pass $ 8,575,130 4,952,758 2,024,603 1,796,047 817,569 1,970,947 19,444,247 40,471 $ 39,621,772 Criticized accrual 247,626 222,861 190,368 116,881 71,485 246,846 768,497 17,026 1,881,590 Criticized nonaccrual 18,379 52,067 37,608 36,241 35,689 59,146 100,972 7,102 347,204 Total commercial, $ 8,841,135 5,227,686 2,252,579 1,949,169 924,743 2,276,939 20,313,716 64,599 $ 41,850,566 Real estate: Commercial: Loan grades: Pass $ 4,136,890 3,379,900 3,388,590 4,557,065 3,293,380 10,905,956 869,981 — $ 30,531,762 Criticized accrual 324,652 463,484 467,557 688,239 937,421 1,890,297 48,099 — 4,819,749 Criticized nonaccrual 11,541 22,459 183,986 297,106 170,382 688,079 23,109 — 1,396,662 Total commercial real $ 4,473,083 3,865,843 4,040,133 5,542,410 4,401,183 13,484,332 941,189 — $ 36,748,173 Residential builder and developer: Loan grades: Pass $ 680,705 230,079 11,280 22,111 12,812 9,865 150,404 — $ 1,117,256 Criticized accrual 2,969 28,472 9,952 108,968 15,069 — 30,815 — 196,245 Criticized nonaccrual 57 654 — 518 — — — — 1,229 Total residential builder $ 683,731 259,205 21,232 131,597 27,881 9,865 181,219 — $ 1,314,730 Other commercial construction: Loan grades: Pass $ 1,032,774 1,080,141 1,225,845 1,185,685 366,686 297,355 15,575 — $ 5,204,061 Criticized accrual 37,893 145,199 320,463 1,025,371 299,350 144,394 — — 1,972,670 Criticized nonaccrual — 9,992 44,037 35,841 10,542 22,099 2,426 — 124,937 Total other commercial $ 1,070,667 1,235,332 1,590,345 2,246,897 676,578 463,848 18,001 — $ 7,301,668
Summary of loans in Accrual and Nonaccrual Status	A summary of loans in accrual and nonaccrual status at September 30, 2023 for the various classes of the Company’s residential real estate loans and consumer loans and gross charge-offs for those types of loans for the three-month and nine-month periods ended September 30, 2023 by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2023 2022 2021 2020 2019 Prior Loans Loans Total (In thousands) Residential: Current $ 1,349,605 4,827,335 3,817,652 2,605,414 1,240,538 7,419,338 82,664 — $ 21,342,546 30-89 days past due 8,385 87,178 68,811 41,367 22,082 416,816 1,057 — 645,696 Accruing loans past due 913 27,348 19,355 13,736 13,169 186,769 — — 261,290 Nonaccrual 971 14,353 13,730 3,500 8,529 192,207 7,463 — 240,753 Total residential $ 1,359,874 4,956,214 3,919,548 2,664,017 1,284,318 8,215,130 91,184 — $ 22,490,285 Gross charge-offs three months ended September 30, 2023 $ — 31 — — — 248 — — $ 279 Gross charge-offs nine months ended September 30, 2023 $ — 164 192 21 139 2,173 — — $ 2,689 Residential - limited documentation: Current $ — — — — — 865,988 — — $ 865,988 30-89 days past due — — — — — 29,747 — — 29,747 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 62,250 — — 62,250 Total residential - limited $ — — — — — 957,985 — — $ 957,985 Gross charge-offs three months ended September 30, 2023 $ — — — — — 1,053 — — $ 1,053 Gross charge-offs nine months ended September 30, 2023 $ — — — — — 1,416 — — $ 1,416 Consumer: Home equity lines and loans: Current $ 75 27 1,918 1,874 13,594 103,236 3,032,468 1,425,189 $ 4,578,381 30-89 days past due — — — 144 232 2,104 — 33,534 36,014 Accruing loans past due — — — — — — — — — Nonaccrual — — 19 — 27 6,091 1,158 71,021 78,316 Total home equity lines and loans $ 75 27 1,937 2,018 13,853 111,431 3,033,626 1,529,744 $ 4,692,711 Gross charge-offs three months ended September 30, 2023 $ — — — — — — — 1,522 $ 1,522 Gross charge-offs nine months ended September 30, 2023 $ — — — — — 84 1,298 3,339 $ 4,721 Recreational finance: Current $ 1,824,498 2,438,925 1,944,826 1,344,923 820,557 1,074,729 — — $ 9,448,458 30-89 days past due 5,564 11,669 15,168 12,145 7,973 14,630 — — 67,149 Accruing loans past due — — — — — — — — — Nonaccrual 1,138 3,935 6,338 5,477 4,013 9,623 — — 30,524 Total recreational finance $ 1,831,200 2,454,529 1,966,332 1,362,545 832,543 1,098,982 — — $ 9,546,131 Gross charge-offs three months ended September 30, 2023 $ 1,261 3,415 3,475 2,377 1,872 3,673 — — $ 16,073 Gross charge-offs nine months ended September 30, 2023 $ 2,134 8,565 9,502 8,108 6,035 11,030 — — $ 45,374 Automobile: Current $ 653,170 1,192,810 1,164,074 489,259 236,991 119,274 — — $ 3,855,578 30-89 days past due 3,019 12,198 13,492 6,866 5,582 5,100 — — 46,257 Accruing loans past due — — — — — — — — — Nonaccrual 1,148 2,679 4,632 2,525 2,217 2,758 — — 15,959 Total automobile $ 657,337 1,207,687 1,182,198 498,650 244,790 127,132 — — $ 3,917,794 Gross charge-offs three months ended September 30, 2023 $ 476 1,584 1,288 625 436 579 — — $ 4,988 Gross charge-offs nine months ended September 30, 2023 $ 557 4,403 5,272 2,502 1,919 1,977 — — $ 16,630 Other: Current $ 209,451 200,204 128,475 38,232 19,931 19,668 1,421,161 3,181 $ 2,040,303 30-89 days past due 2,592 2,055 1,546 314 185 383 10,337 912 18,324 Accruing loans past due — — — — — 208 6,041 — 6,249 Nonaccrual 1,805 852 430 119 149 305 49,408 204 53,272 Total other $ 213,848 203,111 130,451 38,665 20,265 20,564 1,486,947 4,297 $ 2,118,148 Gross charge-offs three months ended September 30, 2023 $ 5,716 2,200 1,222 323 263 348 9,723 — $ 19,795 Gross charge-offs nine months ended September 30, 2023 $ 11,829 14,060 6,218 2,927 3,178 9,682 9,915 — $ 57,809 Total loans and leases at $ 13,605,150 22,386,601 16,333,780 11,118,156 10,677,789 29,091,048 27,515,555 1,626,606 $ 132,354,685 Total gross charge-offs for $ 9,577 15,404 8,983 5,091 8,346 57,294 15,911 1,522 $ 122,128 Total gross charge-offs for $ 17,479 46,324 32,292 22,500 99,469 138,036 19,852 3,339 $ 379,291 A summary of loans in accrual and nonaccrual status at December 31, 2022 for the various classes of the Company’s residential real estate loans and consumer loans by origination year follows: Term Loans by Origination Year Revolving Revolving Loans Converted to Term 2022 2021 2020 2019 2018 Prior Loans Loans Total (In thousands) Residential: Current $ 5,071,379 4,001,652 2,717,371 1,392,866 753,908 7,523,890 30,440 — $ 21,491,506 30-89 days past due 59,477 51,308 40,337 21,849 23,126 399,301 499 — 595,897 Accruing loans past due 12,012 39,934 20,067 14,050 14,007 245,332 — — 345,402 Nonaccrual 5,686 10,865 2,583 9,860 4,650 231,093 7,353 — 272,090 Total residential $ 5,148,554 4,103,759 2,780,358 1,438,625 795,691 8,399,616 38,292 — $ 22,704,895 Residential - limited documentation: Current $ — — — — — 950,782 — — $ 950,782 30-89 days past due — — — — — 22,456 — — 22,456 Accruing loans past due — — — — — — — — — Nonaccrual — — — — — 77,814 — — 77,814 Total residential - limited $ — — — — — 1,051,052 — — $ 1,051,052 Consumer: Home equity lines and Current $ 930 2,109 2,441 15,361 23,321 97,282 3,262,533 1,487,334 $ 4,891,311 30-89 days past due — — — 171 126 2,030 — 28,460 30,787 Accruing loans past due — — — — — — — — — Nonaccrual — 15 — 536 334 6,458 2,799 74,646 84,788 Total home equity lines and $ 930 2,124 2,441 16,068 23,781 105,770 3,265,332 1,590,440 $ 5,006,886 Recreational finance: Current $ 2,842,091 2,280,627 1,587,629 963,907 486,964 812,953 — — $ 8,974,171 30-89 days past due 8,648 9,525 12,412 8,387 5,202 10,419 — — 54,593 Accruing loans past due — — — — — — — — — Nonaccrual 3,533 7,440 9,427 7,625 5,344 11,261 — — 44,630 Total recreational finance $ 2,854,272 2,297,592 1,609,468 979,919 497,510 834,633 — — $ 9,073,394 Automobile: Current $ 1,491,076 1,557,676 702,711 378,962 167,438 95,343 — — $ 4,393,206 30-89 days past due 6,926 13,324 7,284 7,239 5,464 4,249 — — 44,486 Accruing loans past due — — — — — — — — — Nonaccrual 2,493 10,698 7,372 7,520 5,620 5,881 — — 39,584 Total automobile $ 1,500,495 1,581,698 717,367 393,721 178,522 105,473 — — $ 4,477,276 Other: Current $ 274,530 172,238 58,339 38,439 8,217 23,163 1,375,049 8,221 $ 1,958,196 30-89 days past due 3,783 1,450 326 386 141 569 15,655 651 22,961 Accruing loans past due — — — — — 226 4,643 — 4,869 Nonaccrual 2,745 830 332 371 120 465 44,449 185 49,497 Total other $ 281,058 174,518 58,997 39,196 8,478 24,423 1,439,796 9,057 $ 2,035,523 Total loans and leases at $ 24,853,925 18,747,757 13,072,920 12,737,602 7,534,367 26,755,951 26,197,545 1,664,096 $ 131,564,163
Changes in Allowance for Credit Losses	Changes in the allowance for credit losses for the three months ended September 30, 2023 and 2022 were as follows: Commercial, Real Estate Leasing, etc. Commercial Residential Consumer Total (In thousands) Three Months Ended September 30, 2023 Beginning balance $ 511,929 765,676 118,392 602,369 $ 1,998,366 Provision for credit losses 45,637 73,588 ( 3,390 ) 34,165 150,000 Net charge-offs Charge-offs ( 26,844 ) ( 51,574 ) ( 1,332 ) ( 42,378 ) ( 122,128 ) Recoveries 6,976 4,290 824 13,799 25,889 Net charge-offs ( 19,868 ) ( 47,284 ) ( 508 ) ( 28,579 ) ( 96,239 ) Ending balance $ 537,698 791,980 114,494 607,955 $ 2,052,127 Three Months Ended September 30, 2022 Beginning balance $ 414,473 708,393 124,326 576,598 $ 1,823,790 Provision for credit losses 43,343 26,949 ( 11,169 ) 55,877 115,000 Net charge-offs Charge-offs ( 37,396 ) ( 35,213 ) ( 2,572 ) ( 26,086 ) ( 101,267 ) Recoveries 22,022 401 2,234 13,411 38,068 Net charge-offs ( 15,374 ) ( 34,812 ) ( 338 ) ( 12,675 ) ( 63,199 ) Ending balance $ 442,442 700,530 112,819 619,800 $ 1,875,591 Changes in the allowance for credit losses for the nine months ended September 30, 2023 and 2022 were as follows: Commercial, Financial, Real Estate Leasing, etc. Commercial Residential Consumer Total (In thousands) Nine Months Ended September 30, 2023 Beginning balance $ 502,153 676,684 115,092 631,402 $ 1,925,331 Provision for credit losses 69,801 290,672 ( 955 ) 60,482 420,000 Net charge-offs Charge-offs ( 67,104 ) ( 183,548 ) ( 4,105 ) ( 124,534 ) ( 379,291 ) Recoveries 32,848 8,172 4,462 40,605 86,087 Net (charge-offs) recoveries ( 34,256 ) ( 175,376 ) 357 ( 83,929 ) ( 293,204 ) Ending balance $ 537,698 791,980 114,494 607,955 $ 2,052,127 Nine Months Ended September 30, 2022 Beginning balance $ 283,899 557,239 71,726 556,362 $ 1,469,226 Allowance on acquired PCD loans 41,003 55,812 1,833 352 99,000 Provision for credit losses (a) 167,985 116,288 40,719 102,008 427,000 Net charge-offs Charge-offs (b) ( 94,555 ) ( 45,809 ) ( 9,407 ) ( 78,148 ) ( 227,919 ) Recoveries 44,110 17,000 7,948 39,226 108,284 Net charge-offs ( 50,445 ) ( 28,809 ) ( 1,459 ) ( 38,922 ) ( 119,635 ) Ending balance $ 442,442 700,530 112,819 619,800 $ 1,875,591 ________________________________________________________________________________________________ (a) Includes $ 242 million related to non-PCD acquired loans for the nine months ended September 30, 2022. (b) For the nine months ended September 30, 2022, net charge-offs do not reflect $ 33 million of charge offs related to PCD acquired loans.
Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans	Information with respect to loans and leases that were considered nonaccrual at the beginning and end of the reporting period and the interest income recognized on such loans for the three-month and nine-month periods ended September 30, 2023 and 2022 follows: Amortized Cost with Allowance Amortized Cost without Allowance Total Amortized Cost Interest Income Recognized September 30, 2023 June 30, 2023 January 1, 2023 Three Months Ended September 30, 2023 Nine (In thousands) Commercial, financial, leasing, etc. $ 324,774 $ 160,646 $ 485,420 $ 416,022 $ 347,204 $ 3,726 $ 7,914 Real estate: Commercial 458,720 777,367 1,236,087 1,383,190 1,396,662 12,446 22,379 Residential builder and developer 3,353 — 3,353 1,193 1,229 — 396 Other commercial construction 4,080 131,924 136,004 146,024 124,937 249 1,974 Residential 90,879 149,874 240,753 238,509 272,090 3,480 12,247 Residential — limited documentation 21,634 40,616 62,250 66,614 77,814 426 686 Consumer: Home equity lines and loans 48,737 29,579 78,316 77,090 84,788 1,493 5,172 Recreational finance 20,955 9,569 30,524 32,286 44,630 185 536 Automobile 11,981 3,978 15,959 21,791 39,584 36 107 Other 53,100 172 53,272 52,862 49,497 66 233 Total $ 1,038,213 $ 1,303,725 $ 2,341,938 $ 2,435,581 $ 2,438,435 $ 22,107 $ 51,644 September 30, 2022 June 30, 2022 January 1, 2022 Three Months Ended September 30, 2022 Nine (In thousands) Commercial, financial, leasing, etc. $ 207,841 $ 160,325 $ 368,166 $ 442,496 $ 221,022 $ 4,708 $ 20,423 Real estate: Commercial 394,502 1,011,698 1,406,200 1,476,658 1,069,280 7,059 14,944 Residential builder and developer 1,930 — 1,930 518 3,005 — 1,687 Other commercial construction 25,235 40,952 66,187 73,046 111,405 22 3,398 Residential 160,704 124,691 285,395 331,376 355,858 8,059 21,397 Residential — limited documentation 61,297 34,085 95,382 112,608 122,888 229 456 Consumer: Home equity lines and loans 38,324 39,884 78,208 79,445 70,488 669 3,291 Recreational finance 31,295 7,423 38,718 33,414 27,811 166 488 Automobile 36,075 4,243 40,318 36,266 34,037 35 110 Other 48,741 81 48,822 47,178 44,289 84 268 Total $ 1,005,944 $ 1,423,382 $ 2,429,326 $ 2,633,005 $ 2,060,083 $ 21,031 $ 66,462
Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables	The table that follows summarizes the Company’s loan modification activities to borrowers experiencing financial difficulty for the three-month and nine-month periods ended September 30, 2023: Amortized cost at September 30, 2023 Payment Deferral Interest Rate Reduction Other Combination of Modification Types (a) Total (b) Percent of Total Loan Class at Period End (Dollars in thousands) Three Months Ended September 30, 2023 Commercial, financial, leasing, etc. $ 39,058 $ — $ — $ 1,204 $ 40,262 0.09 % Real estate: Commercial 273,201 — — 6,253 279,454 0.78 % Residential builder and developer — — — — — — Other commercial construction 215,598 — — — 215,598 3.20 % Residential 53,239 — — 1,446 54,685 0.24 % Residential — limited documentation 1,721 — — — 1,721 0.18 % Consumer: Home equity lines and loans 125 — — 150 275 0.01 % Recreational finance 40 — — — 40 — Automobile 61 — — — 61 — Other — — — — — — Total $ 583,043 $ — $ — $ 9,053 $ 592,096 0.45 % Nine Months Ended September 30, 2023 Commercial, financial, leasing, etc. $ 93,583 $ 381 $ — $ 1,659 $ 95,623 0.21 % Real estate: Commercial 440,195 — — 14,250 454,445 1.27 % Residential builder and developer 70,683 — — — 70,683 6.42 % Other commercial construction 431,668 — — 8,253 439,921 6.54 % Residential 120,632 — — 4,525 125,157 0.56 % Residential — limited documentation 9,971 — — 699 10,670 1.11 % Consumer: Home equity lines and loans 482 134 — 437 1,053 0.02 % Recreational finance 240 — — — 240 — Automobile 274 — — — 274 0.01 % Other — — — — — — Total $ 1,167,728 $ 515 $ — $ 29,823 $ 1,198,066 0.91 % (a) Predominantly payment deferrals combined with interest rate reductions. (b) Includes approximately $ 45 million and $ 92 million, respectively, of loans guaranteed by government-related entities (predominantly first lien residential mortgage loans) for the three-month and nine-month periods ended September 30, 2023 .
Summary of Payment Status of Loans Modified	The following table summarizes the payment status, at September 30, 2023, of loans that were modified for the nine-month period ended September 30, 2023 : Payment status at September 30, 2023 (amortized cost) Current 30-89 Days Past Due Past Due 90 Days or More (a) Total Nine Months Ended September 30, 2023 (In thousands) Commercial, financial, leasing, etc. $ 81,558 $ 2,326 $ 11,739 $ 95,623 Real estate: Commercial 433,428 19,022 1,995 454,445 Residential builder and developer 70,683 — — 70,683 Other commercial construction 439,921 — — 439,921 Residential (b) 79,331 33,344 12,482 125,157 Residential — limited documentation 7,943 932 1,795 10,670 Consumer: Home equity lines and loans 1,034 19 — 1,053 Recreational finance 240 — — 240 Automobile 274 — — 274 Other — — — — Total $ 1,114,412 $ 55,643 $ 28,011 $ 1,198,066 (a) Predominantly loan modifications with payment deferrals. (b) Includes loans guaranteed by government-related entities classified as 30-89 days past due of $ 28 million and as past due 90 days or more of $ 11 million.
Loan Modification Activities that were Considered Troubled Debt Restructurings	The table that follows summarizes the Company’s loan modification activities that were considered troubled debt restructurings for the three-month and nine-month periods ended September 30, 2022. The table is not comparative to the preceding table. The Company no longer designates modified loans as a troubled debt restructuring in conjunction with the adoption of amended accounting guidance on January 1, 2023. 4. Loans and leases and the allowance for credit losses, continued Post-modification (a) Number Pre- Principal Deferral Interest Rate Reduction Other Combination of Concession Types Total (Dollars in thousands) Three Months Ended September 30, 2022 Commercial, financial, leasing, etc. 70 $ 32,451 $ 11,237 $ 446 $ 229 $ 21,519 $ 33,431 Real estate: Commercial 14 22,951 7,222 — 122 15,543 22,887 Residential 57 14,380 11,094 — — 3,470 14,564 Residential — limited documentation 2 155 155 — — — 155 Consumer: Home equity lines and loans 25 1,700 1,504 — — 196 1,700 Recreational finance 167 6,937 6,937 — — — 6,937 Automobile 474 9,755 9,755 — — — 9,755 Other 30 371 371 — — — 371 Total 839 $ 88,700 $ 48,275 $ 446 $ 351 $ 40,728 $ 89,800 Nine Months Ended September 30, 2022 Commercial, financial, leasing, etc. 147 $ 79,437 $ 49,671 $ 455 $ 983 $ 30,262 $ 81,371 Real estate: Commercial 44 33,349 13,052 — 2,223 17,728 33,003 Residential 221 56,912 40,821 — — 18,469 59,290 Residential — limited documentation 7 1,231 1,049 — — 193 1,242 Consumer: — Home equity lines and loans 93 6,483 6,089 — — 461 6,550 Recreational finance 514 19,138 19,131 — — — 19,131 Automobile 1,537 29,789 29,759 — — — 29,759 Other 128 1,170 1,170 — — — 1,170 Total 2,691 $ 227,509 $ 160,742 $ 455 $ 3,206 $ 67,113 $ 231,516 _____________________________________________ (a) Financial effects impacting the recorded investment included principal payments or advances, ch arge-offs and capitalized escrow arrearages. The present value of interest rate concessions, discounted at the effective rate of the original loan, was not material.

