Cathay General Bancorp (CATY) 10-K29 Feb 242023 FY Annual reportFinancial data

Company Profile

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2023	Feb. 15, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0000861842
Entity Registrant Name	Cathay General Bancorp
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-31830
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4274680
Entity Address, Address Line One	777 North Broadway
Entity Address, City or Town	Los Angeles
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	90012
City Area Code	213
Local Phone Number	625-4700
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	CATY
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 2,215,336,347
Entity Common Stock, Shares Outstanding		72,669,738
Auditor Name	KPMG LLP
Auditor Location	Los Angeles, California
Auditor Firm ID	185

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 173,988	$ 195,440
Short-term investments and interest-bearing deposits	654,813	966,962
Securities available-for-sale (amortized cost of $1,726,080 in 2023 and $1,622,173 in 2022)	1,604,570	1,473,348
Loans	19,548,140	18,254,024
Less: Allowance for loan losses	(154,562)	(146,485)
Unamortized deferred loan fees, net	(10,720)	(6,641)
Loans, net	19,382,858	18,100,898
Equity securities	40,406	22,158
Federal Home Loan Bank stock	17,746	17,250
Other real estate owned, net	19,441	4,067
Affordable housing investments and alternative energy partnerships, net	315,683	327,128
Premises and equipment, net	91,097	94,776
Customers’ liability on acceptances	3,264	2,372
Accrued interest receivable	97,673	82,428
Goodwill	375,696	375,696
Other intangible assets, net	4,461	5,757
Right-of-use assets- operating leases	32,076	29,627
Other assets	267,762	250,069
Total assets	23,081,534	21,947,976
Deposits:
Non-interest-bearing demand deposits	3,529,018	4,168,989
Interest-bearing deposits:
NOW deposits	2,370,685	2,509,736
Money market deposits	3,049,754	3,812,724
Savings deposits	1,039,203	1,000,460
Time deposits	9,336,787	7,013,370
Total deposits	19,325,447	18,505,279
Advances from the Federal Home Loan Bank	540,000	485,000
Other borrowings for affordable housing investments	15,787	22,600
Long-term debt	119,136	119,136
Acceptances outstanding	3,264	2,372
Lease liabilities - operating leases	34,797	32,518
Other liabilities	306,528	307,031
Total liabilities	20,344,959	19,473,936
Commitments and contingencies
Stockholders’ Equity
Common stock, $0.01 par value, 100,000,000 shares authorized, 91,392,480 issued and 72,668,927 outstanding at December 31, 2023, and 91,090,614 issued and 72,742,151 outstanding at December 31, 2022	914	911
Additional paid-in-capital	987,953	981,119
Accumulated other comprehensive income loss, net	(85,416)	(102,295)
Retained earnings	2,500,341	2,244,855
Treasury stock, at cost (18,723,553 shares at December 31, 2023, and 18,348,463 shares at December 31, 2022)	(667,217)	(650,550)
Total equity	2,736,575	2,474,040
Total liabilities and equity	$ 23,081,534	$ 21,947,976

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities available-for-sale, amortized cost	$ 1,726,080	$ 1,622,173
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	91,392,480	91,090,614
Common stock, shares outstanding (in shares)	72,668,927	72,742,151
Treasury stock, shares (in shares)	18,723,553	18,348,463

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and Dividend Income
Loan receivable	$ 1,130,242	$ 801,981	$ 649,224
Investment securities	51,717	28,240	14,151
Federal Home Loan Bank stock	1,349	1,103	991
Deposits with banks	58,914	19,957	2,145
Total interest and dividend income	1,242,222	851,281	666,511
Interest Expense
Time deposits	331,997	56,354	40,542
Other deposits	135,965	48,942	21,259
Advances from the Federal Home Loan Bank	22,164	5,880	1,182
Long-term debt	6,480	5,546	5,773
Short-term borrowings	3,870	862	0
Total interest expense	500,476	117,584	68,756
Net interest income before provision for credit losses	741,746	733,697	597,755
Provision/(reversal) for credit losses	(25,978)	(14,543)	16,008
Net interest income after provision for credit losses	715,768	719,154	613,763
Non-Interest Income
Net gains/(losses) from equity securities	18,248	392	(1,426)
Securities (losses)/gains, net	(3,000)	0	853
Letters of credit commissions	6,716	6,351	7,103
Other operating income	22,390	27,112	27,433
Total non-interest income	68,292	56,814	54,603
Non-Interest Expense
Salaries and employee benefits	154,149	142,546	132,795
Occupancy expense	22,270	22,808	20,318
Computer and equipment expense	17,478	13,603	13,549
Professional services expense	32,491	28,237	23,666
Data processing service expense	14,728	13,181	13,607
FDIC and State assessments	23,588	8,037	7,132
Marketing expense	5,887	6,863	6,913
Other real estate owned expense	761	127	343
Amortization of investments in low income housing and Alternative energy partnerships	86,616	42,065	45,447
Amortization of core deposit premium	1,310	1,892	687
Cost associated with debt redemption	0	0	732
Acquisition, integration and reorganization costs	671	4,127	1,425
Other operating expense	20,529	19,946	19,909
Total non-interest expense	380,478	303,432	286,523
Income before income tax expense	403,582	472,536	381,843
Income tax expense	49,458	111,894	83,539
Net income	354,124	360,642	298,304
Other Comprehensive Income/(Loss), Net of Tax:
Net holding gains/(losses) on securities available-for-sale	18,642	(105,043)	(11,989)
Net holding (losses)/gains on cash flow hedge derivatives	(1,763)	5,813	3,614
Total other comprehensive income/(loss), net of tax	16,879	(99,230)	(8,375)
Total comprehensive income	$ 371,003	$ 261,412	$ 289,929
Net Income Per Common Share
Basic (in dollars per share)	$ 4.88	$ 4.85	$ 3.81
Diluted (in dollars per share)	4.86	4.83	3.8
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 1.36	$ 1.36	$ 1.27
Average Common Shares Outstanding:
Basic (in shares)	72,573,025	74,337,265	78,268,369
Diluted (in shares)	72,862,628	74,664,735	78,570,638
Deposit Account [Member]
Non-Interest Income
Non-Interest Income	$ 6,432	$ 6,523	$ 5,584
Asset Management [Member]
Non-Interest Income
Non-Interest Income	$ 17,506	$ 16,436	$ 15,056

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands		Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock Outstanding [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock, Common [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock Outstanding [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Treasury Stock, Common [Member]	Total
Balance (in shares) at Dec. 31, 2020								79,508,265
Beginning balance, loss, net of tax (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2020	[1]	$ 0	$ 0	$ 0	$ (3,139)	$ 0	$ (3,139)
Beginning balance, loss, net of tax at Dec. 31, 2020								$ 906	$ 964,734	$ 5,310	$ 1,789,325	$ (342,131)	$ 2,418,144
Dividend Reinvestment Plan (in shares)								84,011					84,011
Dividend Reinvestment Plan								$ 1	3,562	0	0	0	$ 3,563
Restricted stock units vested (in shares)								123,893
Restricted stock units vested								$ 2	0	0	0	0	2
Shares withheld related to net share settlement of RSUs								$ 0	(2,632)	0	0	0	(2,632)
Stock issued to directors (in shares)								20,750
Stock issued to directors								$ 0	850	0	0	0	850
Purchases of treasury stock (in shares)								(3,986,057)
Purchases of treasury stock								$ 0	0	0	0	(167,104)	(167,104)
Stock -based compensation								0	5,960	0	0	0	5,960
Cash dividends								0	0	0	(99,322)	0	(99,322)
Other comprehensive income/(loss)								0	0	(8,375)	0	0	(8,375)
Net income								$ 0	0	0	298,304	0	298,304
Balance (in shares) at Dec. 31, 2021								75,750,862
Ending balance, loss, net of tax at Dec. 31, 2021								$ 909	972,474	(3,065)	1,985,168	(509,235)	$ 2,446,251
Dividend Reinvestment Plan (in shares)								86,501					86,501
Dividend Reinvestment Plan								$ 1	3,718	0	0	0	$ 3,719
Restricted stock units vested (in shares)								112,473
Restricted stock units vested								$ 1	0	0	0	0	1
Shares withheld related to net share settlement of RSUs								$ 0	(2,905)	0	0	0	(2,905)
Stock issued to directors (in shares)								19,780
Stock issued to directors								$ 0	849	0	0	0	$ 849
Purchases of treasury stock (in shares)								(3,227,465)					(3,227,465)
Purchases of treasury stock								$ 0	0	0	0	(141,315)	$ (141,315)
Stock -based compensation								0	6,983	0	0	0	6,983
Cash dividends								0	0	0	(100,955)	0	(100,955)
Other comprehensive income/(loss)								0	0	(99,230)	0	0	(99,230)
Net income								$ 0	0	0	360,642	0	360,642
Balance (in shares) at Dec. 31, 2022								72,742,151
Ending balance, loss, net of tax at Dec. 31, 2022								$ 911	981,119	(102,295)	2,244,855	(650,550)	$ 2,474,040
Dividend Reinvestment Plan (in shares)								93,182					93,182
Dividend Reinvestment Plan								$ 1	3,490	0	0	0	$ 3,491
Restricted stock units vested (in shares)								183,324
Restricted stock units vested								$ 2	0	0	0	0	2
Shares withheld related to net share settlement of RSUs								$ 0	(4,490)	0	0	0	(4,490)
Stock issued to directors (in shares)								25,360
Stock issued to directors								$ 0	850	0	0	0	850
Purchases of treasury stock (in shares)								(375,090)
Purchases of treasury stock								$ 0	0	0	0	(16,667)	(16,667)
Stock -based compensation								0	6,984	0	0	0	6,984
Cash dividends								0	0	0	(98,638)	0	(98,638)
Other comprehensive income/(loss)								0	0	16,879	0	0	16,879
Net income								$ 0	0	0	354,124	0	354,124
Balance (in shares) at Dec. 31, 2023								72,668,927
Ending balance, loss, net of tax at Dec. 31, 2023								$ 914	$ 987,953	$ (85,416)	$ 2,500,341	$ (667,217)	$ 2,736,575

[1]Represents the impact of the adoption of Accounting Standards Update ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) on January 1, 2021.

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retained Earnings [Member]
Cash dividends (in dollars per share)	$ 1.36	$ 1.36	$ 1.27
Cash dividends (in dollars per share)	$ 1.36	$ 1.36	$ 1.27

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net income	$ 354,124	$ 360,642	$ 298,304
Adjustments to reconcile net income to net cash provided by operating activities:
Provision/(reversal) for credit losses	25,978	14,543	(16,008)
Provision for losses on other real estate owned	0	0	17
Deferred tax (benefit)/ provision	(4,782)	(2,088)	9,168
Depreciation and amortization	8,371	9,958	7,956
Amortization of right-of-use asset	9,733	9,845	8,160
Change in operating lease liabilities	2,279	(4,629)	(2,790)
Net gains on sale and transfers of other real estate owned	0	(6)	(57)
Net gains on sale of loans	0	(1)	(357)
Proceeds from sales of loans	0	33	5,351
Originations of loans held for sale	0	0	(4,994)
Loss on sales or disposal of fixed assets	6	67	55
Amortization of alternative energy partnerships, venture capital and other investments	86,616	42,065	45,447
Net gain on sales and calls of securities	0	(101)	(853)
Amortization/accretion of security premiums/discount, net	(11,373)	2,465	7,865
Unrealized (gain)/loss on equity securities	(18,248)	(291)	2,036
Write-off of AFS debt securities	3,000	0	0
Stock-based compensation and stock issued to officers as compensation	7,836	7,832	6,810
Net change in accrued interest receivable and other assets	(54,369)	(80,411)	(34,196)
Net change in other liabilities	(24,429)	107,467	2,403
Net cash provided by operating activities	384,742	467,390	334,317
Cash Flows from Investing Activities
Purchase of investment securities available-for-sale	(618,334)	(711,707)	(560,140)
Proceeds from repayment, maturity, and call of investment securities available-for-sale	522,815	213,936	424,386
Proceeds from sale of investment securities available-for-sale	0	0	21,102
Proceeds from sale of equity securities	0	553	0
Benefits received from bank owned life insurance policies	0	4,013	2,752
Purchase of Federal Home Loan Bank stock	(29,381)	(9,776)	0
Redemption of Federal Home Loan Bank stock	28,885	9,776	0
Net increase in loans	(1,327,048)	(1,272,268)	(715,862)
Purchase of premises and equipment	(3,401)	(3,390)	(3,728)
Proceeds from sales of other real estate owned	0	307	795
Net increase in investment in affordable housing and alternative energy partnerships	(50,616)	(6,995)	(29,229)
Acquisitions, net of cash acquired	0	(73,882)	0
Net cash used for investing activities	(1,477,080)	(1,849,433)	(859,924)
Cash Flows from Financing Activities
Increase/(decrease) in deposits	820,041	(128,803)	1,949,728
Advances from Federal Home Loan Bank	14,035,000	5,480,000	50,000
Repayment of Federal Home Loan Bank borrowings	(13,980,000)	(5,015,000)	(180,000)
Cash dividends paid	(98,638)	(100,955)	(99,322)
Purchase of treasury stock	(16,667)	(141,316)	(167,104)
Proceeds from shares issued under Dividend Reinvestment Plan	3,491	3,720	3,563
Taxes paid related to net share settlement of RSUs	(4,490)	(2,905)	(2,632)
Net cash provided by financing activities	758,737	94,741	1,554,233
(Decrease)/increase in cash, cash equivalents, and restricted cash	(333,601)	(1,287,302)	1,028,626
Cash, cash equivalents, and restricted cash, beginning of the year	1,162,402	2,449,704	1,421,078
Cash, cash equivalents, and restricted cash, end of the period	828,801	1,162,402	2,449,704
Supplemental Cash Flow Information
Interest	484,861	105,521	75,486
Income taxes	70,332	96,881	92,691
Non-cash investing and financing activities:
Net change in unrealized holding gain/(loss) on securities available-for-sale, net of tax	18,642	(105,043)	(11,989)
Net change in unrealized holding (loss)/gain on cash flow hedge derivatives	(1,763)	5,813	3,614
Transfers to other real estate owned from loans held-for-investment	15,374	0	205
Loans transferred from held-for-investment to held-for-sale	$ 0	$ 32	$ 0

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	9B. Other Information None.
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Note 1 - Summary of Significant