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
Borrowings (Tables)	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Borrowings	September 30, 2023 December 31, 2022 (In thousands) Short-term borrowings Federal funds purchased and repurchase agreements $ 530,663 $ 354,670 FHLB Advances 6,200,000 3,200,281 Total short-term borrowings $ 6,730,663 $ 3,554,951 Long-term borrowings Asset-backed notes $ 516,668 $ — FHLB Advances 4,956 5,183 Senior notes - M&T 1,377,985 1,220,965 Senior notes - M&T Bank 3,741,161 1,249,141 Subordinated notes - M&T 76,339 77,337 Subordinated notes - M&T Bank 857,876 866,296 Junior subordinated debentures - M&T 538,932 536,080 Other 9,509 9,535 Total long-term borrowings $ 7,123,426 $ 3,964,537

Revenue from contracts with c_2

Revenue from contracts with customers (Tables)	9 Months Ended
Revenue from contracts with customers (Tables)	Sep. 30, 2023
ASU 2014-09 [Member]
Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance	The following tables summarize sources of the Company’s noninterest income during the three-month and nine-month periods ended September 30, 2023 and 2022 that are subject to the revenue recognition accounting guidance. Business Banking Commercial Banking Commercial Real Estate Discretionary Portfolio Residential Mortgage Banking Retail Banking All Other Total Three Months Ended September 30, 2023 (In thousands) Classification in Consolidated Service charges on deposit accounts $ 21,749 31,237 4,551 — — 62,011 1,812 $ 121,360 Trust income 23 — — — — — 155,069 155,092 Brokerage services income — — — — — — 26,988 26,988 Other revenues from operations: Merchant discount and credit card fees 17,021 19,494 1,171 — — 4,795 360 42,841 Other — 5,839 942 13 125 7,605 765 15,289 $ 38,793 56,570 6,664 13 125 74,411 184,994 $ 361,570 Three Months Ended September 30, 2022 Classification in Consolidated Service charges on deposit accounts $ 19,277 30,406 3,683 — — 61,223 624 $ 115,213 Trust income — — — — — — 186,577 186,577 Brokerage services income — — — — — — 21,086 21,086 Other revenues from operations: Merchant discount and credit card fees 16,234 17,731 1,104 — — 6,874 561 42,504 Other — 9,878 1,961 904 558 3,980 8,767 26,048 $ 35,511 58,015 6,748 904 558 72,077 217,615 $ 391,428 Business Banking Commercial Banking Commercial Real Estate Discretionary Portfolio Residential Mortgage Banking Retail Banking All Other Total Nine Months Ended September 30, 2023 (In thousands) Classification in Consolidated Service charges on deposit accounts $ 62,097 89,940 13,163 — — 183,141 5,262 $ 353,603 Trust income 52 — — — — — 521,305 521,357 Brokerage services income — — — — — — 76,155 76,155 Other revenues from operations: Merchant discount and credit card fees 48,206 53,056 3,406 — — 16,345 992 122,005 Other — 16,441 3,460 51 676 22,679 2,922 46,229 $ 110,355 159,437 20,029 51 676 222,165 606,636 $ 1,119,349 Nine Months Ended September 30, 2022 Classification in Consolidated Service charges on deposit accounts $ 53,581 85,806 10,903 — — 185,990 4,610 $ 340,890 Trust income — — — — — — 545,874 545,874 Brokerage services income — — — — — — 65,414 65,414 Other revenues from operations: Merchant discount and credit card fees 45,874 48,044 2,836 — — 19,408 946 117,108 Other — 13,040 8,228 2,468 3,413 16,752 33,416 77,317 $ 99,455 146,890 21,967 2,468 3,413 222,150 650,260 $ 1,146,603

Pension plans and other postr_2

Pension plans and other postretirement benefits (Tables)	9 Months Ended
Pension plans and other postretirement benefits (Tables)	Sep. 30, 2023
Retirement Benefits [Abstract]
Net Periodic Defined Benefit Cost for Defined Benefit Plans	The Company provides defined benefit pension and other postretirement benefits (including health care and life insurance benefits) to qualified retired employees. Net periodic cost (benefit) for defined benefit plans consisted of the following: Pension Other Three Months Ended September 30 2023 2022 2023 2022 (In thousands) Service cost $ 2,837 $ 4,423 $ 400 $ 689 Interest cost on projected benefit obligation 28,862 22,060 703 581 Expected return on plan assets ( 50,315 ) ( 50,188 ) — — Amortization of prior service cost (credit) 52 129 ( 515 ) ( 693 ) Amortization of net actuarial loss (gain) ( 537 ) 4,974 ( 692 ) ( 370 ) Net periodic cost (benefit) $ ( 19,101 ) $ ( 18,602 ) $ ( 104 ) $ 207 Pension Other Nine Months Ended September 30 2023 2022 2023 2022 (In thousands) Service cost $ 8,512 $ 13,237 $ 1,200 $ 1,914 Interest cost on projected benefit obligation 86,585 60,407 2,109 1,607 Expected return on plan assets ( 150,945 ) ( 137,421 ) — — Amortization of prior service cost (credit) 155 387 ( 1,545 ) ( 2,079 ) Amortization of net actuarial loss (gain) ( 1,610 ) 14,921 ( 2,076 ) ( 1,111 ) Net periodic cost (benefit) $ ( 57,303 ) $ ( 48,469 ) $ ( 312 ) $ 331

Earnings per common share (Tabl

Earnings per common share (Tables)	9 Months Ended
Earnings per common share (Tables)	Sep. 30, 2023
Earnings Per Share [Abstract]
Computations of Basic Earnings Per Common Share	The computations of basic earnings per common share follow: Three Months Ended September 30 Nine Months Ended September 30 2023 2022 2023 2022 (In thousands, except per share) Income available to common shareholders: Net income $ 689,941 $ 646,596 $ 2,258,599 $ 1,226,292 Less: Preferred stock dividends ( 24,941 ) ( 24,941 ) ( 74,822 ) ( 71,647 ) Net income available to common equity 665,000 621,655 2,183,777 1,154,645 Less: Income attributable to unvested stock-based ( 1,237 ) ( 1,106 ) ( 3,975 ) ( 2,245 ) Net income available to common shareholders $ 663,763 $ 620,549 $ 2,179,802 $ 1,152,400 Weighted-average shares outstanding: Common shares outstanding (including common stock 166,217 174,921 166,787 160,793 Less: Unvested stock-based compensation awards ( 308 ) ( 312 ) ( 299 ) ( 319 ) Weighted-average shares outstanding 165,909 174,609 166,488 160,474 Basic earnings per common share $ 4.00 $ 3.55 $ 13.09 $ 7.18
Computations of Diluted Earnings Per Common Share	The computations of diluted earnings per common share follow: Three Months Ended September 30 Nine Months Ended September 30 2023 2022 2023 2022 (In thousands, except per share) Net income available to common equity $ 665,000 $ 621,655 $ 2,183,777 $ 1,154,645 Less: Income attributable to unvested stock-based ( 1,234 ) ( 1,101 ) ( 3,965 ) ( 2,239 ) Net income available to common shareholders $ 663,766 $ 620,554 $ 2,179,812 $ 1,152,406 Adjusted weighted-average shares outstanding: Common shares outstanding (including common stock 166,217 174,921 166,787 160,793 Less: Unvested stock-based compensation awards ( 308 ) ( 312 ) ( 299 ) ( 319 ) Plus: Incremental shares from assumed conversion 661 1,073 605 821 Adjusted weighted-average shares outstanding 166,570 175,682 167,093 161,295 Diluted earnings per common share $ 3.98 $ 3.53 $ 13.05 $ 7.14

Comprehensive income (Tables)

Comprehensive income (Tables)	9 Months Ended
Comprehensive income (Tables)	Sep. 30, 2023
Equity [Abstract]
Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income	The following tables display the components of other comprehensive income (loss) and amounts reclassified from accumulated other comprehensive income (loss) to net income: Investment Defined Benefit Total Income Securities Plans Other Before Tax Tax Net (In thousands) Balance — January 1, 2023 $ ( 444,192 ) ( 272,856 ) ( 349,129 ) $ ( 1,066,177 ) 276,147 $ ( 790,030 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 2,366 ) — — ( 2,366 ) 588 ( 1,778 ) Foreign currency translation adjustment — — 71 71 ( 18 ) 53 Unrealized losses on cash flow hedges — — ( 365,739 ) ( 365,739 ) 90,679 ( 275,060 ) Total other comprehensive income (loss) before ( 2,366 ) — ( 365,668 ) ( 368,034 ) 91,249 ( 276,785 ) Amounts reclassified from accumulated other comprehensive Accretion of net gain on terminated cash flow hedges — — ( 91 ) ( 91 ) (b) 23 ( 68 ) Net yield adjustment from cash flow hedges — — 173,051 173,051 (a) ( 43,535 ) 129,516 Amortization of prior service credit — ( 1,390 ) — ( 1,390 ) (c) 155 ( 1,235 ) Amortization of actuarial gains — ( 3,686 ) — ( 3,686 ) (c) 410 ( 3,276 ) Total other comprehensive income (loss) ( 2,366 ) ( 5,076 ) ( 192,708 ) ( 200,150 ) 48,302 ( 151,848 ) Balance — September 30, 2023 $ ( 446,558 ) ( 277,932 ) ( 541,837 ) $ ( 1,266,327 ) 324,449 $ ( 941,878 ) Balance — January 1, 2022 $ 104,691 ( 360,276 ) 83,531 $ ( 172,054 ) 44,476 $ ( 127,578 ) Other comprehensive income (loss) before reclassifications: Unrealized holding losses, net ( 576,266 ) — — ( 576,266 ) 149,186 ( 427,080 ) Foreign currency translation adjustment — — ( 14,564 ) ( 14,564 ) 3,293 ( 11,271 ) Unrealized losses on cash flow hedges — — ( 429,310 ) ( 429,310 ) 111,150 ( 318,160 ) Total other comprehensive income (loss) before ( 576,266 ) — ( 443,874 ) ( 1,020,140 ) 263,629 ( 756,511 ) Amounts reclassified from accumulated other comprehensive Amortization of unrealized holding losses on 1,766 — — 1,766 (a) ( 456 ) 1,310 Accretion of net gain on terminated cash flow hedges — — ( 90 ) ( 90 ) (b) 24 ( 66 ) Net yield adjustment from cash flow hedges — — ( 35,500 ) ( 35,500 ) (a) 9,192 ( 26,308 ) Amortization of prior service credit — ( 1,692 ) — ( 1,692 ) (c) 413 ( 1,279 ) Amortization of actuarial losses — 13,810 — 13,810 (c) ( 3,371 ) 10,439 Total other comprehensive income (loss) ( 574,500 ) 12,118 ( 479,464 ) ( 1,041,846 ) 269,431 ( 772,415 ) Balance — September 30, 2022 $ ( 469,809 ) ( 348,158 ) ( 395,933 ) $ ( 1,213,900 ) 313,907 $ ( 899,993 ) (a) Included in interest income. (b) Included in interest expense. (c) Included in other costs of operations.
Accumulated Other Comprehensive Income (Loss), Net	Accumulated other comprehensive income (loss), net consisted of the following: Defined Investment Benefit Securities Plans Other Total (In thousands) Balance — December 31, 2022 $ ( 329,168 ) $ ( 202,186 ) $ ( 258,676 ) $ ( 790,030 ) Net loss during period ( 1,778 ) ( 4,511 ) ( 145,559 ) ( 151,848 ) Balance — September 30, 2023 $ ( 330,946 ) $ ( 206,697 ) $ ( 404,235 ) $ ( 941,878 )

Derivative financial instrume_2

Derivative financial instruments (Tables)	9 Months Ended
Derivative financial instruments (Tables)	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Information about Interest Rate Swap Agreements	Information about interest rate swap agreements entered into for interest rate risk management purposes summarized by type of financial instrument the swap agreements were intended to hedge follows: Weighted- Estimated Notional Average Average Rate Fair Value Amount Maturity Fixed Variable Gain (Loss) (a) (In thousands) (In years) (In thousands) September 30, 2023 Fair value hedges: Fixed rate long-term borrowings (b) $ 2,000,000 6.6 3.11 % 5.74 % $ 3,108 Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (c) 23,977,000 2.0 3.45 % 5.32 % 9,077 Total $ 25,977,000 2.4 $ 12,185 December 31, 2022 Fair value hedges: Fixed rate long-term borrowings (b) $ 1,500,000 3.3 2.98 % 4.52 % $ ( 833 ) Cash flow hedges: Interest payments on variable rate commercial real estate loans (b) (d) 15,900,000 1.4 1.91 % 4.38 % ( 7,059 ) Total $ 17,400,000 1.6 $ ( 7,892 ) (a) Certain clearinghouse exchanges consider payments by counterparties for variation margin on derivative instruments to be settlements of those positions. The impact of such payments for interest rate swap agreements designated as fair value hedges was a net settlement of losses of $ 163.9 million at September 30, 2023 and $ 65.0 million at December 31, 2022. The impact of such payments on interest rate swap agreements designated as cash flow hedges was a net settlement of losses of $ 538.5 million at September 30, 2023 and $ 329.7 million at December 31, 2022. (b) Under the terms of these agreements, the Company receives settlement amounts at a fixed rate and pays at a variable rate. (c) Includes notional amount and terms of $ 9.4 billion of forward-starting interest rate swap agreements that become effective in 2023 and 2024. (d) Includes notional amount and terms of $ 4.7 billion of forward-starting interest rate swap agreements that become effective in 2023. 10. Derivative financial instruments, continued
Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet	Information about the fair values of derivative instruments in the Company’s Consolidated Balance Sheet and Consolidated Statement of Income follows: Asset Derivatives Liability Derivatives Fair Value Fair Value September 30, December 31, September 30, December 31, 2023 2022 2023 2022 (In thousands) Derivatives designated and qualifying as hedging instruments (a) Interest rate swap agreements $ 12,471 $ 1,202 $ 286 $ 9,094 Commitments to sell real estate loans 5,998 3,037 614 9 18,469 4,239 900 9,103 Derivatives not designated and qualifying as hedging instruments (a) Mortgage banking: Mortgage-related commitments to originate real estate loans for sale 2,380 452 53,783 46,025 Commitments to sell real estate loans 60,036 51,410 83 14 62,416 51,862 53,866 46,039 Other: Interest rate contracts (b) 323,865 355,806 1,420,668 1,278,180 Foreign exchange and other option and futures contracts 15,552 24,062 14,361 22,004 339,417 379,868 1,435,029 1,300,184 Total derivatives $ 420,302 $ 435,969 $ 1,489,795 $ 1,355,326 (a) Asset derivatives are reported in other assets and liability derivatives are reported in other liabilities. (b) The impact of variation margin payments at September 30, 2023 and December 31, 2022 was a reduction of the estimated fair value of interest rate contracts not designated as hedging instruments in an asset position of $ 1.2 billion and $ 1.1 billion , respectively, as of each period end, and in a liability position of $ 15.7 million and $ 29.2 million , respectively. Carrying Amount of the Hedged Item Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount of the Hedged Item September 30, 2023 December 31, 2022 September 30, 2023 December 31, 2022 (In thousands) Location in the Consolidated Balance Sheet Hedges Long-term debt $ 1,834,030 $ 1,433,731 $ ( 161,230 ) $ ( 65,310 )
Information about Fair Values of Derivative Instruments in Consolidated Statement of Income	Amount of Gain (Loss) Recognized Three Months Ended September 30 2023 2022 Derivative Hedged Item Derivative Hedged Item (In thousands) Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 60,605 ) 60,737 $ ( 50,976 ) 50,821 Derivatives not designated as hedging instruments Interest rate contracts (b) $ 6,311 $ 6,946 Foreign exchange and other option and futures contracts (b) 4,232 4,462 Total $ 10,543 $ 11,408 10. Derivative financial instruments, continued Amount of Gain (Loss) Recognized Nine Months Ended September 30 2023 2022 Derivative Hedged Item Derivative Hedged Item (In thousands) Derivatives in fair value hedging relationships Interest rate swap agreements: Fixed rate long-term borrowings (a) $ ( 94,997 ) 95,920 $ ( 114,932 ) 114,581 Derivatives not designated as hedging instruments Interest rate contracts (b) $ 25,027 $ 17,907 Foreign exchange and other option and futures contracts (b) 11,377 10,701 Total $ 36,404 $ 28,608 (a) Reported as an adjustment to interest expense. (b) Reported as trading account and other non-hedging derivative gains.