Note 1 - Summary of Significant Accounting Policies	12 Months Ended
Note 1 - Summary of Significant Accounting Policies	Dec. 31, 2023
Notes to Financial Statements
Significant Accounting Policies [Text Block]	1. Summary of Significant Accounting Policies The accompanying Consolidated Financial Statements include the accounts of Cathay General Bancorp (the “Bancorp”), a Delaware corporation, its wholly-owned subsidiaries, Cathay Bank (the “Bank”), a California state-chartered bank, and eleven limited partnerships investing in affordable housing projects (together, the “Company,” “we,” “us,” or “our”). All significant inter-company transactions and balances have been eliminated in consolidation. The Consolidated Financial Statements of the Company are prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and general practices within the banking industry. Organization and Background The Bancorp’s primary business is to act as the holding company for the Bank. The Bank is a commercial bank, servicing primarily the individuals, professionals, and small to medium-sized businesses in the local markets in which its branches are located. Its operations include the acceptance of checking, savings, and time deposits, and the making of commercial, real estate, and consumer loans. The Bank also offers trade financing, letters of credit, wire transfer, foreign currency spot and forward contracts, Internet banking, investment services, and other customary banking services to its clients. The Bank owns 100% of the common securities of Cathay Holdings LLC. Use of Estimates. Concentrations. December 31, 2023, December 31, 2023, Securities Available for Sale. January 1, 2021, 2016 13, 1 2 not Interest income includes amortization of premiums and discounts as an adjustment of yield on a level-yield basis. Premiums on callable debt securities are amortized to their earliest call date. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. A debt security is placed on nonaccrual status at the time any principal or interest payments become delinquent by 90 not No Allowance for Credit Losses on Available for Sale Securities. first not not not not Changes in the allowance for credit losses are recorded as provision for credit loss expense. Losses are charged against the allowance when management believes the uncollectability of an available-for-sale security is confirmed or when either of the criteria regarding intent or requirement to sell is met. The amortized cost of the Company’s AFS debt securities exclude accrued interest, which is included in “accrued interest receivable” on the Consolidated Balance Sheets. The Company has made an accounting policy election not Trading securities Investment in Federal Home Loan Bank ( FHLB ) Stock. December 31, 2023, 2022, December 31, 2023, Loans Held for Investment. 360 Generally, loans are placed on nonaccrual status when they become 90 not not not Loans held for sale Allowance for Credit Losses ( ACL ) on Loans Held for Investment. 2016 13, Financial Instruments Credit Losses (Topic 326 January 1, 2021 The ACL is the combination of the allowance for loan losses and the reserve for unfunded loan commitments. The allowance for loan losses is reported as a reduction of the amortized cost basis of loans, while the reserve for unfunded loan commitments is included within "other liabilities" on the Consolidated Balance Sheets. The amortized cost basis of loans does not Under the Company’s CECL approach, management estimates the ACL using relevant available information from internal and external sources, relating to past events, current conditions, and reasonable and supportable economic forecasts that vary by loan portfolio. We use economic forecasts from Moody’s Analytics in this process. The economic forecast is updated monthly; therefore, the one one not one Under the CECL methodology, quantitative and qualitative loss factors are applied to our population of loans on a collective pool basis when similar risk characteristics exist. The Company evaluates loans for expected credit losses on an individual basis if, based on current information and events, the loan does not may one 1 2 not Under the Company’s CECL methodology, nine three six six fourth 2007 fourth 2022. fourth 2007 fourth 2022. The Company’s CECL methodology utilizes an eight four 1 10th 3 90th four six The Company’s CECL methodology estimates expected credit losses over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications unless the extension or renewal options are included in the original or modified contract at the reporting date and are not The simplified approach portfolios include Small Business Administration (“SBA”) loans, Home Equity Lines of Credit (“HELOCs”) and cash-secured loans, which are not three first eight four Under the Company’s CECL methodology, the qualitative portion of the reserve on pooled loans represents management’s judgment of additional considerations to account for internal and external risk factors that are not may not not The Company’s CECL methodology requires a significant amount of management judgment in determining the appropriate allowance for credit losses. Several of the steps in the methodology involve judgment and are subjective in nature including, among other things: segmenting the loan portfolio; determining the period over which loss history to consider; selecting predictive econometric regression models that use appropriate macroeconomic variables; determining the methodology to forecast prepayments; selecting the most appropriate economic forecast scenario; determining the length of the R&S forecast and reversion periods; estimating expected utilization rates on unfunded loan commitments; and assessing relevant and appropriate qualitative factors. In addition, the CECL methodology is dependent on economic forecasts that are inherently imprecise and will change from period to period. Although the allowance for credit losses is considered by management to be appropriate, there can be no Management believes the allowance for credit losses is appropriate for the current expected credit losses in our loan portfolio and associated unfunded commitments, and the risk ratings and inherent loss rates currently assigned are reasonable and appropriate as of the reporting date. It is possible that others, given the same information, may Individually Evaluated Loans not no may one 90 The Company has adopted ASU 2022 02, January 1, 2023. Under the new guidance on loan modifications made to borrowers experiencing financial difficulty, when a loan held for investment is modified and is considered to be a continuation of the original loan, the Company uses the post-modification contractual rate to derive the effective interest rate when using a discounted cash flow method to determine the allowance for credit loss. The amendments in this new guidance eliminate the previous TDR recognition and measurement guidance and, instead, require that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. Under the prior TDR guidance, a TDR is a formal modification of the terms of a loan when the lender, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower. The concessions may six The allowance for credit loss on a TDR was measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. Under the prior guidance when the value of a concession was measured using the discounted cash flow method, the allowance for credit loss was determined by discounting the expected future cash flows at the original interest rate of the loan. Unfunded Loan Commitments. not 14 The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company, using the same loss factors as used for the allowance for loan losses. The reserve for unfunded loan commitments uses the expected historical usage rate of the unfunded commitments during the contractual life of the commitments. The allowance for unfunded commitments is included in “other liabilities” on the Consolidated Balance Sheets. Changes in the allowance for unfunded commitments are included in the provision for loan losses. Letter of Credit Fees Other Real Estate Owned ( OREO ). Investments in Affordable Housing Partnerships and Other Tax Credit Investments. 6 December 31, 2023, eleven ten Investments in Venture Capital. Premises and Equipment. Type Estimated Useful Life (years) Buildings 15 to 45 Building improvements 5 to 20 Furniture, fixtures, and equipment 3 to 25 Leasehold improvements Shorter of useful lives or the terms of the leases Improvements are capitalized and amortized to occupancy expense based on the above table. Construction in process is carried at cost and includes land acquisition cost, architectural fees, general contractor fees, capitalized interest and other costs related directly to the construction of a property. Goodwill and Other Intangible Assets. December 31 may not December 31, 2023 2022. Other intangible assets. Bank-Owned Life Insurance. Stock-Based Compensation. Derivatives 815 not third not Foreign Exchange Forwards and Foreign Currency Option Contracts. not Income Taxes. not not Comprehensive Income/(loss). Net Income per Common Share Foreign Currency Translation. Statement of Cash Flows three Segment Reporting. one Accounting Pronouncements Adopted in 2023 In March 2022, 2022 01, 815 not 2022 01 one 2022 01 2022 01 not In March 2022, 2022 02, 326 2022 02 310 40, 2022 02 326 20, 5. Other Accounting Standards Pending Adoption In March 2023, 2023 02, 323 2023 02 2023 02 December 15, 2023. In June 2022, 2022 03, 820 2022 03 not not 2022 03 2022 03 January 1, 2024. 2022 03 not

Note 2 - Business Combinations

Note 2 - Business Combinations	12 Months Ended
Note 2 - Business Combinations	Dec. 31, 2023
Notes to Financial Statements
Business Combination Disclosure [Text Block]	2. Business Combinations The Company’s subsidiary bank, Cathay Bank completed the purchase of HSBC Bank USA, National Association’s West Coast mass retail market consumer banking business and retail business banking business on February 7, 2022. The assets and liabilities, both tangible and intangible, were recorded at their estimated fair values as of the February 7, 2022 The fair value of the assets and the liabilities acquired as of February 7, 2022 Balance Sheet (In thousands) Assets: Cash and cash equivalents $ 473 Loans 641,839 Right-of-use assets - operating leases 6,453 Core deposit intangible 3,138 Other 561 Total assets $ 652,464 Liabilities assumed: Deposits $ 575,163 Lease liabilities 6,453 Total liabilities assumed $ 581,616 Net assets acquired $ 70,848 Total cash paid at closing $ 74,355 Goodwill $ 3,507

Note 3 - Cash, Cash Equivalents

Note 3 - Cash, Cash Equivalents and Restricted Cash	12 Months Ended
Note 3 - Cash, Cash Equivalents and Restricted Cash	Dec. 31, 2023
Notes to Financial Statements
Cash and Cash Equivalents Disclosure [Text Block]	3. Cash, Cash Equivalents and Restricted Cash The Company manages its cash and cash equivalents based upon the Company’s operating, investment, and financing activities. Cash and cash equivalents, for the purpose of reporting cash flows, consist of cash and due from banks and short-term investments and interest-bearing deposits. Cash and due from banks include cash on hand, cash items in transit, cash due from the Federal Reserve Bank of San Francisco (“FRBSF”) and other financial institutions. Short-term investments and interest-bearing deposits include cash placed with other banks with original maturity of three The Company had average excess balance with FRBSF of $1.09 billion and $1.24 billion as of December 31, 2023 2022, December 31, 2023 2022, December 31, 2023 December 31, 2022,

Note 4 - Investment Securities

Note 4 - Investment Securities	12 Months Ended
Note 4 - Investment Securities	Dec. 31, 2023
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	4. Investment Securities Investment Securities. December 31, 2023 December 31, 2022: As of December 31, 2023 Gross Gross Amortized Unrealized Unrealized Cost Gains Losses Fair Value (In thousands) Securities Available-for-Sale U.S. treasury securities $ 495,167 $ 153 $ 20 $ 495,300 U.S. government agency entities 48,282 117 230 48,169 Mortgage-backed securities 892,942 223 106,442 786,723 Collateralized mortgage obligations 31,238 — 3,194 28,044 Corporate debt securities 258,451 22 12,139 246,334 Total $ 1,726,080 $ 515 $ 122,025 $ 1,604,570 As of December 31, 2022 Gross Gross Amortized Unrealized Unrealized Cost Gains Losses Fair Value (In thousands) Securities Available-for-Sale U.S. treasury securities $ 241,611 $ — $ 1,111 $ 240,500 U.S. government agency entities 63,347 384 121 63,610 U.S. government sponsored entities 30,000 — — 30,000 Mortgage-backed securities 993,883 194 126,983 867,094 Collateralized mortgage obligations 34,552 — 3,491 31,061 Corporate debt securities 258,780 112 17,809 241,083 Total $ 1,622,173 $ 690 $ 149,515 $ 1,473,348 The amortized cost and fair value of securities available-for-sale as of December 31, 2023, may may Securities Available-for-Sale As of December 31, 2023 Amortized Cost Fair Value (In thousands) Due in one year or less $ 525,406 $ 524,948 Due after one year through five years 227,132 215,834 Due after five years through ten years 149,042 141,044 Due after ten years 824,500 722,744 Total $ 1,726,080 $ 1,604,570 There were no sales of investment securities during the years ended December 31, 2023 2022. December 31, 2021. December 31, 2021. Allowance for Credit Losses The securities that were in an unrealized loss position as of December 31, 2023, 1 The Company concluded the unrealized losses were primarily attributed to yield curve movement, together with widened liquidity spreads and credit spreads. The issuers have not, no not December 31, 2023 2022, December 31, 2023, 2022 2021. The tables below show the related fair value and the gross unrealized losses of the Company’s investment portfolio, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2023, December 31, 2022: As of December 31, 2023 Less than 12 months 12 months or longer Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized Value Losses Value Losses Value Losses (In thousands) Securities Available-for-Sale U.S. treasury securities $ 49,831 $ 20 $ — $ — $ 49,831 $ 20 U.S. government agency entities 18,301 108 1,313 122 19,614 230 Mortgage-backed securities — — 768,274 106,442 768,274 106,442 Collateralized mortgage obligations — — 28,044 3,194 28,044 3,194 Corporate debt securities 64,448 552 166,864 11,587 231,312 12,139 Total $ 132,580 $ 680 $ 964,495 $ 121,345 $ 1,097,075 $ 122,025 As of December 31, 2022 Less than 12 months 12 months or longer Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized Value Losses Value Losses Value Losses (In thousands) Securities Available-for-Sale U.S. treasury securities $ 240,500 $ 1,111 $ — $ — $ 240,500 $ 1,111 U.S. government agency entities — — 1,806 121 1,806 121 Mortgage-backed securities 394,123 33,042 452,739 93,941 846,862 126,983 Collateralized mortgage obligations 24,427 1,614 6,634 1,877 31,061 3,491 Corporate debt securities 109,995 3,256 100,977 14,553 210,972 17,809 Total $ 769,045 $ 39,023 $ 562,156 $ 110,492 $ 1,331,201 $ 149,515 As of December 31, 2023 no one five eight December 31, 2022, Securities available-for-sale having a carrying value of $134.2 million and $145.7 million as of December 31, 2023, December 31, 2022, Equity securities were $40.4 million and $22.2 million as of December 31, 2023 2022, December 31, 2023, 2022 2021, December 31, 2022.

Note 5 - Loans

Note 5 - Loans	12 Months Ended
Note 5 - Loans	Dec. 31, 2023
Notes to Financial Statements
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	5. Most of the Company’s business activities are with clients located in the high-density Asian-populated areas of Southern and Northern California; New York City, New York; Houston and Dallas, Texas; Seattle, Washington; Boston, Massachusetts; Chicago, Illinois; Edison, New Jersey; Rockville, Maryland; and Las Vegas, Nevada. The Company also has loan clients in Hong Kong. The Company has no The following table presents the composition of the Company’s loans as of December 31, 2023, 2022, As of December 31, 2023 2022 (In thousands) Loans: Commercial loans $ 3,305,048 $ 3,318,778 Construction loans 422,647 559,372 Commercial real estate loans 9,729,581 8,793,685 Residential mortgage loans 5,838,747 5,252,952 Equity lines 245,919 324,548 Installment and other loans 6,198 4,689 Gross loans 19,548,140 18,254,024 Less: Allowance for loan losses (154,562 ) (146,485 ) Unamortized deferred loan fees (10,720 ) (6,641 ) Total loans, net $ 19,382,858 $ 18,100,898 The Company pledged real estate loans of $14.15 billion as of December 31, 2023, December 31, 2022, December 31, 2023, December 31, 2022, Loans serviced for others as of December 31, 2023, December 31, 2022, The Company has entered into transactions with its directors, executive officers, or principal holders of its equity securities, or the associates of such persons (“Related Parties”). All loans to Related Parties were current as of December 31, 2023 2022. December 31, 2023 2022 (In thousands) Balance at beginning of year $ 33,217 $ 38,532 Additional loans made 20,160 25,050 Payment received (7,670 ) (30,365 ) Balance at end of year $ 45,707 $ 33,217 As of December 31, 2023, December 31, 2022. December 31, 2023 2022, December 31, 2023, 2022 2021. December 31, 2023 December 31, 2022. The following tables present the average balance and interest income recognized on non-accrual loans for the periods indicated: For the year ended December 31, 2023 Average Recorded Investment Interest Income Recognized (In thousands) Commercial loans $ 18,008 $ 3 Construction loans 6,336 — Commercial real estate loans 35,742 318 Residential mortgage and equity lines 11,743 — Installment and other loans 1 — Total $ 71,830 $ 321 Average Recorded Investment Interest Income Recognized Commercial loans $ 28,109 $ 4 Construction loans 28,983 — Commercial real estate loans 14,251 405 Residential mortgage and equity lines 28 26 Total $ 71,371 $ 435 The following table presents non-accrual loans and the related allowance as of December 31, 2023 2022: As of December 31, 2023 Unpaid Principal Balance Recorded Investment Allowance (In thousands) With no allocated allowance: Commercial loans $ 26,310 $ 14,404 $ — Construction loans 7,736 7,736 — Commercial real estate loans 41,725 32,030 — Residential mortgage and equity lines 12,957 12,511 — Installment and other loans — — — Subtotal $ 88,728 $ 66,681 $ — With allocated allowance: Commercial loans $ — $ — $ — Commercial real estate loans — — — Residential mortgage and equity lines — — — Subtotal $ — $ — $ — Total non-accrual loans $ 88,728 $ 66,681 $ — As of December 31, 2022 Unpaid Principal Balance Recorded Investment Allowance (In thousands) With no allocated allowance: Commercial loans $ 27,341 $ 12,949 $ — Commercial real estate loans 37,697 32,205 — Residential mortgage and equity lines 9,626 8,978 Installment and other loans 9 8 — Subtotal $ 74,673 $ 54,140 $ — With allocated allowance: Commercial loans $ 14,643 $ 12,823 $ 3,734 Commercial real estate loans 1,896 1,891 207 Subtotal $ 16,539 $ 14,714 $ 3,941 Total non-accrual loans $ 91,212 $ 68,854 $ 3,941 The following table is a summary of non-accrual loans as of December 31, 2023, 2022, 2021 As of December 31, 2023 2022 2021 (In thousands) Non-accrual portfolio loans $ 66,681 $ 68,854 $ 65,846 Contractual interest due 6,270 4,620 4,032 Interest recognized 321 435 1,074 Net interest foregone $ 5,949 $ 4,185 $ 2,958 The following tables present the aging of the loan portfolio by type as of December 31, 2023, December 31, 2022: As of December 31, 2023 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Non-accrual Loans Total Past Due Loans Not Past Due Total Type of Loans: (In thousands) Commercial loans $ 11,771 $ 7,770 $ 508 $ 14,404 $ 34,453 $ 3,270,595 $ 3,305,048 Construction loans 25,389 22,998 — 7,736 56,123 366,524 422,647 Commercial real estate loans 27,900 1,503 6,649 32,030 68,082 9,661,499 9,729,581 Residential mortgage loans and equity lines 59,606 6,670 — 12,511 78,787 6,005,879 6,084,666 Installment and other loans 32 — — — 32 6,166 6,198 Total loans $ 124,698 $ 38,941 $ 7,157 $ 66,681 $ 237,477 $ 19,310,663 $ 19,548,140 As of December 31, 2022 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Non-accrual Loans Total Past Due Loans Not Past Due Total Type of Loans: (In thousands) Commercial loans $ 8,192 $ 3,235 $ 10,208 $ 25,772 $ 47,407 $ 3,271,371 $ 3,318,778 Construction loans — — — — — 559,372 559,372 Commercial real estate loans 25,772 — 1,372 34,096 61,240 8,732,445 8,793,685 Residential mortgage loans and equity lines 47,043 5,685 — 8,978 61,706 5,515,794 5,577,500 Installment and other loans 5 1 — 8 14 4,675 4,689 Total loans $ 81,012 $ 8,921 $ 11,580 $ 68,854 $ 170,367 $ 18,083,657 $ 18,254,024 The Company has adopted ASU 2022 02, January 1, 2023. Under the new guidance on loan modifications made to borrowers experiencing financial difficulty, when a loan held for investment is modified and is considered to be a continuation of the original loan, the Company uses the post-modification contractual rate to derive the effective interest rate when using a discounted cash flow method to determine the allowance for credit loss. The amendments in this new guidance eliminate the previous TDR recognition and measurement guidance and, instead, require that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. Under the prior TDR guidance, a TDR is a formal modification of the terms of a loan when the lender, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower. The concessions may six The allowance for credit loss on a TDR was measured using the same method as all other loans held for investment, except when the value of a concession could not Upon adoption of ASU 2022 02, not 2022 02 If economic conditions or other factors worsen relative to the assumptions the Company utilized, the expected loan losses will increase accordingly in future periods. As of December 31, 2022, December 31, 2022, zero The following table presents TDRs that were modified during 2022, December 31, 2022, 2022: Loans Modified as TDRs During the Year Ended December 31, 2022 No. of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve Charge-offs (Dollars in thousands) Commercial loans 4 $ 6,115 $ 6,115 $ 427 $ — Commercial real estate loans 3 3,676 3,669 — — Residential mortgage and equity lines 8 2,189 2,162 — — Total 15 $ 11,980 $ 11,946 $ 427 $ — The following table presents TDRs that were modified during 2021, December 31, 2021, 2021: Loans Modified as TDRs During the Year Ended December 31, 2021 No. of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve (1) Charge-off (Dollars in thousands) Commercial loans 3 $ 2,150 $ 2,150 $ — $ — Residential mortgage and equity lines 2 3 3 — — Total 5 $ 2,153 $ 2,153 $ — $ — Modifications of the loan terms in the three twelve December 31, 2023, The following table presents the amortized cost of loans modified to borrowers experiencing financial difficulty disaggregated by class of financing receivable and type of concession granted and the financial effects of the modifications for the twelve December 31, 2023 Financial Effects of Loan Modifications Payment Delay Combo-Rate Reduction/Term Extension/Payment Delay Total Modification as a % of Loan Class Weighted-Average Rate Reduction Weighted-Average Term Extension Weighted-Average Payment Deferral Loan Type Commercial loans $ — $ 2,650 $ 2,650 0.08 % 1.10 % 2.2 0.9 Residential mortgage loans 222 — 222 0.00 % 0.10 % 0.0 2.0 Total $ 222 $ 2,650 $ 2,872 The Company considers a loan to be in payment default once it is 60 to 90 days contractually past due under the modified terms. The Company tracks the performance of modified loans. A modified loan may may twelve December 31, 2023 The following table presents the performance of loans that were modified during the twelve December 31, 2023. Twelve Months Ended December 31, 2023 Current 30–89 Days Past Due 90+ Days Past Due Total (In thousands) Loan Type Commercial loans $ 2,650 $ — $ — $ 2,650 Residential mortgage loans 222 — — 222 Total $ 2,872 $ — $ — $ 2,872 A summary of TDRs by type of concession and by type of loans as of December 31, 2022, December 31, 2022 Accruing TDRs Payment Deferral Rate Reduction Rate Reduction and Payment Deferral Total (In thousands) Commercial loans $ 2,588 $ — $ — $ 2,588 Commercial real estate loans 2,791 — 5,855 8,646 Residential mortgage loans 2,181 445 1,285 3,911 Total accruing TDRs $ 7,560 $ 445 $ 7,140 $ 15,145 December 31, 2022 Non-accrual TDRs Payment Deferral Rate Reduction Rate Reduction and Payment Deferral Total (In thousands) Commercial loans $ 3,629 $ — $ — $ 3,629 Commercial real estate loans 1,098 — — 1,098 Residential mortgage loans 1,621 — — 1,621 Total non-accrual TDRs $ 6,348 $ — $ — $ 6,348 Modifications of the loan terms in the twelve December 31, 2022, three twelve We expect that the TDRs on accruing status as of December 31, 2022, The Company considers a loan to be in payment default once it is 60 to 90 days contractually past due under the modified terms. The Company did not twelve December 31, 2022. Under the Company’s internal underwriting policy, an evaluation is performed of the probability that the borrower will be in payment default on any of its debt in the foreseeable future without the modification in order to determine whether a borrower is experiencing financial difficulty. As of December 31, 2023, no As part of the on-going monitoring of the credit quality of our loan portfolio, the Company utilizes a risk grading matrix to assign a risk rating to each loan. Loans are risk rated based on analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of sources of repayment, the borrower’s current financial and liquidity status and other relevant information. The risk rating categories can be generally described by the following grouping for non-homogeneous loans: ● Pass/Watch ● Special Mention not may ● Substandard may not not ● Doubtful may ● Loss no The following table summarizes the Company’s loan held for investment as of December 31, 2023 2022, Loans Amortized Cost Basis by Origination Year December 31, 2023 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Converted to Term Loans Total (In thousands) Commercial loans Pass/Watch $ 381,705 $ 323,939 $ 326,650 $ 96,725 $ 75,281 $ 136,162 $ 1,775,162 $ 8,308 $ 3,123,932 Special Mention 4,488 4,875 8,559 23,380 — — 75,419 — 116,721 Substandard 1,752 653 9,895 2,462 763 5,775 40,131 116 61,547 Doubtful — — — — — — — — — Total $ 387,945 $ 329,467 $ 345,104 $ 122,567 $ 76,044 $ 141,937 $ 1,890,712 $ 8,424 $ 3,302,200 YTD gross write-offs $ — $ 977 $ 1,312 $ 384 $ 3,672 $ 6,044 $ 1,520 $ — $ 13,909 Construction loans Pass/Watch $ 29,550 $ 131,984 $ 153,977 $ 19,461 $ 13,298 $ 3,131 $ — $ — $ 351,401 Special Mention 1,911 — 11,707 25,389 — 22,998 — — 62,005 Substandard — — — — 7,736 — — — 7,736 Total $ 31,461 $ 131,984 $ 165,684 $ 44,850 $ 21,034 $ 26,129 $ — $ — $ 421,142 YTD gross write-offs $ — $ — $ — $ — $ — $ 4,221 $ — $ — $ 4,221 Commercial real estate loans Pass/Watch $ 2,121,489 $ 1,959,239 $ 1,585,010 $ 887,508 $ 1,019,952 $ 1,726,015 $ 184,601 $ — $ 9,483,814 Special Mention 37,604 18,910 38,405 3,499 10,303 17,210 1,384 — 127,315 Substandard — 11,870 12,170 2,965 17,293 66,205 — — 110,503 Total $ 2,159,093 $ 1,990,019 $ 1,635,585 $ 893,972 $ 1,047,548 $ 1,809,430 $ 185,985 $ — $ 9,721,632 YTD gross write-offs $ — $ — $ 208 $ — $ 969 $ 4,164 $ — $ — $ 5,341 Residential mortgage loans Pass/Watch $ 1,140,998 $ 1,128,526 $ 902,613 $ 524,315 $ 541,005 $ 1,583,118 $ — $ — $ 5,820,575 Special Mention — — — 33 — 1,619 — — 1,652 Substandard 7 652 3,325 2,577 1,334 9,311 — — 17,206 Total $ 1,141,005 $ 1,129,178 $ 905,938 $ 526,925 $ 542,339 $ 1,594,048 $ — $ — $ 5,839,433 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Equity lines Pass/Watch $ — $ 98 $ — $ — $ — $ — $ 227,502 $ 16,628 $ 244,228 Special Mention — 3 — — — — — — 3 Substandard — — — — — — 2,511 173 2,684 Total $ — $ 101 $ — $ — $ — $ — $ 230,013 $ 16,801 $ 246,915 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Installment and other loans Pass/Watch $ 5,114 $ 981 $ 3 $ — $ — $ — $ — $ — $ 6,098 Total $ 5,114 $ 981 $ 3 $ — $ — $ — $ — $ — $ 6,098 YTD gross write-offs $ — $ 15 $ — $ — $ — $ — $ — $ — $ 15 Total loans $ 3,724,618 $ 3,581,730 $ 3,052,314 $ 1,588,314 $ 1,686,965 $ 3,571,544 $ 2,306,710 $ 25,225 $ 19,537,420 Total YTD gross write-offs $ — $ 992 $ 1,520 $ 384 $ 4,641 $ 14,429 $ 1,520 $ — $ 23,486 Loans Amortized Cost Basis by Origination Year December 31, 2022 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Converted to Term Loans Total (In thousands) Commercial loans Pass/Watch $ 488,748 $ 446,647 $ 180,226 $ 119,355 $ 107,896 $ 106,649 $ 1,753,509 $ 6,560 $ 3,209,590 Special Mention 1,212 4,696 2,818 68 308 4,354 41,110 — 54,566 Substandard 25 12,750 342 4,859 2,766 6,985 22,084 133 49,944 Doubtful — — — 1,504 2,185 — 234 — 3,923 Total $ 489,985 $ 464,093 $ 183,386 $ 125,786 $ 113,155 $ 117,988 $ 1,816,937 $ 6,693 $ 3,318,023 YTD gross write-offs $ 96 $ 587 $ 120 $ 71 $ 1,786 $ 360 $ 202 $ — $ 3,222 Construction loans Pass/Watch $ 99,798 $ 264,197 $ 113,312 $ 20,479 $ 3,067 $ — $ — $ — $ 500,853 Special Mention — 360 9,449 11,643 22,945 — — — 44,397 Substandard — — — 1,736 9,309 — — — 11,045 Total $ 99,798 $ 264,557 $ 122,761 $ 33,858 $ 35,321 $ — $ — $ — $ 556,295 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate loans Pass/Watch $ 2,087,650 $ 1,728,607 $ 975,953 $ 1,094,505 $ 908,748 $ 1,420,982 $ 178,116 $ — $ 8,394,561 Special Mention 22,150 57,015 25,593 32,119 17,999 63,782 1,600 — 220,258 Substandard 12,320 7,861 14,392 19,972 34,899 81,844 2,631 — 173,919 Total $ 2,122,120 $ 1,793,483 $ 1,015,938 $ 1,146,596 $ 961,646 $ 1,566,608 $ 182,347 $ — $ 8,788,738 YTD gross write-offs $ — $ — $ — $ — $ 2,152 $ — $ — $ — $ 2,152 Residential mortgage loans Pass/Watch $ 1,228,391 $ 964,799 $ 580,990 $ 600,786 $ 417,565 $ 1,444,320 $ — $ — $ 5,236,851 Special Mention — — 33 — 752 905 — — 1,690 Substandard 206 762 2,028 1,966 1,799 8,785 — — 15,546 Total $ 1,228,597 $ 965,561 $ 583,051 $ 602,752 $ 420,116 $ 1,454,010 $ — $ — $ 5,254,087 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Equity lines Pass/Watch $ 731 $ — $ — $ — $ — $ — $ 302,825 $ 21,460 $ 325,016 Special Mention 5 — — — — — — — 5 Substandard 12 — — — — — 1,043 220 1,275 Total $ 748 $ — $ — $ — $ — $ — $ 303,868 $ 21,680 $ 326,296 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Installment and other loans Pass/Watch $ 1,792 $ 2,152 $ — $ — $ — $ — $ — $ — $ 3,944 Total $ 1,792 $ 2,152 $ — $ — $ — $ — $ — $ — $ 3,944 YTD gross write-offs $ 116 $ — $ — $ — $ — $ — $ — $ — $ 116 Total loans $ 3,943,040 $ 3,489,846 $ 1,905,136 $ 1,908,992 $ 1,530,238 $ 3,138,606 $ 2,303,152 $ 28,373 $ 18,247,383 Total YTD gross write-offs $ 212 $ 587 $ 120 $ 71 $ 3,938 $ 360 $ 202 $ — $ 5,490 Revolving loans that are converted to term loans presented in the table above are excluded from the term loans by vintage year columns. The following table details activity in the allowance for loan losses by portfolio segment for the years ended December 31, 2023, 2022. one not Commercial Residential Installment Commercial Construction Real Estate Mortgage and Other Loans Loans Loans and Equity Lines Loans Total Allowance for loan losses (In thousands) 2021 Ending Balance $ 43,394 $ 6,302 $ 61,081 $ 25,379 $ 1 $ 136,157 Provision/(reversal) for expected credit losses 6,798 4,109 9,079 (7,221 ) 148 12,913 Charge-offs (3,222 ) — (2,152 ) — (116 ) (5,490 ) Recoveries 2,465 6 358 74 2 2,905 Net (Charge-offs)/Recoveries $ (757 ) $ 6 $ (1,794 ) $ 74 $ (114 ) $ (2,585 ) 2022 Ending Balance $ 49,435 $ 10,417 $ 68,366 $ 18,232 $ 35 $ 146,485 Provision/(reversal) for expected credit losses 15,275 1,984 8,570 (177 ) 3 25,655 Charge-offs (13,909 ) (4,221 ) (5,341 ) — (15 ) (23,486 ) Recoveries 2,990 — 2,833 85 — 5,908 Net (Charge-offs)/Recoveries $ (10,919 ) $ (4,221 ) $ (2,508 ) $ 85 $ (15 ) $ (17,578 ) 2023 Ending Balance $ 53,791 $ 8,180 $ 74,428 $ 18,140 $ 23 $ 154,562 Allowance for unfunded credit commitments, 2021 Ending Balance $ 3,725 $ 3,375 $ — $ — $ — $ 7,100 Provision for expected credit losses 1,115 515 — — — 1,630 Allowance for unfunded credit commitments 2022 Ending Balance $ 4,840 $ 3,890 $ — $ — $ — $ 8,730 Provision/(reversal) for expected credit losses 2,048 (1,725 ) — — — 323 Allowance for unfunded credit commitments 2023 Ending Balance $ 6,888 $ 2,165 $ — $ — $ — $ 9,053 Residential mortgage loans in process of formal foreclosure proceedings were $242 thousand as of December 31, 2023, December 31, 2022.

Note 6 - Investments in Afforda

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Investments in Affordable Housing [Text Block]	6. Investments in Affordable Housing and Alternative Energy Partnerships The Company holds ownership interests in a number of limited partnerships that were formed to develop and operate housing for lower-income tenants throughout the United States and alternative energy partnerships that qualify for energy tax credits. The Company evaluates its interests in these partnerships to determine whether they meet the definition of a Variable Interest Entity (“VIE”) and whether the Company is required to consolidate these entities. A VIE is consolidated by its primary beneficiary, which is the party that has both (i) the power to direct the activities that most significantly impact the economic performance of the VIE and (ii) a variable interest that could potentially be significant to the VIE. To determine whether or not 810, not eleven not not not The investment in these entities approximates the maximum exposure to loss as a result of the Company’s involvement with these unconsolidated entities. The balance of the Company’s investments in these entities was $315.7 million and $327.1 million as of December 31, 2023, 2022, The Company’s investments in these partnerships, net, are presented in the table below: As of December 31, 2023 2022 (In thousands) Investments in affordable housing partnerships, net $ 295,740 $ 289,920 Other borrowings for affordable housing limited partnerships $ 15,787 $ 22,600 Investments in affordable housing and alternative energy partnerships, unfunded commitments $ 106,452 $ 133,491 Investments in alternative energy tax credit partnerships, net $ 19,943 $ 37,208 As of December 31, 2023, eleven December 31, 2023, December 31, 2022. December 31, 2023 2022, December 31, 2023 2022, As of December 31, 2023, Amount Year Ending December 31, (In thousands) 2024 $ 49,810 2025 $ 34,871 2026 $ 15,194 2027 $ 1,400 2028 $ 1,019 Thereafter $ 4,158 Total unfunded commitments $ 106,452 Each of the partnerships must meet regulatory requirements for affordable housing and alternative energy projects, including long-term minimum compliance periods (such as a 15 may not December 31, 2023. not three not 2023 2022, The following table summarizes the Company’s usage of affordable housing and other tax credits including energy tax credits. As of December 31, 2023 2022 2021 (In thousands) Affordable housing and other tax credits recognized $ 32,395 $ 29,524 $ 26,459 Alternative energy tax credits recognized $ 41,320 $ 4,707 $ 6,337

Note 7 - Premises and Equipment

Note 7 - Premises and Equipment	12 Months Ended
Note 7 - Premises and Equipment	Dec. 31, 2023
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	7. Premises and Equipment Premises and equipment consisted of the following as of December 31, 2023, December 31, 2022: As of December 31, 2023 2022 (In thousands) Land and land improvements $ 42,566 $ 42,566 Building and building improvements 81,796 81,613 Furniture, fixtures and equipment 68,371 65,872 Leasehold improvement 18,056 18,009 Construction in process 941 375 211,730 208,435 Less: Accumulated depreciation 120,633 113,659 Premises and equipment, net $ 91,097 $ 94,776 The amount of depreciation included in operating expense was $7.1 million, $8.0 million and $7.7 million for the years ended December 31, 2023, 2022 2021,