Fair value measurements (Tables

Fair value measurements (Tables)	9 Months Ended
Fair value measurements (Tables)	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis	The following tables present assets and liabilities at September 30, 2023 and December 31, 2022 measured at estimated fair value on a recurring basis: Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) September 30, 2023 Trading account $ 136,998 $ 118,838 $ 18,160 $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,735,107 — 7,735,107 — Mortgage-backed securities: Government issued or guaranteed Commercial 525,469 — 525,469 — Residential 2,168,287 — 2,168,287 — Other debt securities 163,546 — 163,546 — 10,592,409 — 10,592,409 — Equity securities 259,216 252,080 7,136 — Real estate loans held for sale 430,720 — 430,720 — Other assets (a) 420,302 — 417,922 2,380 Total assets $ 11,839,645 $ 370,918 $ 11,466,347 $ 2,380 Other liabilities (a) 1,489,795 — 1,436,012 53,783 Total liabilities $ 1,489,795 $ — $ 1,436,012 $ 53,783 December 31, 2022 Trading account $ 117,847 $ 117,847 $ — $ — Investment securities available for sale: U.S. Treasury and federal agencies 7,670,960 — 7,670,960 — Mortgage-backed securities: Government issued or guaranteed Commercial 574,299 — 574,299 — Residential 2,330,118 — 2,330,118 — Other debt securities 173,584 — 173,584 — 10,748,961 — 10,748,961 — Equity securities 151,458 145,289 6,169 — Real estate loans held for sale 162,393 — 162,393 — Other assets (a) 435,969 — 435,517 452 Total assets $ 11,616,628 $ 263,136 $ 11,353,040 $ 452 Other liabilities (a) 1,355,326 — 1,309,301 46,025 Total liabilities $ 1,355,326 $ — $ 1,309,301 $ 46,025 (a) Comprised predominantly of interest rate swap agreements used for interest rate risk management (Level 2), interest rate and foreign exchange contracts not designated as hedging instruments (Level 2), commitments to sell real estate loans (Level 2) and commitments to originate real estate loans to be held for sale (Level 3).
Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis	The changes in Level 3 assets and liabilities measured at estimated fair value on a recurring basis during the three and nine months ended September 30, 2023 and 2022 were as follows: Other Assets and Other Liabilities Three months ended Nine months ended September 30, September 30, September 30, September 30, (In thousands) Beginning balance $ ( 37,178 ) $ ( 24,181 ) $ ( 45,573 ) $ 6,440 Total gains (losses) realized/unrealized: Included in earnings (a) ( 10,155 ) ( 9,321 ) 6,301 ( 34,630 ) Transfers out of Level 3 (b) ( 4,070 ) ( 14,804 ) ( 12,131 ) ( 20,116 ) Ending balance $ ( 51,403 ) $ ( 48,306 ) $ ( 51,403 ) $ ( 48,306 ) Changes in net unrealized gains (losses) included in earnings $ ( 12,957 ) $ ( 17,160 ) $ ( 12,341 ) $ ( 48,108 ) ___________________________________________________________________________________________________________________________________________ (a) Reported as mortgage banking revenues in the Consolidated Statement of Income and includes the fair value of commitment issuances and expirations. (b) Transfers out of Level 3 consist of interest rate locks transferred to closed loans.
Quantitative Information Related to Significant Unobservable Inputs	The following table presents quantitative information about significant unobservable inputs used in the fair value measurements for certain Level 3 assets and liabilities at September 30, 2023 and December 31, 2022: Fair Value Valuation Unobservable Range (In thousands) September 30, 2023 Recurring fair value measurements Net other assets (liabilities) (a) $ ( 51,403 ) Discounted cash flow Commitment expirations 0 % - 99 % ( 8 %) December 31, 2022 Recurring fair value measurements Net other assets (liabilities) (a) $ ( 45,573 ) Discounted cash flow Commitment expirations 0 % - 97 % ( 3 %) (a) Other Level 3 assets (liabilities) consist of commitments to originate real estate loans.
Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities)	The carrying amounts and estimated fair value for financial instrument assets (liabilities) are presented in the following tables: September 30, 2023 Carrying Estimated Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 1,768,864 1,768,864 1,701,427 67,437 — Interest-bearing deposits at banks 30,114,286 30,114,286 — 30,114,286 — Trading account 136,998 136,998 118,838 18,160 — Investment securities 27,336,103 25,529,926 252,080 25,231,860 45,986 Loans and leases: Commercial loans and leases 45,058,033 44,080,119 — — 44,080,119 Commercial real estate loans 43,573,598 41,273,080 — 226,022 41,047,058 Residential real estate loans 23,448,270 20,746,776 — 6,808,082 13,938,694 Consumer loans 20,274,784 19,351,349 — — 19,351,349 Allowance for credit losses ( 2,052,127 ) — — — — Loans and leases, net 130,302,558 125,451,324 — 7,034,104 118,417,220 Accrued interest receivable 734,036 734,036 — 734,036 — Financial liabilities: Noninterest-bearing deposits $ ( 53,786,987 ) ( 53,786,987 ) — ( 53,786,987 ) — Savings and interest-checking deposits ( 90,297,219 ) ( 90,297,219 ) — ( 90,297,219 ) — Time deposits ( 20,043,601 ) ( 19,931,959 ) — ( 19,931,959 ) — Short-term borrowings ( 6,730,663 ) ( 6,730,663 ) — ( 6,730,663 ) — Long-term borrowings ( 7,123,426 ) ( 6,811,799 ) — ( 6,811,799 ) — Accrued interest payable ( 401,752 ) ( 401,752 ) — ( 401,752 ) — Other financial instruments: Commitments to originate real estate $ ( 51,403 ) ( 51,403 ) — — ( 51,403 ) Commitments to sell real estate loans 65,337 65,337 — 65,337 — Other credit-related commitments ( 150,708 ) ( 150,708 ) — — ( 150,708 ) Interest rate swap agreements used 12,185 12,185 — 12,185 — Interest rate and foreign exchange contracts ( 1,095,612 ) ( 1,095,612 ) — ( 1,095,612 ) — 12. Fair value measurements, continued December 31, 2022 Carrying Estimated Level 1 Level 2 Level 3 (In thousands) Financial assets: Cash and cash equivalents $ 1,517,244 1,517,244 1,371,688 145,556 — Interest-bearing deposits at banks 24,958,719 24,958,719 — 24,958,719 — Federal funds sold 3,000 3,000 — 3,000 — Trading account 117,847 117,847 117,847 — — Investment securities 25,210,871 24,056,322 145,289 23,860,445 50,588 Loans and leases: Commercial loans and leases 41,850,566 41,139,985 — — 41,139,985 Commercial real estate loans 45,364,571 43,214,646 — 130,652 43,083,994 Residential real estate loans 23,755,947 21,780,214 — 7,049,540 14,730,674 Consumer loans 20,593,079 20,093,523 — — 20,093,523 Allowance for credit losses ( 1,925,331 ) — — — — Loans and leases, net 129,638,832 126,228,368 — 7,180,192 119,048,176 Accrued interest receivable 646,250 646,250 — 646,250 — Financial liabilities: Noninterest-bearing deposits $ ( 65,501,860 ) ( 65,501,860 ) — ( 65,501,860 ) — Savings and interest-checking deposits ( 87,911,463 ) ( 87,911,463 ) — ( 87,911,463 ) — Time deposits ( 10,101,545 ) ( 10,143,110 ) — ( 10,143,110 ) — Short-term borrowings ( 3,554,951 ) ( 3,554,951 ) — ( 3,554,951 ) — Long-term borrowings ( 3,964,537 ) ( 3,926,489 ) — ( 3,926,489 ) — Accrued interest payable ( 81,356 ) ( 81,356 ) — ( 81,356 ) — Other financial instruments: Commitments to originate real estate $ ( 45,573 ) ( 45,573 ) — — ( 45,573 ) Commitments to sell real estate loans 54,424 54,424 — 54,424 — Other credit-related commitments ( 148,772 ) ( 148,772 ) — — ( 148,772 ) Interest rate swap agreements used ( 7,892 ) ( 7,892 ) — ( 7,892 ) — Interest rate and foreign exchange contracts ( 920,316 ) ( 920,316 ) — ( 920,316 ) —

Commitments and contingencies (

Commitments and contingencies (Tables)	9 Months Ended
Commitments and contingencies (Tables)	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities Outstanding	The following table presents the Company's significant commitments. Certain of these commitments are not included in the Company's Consolidated Balance Sheet. September 30, December 31, 2023 2022 (In thousands) Commitments to extend credit Home equity lines of credit $ 8,167,368 $ 8,261,560 Commercial real estate loans to be sold 338,569 348,701 Other commercial real estate 6,224,142 5,776,116 Residential real estate loans to be sold 237,683 31,208 Other residential real estate 406,667 505,121 Commercial and other 33,670,583 32,625,840 Standby letters of credit 2,333,434 2,376,644 Commercial letters of credit 72,053 65,066 Financial guarantees and indemnification contracts 4,209,726 4,022,432 Commitments to sell real estate loans 948,190 533,458

Segment information (Tables)

Segment information (Tables)	9 Months Ended
Segment information (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Information about Company's Segments	Three Months Ended September 30, 2022 Total Revenues as Previously Reported Impact of Changes Total Revenues as Reclassified Net Income (Loss) as Previously Reported Impact of Changes Net Income (Loss) as Reclassified (In thousands) Business Banking $ 241,629 — $ 241,629 $ 94,094 ( 1,476 ) $ 92,618 Commercial Banking 510,549 ( 1,173 ) 509,376 214,063 ( 2,838 ) 211,225 Commercial Real Estate 234,479 12,635 247,114 94,937 15,097 110,034 Discretionary Portfolio 36,622 ( 24,981 ) 11,641 11,813 ( 18,074 ) ( 6,261 ) Residential Mortgage Banking 95,091 — 95,091 ( 3,283 ) 1,173 ( 2,110 ) Retail Banking 650,229 ( 2 ) 650,227 181,639 1,155 182,794 All Other 473,171 13,521 486,692 53,333 4,963 58,296 Total $ 2,241,770 — $ 2,241,770 $ 646,596 — $ 646,596 Nine Months Ended September 30, 2022 Total Revenues as Previously Reported Impact of Changes Total Revenues as Reclassified Net Income (Loss) as Previously Reported Impact of Changes Net Income (Loss) as Reclassified (In thousands) Business Banking $ 586,605 — $ 586,605 $ 205,741 ( 6,008 ) $ 199,733 Commercial Banking 1,239,300 ( 2,550 ) 1,236,750 521,749 ( 20,254 ) 501,495 Commercial Real Estate 676,176 29,707 705,883 314,284 24,941 339,225 Discretionary Portfolio 190,761 ( 39,866 ) 150,895 103,283 ( 30,448 ) 72,835 Residential Mortgage Banking 346,409 — 346,409 35,028 ( 2,095 ) 32,933 Retail Banking 1,523,992 — 1,523,992 379,688 ( 13,243 ) 366,445 All Other 1,106,405 12,709 1,119,114 ( 333,481 ) 47,107 ( 286,374 ) Total $ 5,669,648 — $ 5,669,648 $ 1,226,292 — $ 1,226,292 14. Segment information, continued Information about the Company's segments follows: Three Months Ended September 30 2023 2022 Total Inter- Net Total Inter- Net (In thousands) Business Banking $ 291,839 $ 980 $ 117,290 $ 241,629 $ 663 $ 92,618 Commercial Banking 453,326 8,224 167,714 509,376 802 211,225 Commercial Real Estate 231,303 188 72,442 247,114 249 110,034 Discretionary Portfolio ( 20,672 ) ( 14,110 ) ( 21,586 ) 11,641 ( 23,044 ) ( 6,261 ) Residential Mortgage Banking 100,444 19,373 ( 14,422 ) 95,091 35,647 ( 2,110 ) Retail Banking 876,002 ( 35 ) 342,700 650,227 ( 5 ) 182,794 All Other 402,727 ( 14,620 ) 25,803 486,692 ( 14,312 ) 58,296 Total $ 2,334,969 $ — $ 689,941 $ 2,241,770 $ — $ 646,596 Nine Months Ended September 30 2023 2022 Total Inter- Net Total Inter- Net (In thousands) Business Banking $ 842,571 $ 2,904 $ 346,704 $ 586,605 $ 2,060 $ 199,733 Commercial Banking 1,420,971 27,742 553,255 1,236,750 2,605 501,495 Commercial Real Estate 674,276 745 192,539 705,883 687 339,225 Discretionary Portfolio ( 78,005 ) ( 44,124 ) ( 93,678 ) 150,895 ( 74,952 ) 72,835 Residential Mortgage Banking 280,654 60,599 ( 41,676 ) 346,409 110,986 32,933 Retail Banking 2,572,410 ( 113 ) 995,927 1,523,992 ( 12 ) 366,445 All Other 1,629,789 ( 47,753 ) 305,528 1,119,114 ( 41,374 ) ( 286,374 ) Total $ 7,342,666 $ — $ 2,258,599 $ 5,669,648 $ — $ 1,226,292 Average Total Assets Nine Months Ended September 30 Year Ended 31 2023 2022 2022 (In millions) Business Banking $ 7,968 $ 7,515 $ 7,597 Commercial Banking (b) 49,373 39,293 40,930 Commercial Real Estate (b) 31,878 29,982 30,599 Discretionary Portfolio 50,900 40,987 42,657 Residential Mortgage Banking 2,746 4,370 3,986 Retail Banking 21,261 20,063 20,312 All Other 40,140 45,185 44,171 Total $ 204,266 $ 187,395 $ 190,252 (a) Total revenues are comprised of net interest income and other income. Net interest income is the difference between taxable-equivalent interest earned on assets and interest paid on liabilities owed by a segment and a funding charge (credit) based on the Company's internal funds transfer and allocation methodology. Segments are charged a cost to fund any assets (e.g. loans) and are paid a funding credit for any funds provided (e.g. deposits). The taxable-equivalent adjustment aggregated $ 14.3 million and $ 11.8 million for the three-month periods ended September 30, 2023 and 2022 , respectively, and $ 41.7 million and $ 25.8 million for the nine-month periods ended September 30, 2023 and 2022 and is eliminated in "All Other" total revenues. Intersegment revenues are included in total revenues of the reportable segments. The elimination of intersegment revenues is included in the determination of "All Other" total revenues. (b) For the nine months ended September 30, 2022 , average total assets totaling approximately $ 1.17 billion were reclassified to the Commercial Real Estate segment from the Commercial Banking segment as a result of the realignment of certain lending relationships within the hospitality sector.

Acquisition and Divestiture - A

Acquisition and Divestiture - Additional Information (Details) - USD ($)			3 Months Ended		9 Months Ended
	Apr. 29, 2023	Apr. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Carrying Value			$ 2,010,600,000		$ 2,010,600,000			$ 2,010,600,000
Goodwill			8,465,089,000		8,465,089,000			8,490,089,000
ACL for non-PCD loan and leases		$ 242,000,000
Initial estimate of expected credit losses		99,000,000
Assets			209,124,316,000		209,124,316,000			200,729,841,000
Shareholders' equity			26,196,502,000	$ 25,256,493,000	26,196,502,000	$ 25,256,493,000	$ 25,800,933,000	25,317,990,000	$ 25,794,531,000	$ 17,903,405,000
Net Income (Loss)			689,941,000	646,596,000	2,258,599,000	1,226,292,000
Fiduciary and Trust [Member]
Business Acquisition [Line Items]
Revenue from contract with customer			155,092,000	186,577,000	521,357,000	545,874,000
Collective Investment Trust [Member] \| Fiduciary and Trust [Member]
Business Acquisition [Line Items]
Gain (loss) on sale of subsidiary, pre-tax	$ 225,000,000
Revenue from contract with customer					60,000,000	121,000,000
Common Stock [Member]
Business Acquisition [Line Items]
Shareholders' equity			89,718,000	89,718,000	89,718,000	89,718,000	$ 89,718,000	$ 89,718,000	$ 89,718,000	$ 79,871,000
Peoples United Financial Inc [Member]
Business Acquisition [Line Items]
Business combination, market value		$ 8,400,000,000
Common stock, price per share		$ 164.66
Assets		$ 60,244,818,000
Goodwill		3,908,245,000
Core deposits and other intangible assets		$ 261,000,000
Peoples United Financial Inc [Member] \| Investment Banking, Legal and Other Services [Member]
Business Acquisition [Line Items]
Merger-related expenses			$ 0	$ 53,000,000	$ 0	$ 293,000,000
Peoples United Financial Inc [Member] \| Core Deposit and Other Intangible Assets [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Amortization period		3 years
Peoples United Financial Inc [Member] \| Core Deposit and Other Intangible Assets [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Amortization period		7 years
Peoples United Financial Inc [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Common stock issued in transaction		50,325,004
MT [Member]
Business Acquisition [Line Items]
Common stock, price per share		$ 0.118

Acquisition and Divestiture - S

Acquisition and Divestiture - Summary of Identifiable Assets Acquired, Liabilities Assumed and Preferred Stock Exchanged as of Acquisition (Details) - USD ($) $ in Thousands	Apr. 01, 2022	Sep. 30, 2023	Dec. 31, 2022
Liabilities and preferred stock:
Total liabilities and shareholders’ equity		$ 209,124,316	$ 200,729,841
Goodwill		$ 8,465,089	$ 8,490,089
Peoples United Financial Inc [Member]
Consideration:
Common stock issued (50,325,004 shares)	$ 8,286,515
Common stock awards converted	104,810
Cash	1,824
Total consideration	8,393,149
Identifiable assets
Cash and due from banks	395,747
Interest-bearing deposits at banks	9,193,346
Investment securities	11,574,689
Loans and leases	35,840,648
Core deposit and other intangible assets	261,000
Other assets	2,979,388
Total identifiable assets acquired	60,244,818
Liabilities and preferred stock:
Deposits	52,967,915
Borrowings	1,389,012
Other liabilities	1,142,387
Total liabilities assumed	55,499,314
Preferred stock	260,600
Total liabilities and shareholders’ equity	55,759,914
Net assets acquired	4,484,904
Goodwill	$ 3,908,245

Acquisition and Divestiture -_2

Acquisition and Divestiture - Summary of Identifiable Assets Acquired, Liabilities Assumed and Preferred Stock Exchanged as of Acquisition (Parenthetical) (Details)	Apr. 01, 2022 shares
Peoples United Financial Inc [Member]
Business Acquisition [Line Items]
Common shares issued, Shares	50,325,004

Acquisition and Divestiture -_3

Acquisition and Divestiture - Summary of Unpaid Principal Balance to Fair Value of Loans and Leases by Portfolio Segment (Details) - USD ($) $ in Thousands		Apr. 01, 2022	Sep. 30, 2023	Jun. 30, 2023	Jan. 01, 2023	Sep. 30, 2022	Jun. 30, 2022	Jan. 01, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance			$ 2,341,938			$ 2,429,326
Allowance for credit losses at acquisition				$ (2,435,581)	$ (2,438,435)		$ (2,633,005)	$ (2,060,083)
PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance	[1]	$ 3,410,506
Allowance for credit losses at acquisition	[1]	(99,000)
Other discount		(106,814)
Fair value		3,204,692
Non PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance		32,896,454
Other discount	[2]	(260,498)
Fair value		$ 32,635,956

[1] The unpaid principal balance and allowance for credit losses at acquisition is net of charge-offs of $ 33 million recognized on the PCD loans Includes approximately $ 242 million of principal balances not expected to be collected.

Acquisition and Divestiture -_4

Acquisition and Divestiture - Summary of Unpaid Principal Balance to Fair Value of PCD Loans and Leases by Portfolio Segment (Parenthetical) (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
		Apr. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs			$ (122,128)	$ (101,267)	$ (379,291)	$ (227,919)
PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs		$ (33,000)				$ (33,000)
Other discount		(106,814)
Non PCD Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other discount	[1]	(260,498)
Non PCD Acquired Loans Not Expected To Be Collected [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other discount		$ 242,000

[1] Includes approximately $ 242 million of principal balances not expected to be collected.

Acquisition and Divestiture -_5

Acquisition and Divestiture - Summary of Acquisition, Pro Forma Information (Details) - Peoples United Financial Inc [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total revenues	$ 6,134,400	[1]
Net income	$ 1,399,913

[1] Represents the total of net interest income and other income.

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	$ 11,038,966	$ 11,193,152
Investment securities available for sale, gross unrealized gains	154	515
Investment securities available for sale, gross unrealized losses	446,711	444,706
Investment securities available for sale, estimated fair value	10,592,409	10,748,961
Amortized cost for held to maturity	15,571,120	13,529,969
Gross unrealized gains for held to maturity	9,041	10,288
Gross unrealized losses for held to maturity	1,815,218	1,164,837
Estimated fair value for held to maturity	13,764,943	12,375,420
Equity and other securities, Amortized Cost	1,174,046	933,766
Equity securities, Gross Unrealized Gains	2,425	2,120
Equity securities, Gross Unrealized Losses	3,897	3,945
Equity and other securities, Estimated Fair Value	1,172,574	931,941
Other securities, Amortized cost	913,358	780,483
Other securities, Estimated fair value	913,358	780,483
Total debt securities Amortized cost	26,610,086	24,723,121
Total debt securities Gross unrealized gains	9,195	10,803
Total debt securities Gross unrealized losses	2,261,929	1,609,543
Total debt securities Estimated fair value	24,357,352	23,124,381
Readily marketable securities Amortized cost	260,688	153,283
Readily marketable securities Gross unrealized gains	2,425	2,120
Readily marketable securities Gross unrealized losses	3,897	3,945
Readily marketable securities Estimated fair value	259,216	151,458
U.S. Treasury and Federal Agencies [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	1,001,991	7,913,932
Investment securities available for sale, gross unrealized gains		200
Investment securities available for sale, gross unrealized losses	48,706	243,172
Investment securities available for sale, estimated fair value	953,285	7,670,960
Amortized cost for held to maturity	7,935,658	1,054,035
Gross unrealized losses for held to maturity	200,551	45,747
Estimated fair value for held to maturity	7,735,107	1,008,288
Obligations of States and Political Subdivisions [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Amortized cost for held to maturity	2,511,784	2,577,078
Gross unrealized gains for held to maturity		4
Gross unrealized losses for held to maturity	219,149	116,512
Estimated fair value for held to maturity	2,292,635	2,460,570
Commercial [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	544,263	594,779
Investment securities available for sale, gross unrealized losses	18,794	20,480
Investment securities available for sale, estimated fair value	525,469	574,299
Amortized cost for held to maturity	2,031,532	912,431
Gross unrealized losses for held to maturity	233,055	103,528
Estimated fair value for held to maturity	1,798,477	808,903
Residential [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	2,382,810	2,501,334
Investment securities available for sale, gross unrealized gains	8	65
Investment securities available for sale, gross unrealized losses	214,531	171,281
Investment securities available for sale, estimated fair value	2,168,287	2,330,118
Amortized cost for held to maturity	9,979,882	8,934,918
Gross unrealized gains for held to maturity		1,451
Gross unrealized losses for held to maturity	1,306,934	891,063
Estimated fair value for held to maturity	8,672,948	8,045,306
Other Debt Securities [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Investment securities available for sale, amortized cost	176,235	183,107
Investment securities available for sale, gross unrealized gains	146	250
Investment securities available for sale, gross unrealized losses	12,835	9,773
Investment securities available for sale, estimated fair value	163,546	173,584
Amortized cost for held to maturity	1,612	1,765
Estimated fair value for held to maturity	1,612	1,765
Privately Issued [Member]
Schedule Of Amortized Cost And Estimated Fair Value Of Investment Securities [Line Items]
Amortized cost for held to maturity	44,319	49,742
Gross unrealized gains for held to maturity	9,041	8,833
Gross unrealized losses for held to maturity	7,374	7,987
Estimated fair value for held to maturity	$ 45,986	$ 50,588

Investment Securities - Additio

Investment Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
Investment Securities - Additional Information (Detail)	Sep. 30, 2023 USD ($) Security	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Security	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Summary of Investment Holdings [Line Items]
Gross realized gains(loss) on sale of investment securities	$ 0	$ 0	$ 0	$ 0
Gains (losses) on equity securities	$ (235,000)	$ (1,108,000)	$ 353,000	$ (1,913,000)
Number of debt securities with aggregate gross unrealized losses \| Security	4,279		4,279
Unrealized losses on individual debt securities			$ (2,300,000,000)
Cost method equity securities	$ 913,000,000		913,000,000
Investment securities pledged to secure debt carrying value	8,200,000,000		8,200,000,000		$ 7,900,000,000
Carrying value of investment securities pledged related to repurchase transactions	696,000,000		696,000,000		567,000,000
Available-for-Sale Securities [Member]
Summary of Investment Holdings [Line Items]
Allowance for credit losses	$ 0		$ 0		$ 0

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt securities available for sale:
Due in one year or less	$ 4,619,339
Due after one year through five years	3,437,580
Due after five years through ten years	24,974
Due after ten years	30,000
Total available for sale (amortized cost)	8,111,893
Mortgage-backed securities available for sale	2,927,073
Investment securities available for sale, amortized cost	11,038,966	$ 11,193,152
Debt securities held to maturity:
Due in one year or less	14,164
Due after one year through five years	1,151,126
Due after five years through ten years	1,306,208
Due after ten years	1,043,889
Total available for held to maturity (amortized cost)	3,515,387
Mortgage-backed securities held to maturity	12,055,733
Amortized cost for held to maturity	15,571,120	13,529,969
Debt securities available for sale:
Due in one year or less	4,544,581
Due after one year through five years	3,306,540
Due after five years through ten years	22,400
Due after ten years	25,132
Total available for sale (fair value)	7,898,653
Mortgage-backed securities available for sale	2,693,756
Total	10,592,409	10,748,961
Debt securities held to maturity:
Due in one year or less	13,967
Due after one year through five years	1,097,310
Due after five years through ten years	1,223,790
Due after ten years	912,465
Total available for held to maturity (fair value)	3,247,532
Mortgage-backed securities held to maturity	10,517,411
Total	$ 13,764,943	$ 12,375,420

Investment Securities - Investm

Investment Securities - Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	$ 555,157	$ 9,670,043
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	22,335	377,333
Estimated fair value, 12 months or more	10,031,278	943,530
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	424,376	67,373
Held to maturity, Estimated fair value, Less than 12 months	3,872,293	10,559,073
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	260,717	885,190
Held to maturity, Estimated fair value, 12 months or more	9,877,015	1,354,961
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	1,554,501	279,647
Total investment securities, fair value less than 12 months	4,427,450	20,229,116
Investment Securities Continuous Unrealized Loss Position Less Than Twelve Months Aggregate Losses	283,052	1,262,523
Total of investment securities, fair value, 12 Months or More	19,908,293	2,298,491
Investment Securities Continuous Unrealized Loss Position Twelve Months or Longer Aggregate Losses	1,978,877	347,020
U.S. Treasury and Federal Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	226,045	6,706,413
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	3,741	183,760
Estimated fair value, 12 months or more	7,509,062	841,945
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	196,810	59,412
Held to maturity, Estimated fair value, Less than 12 months	48,825	1,008,288
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	1,193	45,747
Held to maturity, Estimated fair value, 12 months or more	904,460
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	47,513
Commercial [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	81,949	574,299
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	5,146	20,480
Estimated fair value, 12 months or more	443,520
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	13,648
Held to maturity, Estimated fair value, Less than 12 months	1,015,480	808,903
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	97,998	103,528
Held to maturity, Estimated fair value, 12 months or more	782,997
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	135,057
Residential [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	240,610	2,295,873
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	13,246	169,489
Estimated fair value, 12 months or more	1,926,504	28,305
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	201,285	1,792
Held to maturity, Estimated fair value, Less than 12 months	2,570,788	6,292,462
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	146,021	619,403
Held to maturity, Estimated fair value, 12 months or more	6,102,160	1,319,300
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	1,160,913	271,660
Obligations of States and Political Subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Held to maturity, Estimated fair value, Less than 12 months	235,273	2,449,420
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	15,423	116,512
Held to maturity, Estimated fair value, 12 months or more	2,055,317
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	203,726
Other Debt Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Estimated fair value, Less than 12 months	6,553	93,458
Available For Sale Securities Continuous Unrealized Losses Position Less Than Twelve Months Aggregate Losses	202	3,604
Estimated fair value, 12 months or more	152,192	73,280
Available For Sale Securities Continuous Unrealized Loss Position Twelve Months Or More Aggregate Losses	12,633	6,169
Privately Issued [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Held to maturity, Estimated fair value, Less than 12 months	1,927
Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Aggregate Losses	82
Held to maturity, Estimated fair value, 12 months or more	32,081	35,661
Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Aggregate Losses	$ 7,292	$ 7,987

Loans and Leases and the Allo_3

Loans and Leases and the Allowance for Credit Losses - Summary of Current, Past Due and Nonaccrual Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$ 1,748,497	$ 1,779,054
Accruing Loans Past Due 90 Days or More	354,029	491,018
Nonaccrual	2,341,938	2,438,435
Loans and leases, net of unearned discount	132,354,685	131,564,163
Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	127,910,221	126,855,656
Commercial, Financial, Leasing, etc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	252,987	448,462
Accruing Loans Past Due 90 Days or More	21,064	72,502
Nonaccrual	485,420	347,204
Loans and leases, net of unearned discount	45,058,033	41,850,566
Commercial, Financial, Leasing, etc. [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	44,298,562	40,982,398
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	424,005	311,188
Accruing Loans Past Due 90 Days or More	65,426	67,696
Nonaccrual	1,236,087	1,396,662
Loans and leases, net of unearned discount	35,743,775	36,748,173
Commercial [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	34,018,257	34,972,627
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	6,786	8,703
Nonaccrual	3,353	1,229
Loans and leases, net of unearned discount	1,100,494	1,314,730
Residential Builder and Developer [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,090,355	1,304,798
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	221,532	239,521
Accruing Loans Past Due 90 Days or More		549
Nonaccrual	136,004	124,937
Loans and leases, net of unearned discount	6,729,329	7,301,668
Other Commercial Construction [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,371,793	6,936,661
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	645,696	595,897
Accruing Loans Past Due 90 Days or More	261,290	345,402
Nonaccrual	240,753	272,090
Loans and leases, net of unearned discount	22,490,285	22,704,895
Residential [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	21,342,546	21,491,506
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	29,747	22,456
Nonaccrual	62,250	77,814
Loans and leases, net of unearned discount	957,985	1,051,052
Residential Limited Documentation [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	865,988	950,782
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	36,014	30,787
Nonaccrual	78,316	84,788
Loans and leases, net of unearned discount	4,692,711	5,006,886
Home Equity Lines and Loans [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,578,381	4,891,311
Recreational Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	67,149	54,593
Nonaccrual	30,524	44,630
Loans and leases, net of unearned discount	9,546,131	9,073,394
Recreational Finance [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	9,448,458	8,974,171
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	46,257	44,486
Nonaccrual	15,959	39,584
Loans and leases, net of unearned discount	3,917,794	4,477,276
Automobile [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	3,855,578	4,393,206
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	18,324	22,961
Accruing Loans Past Due 90 Days or More	6,249	4,869
Nonaccrual	53,272	49,497
Loans and leases, net of unearned discount	2,118,148	2,035,523
Other [Member] \| Current [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,040,303	$ 1,958,196

Loans and Leases and the Allo_4

Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Loans And Leases Receivable [Line Items]
Amount of foreclosed residential real estate property held	$ 37	$ 37	$ 41
Loans secured by residential real estate that were in the process of foreclosure	$ 182	$ 182	201
Percentage loans in the process of foreclosure, serviced by other entities, classified as government guaranteed	35%	35%
Minimum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period		90 days
Maximum [Member]
Loans And Leases Receivable [Line Items]
Loan delinquent period		150 days
Commercial Real Estate [Member] \| Asset Pledged as Collateral without Right [Member]
Loans And Leases Receivable [Line Items]
Loans pledged to secure outstanding borrowings	$ 16,300	$ 16,300
Commercial Real Estate [Member] \| Asset Pledged as Collateral without Right [Member] \| FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments			16,300
Residential Mortgage Loans [Member] \| Asset Pledged as Collateral without Right [Member]
Loans And Leases Receivable [Line Items]
Loans pledged to secure outstanding borrowings	16,900	16,900
Residential Mortgage Loans [Member] \| Asset Pledged as Collateral without Right [Member] \| FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments			19,500
Residential Mortgage Loans [Member] \| One-to-Four Family Residential [Member]
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	205	205	32
Commercial Real Estate Loans [Member] \| One-to-Four Family Residential [Member]
Loans And Leases Receivable [Line Items]
Mortgage loans held for sale	226	226	131
Commercial Loans and Leases [Member] \| Asset Pledged as Collateral without Right [Member]
Loans And Leases Receivable [Line Items]
Loans pledged to secure outstanding borrowings	13,100	13,100
Commercial Loans and Leases [Member] \| Asset Pledged as Collateral without Right [Member] \| FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments			10,500
Home Equity Loans and Lines of Credit [Member] \| Asset Pledged as Collateral without Right [Member]
Loans And Leases Receivable [Line Items]
Loans pledged to secure outstanding borrowings	2,600	2,600
Home Equity Loans and Lines of Credit [Member] \| Asset Pledged as Collateral without Right [Member] \| FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments			2,400
Other Consumer Loans [Member] \| Asset Pledged as Collateral without Right [Member]
Loans And Leases Receivable [Line Items]
Loans pledged to secure outstanding borrowings	$ 10,800	$ 10,800
Other Consumer Loans [Member] \| Asset Pledged as Collateral without Right [Member] \| FHLBs Facility [Member]
Loans And Leases Receivable [Line Items]
Pledged financial instruments			$ 10,700
Commercial Loans [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	1 year 1 month 6 days	1 year
Commercial Real Estate Loans [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	1 year 3 months 18 days	1 year 2 months 12 days
Commercial Loans and Commercial Real Estate [Member] \| Minimum [Member]
Loans And Leases Receivable [Line Items]
Amount of real estate loan as reported as accruing or nonaccruing	$ 5	$ 5
Residential Real Estate Loans [Member]
Loans And Leases Receivable [Line Items]
Weighted-average remaining term	11 years 6 months	10 years 1 month 6 days