Note 8 - Goodwill and Other Int

Note 8 - Goodwill and Other Intangible Assets	12 Months Ended
Note 8 - Goodwill and Other Intangible Assets	Dec. 31, 2023
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	8. Goodwill. December 31, 2023 2022. 1 not December 31, 2023 2022. Core Deposit Intangibles. 2022. December 31, 2023 2022: December 31, 2023 2022 (In thousands) Gross balance $ 10,562 $ 10,562 Accumulated amortization (5,291 ) (4,291 ) Impairment (1,227 ) (918 ) Net carrying balance $ 4,044 $ 5,353 There were $1.2 million and $918 thousand in impairment write-downs on core deposit intangibles for the year ended December 31, 2023 2022, December 31, 2021. The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the core deposit intangible assets was $1.3 million, $1.9 million and $687 thousand for the years ended December 31, 2023, 2022 2021, Amount (In thousands) 2024 $ 1,001 2025 $ 947 2026 $ 870 2027 $ 870 thereafter $ 356 Total $ 4,044

Note 9 - Deposits

Note 9 - Deposits	12 Months Ended
Note 9 - Deposits	Dec. 31, 2023
Notes to Financial Statements
Deposit Liabilities Disclosures [Text Block]	9. Deposits The following table displays deposit balances as of December 31, 2023, December 31, 2022: As of December 31, 2023 2022 (In thousands) Deposits Non-interest-bearing demand deposits $ 3,529,018 $ 4,168,989 Interest bearing demand deposits 2,370,685 2,509,736 Money market deposits 3,049,754 3,812,724 Savings deposits 1,039,203 1,000,460 Time deposits 9,336,787 7,013,370 Total deposits $ 19,325,447 $ 18,505,279 Time deposits outstanding as of December 31, 2023, Expected Maturity Date at December 31, 2024 2025 2026 2027 2028 Thereafter Total (In thousands) Time deposits $ 9,312,877 $ 18,429 $ 3,203 $ 2,230 $ 23 $ 25 $ 9,336,787 Accrued interest payable on client deposits was $28.6 million, $13.2 million, and $1.7 million as of December 31, 2023, 2022 2021, December 31, 2023, 2022, 2021: Year Ended December 31, 2023 2022 2021 (In thousands) Interest bearing demand $ 40,952 $ 8,176 $ 2,249 Money market accounts 86,097 39,913 18,241 Saving accounts 8,916 853 769 Time deposits 331,997 56,354 40,542 Total $ 467,962 $ 105,296 $ 61,801 The aggregate amount of domestic time deposits in denominations that meet or exceed the current FDIC insurance limit of $250 December 31, 2023, 2022, December 31, 2023, 2022, $250

Note 10 - Borrowed Funds

Note 10 - Borrowed Funds	12 Months Ended
Note 10 - Borrowed Funds	Dec. 31, 2023
Notes to Financial Statements
Debt Disclosure [Text Block]	10. Borrowed Funds There were no outstanding securities sold or entered into under agreements to repurchase at December 31, 2023, 2022 2021. Securities sold under agreements to repurchase, if any, are accounted for as collateralized financing transactions and recorded at the amounts at which the securities were sold. As of December 31, 2023, 2023 2022. December 31, 2023, December 31, 2022. December 31, 2023, January 2024 September 2024. December 31, 2023 December 31, 2023 Other Liabilities. November 23, 2004, December 31, 2005, January 1 first first seventh 2004 November 23, 2014, ten March 13, 2014, December 31, 2013 January 1 first first seventh March 28, 2019, five The balance of deferred bonuses was $2.4 million and $2.3 million at December 31, 2023, 2022, 2023, 2022, 2021. We established three 2003 two 2007 twenty may not, As of December 31, 2023 2022, December 31, 2023, 2022 2021, 2022 2023 2022.

Note 11 - Capital Resources

Note 11 - Capital Resources	12 Months Ended
Note 11 - Capital Resources	Dec. 31, 2023
Notes to Financial Statements
Equity [Text Block]	11. Capital Resources Total equity was $2.74 billion as of December 31, 2023, December 31, 2022, 2023, 2022, 2021. On May 26th, 2022, 2022, On February 21, 2023, May 2022 first 2023, The five not not May 19, 2010, 2 May 19, 2010, $15.0 December 31, 2009, 1 December 31, 2023, 2022, $15.0 no 1 The table below summarizes the outstanding Junior Subordinated Notes issued by the Company to each trust as of December 31, 2023 2022: As of December 31, 2023 Principal Not Annualized Current Date of Payable/ Issuance Balance of Redeemable Stated Coupon Interest Rate Distribution Trust Name Date Notes Until Maturity Rate Rate Change Date (Dollars in thousands) Cathay Capital Trust I June 26, $ 20,619 June 30, June 30, 3-month 8.81 % December 29, March 30 2003 2008 2033 SOFR 2023 June 30 + 3.15% September 30 + 0.26161% December 30 Cathay Statutory Trust I September 17, 20,619 September 17, September 17, 3-month 8.67 % December 17, March 17 2003 2008 2033 SOFR 2023 June 17 + 3.00% September 17 + 0.26161% December 17 Cathay Capital Trust II December 30, 12,887 March 30, March 30, 3-month 8.56 % December 29, March 30 2003 2009 2034 SOFR 2023 June 30 + 2.90% September 30 + 0.26161% December 30 Cathay Capital Trust III March 28, 46,392 June 15, June 15, 3-month 7.15 % December 14, March 15 2007 2012 2037 SOFR 2023 June 15 + 1.48% September 15 + 0.26161% December 15 Cathay Capital Trust IV May 31, 18,619 September 6, September 6, 3-month 7.06 % December 5, March 6 2007 2012 2037 SOFR 2023 June 6 + 1.40% September 6 Total Junior Subordinated Notes $ 119,136 As of December 31, 2022 Principal Not Annualized Current Date of Payable/ Issuance Balance of Redeemable Stated Coupon Interest Rate Distribution Trust Name Date Notes Until Maturity Rate Rate Change Date (Dollars in thousands) Cathay Capital Trust I June 26, $ 20,619 June 30, June 30, 3-month 6.82 % December 29, March 30 2003 2008 2033 LIBOR 2022 June 30 + 3.15% September 30 December 30 Cathay Statutory Trust I September 17, 20,619 September 17, September 17, 3-month 6.53 % December 18, March 17 2003 2008 2033 LIBOR 2022 June 17 + 3.00% September 17 December 17 Cathay Capital Trust II December 30, 12,887 March 30, March 30, 3-month 6.57 % December 29, March 30 2003 2009 2034 LIBOR 2022 June 30 + 2.90% September 30 December 30 Cathay Capital Trust III March 28, 46,392 June 15, June 15, 3-month 4.77 % December 14, March 15 2007 2012 2037 LIBOR 2022 June 15 + 1.48% September 15 December 15 Cathay Capital Trust IV May 31, 18,619 September 6, September 6, 3-month 4.54 % December 5, March 6 2007 2012 2037 LIBOR 2022 June 6 + 1.4% September 6 December 6 Total Junior Subordinated Notes $ 119,136

Note 12 - Income Taxes

Note 12 - Income Taxes	12 Months Ended
Note 12 - Income Taxes	Dec. 31, 2023
Notes to Financial Statements
Income Tax Disclosure [Text Block]	12. Income Taxes For the years ended December 31, 2023, 2022, 2021, Year Ended December 31, 2023 2022 2021 (In thousands) Current: Federal $ 5,428 $ 57,029 $ 29,955 State 48,812 56,953 44,416 Total Current $ 54,240 $ 113,982 $ 74,371 Deferred: Federal $ (1,676 ) $ (1,776 ) $ 5,986 State (3,106 ) (312 ) 3,182 Total Deferred $ (4,782 ) $ (2,088 ) $ 9,168 Total income tax expense $ 49,458 $ 111,894 $ 83,539 Temporary differences between the amounts reported in the financial statements and the tax basis of assets and liabilities give rise to deferred taxes. Net deferred tax assets as of December 31, 2023 2022, As of December 31, 2023 2022 (In thousands) Deferred Tax Assets Loan loss allowance $ 50,126 $ 47,673 Accrual for bonuses 4,636 2,591 Non-accrual interest 2,164 1,572 Write-down on equity securities and venture capital investments 2,018 1,975 Depreciation and amortization 765 — State tax 5,693 6,251 Unrealized loss on securities available-for-sale, net 31,728 40,400 Tax credits carried forward 9,136 9,136 Net operating loss carried forward 3,787 5,916 Other, net 7,632 4,711 Gross deferred tax assets $ 117,685 $ 120,225 Deferred Tax Liabilities Deferred loan costs $ (9,687 ) $ (10,025 ) Depreciation and amortization — (2,856 ) Unrealized gain on interest rate swaps (838 ) (1,364 ) Unrealized gain on equity securities (4,863 ) — Dividends on Federal Home Loan Bank common stock (977 ) (981 ) Other, net (3,916 ) (3,506 ) Gross deferred tax liabilities $ (20,281 ) $ (18,732 ) Net deferred tax assets $ 97,404 $ 101,493 Amounts for the current year are based upon estimates and assumptions and could vary from amounts shown on the tax returns as filed. As of December 31, 2023, 382 December 31, 2023, 382 $10.2 2021 $8.8 2022 $7.3 not 2030. December 31, 2023, not 2028. In assessing the realization of deferred tax assets, management considers whether it is more likely than not not not The Company had current income tax receivables of $33.7 million as of December 31, 2023, December 31, 2022. 2023 2022. The Company’s tax returns are open for audits by the Internal Revenue Service back to 2020 2019. 2020. twelve not Income tax expense results in effective tax rates that differ from the statutory federal income tax rate for the years indicated as follows: Year Ended December 31, 2023 2022 2021 (Dollars in thousands) Tax provision at Federal statutory rate $ 84,752 21.0 % $ 99,233 21.0 % $ 80,187 21.0 % State income taxes, net of Federal income tax benefit 36,107 9.0 44,837 9.5 37,602 9.8 Excess deduction for stock option and RSUs (586 ) (0.1 ) (140 ) — (20 ) — Low income housing and other tax credits (73,715 ) (18.3 ) (34,231 ) (7.2 ) (32,795 ) (8.6 ) Other, net 2,900 0.7 2,195 0.4 (1,435 ) (0.3 ) Total income tax expense $ 49,458 12.3 % $ 111,894 23.7 % $ 83,539 21.9 %

Note 13 - Stockholders' Equity

Note 13 - Stockholders' Equity and Earnings Per Share	12 Months Ended
Note 13 - Stockholders' Equity and Earnings Per Share	Dec. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	13. Stockholders Equity and Earnings per Share As a bank holding company, the Bancorp’s ability to pay dividends will depend upon the dividends it receives from the Bank and on the income it may may Under California banking law, the Bank may not, three December 31, 2023, December 31,2022. Activity in accumulated other comprehensive income, net of tax, and reclassification out of accumulated other comprehensive income for the years ended December 31, 2023, 2022 2023 2022 Pre-tax Tax expense/ (benefit) Net-of-tax Pre-tax Tax expense/ (benefit) Net-of-tax Beginning balance, loss, net of tax (In thousands) Securities available-for-sale $ (104,832 ) $ 211 Cash flow hedge derivatives 2,537 (3,276 ) Total $ (102,295 ) $ (3,065 ) Net unrealized gains/(losses) arising during the period Securities available-for-sale $ 24,315 $ 7,786 $ 16,529 $ (149,124 ) $ (44,081 ) $ (105,043 ) Cash flow hedge derivatives (2,503 ) (740 ) (1,763 ) 10,864 3,211 7,653 Total 21,812 7,046 14,766 (138,260 ) (40,870 ) (97,390 ) Reclassification adjustment for net gains/(losses) in net income Securities available-for-sale 3,000 887 2,113 — — — Cash flow hedge derivatives — — — (2,612 ) (772 ) (1,840 ) Total 3,000 887 2,113 (2,612 ) (772 ) (1,840 ) Total other comprehensive income/(loss) Securities available-for-sale 27,315 8,673 18,642 (149,124 ) (44,081 ) (105,043 ) Cash flow hedge derivatives (2,503 ) (740 ) (1,763 ) 8,252 2,439 5,813 Total $ 24,812 $ 7,933 $ 16,879 $ (140,872 ) $ (41,642 ) $ (99,230 ) Ending balance, gain/(loss), net of tax Securities available-for-sale $ (86,190 ) $ (104,832 ) Cash flow hedge derivatives 774 2,537 Total $ (85,416 ) $ (102,295 ) The Board of Directors of the Bancorp is authorized to issue preferred stock in one may may may no The following is the reconciliation of the numerators and denominators of the basic and diluted earnings per share computations for the years as indicated: Year Ended December 31, 2023 2022 2021 Per Per Per Income Shares Share Income Shares Share Income Shares Share (Numerator) (Denominator) Amount (Numerator) (Denominator) Amount (Numerator) (Denominator) Amount (In thousands, except shares and per share data) Net income $ 354,124 $ 360,642 $ 298,304 Basic EPS, income $ 354,124 72,573,025 $ 4.88 $ 360,642 74,337,265 $ 4.85 $ 298,304 78,268,369 $ 3.81 Effect of dilutive stock options and RSU 289,603 327,470 302,269 Diluted EPS, income $ 354,124 72,862,628 $ 4.86 $ 360,642 74,664,735 $ 4.83 $ 298,304 78,570,638 $ 3.80

Note 14 - Commitments and Conti

Note 14 - Commitments and Contingencies	12 Months Ended
Note 14 - Commitments and Contingencies	Dec. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	14. Commitments and Contingencies Legal Proceedings. not In accordance with ASC 450, may not may Lending not The Company’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Unless noted otherwise, the Company does not Financial instruments for which contract amounts represent the amount of credit risk include the following: As of December 31, 2023 2022 (In thousands) Commitments to extend credit $ 3,808,619 $ 3,630,304 Standby letters of credit 368,618 315,821 Commercial letters of credit 11,308 29,416 Total $ 4,188,545 $ 3,975,541 Commitments to extend credit are agreements to lend to a client provided there is no not As of December 31, 2023, not no As of December 31, 2023, December 31, 2022 Commercial letters of credit and bill of lading guarantees are issued to facilitate domestic and foreign trade transactions while standby letters of credit are issued to make payments on behalf of clients if certain specified future events occur. The credit risk involved in issuing letters of credit and bill of lading guarantees is essentially the same as that involved in making loans to clients.

Note 15 - Leases

Note 15 - Leases	12 Months Ended
Note 15 - Leases	Dec. 31, 2023
Notes to Financial Statements
Lessee, Operating Leases [Text Block]	15. Leases The Company enters into operating leases in the normal course of business primarily for branch offices, office spaces and certain equipment. The Company may ROU assets and lease liabilities are recognized at the lease commencement date based on the estimated present value of the lease payments over the lease term. The Company uses its incremental borrowing rate to determine the present value of its lease liabilities. The Company has elected to not not 12 not December 31, 2023 2022. The following table represents the operating lease amounts reported on the Consolidated Balance Sheets and other supplemental information as of December 31, 2023, December 31, 2022: December 31, 2023 December 31, 2022 (Dollars in millions) Operating Leases: ROU assets $ 32.1 $ 29.6 Lease liabilities $ 34.8 $ 32.5 Weighted-average remaining lease term (in years) 4.1 4.0 Weighted-average discount rate 3.8 % 2.9 % Operating cash flows from operating leases $ 11.4 $ 11.4 ROU assets obtained in exchange for lease obligations $ 12.6 $ 5.9 Operating lease expense is recognized on a straight-line basis over the lease term. Operating lease expense was $12.8 million, $13.1 million and $11.6 million for the years ended December 31, 2023, 2022 2021, The following table presents a maturity analysis of the Company’s operating lease liabilities as of December 31, 2023: As of December 31, 2023 Operating Leases (In thousands) 2024 $ 10,800 2025 8,960 2026 7,297 2027 5,238 2028 3,916 Thereafter 1,403 Total lease payments $ 37,614 Less amount of payment representing interest (2,817 ) Total present value of lease payments $ 34,797