Loans and Leases and the Allo_5

Loans and Leases and the Allowance for Credit Losses - Summary of Loan grades applied various classes of Commercial and Real Estate Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 132,354,685	$ 132,354,685	$ 131,564,163
Gross charge-offs	122,128	379,291
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27,515,555	27,515,555	26,197,545
Gross charge-offs	15,911	19,852
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,626,606	1,626,606	1,664,096
Gross charge-offs	1,522	3,339
Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13,605,150	13,605,150
Gross charge-offs	9,577	17,479
Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,386,601	22,386,601	24,853,925
Gross charge-offs	15,404	46,324
Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16,333,780	16,333,780	18,747,757
Gross charge-offs	8,983	32,292
Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,118,156	11,118,156	13,072,920
Gross charge-offs	5,091	22,500
Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,677,789	10,677,789	12,737,602
Gross charge-offs	8,346	99,469
Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			7,534,367
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,091,048	29,091,048	26,755,951
Gross charge-offs	57,294	138,036
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	45,058,033	45,058,033	41,850,566
Gross charge-offs	26,844	67,104
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21,988,527	21,988,527	20,313,716
Gross charge-offs	6,188	6,961
Commercial, Financial, Leasing, etc. [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	92,565	92,565	64,599
Commercial, Financial, Leasing, etc. [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	42,593,485	42,593,485	39,621,772
Commercial, Financial, Leasing, etc. [Member] \| Pass [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,869,512	20,869,512	19,444,247
Commercial, Financial, Leasing, etc. [Member] \| Pass [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	56,263	56,263	40,471
Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,979,128	1,979,128	1,881,590
Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	878,730	878,730	768,497
Commercial, Financial, Leasing, etc. [Member] \| Criticized Accrual [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	26,255	26,255	17,026
Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	485,420	485,420	347,204
Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	240,285	240,285	100,972
Commercial, Financial, Leasing, etc. [Member] \| Criticized Nonaccrual [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,047	10,047	7,102
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,911,250	5,911,250
Gross charge-offs	2,124	2,959
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2023 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,789,909	5,789,909
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2023 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	109,004	109,004
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2023 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	12,337	12,337
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,339,736	7,339,736	8,841,135
Gross charge-offs	7,929	18,887
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2022 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,017,863	7,017,863	8,575,130
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2022 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	264,016	264,016	247,626
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2022 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	57,857	57,857	18,379
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,337,440	4,337,440	5,227,686
Gross charge-offs	2,998	11,108
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2021 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,114,909	4,114,909	4,952,758
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2021 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	180,450	180,450	222,861
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2021 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	42,081	42,081	52,067
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,657,961	1,657,961	2,252,579
Gross charge-offs	1,766	8,518
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2020 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,510,693	1,510,693	2,024,603
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2020 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	113,930	113,930	190,368
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2020 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	33,338	33,338	37,608
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,359,582	1,359,582	1,949,169
Gross charge-offs	2,539	7,056
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2019 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,238,701	1,238,701	1,796,047
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2019 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	99,434	99,434	116,881
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2019 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	21,447	21,447	36,241
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			924,743
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2018 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			817,569
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2018 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			71,485
Commercial, Financial, Leasing, etc. [Member] \| Term Loans 2018 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			35,689
Commercial, Financial, Leasing, etc. [Member] \| Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,370,972	2,370,972	2,276,939
Gross charge-offs	3,300	11,615
Commercial, Financial, Leasing, etc. [Member] \| Term Loans Prior Period [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,995,635	1,995,635	1,970,947
Commercial, Financial, Leasing, etc. [Member] \| Term Loans Prior Period [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	307,309	307,309	246,846
Commercial, Financial, Leasing, etc. [Member] \| Term Loans Prior Period [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	68,028	68,028	59,146
Commercial [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	35,743,775	35,743,775	36,748,173
Gross charge-offs	48,093	178,334
Commercial [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	757,640	757,640	941,189
Commercial [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,464,493	29,464,493	30,531,762
Commercial [Member] \| Pass [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	710,648	710,648	869,981
Commercial [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,043,195	5,043,195	4,819,749
Commercial [Member] \| Criticized Accrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,844	22,844	48,099
Commercial [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,236,087	1,236,087	1,396,662
Commercial [Member] \| Criticized Nonaccrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	24,148	24,148	23,109
Commercial [Member] \| Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,554,424	2,554,424
Commercial [Member] \| Term Loans 2023 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,553,454	2,553,454
Commercial [Member] \| Term Loans 2023 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	725	725
Commercial [Member] \| Term Loans 2023 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	245	245
Commercial [Member] \| Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,263,131	4,263,131	4,473,083
Commercial [Member] \| Term Loans 2022 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,578,095	3,578,095	4,136,890
Commercial [Member] \| Term Loans 2022 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	630,132	630,132	324,652
Commercial [Member] \| Term Loans 2022 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	54,904	54,904	11,541
Commercial [Member] \| Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,482,199	3,482,199	3,865,843
Commercial [Member] \| Term Loans 2021 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,989,307	2,989,307	3,379,900
Commercial [Member] \| Term Loans 2021 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	478,637	478,637	463,484
Commercial [Member] \| Term Loans 2021 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	14,255	14,255	22,459
Commercial [Member] \| Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,633,105	3,633,105	4,040,133
Gross charge-offs		424
Commercial [Member] \| Term Loans 2020 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,978,906	2,978,906	3,388,590
Commercial [Member] \| Term Loans 2020 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	494,243	494,243	467,557
Commercial [Member] \| Term Loans 2020 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	159,956	159,956	183,986
Commercial [Member] \| Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	5,502,711	5,502,711	5,542,410
Gross charge-offs		77,906
Commercial [Member] \| Term Loans 2019 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,446,005	4,446,005	4,557,065
Commercial [Member] \| Term Loans 2019 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	905,654	905,654	688,239
Commercial [Member] \| Term Loans 2019 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	151,052	151,052	297,106
Commercial [Member] \| Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			4,401,183
Commercial [Member] \| Term Loans 2018 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			3,293,380
Commercial [Member] \| Term Loans 2018 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			937,421
Commercial [Member] \| Term Loans 2018 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			170,382
Commercial [Member] \| Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	15,550,565	15,550,565	13,484,332
Gross charge-offs	48,093	100,004
Commercial [Member] \| Term Loans Prior Period [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	12,208,078	12,208,078	10,905,956
Commercial [Member] \| Term Loans Prior Period [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,510,960	2,510,960	1,890,297
Commercial [Member] \| Term Loans Prior Period [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	831,527	831,527	688,079
Residential Builder and Developer [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,100,494	1,100,494	1,314,730
Gross charge-offs	245	1,978
Residential Builder and Developer [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	134,502	134,502	181,219
Gross charge-offs		1,678
Residential Builder and Developer [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	994,461	994,461	1,117,256
Residential Builder and Developer [Member] \| Pass [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	133,839	133,839	150,404
Residential Builder and Developer [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	102,680	102,680	196,245
Residential Builder and Developer [Member] \| Criticized Accrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	663	663	30,815
Residential Builder and Developer [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	3,353	3,353	1,229
Residential Builder and Developer [Member] \| Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	433,648	433,648
Residential Builder and Developer [Member] \| Term Loans 2023 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	433,338	433,338
Residential Builder and Developer [Member] \| Term Loans 2023 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	310	310
Residential Builder and Developer [Member] \| Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	349,547	349,547	683,731
Gross charge-offs	245	245
Residential Builder and Developer [Member] \| Term Loans 2022 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	337,680	337,680	680,705
Residential Builder and Developer [Member] \| Term Loans 2022 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,867	11,867	2,969
Residential Builder and Developer [Member] \| Term Loans 2022 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			57
Residential Builder and Developer [Member] \| Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	95,447	95,447	259,205
Residential Builder and Developer [Member] \| Term Loans 2021 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	67,233	67,233	230,079
Residential Builder and Developer [Member] \| Term Loans 2021 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	25,379	25,379	28,472
Residential Builder and Developer [Member] \| Term Loans 2021 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,835	2,835	654
Residential Builder and Developer [Member] \| Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,818	6,818	21,232
Residential Builder and Developer [Member] \| Term Loans 2020 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,818	6,818	11,280
Residential Builder and Developer [Member] \| Term Loans 2020 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			9,952
Residential Builder and Developer [Member] \| Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	66,693	66,693	131,597
Residential Builder and Developer [Member] \| Term Loans 2019 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,050	2,050	22,111
Residential Builder and Developer [Member] \| Term Loans 2019 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	64,125	64,125	108,968
Residential Builder and Developer [Member] \| Term Loans 2019 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	518	518	518
Residential Builder and Developer [Member] \| Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			27,881
Residential Builder and Developer [Member] \| Term Loans 2018 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			12,812
Residential Builder and Developer [Member] \| Term Loans 2018 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			15,069
Residential Builder and Developer [Member] \| Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13,839	13,839	9,865
Gross charge-offs		55
Residential Builder and Developer [Member] \| Term Loans Prior Period [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13,503	13,503	9,865
Residential Builder and Developer [Member] \| Term Loans Prior Period [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	336	336
Other Commercial Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	6,729,329	6,729,329	7,301,668
Gross charge-offs	3,236	3,236
Other Commercial Construction [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	23,129	23,129	18,001
Other Commercial Construction [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	4,508,838	4,508,838	5,204,061
Other Commercial Construction [Member] \| Pass [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	20,171	20,171	15,575
Other Commercial Construction [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,084,487	2,084,487	1,972,670
Other Commercial Construction [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	136,004	136,004	124,937
Other Commercial Construction [Member] \| Criticized Nonaccrual [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	2,958	2,958	2,426
Other Commercial Construction [Member] \| Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	643,494	643,494
Other Commercial Construction [Member] \| Term Loans 2023 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	636,314	636,314
Other Commercial Construction [Member] \| Term Loans 2023 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	7,180	7,180
Other Commercial Construction [Member] \| Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,612,619	1,612,619	1,070,667
Other Commercial Construction [Member] \| Term Loans 2022 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,481,975	1,481,975	1,032,774
Other Commercial Construction [Member] \| Term Loans 2022 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	130,644	130,644	37,893
Other Commercial Construction [Member] \| Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,218,228	1,218,228	1,235,332
Other Commercial Construction [Member] \| Term Loans 2021 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,023,831	1,023,831	1,080,141
Other Commercial Construction [Member] \| Term Loans 2021 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	184,379	184,379	145,199
Other Commercial Construction [Member] \| Term Loans 2021 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,018	10,018	9,992
Other Commercial Construction [Member] \| Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,254,377	1,254,377	1,590,345
Other Commercial Construction [Member] \| Term Loans 2020 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	676,613	676,613	1,225,845
Other Commercial Construction [Member] \| Term Loans 2020 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	531,138	531,138	320,463
Other Commercial Construction [Member] \| Term Loans 2020 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	46,626	46,626	44,037
Other Commercial Construction [Member] \| Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,353,034	1,353,034	2,246,897
Gross charge-offs	3,236	3,236
Other Commercial Construction [Member] \| Term Loans 2019 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	465,423	465,423	1,185,685
Other Commercial Construction [Member] \| Term Loans 2019 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	837,446	837,446	1,025,371
Other Commercial Construction [Member] \| Term Loans 2019 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	50,165	50,165	35,841
Other Commercial Construction [Member] \| Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			676,578
Other Commercial Construction [Member] \| Term Loans 2018 [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			366,686
Other Commercial Construction [Member] \| Term Loans 2018 [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			299,350
Other Commercial Construction [Member] \| Term Loans 2018 [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			10,542
Other Commercial Construction [Member] \| Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	624,448	624,448	463,848
Other Commercial Construction [Member] \| Term Loans Prior Period [Member] \| Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	204,511	204,511	297,355
Other Commercial Construction [Member] \| Term Loans Prior Period [Member] \| Criticized Accrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	393,700	393,700	144,394
Other Commercial Construction [Member] \| Term Loans Prior Period [Member] \| Criticized Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	$ 26,237	$ 26,237	$ 22,099

Loans and Leases and the Allo_6

Loans and Leases and the Allowance for Credit Losses - Summary of loans in Accrual and Nonaccrual Status (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	$ 1,748,497	$ 1,748,497	$ 1,779,054
Accruing Loans Past Due 90 Days or More	354,029	354,029	491,018
Nonaccrual	2,341,938	2,341,938	2,438,435
Loans and leases, net of unearned discount	132,354,685	132,354,685	131,564,163
Gross charge-offs	122,128	379,291
Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27,515,555	27,515,555	26,197,545
Gross charge-offs	15,911	19,852
Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	1,626,606	1,626,606	1,664,096
Gross charge-offs	1,522	3,339
Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	645,696	645,696	595,897
Accruing Loans Past Due 90 Days or More	261,290	261,290	345,402
Nonaccrual	240,753	240,753	272,090
Loans and leases, net of unearned discount	22,490,285	22,490,285	22,704,895
Gross charge-offs	279	2,689
Residential [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1,057	1,057	499
Nonaccrual	7,463	7,463	7,353
Loans and leases, net of unearned discount	91,184	91,184	38,292
Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	29,747	29,747	22,456
Nonaccrual	62,250	62,250	77,814
Loans and leases, net of unearned discount	957,985	957,985	1,051,052
Gross charge-offs	1,053	1,416
Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	36,014	36,014	30,787
Nonaccrual	78,316	78,316	84,788
Loans and leases, net of unearned discount	4,692,711	4,692,711	5,006,886
Gross charge-offs	1,522	4,721
Home Equity Lines and Loans [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual	1,158	1,158	2,799
Loans and leases, net of unearned discount	3,033,626	3,033,626	3,265,332
Gross charge-offs		1,298
Home Equity Lines and Loans [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	33,534	33,534	28,460
Nonaccrual	71,021	71,021	74,646
Loans and leases, net of unearned discount	1,529,744	1,529,744	1,590,440
Gross charge-offs	1,522	3,339
Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	67,149	67,149	54,593
Nonaccrual	30,524	30,524	44,630
Loans and leases, net of unearned discount	9,546,131	9,546,131	9,073,394
Gross charge-offs	16,073	45,374
Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	46,257	46,257	44,486
Nonaccrual	15,959	15,959	39,584
Loans and leases, net of unearned discount	3,917,794	3,917,794	4,477,276
Gross charge-offs	4,988	16,630
Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	18,324	18,324	22,961
Accruing Loans Past Due 90 Days or More	6,249	6,249	4,869
Nonaccrual	53,272	53,272	49,497
Loans and leases, net of unearned discount	2,118,148	2,118,148	2,035,523
Gross charge-offs	19,795	57,809
Other [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	10,337	10,337	15,655
Accruing Loans Past Due 90 Days or More	6,041	6,041	4,643
Nonaccrual	49,408	49,408	44,449
Loans and leases, net of unearned discount	1,486,947	1,486,947	1,439,796
Gross charge-offs	9,723	9,915
Other [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	912	912	651
Nonaccrual	204	204	185
Loans and leases, net of unearned discount	4,297	4,297	9,057
Current [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	127,910,221	127,910,221	126,855,656
Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	21,342,546	21,342,546	21,491,506
Current [Member] \| Residential [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	82,664	82,664	30,440
Current [Member] \| Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	865,988	865,988	950,782
Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,578,381	4,578,381	4,891,311
Current [Member] \| Home Equity Lines and Loans [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,032,468	3,032,468	3,262,533
Current [Member] \| Home Equity Lines and Loans [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,425,189	1,425,189	1,487,334
Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	9,448,458	9,448,458	8,974,171
Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,855,578	3,855,578	4,393,206
Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,040,303	2,040,303	1,958,196
Current [Member] \| Other [Member] \| Revolving Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,421,161	1,421,161	1,375,049
Current [Member] \| Other [Member] \| Revolving Loans Converted to Term Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,181	3,181	8,221
Term Loans 2023 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	13,605,150	13,605,150
Gross charge-offs	9,577	17,479
Term Loans 2023 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	8,385	8,385
Accruing Loans Past Due 90 Days or More	913	913
Nonaccrual	971	971
Loans and leases, net of unearned discount	1,359,874	1,359,874
Term Loans 2023 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	75	75
Term Loans 2023 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	5,564	5,564
Nonaccrual	1,138	1,138
Loans and leases, net of unearned discount	1,831,200	1,831,200
Gross charge-offs	1,261	2,134
Term Loans 2023 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	3,019	3,019
Nonaccrual	1,148	1,148
Loans and leases, net of unearned discount	657,337	657,337
Gross charge-offs	476	557
Term Loans 2023 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	2,592	2,592
Nonaccrual	1,805	1,805
Loans and leases, net of unearned discount	213,848	213,848
Gross charge-offs	5,716	11,829
Term Loans 2023 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,349,605	1,349,605
Term Loans 2023 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	75	75
Term Loans 2023 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,824,498	1,824,498
Term Loans 2023 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	653,170	653,170
Term Loans 2023 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	209,451	209,451
Term Loans 2022 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	22,386,601	22,386,601	24,853,925
Gross charge-offs	15,404	46,324
Term Loans 2022 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	87,178	87,178	59,477
Accruing Loans Past Due 90 Days or More	27,348	27,348	12,012
Nonaccrual	14,353	14,353	5,686
Loans and leases, net of unearned discount	4,956,214	4,956,214	5,148,554
Gross charge-offs	31	164
Term Loans 2022 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	27	27	930
Term Loans 2022 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	11,669	11,669	8,648
Nonaccrual	3,935	3,935	3,533
Loans and leases, net of unearned discount	2,454,529	2,454,529	2,854,272
Gross charge-offs	3,415	8,565
Term Loans 2022 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	12,198	12,198	6,926
Nonaccrual	2,679	2,679	2,493
Loans and leases, net of unearned discount	1,207,687	1,207,687	1,500,495
Gross charge-offs	1,584	4,403
Term Loans 2022 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	2,055	2,055	3,783
Nonaccrual	852	852	2,745
Loans and leases, net of unearned discount	203,111	203,111	281,058
Gross charge-offs	2,200	14,060
Term Loans 2022 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	4,827,335	4,827,335	5,071,379
Term Loans 2022 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	27	27	930
Term Loans 2022 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,438,925	2,438,925	2,842,091
Term Loans 2022 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,192,810	1,192,810	1,491,076
Term Loans 2022 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	200,204	200,204	274,530
Term Loans 2021 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	16,333,780	16,333,780	18,747,757
Gross charge-offs	8,983	32,292
Term Loans 2021 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	68,811	68,811	51,308
Accruing Loans Past Due 90 Days or More	19,355	19,355	39,934
Nonaccrual	13,730	13,730	10,865
Loans and leases, net of unearned discount	3,919,548	3,919,548	4,103,759
Gross charge-offs		192
Term Loans 2021 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Nonaccrual	19	19	15
Loans and leases, net of unearned discount	1,937	1,937	2,124
Term Loans 2021 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	15,168	15,168	9,525
Nonaccrual	6,338	6,338	7,440
Loans and leases, net of unearned discount	1,966,332	1,966,332	2,297,592
Gross charge-offs	3,475	9,502
Term Loans 2021 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	13,492	13,492	13,324
Nonaccrual	4,632	4,632	10,698
Loans and leases, net of unearned discount	1,182,198	1,182,198	1,581,698
Gross charge-offs	1,288	5,272
Term Loans 2021 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	1,546	1,546	1,450
Nonaccrual	430	430	830
Loans and leases, net of unearned discount	130,451	130,451	174,518
Gross charge-offs	1,222	6,218
Term Loans 2021 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	3,817,652	3,817,652	4,001,652
Term Loans 2021 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,918	1,918	2,109
Term Loans 2021 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,944,826	1,944,826	2,280,627
Term Loans 2021 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,164,074	1,164,074	1,557,676
Term Loans 2021 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	128,475	128,475	172,238
Term Loans 2020 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	11,118,156	11,118,156	13,072,920
Gross charge-offs	5,091	22,500
Term Loans 2020 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	41,367	41,367	40,337
Accruing Loans Past Due 90 Days or More	13,736	13,736	20,067
Nonaccrual	3,500	3,500	2,583
Loans and leases, net of unearned discount	2,664,017	2,664,017	2,780,358
Gross charge-offs		21
Term Loans 2020 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	144	144
Loans and leases, net of unearned discount	2,018	2,018	2,441
Term Loans 2020 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	12,145	12,145	12,412
Nonaccrual	5,477	5,477	9,427
Loans and leases, net of unearned discount	1,362,545	1,362,545	1,609,468
Gross charge-offs	2,377	8,108
Term Loans 2020 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	6,866	6,866	7,284
Nonaccrual	2,525	2,525	7,372
Loans and leases, net of unearned discount	498,650	498,650	717,367
Gross charge-offs	625	2,502
Term Loans 2020 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	314	314	326
Nonaccrual	119	119	332
Loans and leases, net of unearned discount	38,665	38,665	58,997
Gross charge-offs	323	2,927
Term Loans 2020 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	2,605,414	2,605,414	2,717,371
Term Loans 2020 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,874	1,874	2,441
Term Loans 2020 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,344,923	1,344,923	1,587,629
Term Loans 2020 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	489,259	489,259	702,711
Term Loans 2020 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	38,232	38,232	58,339
Term Loans 2019 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	10,677,789	10,677,789	12,737,602
Gross charge-offs	8,346	99,469
Term Loans 2019 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	22,082	22,082	21,849
Accruing Loans Past Due 90 Days or More	13,169	13,169	14,050
Nonaccrual	8,529	8,529	9,860
Loans and leases, net of unearned discount	1,284,318	1,284,318	1,438,625
Gross charge-offs		139
Term Loans 2019 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	232	232	171
Nonaccrual	27	27	536
Loans and leases, net of unearned discount	13,853	13,853	16,068
Term Loans 2019 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	7,973	7,973	8,387
Nonaccrual	4,013	4,013	7,625
Loans and leases, net of unearned discount	832,543	832,543	979,919
Gross charge-offs	1,872	6,035
Term Loans 2019 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	5,582	5,582	7,239
Nonaccrual	2,217	2,217	7,520
Loans and leases, net of unearned discount	244,790	244,790	393,721
Gross charge-offs	436	1,919
Term Loans 2019 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	185	185	386
Nonaccrual	149	149	371
Loans and leases, net of unearned discount	20,265	20,265	39,196
Gross charge-offs	263	3,178
Term Loans 2019 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,240,538	1,240,538	1,392,866
Term Loans 2019 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	13,594	13,594	15,361
Term Loans 2019 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	820,557	820,557	963,907
Term Loans 2019 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	236,991	236,991	378,962
Term Loans 2019 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	19,931	19,931	38,439
Term Loans 2018 [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount			7,534,367
Term Loans 2018 [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due			23,126
Accruing Loans Past Due 90 Days or More			14,007
Nonaccrual			4,650
Loans and leases, net of unearned discount			795,691
Term Loans 2018 [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due			126
Nonaccrual			334
Loans and leases, net of unearned discount			23,781
Term Loans 2018 [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due			5,202
Nonaccrual			5,344
Loans and leases, net of unearned discount			497,510
Term Loans 2018 [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due			5,464
Nonaccrual			5,620
Loans and leases, net of unearned discount			178,522
Term Loans 2018 [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due			141
Nonaccrual			120
Loans and leases, net of unearned discount			8,478
Term Loans 2018 [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans			753,908
Term Loans 2018 [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans			23,321
Term Loans 2018 [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans			486,964
Term Loans 2018 [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans			167,438
Term Loans 2018 [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans			8,217
Term Loans Prior Period [Member]
Financing Receivable Recorded Investment [Line Items]
Loans and leases, net of unearned discount	29,091,048	29,091,048	26,755,951
Gross charge-offs	57,294	138,036
Term Loans Prior Period [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	416,816	416,816	399,301
Accruing Loans Past Due 90 Days or More	186,769	186,769	245,332
Nonaccrual	192,207	192,207	231,093
Loans and leases, net of unearned discount	8,215,130	8,215,130	8,399,616
Gross charge-offs	248	2,173
Term Loans Prior Period [Member] \| Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	29,747	29,747	22,456
Nonaccrual	62,250	62,250	77,814
Loans and leases, net of unearned discount	957,985	957,985	1,051,052
Gross charge-offs	1,053	1,416
Term Loans Prior Period [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	2,104	2,104	2,030
Nonaccrual	6,091	6,091	6,458
Loans and leases, net of unearned discount	111,431	111,431	105,770
Gross charge-offs		84
Term Loans Prior Period [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	14,630	14,630	10,419
Nonaccrual	9,623	9,623	11,261
Loans and leases, net of unearned discount	1,098,982	1,098,982	834,633
Gross charge-offs	3,673	11,030
Term Loans Prior Period [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	5,100	5,100	4,249
Nonaccrual	2,758	2,758	5,881
Loans and leases, net of unearned discount	127,132	127,132	105,473
Gross charge-offs	579	1,977
Term Loans Prior Period [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
30-89 Days Past Due	383	383	569
Accruing Loans Past Due 90 Days or More	208	208	226
Nonaccrual	305	305	465
Loans and leases, net of unearned discount	20,564	20,564	24,423
Gross charge-offs	348	9,682
Term Loans Prior Period [Member] \| Current [Member] \| Residential [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	7,419,338	7,419,338	7,523,890
Term Loans Prior Period [Member] \| Current [Member] \| Residential Limited Documentation [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	865,988	865,988	950,782
Term Loans Prior Period [Member] \| Current [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	103,236	103,236	97,282
Term Loans Prior Period [Member] \| Current [Member] \| Recreational Finance [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	1,074,729	1,074,729	812,953
Term Loans Prior Period [Member] \| Current [Member] \| Automobile [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	119,274	119,274	95,343
Term Loans Prior Period [Member] \| Current [Member] \| Other [Member]
Financing Receivable Recorded Investment [Line Items]
Total loans	$ 19,668	$ 19,668	$ 23,163