Note 16 - Financial Derivatives

Note 16 - Financial Derivatives	12 Months Ended
Note 16 - Financial Derivatives	Dec. 31, 2023
Notes to Financial Statements
Derivative Instruments and Hedging Activities Disclosure [Text Block]	16. Financial Derivatives The Company does not may may may The Company follows ASC Topic 815 not third not The Company offers various interest rate derivative contracts to its clients. When derivative transactions are executed with its clients, the derivative contracts are offset by paired trades with third not not third December 31, 2023 2022, third third December 31, 2022, In May 2014, ten five ten June 2014 June 2024, three 2022 December 31, 2022 December 31, 2022, not December 31, 2022. As of December 31, 2023 2022, three ten December 31, 2023, 2022, not The Company has designated as a partial-term hedging election $1.07 billion and $669.7 million notional with a fair value of $3.8 million and $32.0 million as last-of-layer hedge on pools of loans with a notational value of $1.78 billion and $1.21 billion as of December 31, 2023 2022, not 1 December 31, 2023 2022, Interest rate swap contracts involve the risk of dealing with institutional derivative counterparties and their ability to meet contractual terms. Institutional counterparties must have a strong credit profile and be approved by the Company’s Board of Directors. The Company’s credit exposure on interest rate swaps is limited to the net favorable value and interest payments of all swaps by each counterparty. Credit exposure may The notional amount and net unrealized loss of the Company’s fair value derivative financial instruments as of December 31, 2023, December 31, 2022, December 31, 2023 December 31, 2022 Fair value swap hedges: ($ in thousands) Notional $ 1,156,007 $ 874,034 Weighted average fixed rate-pay 2.01 % 2.12 % Weighted average variable rate spread 0.32 % 0.68 % Weighted average variable rate-received 5.41 % 2.61 % Net gain/(loss) (1) $ 7,935 $ 38,589 Year ended December 31, 2023 December 31, 2022 Periodic net settlement of SWAPs (2) $ 29,514 $ 3,107 ( 1 ( 2 Included in the total notional amount of $1.16 billion and $874.0 million of the fair value interest rate contracts entered into with financial counterparties as of December 31, 2023 2022, December 31, 2023 2022, The Company enters into foreign exchange forward contracts with various counterparties to mitigate the risk of fluctuations in foreign currency exchange rates for foreign exchange certificates of deposit or foreign exchange contracts entered into with our clients. These contracts are not The notional amount and fair value of the Company’s derivative financial instruments not December 31, 2023, December 31, 2022, Derivative financial instruments December 31, 2023 December 31, 2022 not designated as hedging instruments: (In thousands) Notional amounts: Option contracts $ — $ — Forward, and swap contracts with positive fair value $ 775,324 $ 668,422 Forward, and swap contracts with negative fair value $ 752,250 $ 765,639 Fair value: Forward, and swap contracts with positive fair value $ 39,010 $ 50,467 Forward, and swap contracts with negative fair value $ (38,807 ) $ (50,962 )

Note 17 - Fair Value Measuremen

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Fair Value Disclosures [Text Block]	17. Fair Value Measurements and Fair Value of Financial Instruments The Company uses fair value to measure certain assets and liabilities on a recurring basis, primarily securities available for-sale and derivatives. For assets measured at the lower of cost or fair value, the fair value measurement criteria may may not The Company used valuation methodologies to measure assets at fair value under ASC Topic 820 825, 2016 01 2018 03, not one three ● Level 1 ● Level 2 not not ● Level 3 The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements as follows: Financial assets and liabilities measured at fair value on a recurring basis The Company uses the following methodologies to measure the fair value of its financial assets and liabilities on a recurring basis: Securities Available for Sale and Equity Securities 1 2 Warrants 3 Currency Option Contracts and Foreign Exchange Contracts 2 Interest Rate Swaps third 2 The following tables present the Company’s hierarchy for its assets and liabilities measured at fair value on a recurring basis as of December 31, 2023, December 31, 2022: As of December 31, 2023 Fair Value Measurements Using Total at Level 1 Level 2 Level 3 Fair Value Assets (In thousands) Securities available-for-sale U.S. Treasury securities $ 495,300 $ — $ — $ 495,300 U.S. government agency entities — 48,169 — 48,169 U.S. government sponsored entities — — — — Mortgage-backed securities — 786,723 — 786,723 Collateralized mortgage obligations — 28,044 — 28,044 Corporate debt securities — 246,334 — 246,334 Total securities available-for-sale 495,300 1,109,270 — 1,604,570 Equity securities Mutual funds 5,585 — — 5,585 Preferred stock of government sponsored entities 1,821 — — 1,821 Other equity securities 33,000 — — 33,000 Total equity securities 40,406 — — 40,406 Warrants — — — — Interest rate swaps — 54,268 — 54,268 Foreign exchange contracts 379 — 379 Total assets $ 535,706 $ 1,163,917 $ — $ 1,699,623 Liabilities Interest rate swaps $ — $ 45,762 $ — $ 45,762 Foreign exchange contracts — 175 — 175 Total liabilities $ — $ 45,937 $ — $ 45,937 As of December 31, 2022 Fair Value Measurements Using Total at Level 1 Level 2 Level 3 Fair Value Assets (In thousands) Securities available-for-sale U.S. Treasury securities $ 240,500 $ — $ — $ 240,500 U.S. government agency entities — 63,610 — 63,610 U.S. government sponsored entities — 30,000 — 30,000 Mortgage-backed securities — 867,094 — 867,094 Collateralized mortgage obligations — 31,061 — 31,061 Corporate debt securities — 241,083 — 241,083 Total securities available-for-sale 240,500 1,232,848 — 1,473,348 Equity securities Mutual funds 5,509 — — 5,509 Preferred stock of government sponsored entities 1,289 — — 1,289 Other equity securities 15,360 — — 15,360 Total equity securities 22,158 — — 22,158 Warrants — — 50 50 Interest rate swaps — 44,443 — 44,443 Foreign exchange contracts — 448 — 448 Total assets $ 262,658 $ 1,277,739 $ 50 $ 1,540,447 Liabilities Interest rate swaps $ — $ 51,864 $ — $ 51,864 Foreign exchange contracts — 942 — 942 Total liabilities $ — $ 52,806 $ — $ 52,806 Assets measured at estimated fair value on a non-recurring basis. Certain assets or liabilities are required to be measured at estimated fair value on a nonrecurring basis subsequent to initial recognition. Generally, these adjustments are the result of lower-of-cost-or-fair value or other impairment write-downs of individual assets. In determining the estimated fair values during the period, the Company determined that substantially all the changes in estimated fair value were due to declines in market conditions versus instrument specific credit risk. For the year ended December 31, 2023, December 31, 2022, no For financial assets measured at fair value on a nonrecurring basis that were still reflected in the Consolidated Balance Sheets as of December 31, 2023, 2022, December 31, 2023, December 31, 2022, As of December 31, 2023 Total Losses Fair Value Measurements Using Total at For the Twelve Months Ended Level 1 Level 2 Level 3 Fair Value December 31, 2023 December 31, 2022 Assets (In thousands) Non-accrual loans by type: Commercial loans $ — $ — $ 191 $ 191 $ — $ 1,786 Commercial real estate loans — — 6,882 6,882 4,069 2,091 Total non-accrual loans — — 7,073 7,073 4,069 3,877 Other real estate owned (1) — — 20,446 20,446 — — Investments in venture capital — — 237 237 227 268 Total assets $ — $ — $ 27,756 $ 27,756 $ 4,296 $ 4,145 ( 1 As of December 31, 2022 Total Losses Fair Value Measurements Using Total at For the Twelve Months Ended Level 1 Level 2 Level 3 Fair Value December 31, 2022 December 31, 2021 Assets (In thousands) Non-accrual loans by type: Commercial loans $ — $ — $ 12,950 $ 12,950 $ 1,786 $ 1,012 Commercial real estate loans — — 32,205 32,205 2,091 — Residential mortgage and equity lines — — 8,978 8,978 — — Installment and other loans — — 8 8 — — Total non-accrual loans — — 54,141 54,141 3,877 1,012 Other real estate owned (1) — — 4,328 4,328 — 17 Investments in venture capital — — 689 689 268 143 Total assets $ — $ — $ 59,158 $ 59,158 $ 4,145 $ 1,172 ( 1 The significant unobservable (Level 3 twelve The fair value of individually evaluated loans is calculated based on the net realizable fair value of the collateral or the observable market price of the most recent sale or quoted price from loans held for sale. The Company does not 2 3 The significant unobservable inputs (Level 3 The significant unobservable inputs in the Black-Scholes option pricing model for the fair value of warrants are the expected life of warrant ranging from one six December 31, 2022. December 31, 2023. Fair value is estimated in accordance with ASC Topic 825. not one no The following tables present carrying amounts and estimated fair values of certain financial instruments as of the dates indicated: December 31, 2023 December 31, 2022 Carrying Carrying Amount Fair Value Amount Fair Value (In thousands) Financial Assets Cash and due from banks $ 173,988 $ 173,988 $ 195,440 $ 195,440 Short-term investments 654,813 654,813 966,962 966,962 Securities available-for-sale 1,604,570 1,604,570 1,473,348 1,473,348 Loans, net 19,382,858 19,605,152 18,100,898 17,944,588 Equity securities 40,406 40,406 22,158 22,158 Investment in Federal Home Loan Bank stock 17,746 17,746 17,250 17,250 Warrants — — 50 50 Notional Notional Amount Fair Value Amount Fair Value Foreign exchange contracts $ 124,452 $ 379 $ 72,996 $ 448 Interest rate swaps 1,406,879 54,268 817,615 44,443 Financial Liabilities Carrying Carrying Amount Fair Value Amount Fair Value Deposits $ 19,325,447 $ 19,347,070 $ 18,505,279 $ 18,572,387 Advances from Federal Home Loan Bank 540,000 536,996 485,000 482,737 Other borrowings 15,787 13,978 22,600 18,385 Long-term debt 119,136 72,304 119,136 68,231 Notional Notional Amount Fair Value Amount Fair Value Foreign exchange contracts 101,378 175 170,213 942 Interest rate swaps 1,078,880 45,762 595,426 51,864 Notional Notional Amount Fair Value Amount Fair Value Off-Balance Sheet Financial Instruments Commitments to extend credit $ 3,808,620 $ (14,344 ) $ 3,630,304 $ (14,797 ) Standby letters of credit 368,618 (2,821 ) 315,821 (2,738 ) Other letters of credit 11,308 (10 ) 29,416 (33 ) The following tables present the level in the fair value hierarchy for the estimated fair values of certain financial instruments as of December 31, 2023, December 31, 2022. As of December 31, 2023 Estimated Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) Financial Assets Cash and due from banks $ 173,988 $ 173,988 $ — $ — Short-term investments 654,813 654,813 — — Loans, net 19,605,152 — — 19,605,152 Equity securities 40,406 40,406 — — Investment in Federal Home Loan Bank stock 17,746 — 17,746 — Warrants — — — — Financial Liabilities Deposits 19,347,070 — — 19,347,070 Advances from Federal Home Loan Bank 536,996 — 536,996 — Other borrowings 13,978 — — 13,978 Long-term debt 72,304 — 72,304 — As of December 31, 2022 Estimated Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) Financial Assets Cash and due from banks $ 195,440 $ 195,440 $ — $ — Short-term investments 966,962 966,962 — — Loans, net 17,944,588 — — 17,944,588 Equity securities 22,158 22,158 — — Investment in Federal Home Loan Bank stock 17,250 — 17,250 — Warrants 50 — — 50 Financial Liabilities Deposits 18,572,387 — — 18,572,387 Advances from Federal Home Loan Bank 482,737 — 482,737 — Other borrowings 18,385 — — 18,385 Long-term debt 68,231 — 68,231 —

Note 18 - Revenue From Contract

Note 18 - Revenue From Contracts With Clients	12 Months Ended
Note 18 - Revenue From Contracts With Clients	Dec. 31, 2023
Notes to Financial Statements
Revenue from Contract with Customer [Text Block]	18. Revenue from Contracts with Clients The Company’s revenue from contracts with clients consists primarily of service charges and fees related to deposit accounts and wealth management fees. The following is a summary of revenue from contracts with clients that are in-scope and not 606: Year Ended December 31, 2023 2022 2021 (In thousands) Non-interest income, in-scope: Fees and service charges on deposit accounts $ 9,204 $ 9,394 $ 8,618 Wealth management fees 17,506 16,436 15,056 Other service fees (1) 17,202 16,349 15,400 Total in-scope non-interest income 43,912 42,179 39,074 Noninterest income, not in-scope (2) 24,380 14,635 15,529 Total non-interest income $ 68,292 $ 56,814 $ 54,603 ( 1 ( 2 606. The major revenue streams by fee type that are within the scope of ASC 606 Fees and Services Charges on Deposit Accounts Fees and service charges on deposit accounts include charges for analysis, overdraft, cash checking, ATM, and safe deposit activities executed by our deposit clients, as well as interchange income earned through card payment networks for the acceptance of card-based transactions. Fees earned from our deposit clients are governed by contracts that provide for overall custody and access to deposited funds and other related services and can be terminated at will by either party. Fees received from deposit clients for the various deposit activities are recognized as revenue once the performance obligations are met. Wealth Management Fees The Company employs financial consultants to provide investment planning services for clients including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter end based on actual transaction details received from the broker dealer the Company engages. Practical Expedients and Exemptions The Company applies the practical expedient in ASC 606 10 50 14 not one one In addition, given the short-term nature of the Company’s contracts, the Company also applies the practical expedient in ASC 606 10 32 18 not one

Note 19 - Employee Benefit Plan

Note 19 - Employee Benefit Plans	12 Months Ended
Note 19 - Employee Benefit Plans	Dec. 31, 2023
Notes to Financial Statements
Compensation and Employee Benefit Plans [Text Block]	19. Employee Benefit Plans Employee Stock Ownership Plan. two 1,000 two not 2004 not June 17, 2004, 2023, 2022, 2021, 2023, 2022, 2021. 2023, 2022, 2021. December 31, 2023, 401 1997, 401 March 1, 1997. one 21 first may not may October 1, 2022, three three June 1, 2018, first first 30 2023, 2022, 2021. may Bank-Owned Life Insurance. December 31, 2023 2022,

Note 20 - Equity Incentive Plan

Note 20 - Equity Incentive Plans	12 Months Ended
Note 20 - Equity Incentive Plans	Dec. 31, 2023
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	20. Equity Incentive Plans Pursuant to the Company’s 2005 May 2015, may As of December 31, 2023, 2005 In addition to stock options, the Company also grants restricted stock units (“RSUs”) that are generally granted at no three one three may may Performance-based RSUs are granted at the target amount of awards. Based on the Company’s attainment of specified performance goals and consideration of market conditions, the number of shares that vest can be adjusted to a minimum of zero three Compensation costs for the time-based awards are based on the quoted market price of the Company’s stock at the grant date. Compensation costs associated with performance-based RSUs are based on grant date fair value, which considers both market and performance conditions. Compensation costs of both time-based and performance-based awards are recognized on a straight-line basis from the grant date until the vesting date of each grant. The following table presents RSU activity for 2023, 2022, 2021: Time-Based RSUs Performance-Based RSUs Weighted-Average Weighted-Average Grant Date Grant Date Shares Fair Value Shares Fair Value Balance at December 31, 2020 292,670 $ 33.37 302,802 $ 32.55 Granted 63,467 41.18 113,764 37.13 Vested (96,869 ) 41.72 (76,292 ) 41.69 Forfeited (23,324 ) 29.92 (7,768 ) 40.85 Balance at December 31, 2021 235,944 $ 32.38 332,506 $ 31.82 Granted 67,652 46.69 112,393 40.24 Vested (89,386 ) 40.92 (81,934 ) 44.52 Forfeited (12,151 ) 34.07 — — Balance at December 31, 2022 202,059 $ 33.29 362,965 $ 31.56 Granted 86,809 37.92 123,504 38.41 Vested (92,075 ) 34.29 (136,808 ) 34.21 Forfeited (2,404 ) 37.77 — — Balance at December 31, 2023 194,389 $ 34.83 349,661 $ 32.94 The compensation expense recorded for RSUs was $7.0 million in 2023, 2022, 2021. December 31, 2023, 2022, December 31, 2023,

Note 21 - Condensed Financial I

Note 21 - Condensed Financial Information of Cathay General Bancorp	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	21. Condensed Financial Information of Cathay General Bancorp The condensed financial information of the Bancorp as of December 31, 2023, December 31, 2022, December 31, 2023, 2022 2021 Balance Sheets As of December 31, 2023 2022 (In thousands, except share and per share data) Assets Cash $ 24,262 $ 14,902 Short-term certificates of deposit 335 334 Equity securities 34,441 16,360 Investment in Cathay Bank subsidiary 2,806,467 2,566,266 Investment in non-bank subsidiary 68 764 Other assets 3,896 4,385 Total assets $ 2,869,469 $ 2,603,011 Liabilities Junior subordinated debt $ 119,136 $ 119,136 Other liabilities 13,758 9,835 Total liabilities 132,894 128,971 Commitments and contingencies — — Stockholders' equity Common stock, $ 0.01 100,000,000 91,392,480 72,668,927 91,090,614 72,742,151 914 911 Additional paid-in-capital 987,953 981,119 Accumulated other comprehensive loss, net (85,416 ) (102,295 ) Retained earnings 2,500,341 2,244,855 Treasury stock, at cost ( 18,723,553 18,348,463 (667,217 ) (650,550 ) Total equity 2,736,575 2,474,040 Total liabilities and equity $ 2,869,469 $ 2,603,011 Statements of Operations Year Ended December 31, 2023 2022 2021 (In thousands) Cash dividends from Cathay Bank $ 134,000 $ 232,773 $ 230,000 Interest income 44 30 36 Interest expense 6,480 5,560 5,773 Non-interest Income 17,757 1,018 3,117 Non-interest expense 4,065 3,937 3,224 Income before income tax expense 141,256 224,324 224,156 Income tax expense/(benefit) 1,707 (2,885 ) (1,810 ) Income before undistributed earnings of subsidiaries 139,549 227,209 225,966 Undistributed earnings of subsidiary 214,575 133,433 72,338 Net income $ 354,124 $ 360,642 $ 298,304 Statements of Cash Flows Year Ended December 31, 2023 2022 2021 (In thousands) Cash flows from Operating Activities Net income $ 354,124 $ 360,642 $ 298,304 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries (214,575 ) (133,433 ) (72,338 ) Gain on equity securities (17,977 ) (733 ) (122 ) Write-downs on venture capital and other investments 179 268 73 Loss/(gain) in fair value of warrants 50 (27 ) — Stock issued to directors as compensation 850 849 850 Net change in accrued interest receivable and other assets 5,216 (434 ) 1,918 Net change in other liabilities (2,371 ) 8,531 4,934 Net cash provided by operating activities 125,496 235,663 233,619 Cash flows from Investment Activities Venture capital and other investments 168 (5 ) 357 Net cash (used)/provided by investment activities 168 (5 ) 357 Cash flows from Financing Activities Cash dividends paid (98,638 ) (100,955 ) (99,322 ) Proceeds from shares issued under the Dividend Reinvestment Plan 3,491 3,720 3,563 Taxes paid related to net share settlement of RSUs (4,490 ) (2,905 ) (2,632 ) Purchase of treasury stock (16,667 ) (141,316 ) (167,104 ) Net cash used in financing activities (116,304 ) (241,456 ) (265,495 ) Increase/(decrease) in cash, cash equivalents and restricted cash 9,360 (5,798 ) (31,519 ) Cash, cash equivalents, and restricted cash, beginning of the year 14,902 20,700 52,219 Cash, cash equivalents, and restricted cash, end of the period $ 24,262 $ 14,902 $ 20,700

Note 22 - Dividend Reinvestment

Note 22 - Dividend Reinvestment Plan	12 Months Ended
Note 22 - Dividend Reinvestment Plan	Dec. 31, 2023
Notes to Financial Statements
Dividend Reinvestment Plan [Text Block]	22. Dividend Reinvestment Plan The Company has a Dividend Reinvestment Plan which allows for participants’ reinvestment of cash dividends and certain optional additional investments in the Bancorp’s common stock. Shares issued under the plan and the consideration received were 93,182 shares for $3.5 million in 2023, 2022, 2021.

Note 23 - Regulatory Matters

Note 23 - Regulatory Matters	12 Months Ended
Note 23 - Regulatory Matters	Dec. 31, 2023
Notes to Financial Statements
Regulatory Capital Requirements under Banking Regulations [Text Block]	23. Regulatory Matters The Bank is subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of the Bank’s assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. The Bank’s capital amounts, and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors. The Federal Deposit Insurance Corporation has established five 1 1 1 December 31, 2023, 2022, The Bancorp’s and the Bank’s capital and leverage ratios as of December 31, 2023, December 31, 2022, Actual Minimum Capital Required - Basel III Required to be Considered Well Capitalized Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio December 31, 2023 (In thousands) Common Equity Tier 1 to Risk-Weighted Assets Cathay General Bancorp $ 2,430,773 12.84 $ 1,325,277 7.00 $ 1,230,615 6.50 Cathay Bank 2,501,439 13.23 1,323,846 7.00 1,229,286 6.50 Tier 1 Capital to Risk-Weighted Assets Cathay General Bancorp 2,430,773 12.84 1,609,265 8.50 1,514,602 8.00 Cathay Bank 2,501,439 13.23 1,607,527 8.50 1,512,967 8.00 Total Capital to Risk-Weighted Assets Cathay General Bancorp 2,709,888 14.31 1,987,916 10.50 1,893,253 10.00 Cathay Bank 2,665,054 14.09 1,985,769 10.50 1,891,209 10.00 Leverage Ratio Cathay General Bancorp 2,430,773 10.55 921,473 4.00 1,151,841 5.00 Cathay Bank 2,501,439 10.87 920,670 4.00 1,150,838 5.00 Actual Minimum Capital Required - Basel III Required to be Considered Well Capitalized Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio December 31, 2022 (In thousands) Common Equity Tier 1 to Risk-Weighted Assets Cathay General Bancorp $ 2,182,066 12.21 $ 1,250,914 7.00 $ 1,161,563 6.50 Cathay Bank 2,276,830 12.75 1,250,461 7.00 1,161,142 6.50 Tier 1 Capital to Risk-Weighted Assets Cathay General Bancorp 2,182,066 12.21 1,518,967 8.50 1,429,616 8.00 Cathay Bank 2,276,830 12.75 1,518,417 8.50 1,429,098 8.00 Total Capital to Risk-Weighted Assets Cathay General Bancorp 2,452,781 13.73 1,876,371 10.50 1,787,020 10.00 Cathay Bank 2,432,045 13.61 1,875,691 10.50 1,786,373 10.00 Leverage Ratio Cathay General Bancorp 2,182,066 10.08 865,470 4.00 1,081,838 5.00 Cathay Bank 2,276,830 10.53 864,918 4.00 1,081,148 5.00

Note 24 - Balance Sheet Offsett

Note 24 - Balance Sheet Offsetting	12 Months Ended
Note 24 - Balance Sheet Offsetting	Dec. 31, 2023
Notes to Financial Statements
Supplemental Balance Sheet Disclosures [Text Block]	24. Balance Sheet Offsetting Certain financial instruments, including resell and repurchase agreements, securities lending arrangements and derivatives, may may not Financial instruments that are eligible for offset in the Consolidated Balance Sheets, as of December 31, 2023, December 31, 2022, Gross Amounts Not Offset in the Balance Sheet Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Collateral Posted Net Amount December 31, 2023 (In thousands) Assets: Derivatives $ 54,268 $ 335 $ 53,933 $ — $ 44,860 $ 9,073 Liabilities: Derivatives $ 45,762 $ — $ 45,762 $ — $ — $ 45,762 December 31, 2022 Assets: Derivatives $ 90,451 $ 46,008 $ 44,443 $ — $ 42,930 $ 1,513 Liabilities: Derivatives $ 51,864 $ — $ 51,864 $ — $ — $ 51,864

Note 25 - Subsequent Events

Note 25 - Subsequent Events	12 Months Ended
Note 25 - Subsequent Events	Dec. 31, 2023
Notes to Financial Statements
Subsequent Events [Text Block]	25. Subsequent Events On February 15, 2024, first 2024 March 11, 2024 February 28, 2024 The Company has evaluated the effect of events that have occurred subsequent to December 31, 2023, none

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Use of Estimates, Policy [Policy Text Block]	Use of Estimates.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations. December 31, 2023, December 31, 2023,
Marketable Securities, Policy [Policy Text Block]	Securities Available for Sale. January 1, 2021, 2016 13, 1 2 not Interest income includes amortization of premiums and discounts as an adjustment of yield on a level-yield basis. Premiums on callable debt securities are amortized to their earliest call date. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. A debt security is placed on nonaccrual status at the time any principal or interest payments become delinquent by 90 not No
Allowance for Credit Losses on Available for Sale Debt Securities [Policy Text Block]	Allowance for Credit Losses on Available for Sale Securities. first not not not not Changes in the allowance for credit losses are recorded as provision for credit loss expense. Losses are charged against the allowance when management believes the uncollectability of an available-for-sale security is confirmed or when either of the criteria regarding intent or requirement to sell is met. The amortized cost of the Company’s AFS debt securities exclude accrued interest, which is included in “accrued interest receivable” on the Consolidated Balance Sheets. The Company has made an accounting policy election not Trading securities
Investment in Federal Home Loan Bank Stock [Policy Text Block]	Investment in Federal Home Loan Bank ( FHLB ) Stock. December 31, 2023, 2022, December 31, 2023,
Financing Receivable, Held-for-Investment [Policy Text Block]	Loans Held for Investment. 360 Generally, loans are placed on nonaccrual status when they become 90 not not not
Financing Receivable, Held-for-Sale [Policy Text Block]	Loans held for sale
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Credit Losses ( ACL ) on Loans Held for Investment. 2016 13, Financial Instruments Credit Losses (Topic 326 January 1, 2021 The ACL is the combination of the allowance for loan losses and the reserve for unfunded loan commitments. The allowance for loan losses is reported as a reduction of the amortized cost basis of loans, while the reserve for unfunded loan commitments is included within "other liabilities" on the Consolidated Balance Sheets. The amortized cost basis of loans does not Under the Company’s CECL approach, management estimates the ACL using relevant available information from internal and external sources, relating to past events, current conditions, and reasonable and supportable economic forecasts that vary by loan portfolio. We use economic forecasts from Moody’s Analytics in this process. The economic forecast is updated monthly; therefore, the one one not one Under the CECL methodology, quantitative and qualitative loss factors are applied to our population of loans on a collective pool basis when similar risk characteristics exist. The Company evaluates loans for expected credit losses on an individual basis if, based on current information and events, the loan does not may one 1 2 not Under the Company’s CECL methodology, nine three six six fourth 2007 fourth 2022. fourth 2007 fourth 2022. The Company’s CECL methodology utilizes an eight four 1 10th 3 90th four six The Company’s CECL methodology estimates expected credit losses over the contractual term of the loans, adjusted for expected prepayments when appropriate. The contractual term excludes expected extensions, renewals, and modifications unless the extension or renewal options are included in the original or modified contract at the reporting date and are not The simplified approach portfolios include Small Business Administration (“SBA”) loans, Home Equity Lines of Credit (“HELOCs”) and cash-secured loans, which are not three first eight four Under the Company’s CECL methodology, the qualitative portion of the reserve on pooled loans represents management’s judgment of additional considerations to account for internal and external risk factors that are not may not not The Company’s CECL methodology requires a significant amount of management judgment in determining the appropriate allowance for credit losses. Several of the steps in the methodology involve judgment and are subjective in nature including, among other things: segmenting the loan portfolio; determining the period over which loss history to consider; selecting predictive econometric regression models that use appropriate macroeconomic variables; determining the methodology to forecast prepayments; selecting the most appropriate economic forecast scenario; determining the length of the R&S forecast and reversion periods; estimating expected utilization rates on unfunded loan commitments; and assessing relevant and appropriate qualitative factors. In addition, the CECL methodology is dependent on economic forecasts that are inherently imprecise and will change from period to period. Although the allowance for credit losses is considered by management to be appropriate, there can be no Management believes the allowance for credit losses is appropriate for the current expected credit losses in our loan portfolio and associated unfunded commitments, and the risk ratings and inherent loss rates currently assigned are reasonable and appropriate as of the reporting date. It is possible that others, given the same information, may Individually Evaluated Loans not no may one 90 The Company has adopted ASU 2022 02, January 1, 2023. Under the new guidance on loan modifications made to borrowers experiencing financial difficulty, when a loan held for investment is modified and is considered to be a continuation of the original loan, the Company uses the post-modification contractual rate to derive the effective interest rate when using a discounted cash flow method to determine the allowance for credit loss. The amendments in this new guidance eliminate the previous TDR recognition and measurement guidance and, instead, require that an entity evaluate whether the modification represents a new loan or a continuation of an existing loan. Under the prior TDR guidance, a TDR is a formal modification of the terms of a loan when the lender, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower. The concessions may six The allowance for credit loss on a TDR was measured using the same method as all other loans held for investment, except when the value of a concession cannot be measured using a method other than the discounted cash flow method. Under the prior guidance when the value of a concession was measured using the discounted cash flow method, the allowance for credit loss was determined by discounting the expected future cash flows at the original interest rate of the loan.
Loan Commitments, Policy [Policy Text Block]	Unfunded Loan Commitments. not 14 The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company, using the same loss factors as used for the allowance for loan losses. The reserve for unfunded loan commitments uses the expected historical usage rate of the unfunded commitments during the contractual life of the commitments. The allowance for unfunded commitments is included in “other liabilities” on the Consolidated Balance Sheets. Changes in the allowance for unfunded commitments are included in the provision for loan losses.
Letter of Credit Fees [Policy Text Block]	Letter of Credit Fees
Real Estate Owned, Valuation Allowance, Policy [Policy Text Block]	Other Real Estate Owned ( OREO ).
Investments In Affordable Housing [Policy Text Block]	Investments in Affordable Housing Partnerships and Other Tax Credit Investments. 6 December 31, 2023, eleven ten
Investments in Venture Capital [Policy Text Block]	Investments in Venture Capital.
Property, Plant and Equipment, Policy [Policy Text Block]	Premises and Equipment. Type Estimated Useful Life (years) Buildings 15 to 45 Building improvements 5 to 20 Furniture, fixtures, and equipment 3 to 25 Leasehold improvements Shorter of useful lives or the terms of the leases Improvements are capitalized and amortized to occupancy expense based on the above table. Construction in process is carried at cost and includes land acquisition cost, architectural fees, general contractor fees, capitalized interest and other costs related directly to the construction of a property.
Goodwill and Intangible Assets, Policy [Policy Text Block]	Goodwill and Other Intangible Assets. December 31 may not December 31, 2023 2022.
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	Other intangible assets.
Bank-Owned Life Insurance [Policy text Block]	Bank-Owned Life Insurance.
Share-Based Payment Arrangement [Policy Text Block]	Stock-Based Compensation.
Derivatives, Policy [Policy Text Block]	Derivatives 815 not third not
Foreign Exchanged Forwards and Foreign Currency Option Contracts [Policy Text Block]	Foreign Exchange Forwards and Foreign Currency Option Contracts. not
Income Tax, Policy [Policy Text Block]	Income Taxes. not not
Comprehensive Income, Policy [Policy Text Block]	Comprehensive Income/(loss).
Earnings Per Share, Policy [Policy Text Block]	Net Income per Common Share
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation.
Cash and Cash Equivalents, Policy [Policy Text Block]	Statement of Cash Flows three
Segment Reporting, Policy [Policy Text Block]	Segment Reporting. one
New Accounting Pronouncements, Policy [Policy Text Block]	Accounting Pronouncements Adopted in 2023 In March 2022, 2022 01, 815 not 2022 01 one 2022 01 2022 01 not In March 2022, 2022 02, 326 2022 02 310 40, 2022 02 326 20, 5. Other Accounting Standards Pending Adoption In March 2023, 2023 02, 323 2023 02 2023 02 December 15, 2023. In June 2022, 2022 03, 820 2022 03 not not 2022 03 2022 03 January 1, 2024. 2022 03 not

Note 1 - Summary of Significa_2

Note 1 - Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Estimated Useful Lives of Assets [Table Text Block]	Type Estimated Useful Life (years) Buildings 15 to 45 Building improvements 5 to 20 Furniture, fixtures, and equipment 3 to 25 Leasehold improvements Shorter of useful lives or the terms of the leases

Note 2 - Business Combinations

Note 2 - Business Combinations (Tables)	12 Months Ended
Note 2 - Business Combinations (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Balance Sheet (In thousands) Assets: Cash and cash equivalents $ 473 Loans 641,839 Right-of-use assets - operating leases 6,453 Core deposit intangible 3,138 Other 561 Total assets $ 652,464 Liabilities assumed: Deposits $ 575,163 Lease liabilities 6,453 Total liabilities assumed $ 581,616 Net assets acquired $ 70,848 Total cash paid at closing $ 74,355 Goodwill $ 3,507