Loans and Leases and the Allo_7

Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	$ 1,998,366	$ 1,823,790	$ 1,925,331	$ 1,469,226
Allowance on acquired PCD loans				99,000
Provision for credit losses	150,000	115,000	420,000	427,000
Net charge-offs
Charge-offs	(122,128)	(101,267)	(379,291)	(227,919)
Recoveries	25,889	38,068	86,087	108,284
Net (charge-offs) recoveries	(96,239)	(63,199)	(293,204)	(119,635)
Ending balance	2,052,127	1,875,591	2,052,127	1,875,591
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	511,929	414,473	502,153	283,899
Allowance on acquired PCD loans				41,003
Provision for credit losses	45,637	43,343	69,801	167,985
Net charge-offs
Charge-offs	(26,844)	(37,396)	(67,104)	(94,555)
Recoveries	6,976	22,022	32,848	44,110
Net (charge-offs) recoveries	(19,868)	(15,374)	(34,256)	(50,445)
Ending balance	537,698	442,442	537,698	442,442
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	765,676	708,393	676,684	557,239
Allowance on acquired PCD loans				55,812
Provision for credit losses	73,588	26,949	290,672	116,288
Net charge-offs
Charge-offs	(51,574)	(35,213)	(183,548)	(45,809)
Recoveries	4,290	401	8,172	17,000
Net (charge-offs) recoveries	(47,284)	(34,812)	(175,376)	(28,809)
Ending balance	791,980	700,530	791,980	700,530
Residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	118,392	124,326	115,092	71,726
Allowance on acquired PCD loans				1,833
Provision for credit losses	(3,390)	(11,169)	(955)	40,719
Net charge-offs
Charge-offs	(1,332)	(2,572)	(4,105)	(9,407)
Recoveries	824	2,234	4,462	7,948
Net (charge-offs) recoveries	(508)	(338)	(357)	(1,459)
Ending balance	114,494	112,819	114,494	112,819
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	602,369	576,598	631,402	556,362
Allowance on acquired PCD loans				352
Provision for credit losses	34,165	55,877	60,482	102,008
Net charge-offs
Charge-offs	(42,378)	(26,086)	(124,534)	(78,148)
Recoveries	13,799	13,411	40,605	39,226
Net (charge-offs) recoveries	(28,579)	(12,675)	(83,929)	(38,922)
Ending balance	$ 607,955	$ 619,800	$ 607,955	$ 619,800

Loans and Leases and the Allo_8

Loans and Leases and the Allowance for Credit Losses - Changes in Allowance for Credit Losses (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses		$ 150,000	$ 115,000	$ 420,000	$ 427,000
Charge-offs		$ (122,128)	$ (101,267)	$ (379,291)	(227,919)
Non PCD Acquired Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for credit losses					242,000
PCD Acquired Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Charge-offs	$ (33,000)				$ (33,000)

Loans and Leases and the Allo_9

Loans and Leases and the Allowance for Credit Losses - Loan and Leases Considered Nonaccrual and Interest Income Recognized on Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Jan. 01, 2023	Jun. 30, 2022	Jan. 01, 2022
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	$ 1,038,213	$ 1,005,944	$ 1,038,213	$ 1,005,944
Amortized Cost without Allowance	1,303,725	1,423,382	1,303,725	1,423,382
Total	2,341,938	2,429,326	2,341,938	2,429,326
Amortized Cost					$ 2,435,581	$ 2,438,435	$ 2,633,005	$ 2,060,083
Interest Income Recognized	22,107	21,031	51,644	66,462
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	324,774	207,841	324,774	207,841
Amortized Cost without Allowance	160,646	160,325	160,646	160,325
Total	485,420	368,166	485,420	368,166
Amortized Cost					416,022	347,204	442,496	221,022
Interest Income Recognized	3,726	4,708	7,914	20,423
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	458,720	394,502	458,720	394,502
Amortized Cost without Allowance	777,367	1,011,698	777,367	1,011,698
Total	1,236,087	1,406,200	1,236,087	1,406,200
Amortized Cost					1,383,190	1,396,662	1,476,658	1,069,280
Interest Income Recognized	12,446	7,059	22,379	14,944
Residential Builder and Developer [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	3,353	1,930	3,353	1,930
Total	3,353	1,930	3,353	1,930
Amortized Cost					1,193	1,229	518	3,005
Interest Income Recognized			396	1,687
Other Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	4,080	25,235	4,080	25,235
Amortized Cost without Allowance	131,924	40,952	131,924	40,952
Total	136,004	66,187	136,004	66,187
Amortized Cost					146,024	124,937	73,046	111,405
Interest Income Recognized	249	22	1,974	3,398
Residential [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	90,879	160,704	90,879	160,704
Amortized Cost without Allowance	149,874	124,691	149,874	124,691
Total	240,753	285,395	240,753	285,395
Amortized Cost					238,509	272,090	331,376	355,858
Interest Income Recognized	3,480	8,059	12,247	21,397
Residential Limited Documentation [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	21,634	61,297	21,634	61,297
Amortized Cost without Allowance	40,616	34,085	40,616	34,085
Total	62,250	95,382	62,250	95,382
Amortized Cost					66,614	77,814	112,608	122,888
Interest Income Recognized	426	229	686	456
Home Equity Lines and Loans [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	48,737	38,324	48,737	38,324
Amortized Cost without Allowance	29,579	39,884	29,579	39,884
Total	78,316	78,208	78,316	78,208
Amortized Cost					77,090	84,788	79,445	70,488
Interest Income Recognized	1,493	669	5,172	3,291
Recreational Finance [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	20,955	31,295	20,955	31,295
Amortized Cost without Allowance	9,569	7,423	9,569	7,423
Total	30,524	38,718	30,524	38,718
Amortized Cost					32,286	44,630	33,414	27,811
Interest Income Recognized	185	166	536	488
Automobile [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	11,981	36,075	11,981	36,075
Amortized Cost without Allowance	3,978	4,243	3,978	4,243
Total	15,959	40,318	15,959	40,318
Amortized Cost					21,791	39,584	36,266	34,037
Interest Income Recognized	36	35	107	110
Other [Member]
Financing Receivable, Impaired [Line Items]
Amortized Cost with Allowance	53,100	48,741	53,100	48,741
Amortized Cost without Allowance	172	81	172	81
Total	53,272	48,822	53,272	48,822
Amortized Cost					$ 52,862	$ 49,497	$ 47,178	$ 44,289
Interest Income Recognized	$ 66	$ 84	$ 233	$ 268

Loans and Leases and the All_10

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 592,096	$ 1,198,066
Percent of total loan class at period end	0.45%	0.91%
Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 583,043	$ 1,167,728
Interest Rate Reduction [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		515
Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	9,053	29,823
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 40,262	$ 95,623
Percent of total loan class at period end	0.09%	0.21%
Commercial, Financial, Leasing, etc. [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 39,058	$ 93,583
Commercial, Financial, Leasing, etc. [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		381
Commercial, Financial, Leasing, etc. [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	1,204	1,659
Commercial Real Estate [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 279,454	$ 454,445
Percent of total loan class at period end	0.78%	1.27%
Commercial Real Estate [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 273,201	$ 440,195
Commercial Real Estate [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	6,253	14,250
Residential Builder and Developer [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		$ 70,683
Percent of total loan class at period end		6.42%
Residential Builder and Developer [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		$ 70,683
Other Commercial Construction [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 215,598	$ 439,921
Percent of total loan class at period end	3.20%	6.54%
Other Commercial Construction [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 215,598	$ 431,668
Other Commercial Construction [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		8,253
Residential [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 54,685	$ 125,157
Percent of total loan class at period end	0.24%	0.56%
Residential [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 53,239	$ 120,632
Residential [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	1,446	4,525
Residential Limited Documentation [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 1,721	$ 10,670
Percent of total loan class at period end	0.18%	1.11%
Residential Limited Documentation [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 1,721	$ 9,971
Residential Limited Documentation [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		699
Home Equity Lines and Loans [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 275	$ 1,053
Percent of total loan class at period end	0.01%	0.02%
Home Equity Lines and Loans [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 125	$ 482
Home Equity Lines and Loans [Member] \| Interest Rate Reduction [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring		134
Home Equity Lines and Loans [Member] \| Combination of Modification Types [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	150	437
Recreational Finance [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	40	240
Recreational Finance [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	40	240
Automobile [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	61	$ 274
Percent of total loan class at period end		0.01%
Automobile [Member] \| Payment Deferral [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 61	$ 274

Loans and Leases and the All_11

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities to Borrowers Experiencing Financial Difficulty on Financing Receivables (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 592,096	$ 1,198,066
Guaranteed by Government-Related Entities [Member]
Financing Receivable, Modifications other than Troubled Debt Restructuring [Line Items]
Financing receivable, modifications other than troubled debt restructuring	$ 45,000	$ 92,000

Loans and Leases and the All_12

Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Detail) $ in Thousands	Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	$ 1,114,412
30-89 Days Past Due	55,643
Past Due 90 Days or More	28,011
Total	1,198,066
Commercial, Financial, Leasing, etc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	81,558
30-89 Days Past Due	2,326
Past Due 90 Days or More	11,739
Total	95,623
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	433,428
30-89 Days Past Due	19,022
Past Due 90 Days or More	1,995
Total	454,445
Residential Builder and Developer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	70,683
Total	70,683
Other Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	439,921
Total	439,921
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	79,331
30-89 Days Past Due	33,344
Past Due 90 Days or More	12,482
Total	125,157
Residential Limited Documentation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	7,943
30-89 Days Past Due	932
Past Due 90 Days or More	1,795
Total	10,670
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	1,034
30-89 Days Past Due	19
Total	1,053
Recreational Finance [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	240
Total	240
Automobile [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current	274
Total	$ 274

Loans and Leases and the All_13

Loans and Leases and the Allowance for Credit Losses - Summary of Payment Status of Loans Modified (Parenthetical) (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	$ 55,643
Past Due 90 Days or More	28,011
Guaranteed by Government-Related Entities [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-89 Days Past Due	28,000
Past Due 90 Days or More	$ 11,000

Loans and Leases and the All_14

Loans and Leases and the Allowance for Credit Losses - Loan Modification Activities that were Considered Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($) Modification	Sep. 30, 2022 USD ($) Modification
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	839	2,691
Pre-modification Recorded Investment	$ 88,700	$ 227,509
Loans and leases, net of unearned discount	$ 89,800	$ 231,516
Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	70	147
Pre-modification Recorded Investment	$ 32,451	$ 79,437
Loans and leases, net of unearned discount	$ 33,431	$ 81,371
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	14	44
Pre-modification Recorded Investment	$ 22,951	$ 33,349
Loans and leases, net of unearned discount	$ 22,887	$ 33,003
Residential [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	57	221
Pre-modification Recorded Investment	$ 14,380	$ 56,912
Loans and leases, net of unearned discount	$ 14,564	$ 59,290
Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	2	7
Pre-modification Recorded Investment	$ 155	$ 1,231
Loans and leases, net of unearned discount	$ 155	$ 1,242
Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	25	93
Pre-modification Recorded Investment	$ 1,700	$ 6,483
Loans and leases, net of unearned discount	$ 1,700	$ 6,550
Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	167	514
Pre-modification Recorded Investment	$ 6,937	$ 19,138
Loans and leases, net of unearned discount	$ 6,937	$ 19,131
Automobile [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	474	1,537
Pre-modification Recorded Investment	$ 9,755	$ 29,789
Loans and leases, net of unearned discount	$ 9,755	$ 29,759
Other [Member]
Financing Receivable, Modifications [Line Items]
Number of modifications \| Modification	30	128
Pre-modification Recorded Investment	$ 371	$ 1,170
Loans and leases, net of unearned discount	371	1,170
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	48,275	160,742
Principal Deferral [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	11,237	49,671
Principal Deferral [Member] \| Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	7,222	13,052
Principal Deferral [Member] \| Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	11,094	40,821
Principal Deferral [Member] \| Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	155	1,049
Principal Deferral [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	1,504	6,089
Principal Deferral [Member] \| Recreational Finance [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	6,937	19,131
Principal Deferral [Member] \| Automobile [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	9,755	29,759
Principal Deferral [Member] \| Other [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	371	1,170
Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	446	455
Interest Rate Reduction [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	446	455
Other [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	351	3,206
Other [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	229	983
Other [Member] \| Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	122	2,223
Combination of Concession Types [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	40,728	67,113
Combination of Concession Types [Member] \| Commercial, Financial, Leasing, etc. [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	21,519	30,262
Combination of Concession Types [Member] \| Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	15,543	17,728
Combination of Concession Types [Member] \| Residential [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	3,470	18,469
Combination of Concession Types [Member] \| Residential Limited Documentation [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount		193
Combination of Concession Types [Member] \| Home Equity Lines and Loans [Member]
Financing Receivable, Modifications [Line Items]
Loans and leases, net of unearned discount	$ 196	$ 461

Borrowings - Schedule of Borrow

Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Short-term borrowings
Federal funds purchased and repurchased agreements	$ 530,663	$ 354,670
FHLB Advances	6,200,000	3,200,281
Total short-term borrowings	6,730,663	3,554,951
Long-term borrowings
Asset-backed notes	516,668
FHLB Advances	4,956	5,183
Senior notes	3,741,161	1,249,141
Subordinated notes	857,876	866,296
Other	9,509	9,535
Total long-term borrowings	7,123,426	3,964,537
M&T [Member]
Long-term borrowings
Senior notes	1,377,985	1,220,965
Subordinated notes	76,339	77,337
Junior subordinated debentures	$ 538,932	$ 536,080

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended
	Oct. 31, 2023	Jan. 31, 2023	Sep. 30, 2023	Aug. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Senior notes			$ 3,741,161		$ 1,249,141
Description of variable rate basis		SOFR
Asset-backed notes			516,668
Short-term borrowings			6,730,663		3,554,951
Long-term borrowings			7,123,426		3,964,537
FHLB Advances			4,956		$ 5,183
Subsequent Event [Member]
Debt Instrument [Line Items]
Description of variable rate basis	SOFR
Equipment Finance Loan [Member]
Debt Instrument [Line Items]
Asset-backed notes				$ 550,000
Weighted average interest rate				5.84%
5.053% Fixed Rate Senior Notes Due to Mature in January 2034 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,000,000
Senior notes maturity date		Jan. 31, 2034
Interest rate of debt instrument		5.05%
Variable interest rate of debt instrument		1.85%
4.65% Fixed Rate Senior Notes Due to Mature in January 2026 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,300,000
Senior notes maturity date		Jan. 31, 2026
Interest rate of debt instrument		4.65%
4.70% Fixed Rate Senior Notes Due to Mature in January 2028 [Member]
Debt Instrument [Line Items]
Senior notes		$ 1,200,000
Senior notes maturity date		Jan. 31, 2028
Interest rate of debt instrument		4.70%
7.41% Fixed Rate Senior Notes Due to Mature in October 2029 [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Senior notes	$ 750,000
Senior notes maturity date	Jan. 31, 2034
Interest rate of debt instrument	7.41%
Variable interest rate of debt instrument	2.80%
FHLB of New York [Member]
Debt Instrument [Line Items]
Available line of credit			14,300,000
FRB of New York [Member]
Debt Instrument [Line Items]
Available line of credit			$ 15,800,000