Note 4 - Investment Securities

Note 4 - Investment Securities (Tables)	12 Months Ended
Note 4 - Investment Securities (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block]	As of December 31, 2023 Gross Gross Amortized Unrealized Unrealized Cost Gains Losses Fair Value (In thousands) Securities Available-for-Sale U.S. treasury securities $ 495,167 $ 153 $ 20 $ 495,300 U.S. government agency entities 48,282 117 230 48,169 Mortgage-backed securities 892,942 223 106,442 786,723 Collateralized mortgage obligations 31,238 — 3,194 28,044 Corporate debt securities 258,451 22 12,139 246,334 Total $ 1,726,080 $ 515 $ 122,025 $ 1,604,570 As of December 31, 2022 Gross Gross Amortized Unrealized Unrealized Cost Gains Losses Fair Value (In thousands) Securities Available-for-Sale U.S. treasury securities $ 241,611 $ — $ 1,111 $ 240,500 U.S. government agency entities 63,347 384 121 63,610 U.S. government sponsored entities 30,000 — — 30,000 Mortgage-backed securities 993,883 194 126,983 867,094 Collateralized mortgage obligations 34,552 — 3,491 31,061 Corporate debt securities 258,780 112 17,809 241,083 Total $ 1,622,173 $ 690 $ 149,515 $ 1,473,348
Investments Classified by Contractual Maturity Date [Table Text Block]	Securities Available-for-Sale As of December 31, 2023 Amortized Cost Fair Value (In thousands) Due in one year or less $ 525,406 $ 524,948 Due after one year through five years 227,132 215,834 Due after five years through ten years 149,042 141,044 Due after ten years 824,500 722,744 Total $ 1,726,080 $ 1,604,570
Gain (Loss) on Securities [Table Text Block]	As of December 31, 2023 Less than 12 months 12 months or longer Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized Value Losses Value Losses Value Losses (In thousands) Securities Available-for-Sale U.S. treasury securities $ 49,831 $ 20 $ — $ — $ 49,831 $ 20 U.S. government agency entities 18,301 108 1,313 122 19,614 230 Mortgage-backed securities — — 768,274 106,442 768,274 106,442 Collateralized mortgage obligations — — 28,044 3,194 28,044 3,194 Corporate debt securities 64,448 552 166,864 11,587 231,312 12,139 Total $ 132,580 $ 680 $ 964,495 $ 121,345 $ 1,097,075 $ 122,025 As of December 31, 2022 Less than 12 months 12 months or longer Total Fair Gross Unrealized Fair Gross Unrealized Fair Gross Unrealized Value Losses Value Losses Value Losses (In thousands) Securities Available-for-Sale U.S. treasury securities $ 240,500 $ 1,111 $ — $ — $ 240,500 $ 1,111 U.S. government agency entities — — 1,806 121 1,806 121 Mortgage-backed securities 394,123 33,042 452,739 93,941 846,862 126,983 Collateralized mortgage obligations 24,427 1,614 6,634 1,877 31,061 3,491 Corporate debt securities 109,995 3,256 100,977 14,553 210,972 17,809 Total $ 769,045 $ 39,023 $ 562,156 $ 110,492 $ 1,331,201 $ 149,515

Note 5 - Loans (Tables)

Note 5 - Loans (Tables)	12 Months Ended
Note 5 - Loans (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	As of December 31, 2023 2022 (In thousands) Loans: Commercial loans $ 3,305,048 $ 3,318,778 Construction loans 422,647 559,372 Commercial real estate loans 9,729,581 8,793,685 Residential mortgage loans 5,838,747 5,252,952 Equity lines 245,919 324,548 Installment and other loans 6,198 4,689 Gross loans 19,548,140 18,254,024 Less: Allowance for loan losses (154,562 ) (146,485 ) Unamortized deferred loan fees (10,720 ) (6,641 ) Total loans, net $ 19,382,858 $ 18,100,898
Schedule of Related Party Transactions [Table Text Block]	December 31, 2023 2022 (In thousands) Balance at beginning of year $ 33,217 $ 38,532 Additional loans made 20,160 25,050 Payment received (7,670 ) (30,365 ) Balance at end of year $ 45,707 $ 33,217
Financing Receivable, Nonaccrual [Table Text Block]	For the year ended December 31, 2023 Average Recorded Investment Interest Income Recognized (In thousands) Commercial loans $ 18,008 $ 3 Construction loans 6,336 — Commercial real estate loans 35,742 318 Residential mortgage and equity lines 11,743 — Installment and other loans 1 — Total $ 71,830 $ 321 Average Recorded Investment Interest Income Recognized Commercial loans $ 28,109 $ 4 Construction loans 28,983 — Commercial real estate loans 14,251 405 Residential mortgage and equity lines 28 26 Total $ 71,371 $ 435 As of December 31, 2023 2022 2021 (In thousands) Non-accrual portfolio loans $ 66,681 $ 68,854 $ 65,846 Contractual interest due 6,270 4,620 4,032 Interest recognized 321 435 1,074 Net interest foregone $ 5,949 $ 4,185 $ 2,958
Schedule of Nonaccrual Loans and Related Allowance and Charge Off [Table Text Block]	As of December 31, 2023 Unpaid Principal Balance Recorded Investment Allowance (In thousands) With no allocated allowance: Commercial loans $ 26,310 $ 14,404 $ — Construction loans 7,736 7,736 — Commercial real estate loans 41,725 32,030 — Residential mortgage and equity lines 12,957 12,511 — Installment and other loans — — — Subtotal $ 88,728 $ 66,681 $ — With allocated allowance: Commercial loans $ — $ — $ — Commercial real estate loans — — — Residential mortgage and equity lines — — — Subtotal $ — $ — $ — Total non-accrual loans $ 88,728 $ 66,681 $ — As of December 31, 2022 Unpaid Principal Balance Recorded Investment Allowance (In thousands) With no allocated allowance: Commercial loans $ 27,341 $ 12,949 $ — Commercial real estate loans 37,697 32,205 — Residential mortgage and equity lines 9,626 8,978 Installment and other loans 9 8 — Subtotal $ 74,673 $ 54,140 $ — With allocated allowance: Commercial loans $ 14,643 $ 12,823 $ 3,734 Commercial real estate loans 1,896 1,891 207 Subtotal $ 16,539 $ 14,714 $ 3,941 Total non-accrual loans $ 91,212 $ 68,854 $ 3,941
Financing Receivable, Past Due [Table Text Block]	As of December 31, 2023 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Non-accrual Loans Total Past Due Loans Not Past Due Total Type of Loans: (In thousands) Commercial loans $ 11,771 $ 7,770 $ 508 $ 14,404 $ 34,453 $ 3,270,595 $ 3,305,048 Construction loans 25,389 22,998 — 7,736 56,123 366,524 422,647 Commercial real estate loans 27,900 1,503 6,649 32,030 68,082 9,661,499 9,729,581 Residential mortgage loans and equity lines 59,606 6,670 — 12,511 78,787 6,005,879 6,084,666 Installment and other loans 32 — — — 32 6,166 6,198 Total loans $ 124,698 $ 38,941 $ 7,157 $ 66,681 $ 237,477 $ 19,310,663 $ 19,548,140 As of December 31, 2022 30-59 Days Past Due 60-89 Days Past Due 90 Days or More Past Due Non-accrual Loans Total Past Due Loans Not Past Due Total Type of Loans: (In thousands) Commercial loans $ 8,192 $ 3,235 $ 10,208 $ 25,772 $ 47,407 $ 3,271,371 $ 3,318,778 Construction loans — — — — — 559,372 559,372 Commercial real estate loans 25,772 — 1,372 34,096 61,240 8,732,445 8,793,685 Residential mortgage loans and equity lines 47,043 5,685 — 8,978 61,706 5,515,794 5,577,500 Installment and other loans 5 1 — 8 14 4,675 4,689 Total loans $ 81,012 $ 8,921 $ 11,580 $ 68,854 $ 170,367 $ 18,083,657 $ 18,254,024
Schedule Of Troubled Debt Restructurings [Table Text Block]	Loans Modified as TDRs During the Year Ended December 31, 2022 No. of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve Charge-offs (Dollars in thousands) Commercial loans 4 $ 6,115 $ 6,115 $ 427 $ — Commercial real estate loans 3 3,676 3,669 — — Residential mortgage and equity lines 8 2,189 2,162 — — Total 15 $ 11,980 $ 11,946 $ 427 $ — Loans Modified as TDRs During the Year Ended December 31, 2021 No. of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Specific Reserve (1) Charge-off (Dollars in thousands) Commercial loans 3 $ 2,150 $ 2,150 $ — $ — Residential mortgage and equity lines 2 3 3 — — Total 5 $ 2,153 $ 2,153 $ — $ —
Financing Receivable, Modified, Amortized Cost [Table Text Block]	Financial Effects of Loan Modifications Payment Delay Combo-Rate Reduction/Term Extension/Payment Delay Total Modification as a % of Loan Class Weighted-Average Rate Reduction Weighted-Average Term Extension Weighted-Average Payment Deferral Loan Type Commercial loans $ — $ 2,650 $ 2,650 0.08 % 1.10 % 2.2 0.9 Residential mortgage loans 222 — 222 0.00 % 0.10 % 0.0 2.0 Total $ 222 $ 2,650 $ 2,872
Financing Receivable, Modified, Performance [Table Text Block]	Twelve Months Ended December 31, 2023 Current 30–89 Days Past Due 90+ Days Past Due Total (In thousands) Loan Type Commercial loans $ 2,650 $ — $ — $ 2,650 Residential mortgage loans 222 — — 222 Total $ 2,872 $ — $ — $ 2,872
Financing Receivable, Modified [Table Text Block]	December 31, 2022 Accruing TDRs Payment Deferral Rate Reduction Rate Reduction and Payment Deferral Total (In thousands) Commercial loans $ 2,588 $ — $ — $ 2,588 Commercial real estate loans 2,791 — 5,855 8,646 Residential mortgage loans 2,181 445 1,285 3,911 Total accruing TDRs $ 7,560 $ 445 $ 7,140 $ 15,145 December 31, 2022 Non-accrual TDRs Payment Deferral Rate Reduction Rate Reduction and Payment Deferral Total (In thousands) Commercial loans $ 3,629 $ — $ — $ 3,629 Commercial real estate loans 1,098 — — 1,098 Residential mortgage loans 1,621 — — 1,621 Total non-accrual TDRs $ 6,348 $ — $ — $ 6,348
Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year [Table Text Block]	Loans Amortized Cost Basis by Origination Year December 31, 2023 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Converted to Term Loans Total (In thousands) Commercial loans Pass/Watch $ 381,705 $ 323,939 $ 326,650 $ 96,725 $ 75,281 $ 136,162 $ 1,775,162 $ 8,308 $ 3,123,932 Special Mention 4,488 4,875 8,559 23,380 — — 75,419 — 116,721 Substandard 1,752 653 9,895 2,462 763 5,775 40,131 116 61,547 Doubtful — — — — — — — — — Total $ 387,945 $ 329,467 $ 345,104 $ 122,567 $ 76,044 $ 141,937 $ 1,890,712 $ 8,424 $ 3,302,200 YTD gross write-offs $ — $ 977 $ 1,312 $ 384 $ 3,672 $ 6,044 $ 1,520 $ — $ 13,909 Construction loans Pass/Watch $ 29,550 $ 131,984 $ 153,977 $ 19,461 $ 13,298 $ 3,131 $ — $ — $ 351,401 Special Mention 1,911 — 11,707 25,389 — 22,998 — — 62,005 Substandard — — — — 7,736 — — — 7,736 Total $ 31,461 $ 131,984 $ 165,684 $ 44,850 $ 21,034 $ 26,129 $ — $ — $ 421,142 YTD gross write-offs $ — $ — $ — $ — $ — $ 4,221 $ — $ — $ 4,221 Commercial real estate loans Pass/Watch $ 2,121,489 $ 1,959,239 $ 1,585,010 $ 887,508 $ 1,019,952 $ 1,726,015 $ 184,601 $ — $ 9,483,814 Special Mention 37,604 18,910 38,405 3,499 10,303 17,210 1,384 — 127,315 Substandard — 11,870 12,170 2,965 17,293 66,205 — — 110,503 Total $ 2,159,093 $ 1,990,019 $ 1,635,585 $ 893,972 $ 1,047,548 $ 1,809,430 $ 185,985 $ — $ 9,721,632 YTD gross write-offs $ — $ — $ 208 $ — $ 969 $ 4,164 $ — $ — $ 5,341 Residential mortgage loans Pass/Watch $ 1,140,998 $ 1,128,526 $ 902,613 $ 524,315 $ 541,005 $ 1,583,118 $ — $ — $ 5,820,575 Special Mention — — — 33 — 1,619 — — 1,652 Substandard 7 652 3,325 2,577 1,334 9,311 — — 17,206 Total $ 1,141,005 $ 1,129,178 $ 905,938 $ 526,925 $ 542,339 $ 1,594,048 $ — $ — $ 5,839,433 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Equity lines Pass/Watch $ — $ 98 $ — $ — $ — $ — $ 227,502 $ 16,628 $ 244,228 Special Mention — 3 — — — — — — 3 Substandard — — — — — — 2,511 173 2,684 Total $ — $ 101 $ — $ — $ — $ — $ 230,013 $ 16,801 $ 246,915 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Installment and other loans Pass/Watch $ 5,114 $ 981 $ 3 $ — $ — $ — $ — $ — $ 6,098 Total $ 5,114 $ 981 $ 3 $ — $ — $ — $ — $ — $ 6,098 YTD gross write-offs $ — $ 15 $ — $ — $ — $ — $ — $ — $ 15 Total loans $ 3,724,618 $ 3,581,730 $ 3,052,314 $ 1,588,314 $ 1,686,965 $ 3,571,544 $ 2,306,710 $ 25,225 $ 19,537,420 Total YTD gross write-offs $ — $ 992 $ 1,520 $ 384 $ 4,641 $ 14,429 $ 1,520 $ — $ 23,486 Loans Amortized Cost Basis by Origination Year December 31, 2022 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Converted to Term Loans Total (In thousands) Commercial loans Pass/Watch $ 488,748 $ 446,647 $ 180,226 $ 119,355 $ 107,896 $ 106,649 $ 1,753,509 $ 6,560 $ 3,209,590 Special Mention 1,212 4,696 2,818 68 308 4,354 41,110 — 54,566 Substandard 25 12,750 342 4,859 2,766 6,985 22,084 133 49,944 Doubtful — — — 1,504 2,185 — 234 — 3,923 Total $ 489,985 $ 464,093 $ 183,386 $ 125,786 $ 113,155 $ 117,988 $ 1,816,937 $ 6,693 $ 3,318,023 YTD gross write-offs $ 96 $ 587 $ 120 $ 71 $ 1,786 $ 360 $ 202 $ — $ 3,222 Construction loans Pass/Watch $ 99,798 $ 264,197 $ 113,312 $ 20,479 $ 3,067 $ — $ — $ — $ 500,853 Special Mention — 360 9,449 11,643 22,945 — — — 44,397 Substandard — — — 1,736 9,309 — — — 11,045 Total $ 99,798 $ 264,557 $ 122,761 $ 33,858 $ 35,321 $ — $ — $ — $ 556,295 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Commercial real estate loans Pass/Watch $ 2,087,650 $ 1,728,607 $ 975,953 $ 1,094,505 $ 908,748 $ 1,420,982 $ 178,116 $ — $ 8,394,561 Special Mention 22,150 57,015 25,593 32,119 17,999 63,782 1,600 — 220,258 Substandard 12,320 7,861 14,392 19,972 34,899 81,844 2,631 — 173,919 Total $ 2,122,120 $ 1,793,483 $ 1,015,938 $ 1,146,596 $ 961,646 $ 1,566,608 $ 182,347 $ — $ 8,788,738 YTD gross write-offs $ — $ — $ — $ — $ 2,152 $ — $ — $ — $ 2,152 Residential mortgage loans Pass/Watch $ 1,228,391 $ 964,799 $ 580,990 $ 600,786 $ 417,565 $ 1,444,320 $ — $ — $ 5,236,851 Special Mention — — 33 — 752 905 — — 1,690 Substandard 206 762 2,028 1,966 1,799 8,785 — — 15,546 Total $ 1,228,597 $ 965,561 $ 583,051 $ 602,752 $ 420,116 $ 1,454,010 $ — $ — $ 5,254,087 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Equity lines Pass/Watch $ 731 $ — $ — $ — $ — $ — $ 302,825 $ 21,460 $ 325,016 Special Mention 5 — — — — — — — 5 Substandard 12 — — — — — 1,043 220 1,275 Total $ 748 $ — $ — $ — $ — $ — $ 303,868 $ 21,680 $ 326,296 YTD gross write-offs $ — $ — $ — $ — $ — $ — $ — $ — $ — Installment and other loans Pass/Watch $ 1,792 $ 2,152 $ — $ — $ — $ — $ — $ — $ 3,944 Total $ 1,792 $ 2,152 $ — $ — $ — $ — $ — $ — $ 3,944 YTD gross write-offs $ 116 $ — $ — $ — $ — $ — $ — $ — $ 116 Total loans $ 3,943,040 $ 3,489,846 $ 1,905,136 $ 1,908,992 $ 1,530,238 $ 3,138,606 $ 2,303,152 $ 28,373 $ 18,247,383 Total YTD gross write-offs $ 212 $ 587 $ 120 $ 71 $ 3,938 $ 360 $ 202 $ — $ 5,490
Financing Receivable, Allowance for Credit Loss [Table Text Block]	Commercial Residential Installment Commercial Construction Real Estate Mortgage and Other Loans Loans Loans and Equity Lines Loans Total Allowance for loan losses (In thousands) 2021 Ending Balance $ 43,394 $ 6,302 $ 61,081 $ 25,379 $ 1 $ 136,157 Provision/(reversal) for expected credit losses 6,798 4,109 9,079 (7,221 ) 148 12,913 Charge-offs (3,222 ) — (2,152 ) — (116 ) (5,490 ) Recoveries 2,465 6 358 74 2 2,905 Net (Charge-offs)/Recoveries $ (757 ) $ 6 $ (1,794 ) $ 74 $ (114 ) $ (2,585 ) 2022 Ending Balance $ 49,435 $ 10,417 $ 68,366 $ 18,232 $ 35 $ 146,485 Provision/(reversal) for expected credit losses 15,275 1,984 8,570 (177 ) 3 25,655 Charge-offs (13,909 ) (4,221 ) (5,341 ) — (15 ) (23,486 ) Recoveries 2,990 — 2,833 85 — 5,908 Net (Charge-offs)/Recoveries $ (10,919 ) $ (4,221 ) $ (2,508 ) $ 85 $ (15 ) $ (17,578 ) 2023 Ending Balance $ 53,791 $ 8,180 $ 74,428 $ 18,140 $ 23 $ 154,562 Allowance for unfunded credit commitments, 2021 Ending Balance $ 3,725 $ 3,375 $ — $ — $ — $ 7,100 Provision for expected credit losses 1,115 515 — — — 1,630 Allowance for unfunded credit commitments 2022 Ending Balance $ 4,840 $ 3,890 $ — $ — $ — $ 8,730 Provision/(reversal) for expected credit losses 2,048 (1,725 ) — — — 323 Allowance for unfunded credit commitments 2023 Ending Balance $ 6,888 $ 2,165 $ — $ — $ — $ 9,053