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Detail) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Equity [Abstract]
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value	$ 1	$ 1

Shareholders' Equity - Issued a

Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock, shares issued	10,000,000	10,000,000
Carrying Value	$ 2,010,600	$ 2,010,600

Shareholders' Equity - Issued_2

Shareholders' Equity - Issued and Outstanding Preferred Stock (Parenthetical) (Detail) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock, liquidation preference per share	$ 25	$ 25

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Detail1)	Sep. 30, 2023
Maximum [Member] \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-07-01
Disaggregation Of Revenue [Line Items]
Period of satisfaction of contract with customer	1 year

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Disaggregation Of Revenue [Line Items]
Uncollected amounts receivable	$ 61	$ 74
Accrued interest and other liabilities [Member]
Disaggregation Of Revenue [Line Items]
Deferred revenue	$ 51	$ 48

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Summary of Sources of Noninterest Income that are Subject to Revenue Recognition Accounting Guidance (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Brokerage services income	$ 26,988	$ 21,086	$ 76,155	$ 65,414
Other revenues from operations:
Total other income	559,581	563,079	1,949,885	1,675,066
Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	121,360	115,213	353,603	340,890
Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	155,092	186,577	521,357	545,874
ASU 2014-09 [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	26,988	21,086	76,155	65,414
Other revenues from operations:
Merchant discount and credit card fees	42,841	42,504	122,005	117,108
Other	15,289	26,048	46,229	77,317
Total other income	361,570	391,428	1,119,349	1,146,603
ASU 2014-09 [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	121,360	115,213	353,603	340,890
ASU 2014-09 [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	155,092	186,577	521,357	545,874
ASU 2014-09 [Member] \| Business Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	17,021	16,234	48,206	45,874
Total other income	38,793	35,511	110,355	99,455
ASU 2014-09 [Member] \| Business Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	21,749	19,277	62,097	53,581
ASU 2014-09 [Member] \| Business Banking [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	23		52
ASU 2014-09 [Member] \| Commercial Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	19,494	17,731	53,056	48,044
Other	5,839	9,878	16,441	13,040
Total other income	56,570	58,015	159,437	146,890
ASU 2014-09 [Member] \| Commercial Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	31,237	30,406	89,940	85,806
ASU 2014-09 [Member] \| Commercial Real Estate [Member]
Other revenues from operations:
Merchant discount and credit card fees	1,171	1,104	3,406	2,836
Other	942	1,961	3,460	8,228
Total other income	6,664	6,748	20,029	21,967
ASU 2014-09 [Member] \| Commercial Real Estate [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	4,551	3,683	13,163	10,903
ASU 2014-09 [Member] \| Discretionary Portfolio [Member]
Other revenues from operations:
Other	13	904	51	2,468
Total other income	13	904	51	2,468
ASU 2014-09 [Member] \| Residential Mortgage Banking [Member]
Other revenues from operations:
Other	125	558	676	3,413
Total other income	125	558	676	3,413
ASU 2014-09 [Member] \| Retail Banking [Member]
Other revenues from operations:
Merchant discount and credit card fees	4,795	6,874	16,345	19,408
Other	7,605	3,980	22,679	16,752
Total other income	74,411	72,077	222,165	222,150
ASU 2014-09 [Member] \| Retail Banking [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	62,011	61,223	183,141	185,990
ASU 2014-09 [Member] \| All Other [Member]
Disaggregation Of Revenue [Line Items]
Brokerage services income	26,988	21,086	76,155	65,414
Other revenues from operations:
Merchant discount and credit card fees	360	561	992	946
Other	765	8,767	2,922	33,416
Total other income	184,994	217,615	606,636	650,260
ASU 2014-09 [Member] \| All Other [Member] \| Service Charges on Deposit Accounts [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	1,812	624	5,262	4,610
ASU 2014-09 [Member] \| All Other [Member] \| Trust Income [Member]
Disaggregation Of Revenue [Line Items]
Revenue from contract with customer	$ 155,069	$ 186,577	$ 521,305	$ 545,874

Pension Plans and Other Postr_3

Pension Plans and Other Postretirement Benefits - Net Periodic Defined Benefit Cost for Defined Benefit Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2,837	$ 4,423	$ 8,512	$ 13,237
Interest cost on projected benefit obligation	28,862	22,060	86,585	60,407
Expected return on plan assets	(50,315)	(50,188)	(150,945)	(137,421)
Amortization of prior service cost (credit)	52	129	155	387
Amortization of net actuarial loss (gain)	(537)	4,974	(1,610)	14,921
Net periodic cost (benefit)	$ (19,101)	$ (18,602)	$ (57,303)	$ (48,469)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 400	$ 689	$ 1,200	$ 1,914
Interest cost on projected benefit obligation	703	581	2,109	1,607
Amortization of prior service cost (credit)	(515)	(693)	(1,545)	(2,079)
Amortization of net actuarial loss (gain)	(692)	(370)	(2,076)	(1,111)
Net periodic cost (benefit)	$ (104)	$ 207	$ (312)	$ 331
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense

Pension Plans and Other Postr_4

Pension Plans and Other Postretirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Retirement Benefits [Abstract]
Defined contribution pension and retirement savings plans total expense	$ 37	$ 32	$ 118	$ 98

Earnings Per Common Share - Com

Earnings Per Common Share - Computations of Basic Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income available to common shareholders:
Net Income (Loss)	$ 689,941	$ 646,596	$ 2,258,599	$ 1,226,292
Less: Preferred stock dividends	(24,941)	(24,941)	(74,822)	(71,647)
Net income available to common equity	665,000	621,655	2,183,777	1,154,645
Less: Income attributable to unvested stock-based compensation awards	(1,237)	(1,106)	(3,975)	(2,245)
Net income available to common shareholders	$ 663,763	$ 620,549	$ 2,179,802	$ 1,152,400
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,217	174,921	166,787	160,793
Less: Unvested stock-based compensation awards	(308)	(312)	(299)	(319)
Weighted-average shares outstanding	165,909	174,609	166,488	160,474
Basic earnings per common share	$ 4	$ 3.55	$ 13.09	$ 7.18

Earnings Per Common Share - C_2

Earnings Per Common Share - Computations of Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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 available to common equity	$ 665,000	$ 621,655	$ 2,183,777	$ 1,154,645
Less: Income attributable to unvested stock-based compensation awards	(1,234)	(1,101)	(3,965)	(2,239)
Net income available to common shareholders	$ 663,766	$ 620,554	$ 2,179,812	$ 1,152,406
Adjusted weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards	166,217	174,921	166,787	160,793
Less: Unvested stock-based compensation awards	(308)	(312)	(299)	(319)
Plus: Incremental shares from assumed conversion of stock-based compensation awards	661	1,073	605	821
Adjusted weighted-average shares outstanding	166,570	175,682	167,093	161,295
Diluted earnings per common share	$ 3.98	$ 3.53	$ 13.05	$ 7.14

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	1,745,348	252,793	1,800,385	314,155

Comprehensive Income - Componen

Comprehensive Income - Components of Other Comprehensive Income (Loss) and Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			$ (1,066,177)	$ (172,054)
Unrealized holding losses, net, before tax			(2,366)	(576,266)
Foreign currency translation adjustment, before tax			71	(14,564)
Unrealized losses on cash flow hedges			(365,739)	(429,310)
Total other comprehensive income (loss) before reclassifications, before tax			(368,034)	(1,020,140)
Amortization of unrealized holding losses on held-to-maturity securities				1,766
Accretion of net gain on terminated cash flow hedges, before tax			(91)	(90)
Net yield adjustment from cash flow hedges currently in effect, before tax			173,051	(35,500)
Amortization of prior service credit, before tax			(1,390)	(1,692)
Amortization of actuarial gains (losses), before tax			(3,686)	13,810
Total other comprehensive income (loss), before tax			(200,150)	(1,041,846)
Ending balance, before tax	$ (1,266,327)	$ (1,213,900)	(1,266,327)	(1,213,900)
Beginning balance, tax			276,147	44,476
Unrealized holding losses, net, tax			(588)	149,186
Foreign currency translation adjustment, tax			(18)	3,293
Unrealized losses on cash flow hedges, tax			90,679	111,150
Total other comprehensive income (loss) before reclassifications, tax			91,249	263,629
Amortization of unrealized holding losses on held-to-maturity securities, tax				(456)
Accretion of net gain on terminated cash flow hedges, tax			23	24
Net yield adjustment from cash flow hedges currently in effect, tax			(43,535)	9,192
Amortization of prior service credit, tax			155	413
Amortization of actuarial gains (losses), tax			410	(3,371)
Total other comprehensive income (loss), tax			48,302	269,431
Ending balance, tax	324,449	313,907	324,449	313,907
Beginning balance, net of tax			(790,030)	(127,578)
Unrealized holding losses, net of tax			(1,778)	(427,080)
Foreign currency translation adjustments, net of tax	(2,457)	(5,359)	53	(11,271)
Unrealized losses on cash flow hedges, net of tax			(275,060)	(318,160)
Total other comprehensive income (loss) before reclassifications, net of tax			(276,785)	(756,511)
Amortization of unrealized holding losses on held-to-maturity securities				1,310
Accretion of net gain on terminated cash flow hedges, net of tax			(68)	(66)
Net yield adjustment from cash flow hedges currently in effect, net of tax			129,516	(26,308)
Amortization of prior service credit, net of tax			(1,235)	(1,279)
Amortization of actuarial gains (losses), net of tax			(3,276)	10,439
Total other comprehensive income (loss)	(77,078)	(393,503)	(151,848)	(772,415)
Ending balance, net of tax	(941,878)	(899,993)	(941,878)	(899,993)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(272,856)	(360,276)
Amortization of prior service credit, before tax			(1,390)	(1,692)
Amortization of actuarial gains (losses), before tax			(3,686)	13,810
Total other comprehensive income (loss), before tax			(5,076)	12,118
Ending balance, before tax	(277,932)	(348,158)	(277,932)	(348,158)
Total other comprehensive income (loss)			(4,511)
Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(349,129)	83,531
Foreign currency translation adjustment, before tax			71	(14,564)
Unrealized losses on cash flow hedges			(365,739)	(429,310)
Total other comprehensive income (loss) before reclassifications, before tax			(365,668)	(443,874)
Accretion of net gain on terminated cash flow hedges, before tax			(91)	(90)
Net yield adjustment from cash flow hedges currently in effect, before tax			173,051	(35,500)
Total other comprehensive income (loss), before tax			(192,708)	(479,464)
Ending balance, before tax	(541,837)	(395,933)	(541,837)	(395,933)
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, before tax			(444,192)	104,691
Unrealized holding losses, net, before tax			(2,366)	(576,266)
Total other comprehensive income (loss) before reclassifications, before tax			(2,366)	(576,266)
Amortization of unrealized holding losses on held-to-maturity securities				1,766
Total other comprehensive income (loss), before tax			(2,366)	(574,500)
Ending balance, before tax	$ (446,558)	$ (469,809)	(446,558)	$ (469,809)
Total other comprehensive income (loss)			$ (1,778)

Comprehensive Income - Accumula

Comprehensive Income - Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 25,800,933	$ 25,794,531	$ 25,317,990	$ 17,903,405
Net loss during period	(77,078)	(393,503)	(151,848)	(772,415)
Ending balance	26,196,502	25,256,493	26,196,502	25,256,493
Investment Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(329,168)
Net loss during period			(1,778)
Ending balance	(330,946)		(330,946)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(202,186)
Net loss during period			(4,511)
Ending balance	(206,697)		(206,697)
Accumulated Other Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(258,676)
Net loss during period			(145,559)
Ending balance	(404,235)		(404,235)
Accumulated Other Comprehensive Income (Loss), Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(864,800)	(506,490)	(790,030)	(127,578)
Net loss during period			(151,848)
Ending balance	$ (941,878)	$ (899,993)	$ (941,878)	$ (899,993)

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 25,977,000		$ 25,977,000		$ 17,400,000
Unrealized net loss recognized in other comprehensive income related to cash flow hedges			529,000
Aggregate fair value of derivative financial instruments in asset position	381,000		381,000		314,000
Collateral relating to net asset positions	386,000		386,000		312,000
Clearinghouse Credit Facilities [Member]
Derivative [Line Items]
Amount of initial margin posted	143,000		143,000		205,000
Interest Income [Member]
Derivative [Line Items]
Changes in Cash Flow Hedges Derivative Instruments At Fair Value Net	173,000	$ 36,000	173,000	$ 36,000
Change in Cash Flow Hedges Derivative Instruments At Fair Value Net	65,000	22,000
Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Increase decrease in net interest income due to interest rate swap agreements	$ 79,000	$ 22,000	$ 211,000	$ 50,000
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating	Interest and Dividend Income, Operating
Interest Rate Swap Agreements [Member] \| Maturity Period 2024 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges			$ 13,000
Interest Rate Swap Agreements [Member] \| Maturity Period 2025 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges			357,000
Interest Rate Swap Agreements [Member] \| Maturity Period 2026 [Member]
Derivative [Line Items]
Unrealized net loss recognized in other comprehensive income related to cash flow hedges			159,000
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 44,200,000		44,200,000		45,100,000
Foreign Exchange and Other Option and Futures Contracts [Member]
Derivative [Line Items]
Notional amounts of derivative contracts entered into for trading account purposes	$ 1,500,000		$ 1,500,000		$ 1,700,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount	$ 25,977,000	$ 17,400,000
Average Maturity (in years)	2 years 4 months 24 days	1 year 7 months 6 days
Estimated Fair Value Gain (Loss)	$ 12,185	$ (7,892)
Interest Payments On Variable Rate Commercial Real Estate Loans [Member] \| Cash Flow Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 23,977,000	$ 15,900,000
Average Maturity (in years)	2 years	1 year 4 months 24 days
Weighted-Average Rate, Fixed	3.45%	1.91%
Weighted-Average Rate, Variable	5.32%	4.38%
Estimated Fair Value Gain (Loss)	$ 9,077	$ (7,059)
Fixed Rate Long-Term Borrowings [Member] \| Fair Value Hedges [Member]
Derivative [Line Items]
Notional Amount	$ 2,000,000	$ 1,500,000
Average Maturity (in years)	6 years 7 months 6 days	3 years 3 months 18 days
Weighted-Average Rate, Fixed	3.11%	2.98%
Weighted-Average Rate, Variable	5.74%	4.52%
Estimated Fair Value Gain (Loss)	$ 3,108	$ (833)

Derivative Financial Instrume_5

Derivative Financial Instruments - Information about Interest Rate Swap Agreements (Parenthetical) (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional Amount	$ 25,977,000	$ 17,400,000
Forward-Starting Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Notional Amount	9,400,000	4,700,000
Fair Value Hedges [Member]
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments	163,900	65,000
Cash Flow Hedges [Member]
Derivative [Line Items]
Impact of estimated fair value gain (losses) on hedging instruments	$ 538,500	$ 329,700

Derivative Financial Instrume_6

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 420,302	$ 435,969
Liability Derivatives, Fair Value	1,489,795	1,355,326
Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	18,469	4,239
Liability Derivatives, Fair Value	900	9,103
Fair Value Hedges [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	339,417	379,868
Liability Derivatives, Fair Value	1,435,029	1,300,184
Fair Value Hedges [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	62,416	51,862
Liability Derivatives, Fair Value	53,866	46,039
Interest Rate Swap Agreements [Member] \| Fair Value Hedges [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	12,471	1,202
Liability Derivatives, Fair Value	286	9,094
Commitments to Sell Real Estate Loans [Member] \| Fair Value Hedges [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	5,998	3,037
Liability Derivatives, Fair Value	614	9
Commitments to Sell Real Estate Loans [Member] \| Fair Value Hedges [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	60,036	51,410
Liability Derivatives, Fair Value	83	14
Mortgage-Related Commitments to Originate Real Estate Loans for Sale [Member] \| Fair Value Hedges [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	2,380	452
Liability Derivatives, Fair Value	53,783	46,025
Interest Rate Contracts [Member] \| Fair Value Hedges [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	323,865	355,806
Liability Derivatives, Fair Value	1,420,668	1,278,180
Foreign Exchange and Other Option and Futures Contracts [Member] \| Fair Value Hedges [Member] \| Derivatives Not Designated and Qualifying as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	15,552	24,062
Liability Derivatives, Fair Value	$ 14,361	$ 22,004

Derivative Financial Instrume_7

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Offsetting [Abstract]
Reduction in estimated fair value of interest rate contracts in asset position	$ 1,200	$ 1,100
Reduction in estimated fair value of interest rate contracts in liability position	$ 15.7	$ 29.2

Derivative Financial Instrume_8

Derivative Financial Instruments - Information about Fair Values of Derivative Instruments in Consolidated Statement of Income (Detail) - 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]
Derivatives not designated as hedging instruments, Derivatives	$ 10,543	$ 11,408	$ 36,404	$ 28,608
Interest Rate Swap Agreements [Member] \| Fixed Rate Long-Term Borrowings [Member] \| Derivatives Designated and Qualifying as Hedging Instruments [Member] \| Fair Value Hedges [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives in fair value hedging relationships, Derivative	$ (60,605)	$ (50,976)	$ (94,997)	$ (114,932)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense	Other Noninterest Expense
Derivatives in fair value hedging relationships, Hedged item	$ 60,737	$ 50,821	$ 95,920	$ 114,581
Interest Rate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	6,311	6,946	25,027	17,907
Foreign Exchange and Other Option and Futures Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives not designated as hedging instruments, Derivatives	$ 4,232	$ 4,462	$ 11,377	$ 10,701

Derivative Financial Instrume_9

Derivative Financial Instruments - Information about Hedged Items Included in Consolidated Balance Sheet (Detail) - Long-term Debt [Member] - Derivatives Designated and Qualifying as Hedging Instruments [Member] - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ 1,834,030	$ 1,433,731
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Derivatives, Fair Value [Line Items]
Hedged Item	$ (161,230)	$ (65,310)

Variable Interest Entities an_2

Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Loss on securitization of assets				$ 0
Other assets for its "investment" in the common securities recognized by the company of various trusts		$ 22,000,000		22,000,000		$ 22,000,000
Total assets of partnerships in which the company invested		209,124,316,000		209,124,316,000		200,729,841,000
Investment in partnership carrying amount		1,400,000,000		1,400,000,000		1,500,000,000
Unfunded commitments includes carrrying amount of its investments		491,000,000		491,000,000		545,000,000
Contingent Commitments to Provide Additional Capital Contributions to Partnerships		49,000,000		49,000,000
Maximum exposure to loss of investments in real estate partnerships		2,100,000,000		2,100,000,000
Investments amortized to income tax expense		46,000,000	$ 37,000,000	128,000,000	$ 94,000,000
Federal tax credits and other federal tax benefits recognized		52,000,000	$ 44,000,000	147,000,000	$ 108,000,000
Remaining balance of loans and leases		133,133,497,000		133,133,497,000		132,074,156,000
Loans and leases		130,302,558,000		130,302,558,000		129,638,832,000
Asset-backed notes		516,668,000		516,668,000
Senior notes		3,741,161,000		3,741,161,000		1,249,141,000
Asset-backed Notes [Member]
Remaining balance of loans and leases		643,000,000		643,000,000
Loans and leases	$ 666,000,000
Asset-backed notes	$ 88,000,000	517,000,000		517,000,000
Loans and leases average rate	5.84%
Senior notes	$ 550,000,000
Asset-backed notes weighed average estimated life	2 years
Variable Interest Entity Primary Beneficiary [Member]
Total assets of partnerships in which the company invested		$ 9,800,000,000		$ 9,800,000,000		$ 9,200,000,000

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 10,592,409	$ 10,748,961
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	118,838	117,847
Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	18,160
U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	953,285	7,670,960
Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	525,469	574,299
Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,168,287	2,330,118
Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	163,546	173,584
Fair Value Measurements, Recurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	136,998	117,847
Debt Securities, Available-for-Sale	10,592,409	10,748,961
Equity Securities, FV-NI, Current	259,216	151,458
Real estate loans held for sale	430,720	162,393
Other assets	420,302	435,969
Total assets	11,839,645	11,616,628
Other liabilities	1,489,795	1,355,326
Total liabilities	1,489,795	1,355,326
Fair Value Measurements, Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	118,838	117,847
Equity Securities, FV-NI, Current	252,080	145,289
Total assets	370,918	263,136
Fair Value Measurements, Recurring [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Trading account	18,160
Debt Securities, Available-for-Sale	10,592,409	10,748,961
Equity Securities, FV-NI, Current	7,136	6,169
Real estate loans held for sale	430,720	162,393
Other assets	417,922	435,517
Total assets	11,466,347	11,353,040
Other liabilities	1,436,012	1,309,301
Total liabilities	1,436,012	1,309,301
Fair Value Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Other assets	2,380	452
Total assets	2,380	452
Other liabilities	53,783	46,025
Total liabilities	53,783	46,025
Fair Value Measurements, Recurring [Member] \| U.S. Treasury and Federal Agencies [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,735,107	7,670,960
Fair Value Measurements, Recurring [Member] \| U.S. Treasury and Federal Agencies [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	7,735,107	7,670,960
Fair Value Measurements, Recurring [Member] \| Commercial Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	525,469	574,299
Fair Value Measurements, Recurring [Member] \| Commercial Mortgage-Backed Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	525,469	574,299
Fair Value Measurements, Recurring [Member] \| Residential Mortgage-Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,168,287	2,330,118
Fair Value Measurements, Recurring [Member] \| Residential Mortgage-Backed Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	2,168,287	2,330,118
Fair Value Measurements, Recurring [Member] \| Other Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	163,546	173,584
Fair Value Measurements, Recurring [Member] \| Other Debt Securities [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Debt Securities, Available-for-Sale	$ 163,546	$ 173,584

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Fair Value Measurements, Recurring [Member] - Significant Unobservable Inputs (Level 3) [Member] - Other Assets and Other Liabilities [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ (37,178)	$ (24,181)	$ (45,573)	$ 6,440
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Included in earnings	$ (10,155)	$ (9,321)	$ 6,301	$ (34,630)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Revenue from Contract with Customer, Including Assessed Tax	Revenue from Contract with Customer, Including Assessed Tax	Revenue from Contract with Customer, Including Assessed Tax	Revenue from Contract with Customer, Including Assessed Tax
Transfers out of Level 3	$ (4,070)	$ (14,804)	$ (12,131)	$ (20,116)
Ending Balance	(51,403)	(48,306)	(51,403)	(48,306)
Changes in net unrealized gains (losses) included in earnings related to instruments still held at period end	$ (12,957)	$ (17,160)	$ (12,341)	$ (48,108)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Weighted-average discount rates for fair value estimations			44%
Historical recovery rate of collateral values of consumer installment loans			51%
Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations			10%
Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rates for fair value estimations			90%
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Change in fair value of nonrecurring fair value measured loans for charge-offs and impairment reserves	$ 116,000,000	$ 38,000,000	$ 269,000,000	$ 128,000,000
Significant Unobservable Inputs (Level 3) [Member] \| Residential Mortgage Loans [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Capitalized servicing rights, valuation allowance			0		$ 0
Valuation Allowances Recorded		(10,000,000)		(24,000,000)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	804,000,000	706,000,000	804,000,000	706,000,000	853,000,000
Fair Value, Measurements, Nonrecurring [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	316,000,000	439,000,000	316,000,000	439,000,000	329,000,000
Fair Value, Measurements, Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Loans measured at fair value on nonrecurring basis	$ 488,000,000	$ 267,000,000	$ 488,000,000	$ 267,000,000	$ 524,000,000

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative Information Related to Significant Unobservable Inputs (Detail) - Fair Value Measurements, Recurring [Member] - Other Assets and Other Liabilities [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Minimum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	0%	0%
Maximum [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	99%	97%
Weighted Average [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Commitment expirations	8%	3%
Discounted Cash Flows [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Recurring fair value measurements for certain Level 3 Assets and Liabilities	$ (51,403)	$ (45,573)

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Value for Financial Instrument Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financial assets:
Interest-bearing deposits at banks	$ 30,114,286		$ 24,958,719
Federal funds sold			3,000
Investment securities	27,336,103		25,210,871
Loans and leases:
Loans and leases	133,133,497		132,074,156
Allowance for credit losses	(2,052,127)	$ (1,998,366)	(1,925,331)	$ (1,875,591)	$ (1,823,790)	$ (1,469,226)
Loans and leases, net	130,302,558		129,638,832
Financial liabilities:
Noninterest-bearing deposits	(53,786,987)		(65,501,860)
Savings and interest-checking deposits	(90,297,219)		(87,911,463)
Time deposits	(20,043,601)		(10,101,545)
Short-term borrowings	(530,663)		(354,670)
Long-term borrowings	(7,123,426)		(3,964,537)
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets:
Cash and cash equivalents	1,701,427		1,371,688
Trading account	118,838		117,847
Investment securities	252,080		145,289
Significant Observable Inputs (Level 2) [Member]
Financial assets:
Cash and cash equivalents	67,437		145,556
Interest-bearing deposits at banks	30,114,286		24,958,719
Federal funds sold			3,000
Trading account	18,160
Investment securities	25,231,860		23,860,445
Loans and leases:
Loans and leases, net	7,034,104		7,180,192
Accrued interest receivable	734,036		646,250
Financial liabilities:
Noninterest-bearing deposits	(53,786,987)		(65,501,860)
Savings and interest-checking deposits	(90,297,219)		(87,911,463)
Time deposits	(19,931,959)		(10,143,110)
Short-term borrowings	(6,730,663)		(3,554,951)
Long-term borrowings	(6,811,799)		(3,926,489)
Accrued interest payable	(401,752)		(81,356)
Other financial instruments:
Commitments to sell real estate loans	65,337		54,424
Interest rate swap agreements used for interest rate risk management	12,185		(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(1,095,612)		(920,316)
Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Investment securities	45,986		50,588
Loans and leases:
Consumer loans	19,351,349		20,093,523
Loans and leases, net	118,417,220		119,048,176
Other financial instruments:
Commitments to originate real estate loans for sale	(51,403)		(45,573)
Other credit-related commitments	(150,708)		(148,772)
Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,768,864		1,517,244
Interest-bearing deposits at banks	30,114,286		24,958,719
Federal funds sold			3,000
Trading account	136,998		117,847
Investment securities	27,336,103		25,210,871
Loans and leases:
Consumer loans	20,274,784		20,593,079
Allowance for credit losses	(2,052,127)		(1,925,331)
Loans and leases, net	130,302,558		129,638,832
Accrued interest receivable	734,036		646,250
Financial liabilities:
Noninterest-bearing deposits	(53,786,987)		(65,501,860)
Savings and interest-checking deposits	(90,297,219)		(87,911,463)
Time deposits	(20,043,601)		(10,101,545)
Short-term borrowings	(6,730,663)		(3,554,951)
Long-term borrowings	(7,123,426)		(3,964,537)
Accrued interest payable	(401,752)		(81,356)
Other financial instruments:
Commitments to originate real estate loans for sale	(51,403)		(45,573)
Commitments to sell real estate loans	65,337		54,424
Other credit-related commitments	(150,708)		(148,772)
Interest rate swap agreements used for interest rate risk management	12,185		(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(1,095,612)		(920,316)
Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Financial assets:
Cash and cash equivalents	1,768,864		1,517,244
Interest-bearing deposits at banks	30,114,286		24,958,719
Federal funds sold			3,000
Trading account	136,998		117,847
Investment securities	25,529,926		24,056,322
Loans and leases:
Consumer loans	19,351,349		20,093,523
Loans and leases, net	125,451,324		126,228,368
Accrued interest receivable	734,036		646,250
Financial liabilities:
Noninterest-bearing deposits	(53,786,987)		(65,501,860)
Savings and interest-checking deposits	(90,297,219)		(87,911,463)
Time deposits	(19,931,959)		(10,143,110)
Short-term borrowings	(6,730,663)		(3,554,951)
Long-term borrowings	(6,811,799)		(3,926,489)
Accrued interest payable	(401,752)		(81,356)
Other financial instruments:
Commitments to originate real estate loans for sale	(51,403)		(45,573)
Commitments to sell real estate loans	65,337		54,424
Other credit-related commitments	(150,708)		(148,772)
Interest rate swap agreements used for interest rate risk management	12,185		(7,892)
Interest rate and foreign exchange contracts not designated as hedging instruments	(1,095,612)		(920,316)
Commercial Loans and Leases [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	44,080,119		41,139,985
Commercial Loans and Leases [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases	45,058,033		41,850,566
Commercial Loans and Leases [Member] \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	44,080,119		41,139,985
Commercial [Member] \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	226,022		130,652
Commercial [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	41,047,058		43,083,994
Commercial [Member] \| Carrying Amount [Member]
Loans and leases:
Loans and leases	43,573,598		45,364,571
Commercial [Member] \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	41,273,080		43,214,646
Residential Real Estate Loans \| Significant Observable Inputs (Level 2) [Member]
Loans and leases:
Loans and leases	6,808,082		7,049,540
Residential Real Estate Loans \| Significant Unobservable Inputs (Level 3) [Member]
Loans and leases:
Loans and leases	13,938,694		14,730,674
Residential Real Estate Loans \| Carrying Amount [Member]
Loans and leases:
Loans and leases	23,448,270		23,755,947
Residential Real Estate Loans \| Cumulative Amount of Fair Value Hedging Adjustment Increasing (Decreasing) the Carrying Amount [Member]
Loans and leases:
Loans and leases	$ 20,746,776		$ 21,780,214

Commitments and Contingencies -

Commitments and Contingencies - Commitments and Contingent Liabilities Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Commitments to extend credit
Home equity lines of credit	$ 8,167,368	$ 8,261,560
Commercial real estate loans to be sold	338,569	348,701
Other commercial real estate	6,224,142	5,776,116
Residential real estate loans to be sold	237,683	31,208
Other residential real estate	406,667	505,121
Commercial and other	33,670,583	32,625,840
Standby letters of credit	2,333,434	2,376,644
Commercial letters of credit	72,053	65,066
Financial guarantees and indemnification contracts	4,209,726	4,022,432
Commitments to sell real estate loans	$ 948,190	$ 533,458

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	May 11, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Loss Contingencies [Line Items]
Commitments to extend credit to commercial customers		$ 12,500,000,000		$ 12,500,000,000		$ 11,700,000,000
Maximum credit risk for recourse associated with loans sold under Federal National Mortgage Association Delegated Underwriting and Servicing program		4,000,000,000		4,000,000,000		3,900,000,000
Estimate assessed losses	$ 15,800,000,000
Estimated uninsured deposits						$ 5,000,000,000
Annual special assessment rate	0.125%
Quarterly special assessment rate	0.0313%
FDIC assessments		29,364,000	$ 28,105,000	87,054,000	$ 66,266,000
FDIC estimated assessment				183,000,000
Minimum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses		0		0
Maximum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses		$ 25,000,000		$ 25,000,000

Segment Information - Informati

Segment Information - Information about Company's Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net Income (Loss)	$ 689,941	$ 646,596	$ 2,258,599	$ 1,226,292
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	2,334,969	2,241,770	7,342,666	5,669,648
Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		2,241,770		5,669,648
Net Income (Loss)		646,596		1,226,292
Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		2,241,770		5,669,648
Net Income (Loss)		646,596		1,226,292
Business Banking [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	117,290	92,618	346,704	199,733
Business Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	291,839	241,629	842,571	586,605
Business Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	980	663	2,904	2,060
Business Banking [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		241,629		586,605
Net Income (Loss)		94,094		205,741
Business Banking [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		241,629		586,605
Net Income (Loss)		92,618		199,733
Business Banking [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)		(1,476)		(6,008)
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	167,714	211,225	553,255	501,495
Commercial Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	453,326	509,376	1,420,971	1,236,750
Commercial Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	8,224	802	27,742	2,605
Commercial Banking [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		510,549		1,239,300
Net Income (Loss)		214,063		521,749
Commercial Banking [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		509,376		1,236,750
Net Income (Loss)		211,225		501,495
Commercial Banking [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		(1,173)		(2,550)
Net Income (Loss)		(2,838)		(20,254)
Commercial Real Estate [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	72,442	110,034	192,539	339,225
Commercial Real Estate [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	231,303	247,114	674,276	705,883
Commercial Real Estate [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	188	249	745	687
Commercial Real Estate [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		234,479		676,176
Net Income (Loss)		94,937		314,284
Commercial Real Estate [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		247,114		705,883
Net Income (Loss)		110,034		339,225
Commercial Real Estate [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		12,635		29,707
Net Income (Loss)		15,097		24,941
Discretionary Portfolio [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	(21,586)	(6,261)	(93,678)	72,835
Discretionary Portfolio [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	(20,672)	11,641	(78,005)	150,895
Discretionary Portfolio [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	(14,110)	(23,044)	(44,124)	(74,952)
Discretionary Portfolio [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		36,622		190,761
Net Income (Loss)		11,813		103,283
Discretionary Portfolio [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		11,641		150,895
Net Income (Loss)		(6,261)		72,835
Discretionary Portfolio [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		(24,981)		(39,866)
Net Income (Loss)		(18,074)		(30,448)
Residential Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	(14,422)	(2,110)	(41,676)	32,933
Residential Mortgage Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	100,444	95,091	280,654	346,409
Residential Mortgage Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	19,373	35,647	60,599	110,986
Residential Mortgage Banking [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		95,091		346,409
Net Income (Loss)		(3,283)		35,028
Residential Mortgage Banking [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		95,091		346,409
Net Income (Loss)		(2,110)		32,933
Residential Mortgage Banking [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)		1,173		(2,095)
Retail Banking [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	342,700	182,794	995,927	366,445
Retail Banking [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	876,002	650,227	2,572,410	1,523,992
Retail Banking [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	(35)	(5)	(113)	(12)
Retail Banking [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		650,229		1,523,992
Net Income (Loss)		181,639		379,688
Retail Banking [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		650,227		1,523,992
Net Income (Loss)		182,794		366,445
Retail Banking [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		(2)
Net Income (Loss)		1,155		(13,243)
All Other [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)	25,803	58,296	305,528	(286,374)
All Other [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues	402,727	486,692	1,629,789	1,119,114
All Other [Member] \| Intersegment Activity Eliminated in Consolidated Totals [Member]
Segment Reporting Information [Line Items]
Total Revenues	$ (14,620)	(14,312)	$ (47,753)	(41,374)
All Other [Member] \| Previously Reported [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		473,171		1,106,405
Net Income (Loss)		53,333		(333,481)
All Other [Member] \| Revision of Prior Period, Reclassification, Adjustment [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		486,692		1,119,114
Net Income (Loss)		58,296		(286,374)
All Other [Member] \| Impact Of Changes [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Revenues		13,521		12,709
Net Income (Loss)		$ 4,963		$ 47,107

Segment Information - Informa_2

Segment Information - Information about Company's Segments (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Taxable-equivalent adjustment	$ 14.3	$ 11.8	$ 41.7	$ 25.8
Average total assets	$ 204,266	187,395	$ 204,266	187,395	$ 190,252
Hospitality [Member]
Segment Reporting Information [Line Items]
Average total assets		$ 1,170		$ 1,170

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Segment Reporting Information [Line Items]
Average total assets	$ 204,266	$ 190,252	$ 187,395
Business Banking [Member]
Segment Reporting Information [Line Items]
Average total assets	7,968	7,597	7,515
Commercial Banking [Member]
Segment Reporting Information [Line Items]
Average total assets	49,373	40,930	39,293
Commercial Real Estate [Member]
Segment Reporting Information [Line Items]
Average total assets	31,878	30,599	29,982
Discretionary Portfolio [Member]
Segment Reporting Information [Line Items]
Average total assets	50,900	42,657	40,987
Residential Mortgage Banking [Member]
Segment Reporting Information [Line Items]
Average total assets	2,746	3,986	4,370
Retail Banking [Member]
Segment Reporting Information [Line Items]
Average total assets	21,261	20,312	20,063
All Other [Member]
Segment Reporting Information [Line Items]
Average total assets	$ 40,140	$ 44,171	$ 45,185

Relationship with Bayview Len_2

Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 7,123,426,000		$ 7,123,426,000		$ 3,964,537,000
Bayview Lending Group [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of minority interest investment in Bayview Lending Group LLC	$ 0		$ 0
Minority interest in Bayview Lending Group LLC	20%		20%
Bayview Lending Group [Member] \| Other Revenues From Operations [Member]
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments	$ 0	$ 0	$ 20,000,000	$ 30,000,000
Bayview Lending Group and Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of mortgage servicing rights	1,200,000,000		1,200,000,000		1,400,000,000
Revenue from contract with customer	1,000,000	3,000,000	5,000,000	7,000,000
Bayview Financial [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balances of residential mortgage loans from Bayview Financial	114,600,000,000		114,600,000,000		96,000,000,000
Revenues from sub-servicing	30,000,000	$ 33,000,000	94,000,000	$ 119,000,000
Investment securities in held-to-maturity portfolio securitized by Bayview Financial	44,000,000		44,000,000		$ 50,000,000
Bayview Financial [Member] \| Syndicated Loan Facility [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	3,100,000,000		3,100,000,000
Bayview Financial [Member] \| Syndicated Loan Facility [Member] \| M&T Bank [Member]
Schedule of Equity Method Investments [Line Items]
Loan facility carrying amount	$ 765,000,000		$ 765,000,000