Note 6 - Investments in Affor_2

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Investments in Affordable Housing and Alternative Energy Partnerships [Table Text Block]	As of December 31, 2023 2022 (In thousands) Investments in affordable housing partnerships, net $ 295,740 $ 289,920 Other borrowings for affordable housing limited partnerships $ 15,787 $ 22,600 Investments in affordable housing and alternative energy partnerships, unfunded commitments $ 106,452 $ 133,491 Investments in alternative energy tax credit partnerships, net $ 19,943 $ 37,208
Unfunded Commitments Future Estimated Payments [Table Text Block]	Amount Year Ending December 31, (In thousands) 2024 $ 49,810 2025 $ 34,871 2026 $ 15,194 2027 $ 1,400 2028 $ 1,019 Thereafter $ 4,158 Total unfunded commitments $ 106,452
Usage of Affordable Housing and Other Tax Credits Including Energy Tax Credit [Table Text Block]	As of December 31, 2023 2022 2021 (In thousands) Affordable housing and other tax credits recognized $ 32,395 $ 29,524 $ 26,459 Alternative energy tax credits recognized $ 41,320 $ 4,707 $ 6,337

Note 7 - Premises and Equipme_2

Note 7 - Premises and Equipment (Tables)	12 Months Ended
Note 7 - Premises and Equipment (Tables)	Dec. 31, 2023
Notes Tables
Property, Plant and Equipment [Table Text Block]	As of December 31, 2023 2022 (In thousands) Land and land improvements $ 42,566 $ 42,566 Building and building improvements 81,796 81,613 Furniture, fixtures and equipment 68,371 65,872 Leasehold improvement 18,056 18,009 Construction in process 941 375 211,730 208,435 Less: Accumulated depreciation 120,633 113,659 Premises and equipment, net $ 91,097 $ 94,776

Note 8 - Goodwill and Other I_2

Note 8 - Goodwill and Other Intangible Assets (Tables)	12 Months Ended
Note 8 - Goodwill and Other Intangible Assets (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Finite-Lived Intangible Assets [Table Text Block]	December 31, 2023 2022 (In thousands) Gross balance $ 10,562 $ 10,562 Accumulated amortization (5,291 ) (4,291 ) Impairment (1,227 ) (918 ) Net carrying balance $ 4,044 $ 5,353
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Amount (In thousands) 2024 $ 1,001 2025 $ 947 2026 $ 870 2027 $ 870 thereafter $ 356 Total $ 4,044

Note 9 - Deposits (Tables)

Note 9 - Deposits (Tables)	12 Months Ended
Note 9 - Deposits (Tables)	Dec. 31, 2023
Notes Tables
Summary of Deposits [Table Text Block]	As of December 31, 2023 2022 (In thousands) Deposits Non-interest-bearing demand deposits $ 3,529,018 $ 4,168,989 Interest bearing demand deposits 2,370,685 2,509,736 Money market deposits 3,049,754 3,812,724 Savings deposits 1,039,203 1,000,460 Time deposits 9,336,787 7,013,370 Total deposits $ 19,325,447 $ 18,505,279
Schedule of Maturities for Time Deposits [Table Text Block]	Expected Maturity Date at December 31, 2024 2025 2026 2027 2028 Thereafter Total (In thousands) Time deposits $ 9,312,877 $ 18,429 $ 3,203 $ 2,230 $ 23 $ 25 $ 9,336,787
Summary of Interest Expense on Deposits [Table Text Block]	Year Ended December 31, 2023 2022 2021 (In thousands) Interest bearing demand $ 40,952 $ 8,176 $ 2,249 Money market accounts 86,097 39,913 18,241 Saving accounts 8,916 853 769 Time deposits 331,997 56,354 40,542 Total $ 467,962 $ 105,296 $ 61,801

Note 11 - Capital Resources (Ta

Note 11 - Capital Resources (Tables)	12 Months Ended
Note 11 - Capital Resources (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Subordinated Borrowing [Table Text Block]	As of December 31, 2023 Principal Not Annualized Current Date of Payable/ Issuance Balance of Redeemable Stated Coupon Interest Rate Distribution Trust Name Date Notes Until Maturity Rate Rate Change Date (Dollars in thousands) Cathay Capital Trust I June 26, $ 20,619 June 30, June 30, 3-month 8.81 % December 29, March 30 2003 2008 2033 SOFR 2023 June 30 + 3.15% September 30 + 0.26161% December 30 Cathay Statutory Trust I September 17, 20,619 September 17, September 17, 3-month 8.67 % December 17, March 17 2003 2008 2033 SOFR 2023 June 17 + 3.00% September 17 + 0.26161% December 17 Cathay Capital Trust II December 30, 12,887 March 30, March 30, 3-month 8.56 % December 29, March 30 2003 2009 2034 SOFR 2023 June 30 + 2.90% September 30 + 0.26161% December 30 Cathay Capital Trust III March 28, 46,392 June 15, June 15, 3-month 7.15 % December 14, March 15 2007 2012 2037 SOFR 2023 June 15 + 1.48% September 15 + 0.26161% December 15 Cathay Capital Trust IV May 31, 18,619 September 6, September 6, 3-month 7.06 % December 5, March 6 2007 2012 2037 SOFR 2023 June 6 + 1.40% September 6 Total Junior Subordinated Notes $ 119,136 As of December 31, 2022 Principal Not Annualized Current Date of Payable/ Issuance Balance of Redeemable Stated Coupon Interest Rate Distribution Trust Name Date Notes Until Maturity Rate Rate Change Date (Dollars in thousands) Cathay Capital Trust I June 26, $ 20,619 June 30, June 30, 3-month 6.82 % December 29, March 30 2003 2008 2033 LIBOR 2022 June 30 + 3.15% September 30 December 30 Cathay Statutory Trust I September 17, 20,619 September 17, September 17, 3-month 6.53 % December 18, March 17 2003 2008 2033 LIBOR 2022 June 17 + 3.00% September 17 December 17 Cathay Capital Trust II December 30, 12,887 March 30, March 30, 3-month 6.57 % December 29, March 30 2003 2009 2034 LIBOR 2022 June 30 + 2.90% September 30 December 30 Cathay Capital Trust III March 28, 46,392 June 15, June 15, 3-month 4.77 % December 14, March 15 2007 2012 2037 LIBOR 2022 June 15 + 1.48% September 15 December 15 Cathay Capital Trust IV May 31, 18,619 September 6, September 6, 3-month 4.54 % December 5, March 6 2007 2012 2037 LIBOR 2022 June 6 + 1.4% September 6 December 6 Total Junior Subordinated Notes $ 119,136

Note 12 - Income Taxes (Tables)

Note 12 - Income Taxes (Tables)	12 Months Ended
Note 12 - Income Taxes (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 2023 2022 2021 (In thousands) Current: Federal $ 5,428 $ 57,029 $ 29,955 State 48,812 56,953 44,416 Total Current $ 54,240 $ 113,982 $ 74,371 Deferred: Federal $ (1,676 ) $ (1,776 ) $ 5,986 State (3,106 ) (312 ) 3,182 Total Deferred $ (4,782 ) $ (2,088 ) $ 9,168 Total income tax expense $ 49,458 $ 111,894 $ 83,539
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	As of December 31, 2023 2022 (In thousands) Deferred Tax Assets Loan loss allowance $ 50,126 $ 47,673 Accrual for bonuses 4,636 2,591 Non-accrual interest 2,164 1,572 Write-down on equity securities and venture capital investments 2,018 1,975 Depreciation and amortization 765 — State tax 5,693 6,251 Unrealized loss on securities available-for-sale, net 31,728 40,400 Tax credits carried forward 9,136 9,136 Net operating loss carried forward 3,787 5,916 Other, net 7,632 4,711 Gross deferred tax assets $ 117,685 $ 120,225 Deferred Tax Liabilities Deferred loan costs $ (9,687 ) $ (10,025 ) Depreciation and amortization — (2,856 ) Unrealized gain on interest rate swaps (838 ) (1,364 ) Unrealized gain on equity securities (4,863 ) — Dividends on Federal Home Loan Bank common stock (977 ) (981 ) Other, net (3,916 ) (3,506 ) Gross deferred tax liabilities $ (20,281 ) $ (18,732 ) Net deferred tax assets $ 97,404 $ 101,493
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2023 2022 2021 (Dollars in thousands) Tax provision at Federal statutory rate $ 84,752 21.0 % $ 99,233 21.0 % $ 80,187 21.0 % State income taxes, net of Federal income tax benefit 36,107 9.0 44,837 9.5 37,602 9.8 Excess deduction for stock option and RSUs (586 ) (0.1 ) (140 ) — (20 ) — Low income housing and other tax credits (73,715 ) (18.3 ) (34,231 ) (7.2 ) (32,795 ) (8.6 ) Other, net 2,900 0.7 2,195 0.4 (1,435 ) (0.3 ) Total income tax expense $ 49,458 12.3 % $ 111,894 23.7 % $ 83,539 21.9 %

Note 13 - Stockholders' Equit_2

Note 13 - Stockholders' Equity and Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	2023 2022 Pre-tax Tax expense/ (benefit) Net-of-tax Pre-tax Tax expense/ (benefit) Net-of-tax Beginning balance, loss, net of tax (In thousands) Securities available-for-sale $ (104,832 ) $ 211 Cash flow hedge derivatives 2,537 (3,276 ) Total $ (102,295 ) $ (3,065 ) Net unrealized gains/(losses) arising during the period Securities available-for-sale $ 24,315 $ 7,786 $ 16,529 $ (149,124 ) $ (44,081 ) $ (105,043 ) Cash flow hedge derivatives (2,503 ) (740 ) (1,763 ) 10,864 3,211 7,653 Total 21,812 7,046 14,766 (138,260 ) (40,870 ) (97,390 ) Reclassification adjustment for net gains/(losses) in net income Securities available-for-sale 3,000 887 2,113 — — — Cash flow hedge derivatives — — — (2,612 ) (772 ) (1,840 ) Total 3,000 887 2,113 (2,612 ) (772 ) (1,840 ) Total other comprehensive income/(loss) Securities available-for-sale 27,315 8,673 18,642 (149,124 ) (44,081 ) (105,043 ) Cash flow hedge derivatives (2,503 ) (740 ) (1,763 ) 8,252 2,439 5,813 Total $ 24,812 $ 7,933 $ 16,879 $ (140,872 ) $ (41,642 ) $ (99,230 ) Ending balance, gain/(loss), net of tax Securities available-for-sale $ (86,190 ) $ (104,832 ) Cash flow hedge derivatives 774 2,537 Total $ (85,416 ) $ (102,295 )
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	Year Ended December 31, 2023 2022 2021 Per Per Per Income Shares Share Income Shares Share Income Shares Share (Numerator) (Denominator) Amount (Numerator) (Denominator) Amount (Numerator) (Denominator) Amount (In thousands, except shares and per share data) Net income $ 354,124 $ 360,642 $ 298,304 Basic EPS, income $ 354,124 72,573,025 $ 4.88 $ 360,642 74,337,265 $ 4.85 $ 298,304 78,268,369 $ 3.81 Effect of dilutive stock options and RSU 289,603 327,470 302,269 Diluted EPS, income $ 354,124 72,862,628 $ 4.86 $ 360,642 74,664,735 $ 4.83 $ 298,304 78,570,638 $ 3.80

Note 14 - Commitments and Con_2

Note 14 - Commitments and Contingencies (Tables)	12 Months Ended
Note 14 - Commitments and Contingencies (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block]	As of December 31, 2023 2022 (In thousands) Commitments to extend credit $ 3,808,619 $ 3,630,304 Standby letters of credit 368,618 315,821 Commercial letters of credit 11,308 29,416 Total $ 4,188,545 $ 3,975,541

Note 15 - Leases (Tables)

Note 15 - Leases (Tables)	12 Months Ended
Note 15 - Leases (Tables)	Dec. 31, 2023
Notes Tables
Operating Lease, Assets and Liabilities, Weighted Average Remaining Terms and Discount Rate [Table Text Block]	December 31, 2023 December 31, 2022 (Dollars in millions) Operating Leases: ROU assets $ 32.1 $ 29.6 Lease liabilities $ 34.8 $ 32.5 Weighted-average remaining lease term (in years) 4.1 4.0 Weighted-average discount rate 3.8 % 2.9 % Operating cash flows from operating leases $ 11.4 $ 11.4 ROU assets obtained in exchange for lease obligations $ 12.6 $ 5.9
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]	As of December 31, 2023 Operating Leases (In thousands) 2024 $ 10,800 2025 8,960 2026 7,297 2027 5,238 2028 3,916 Thereafter 1,403 Total lease payments $ 37,614 Less amount of payment representing interest (2,817 ) Total present value of lease payments $ 34,797

Note 16 - Financial Derivativ_2

Note 16 - Financial Derivatives (Tables)	12 Months Ended
Note 16 - Financial Derivatives (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	December 31, 2023 December 31, 2022 Fair value swap hedges: ($ in thousands) Notional $ 1,156,007 $ 874,034 Weighted average fixed rate-pay 2.01 % 2.12 % Weighted average variable rate spread 0.32 % 0.68 % Weighted average variable rate-received 5.41 % 2.61 % Net gain/(loss) (1) $ 7,935 $ 38,589 Year ended December 31, 2023 December 31, 2022 Periodic net settlement of SWAPs (2) $ 29,514 $ 3,107
Derivatives Not Designated as Hedging Instruments [Table Text Block]	Derivative financial instruments December 31, 2023 December 31, 2022 not designated as hedging instruments: (In thousands) Notional amounts: Option contracts $ — $ — Forward, and swap contracts with positive fair value $ 775,324 $ 668,422 Forward, and swap contracts with negative fair value $ 752,250 $ 765,639 Fair value: Forward, and swap contracts with positive fair value $ 39,010 $ 50,467 Forward, and swap contracts with negative fair value $ (38,807 ) $ (50,962 )

Note 17 - Fair Value Measurem_2

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	As of December 31, 2023 Fair Value Measurements Using Total at Level 1 Level 2 Level 3 Fair Value Assets (In thousands) Securities available-for-sale U.S. Treasury securities $ 495,300 $ — $ — $ 495,300 U.S. government agency entities — 48,169 — 48,169 U.S. government sponsored entities — — — — Mortgage-backed securities — 786,723 — 786,723 Collateralized mortgage obligations — 28,044 — 28,044 Corporate debt securities — 246,334 — 246,334 Total securities available-for-sale 495,300 1,109,270 — 1,604,570 Equity securities Mutual funds 5,585 — — 5,585 Preferred stock of government sponsored entities 1,821 — — 1,821 Other equity securities 33,000 — — 33,000 Total equity securities 40,406 — — 40,406 Warrants — — — — Interest rate swaps — 54,268 — 54,268 Foreign exchange contracts 379 — 379 Total assets $ 535,706 $ 1,163,917 $ — $ 1,699,623 Liabilities Interest rate swaps $ — $ 45,762 $ — $ 45,762 Foreign exchange contracts — 175 — 175 Total liabilities $ — $ 45,937 $ — $ 45,937 As of December 31, 2022 Fair Value Measurements Using Total at Level 1 Level 2 Level 3 Fair Value Assets (In thousands) Securities available-for-sale U.S. Treasury securities $ 240,500 $ — $ — $ 240,500 U.S. government agency entities — 63,610 — 63,610 U.S. government sponsored entities — 30,000 — 30,000 Mortgage-backed securities — 867,094 — 867,094 Collateralized mortgage obligations — 31,061 — 31,061 Corporate debt securities — 241,083 — 241,083 Total securities available-for-sale 240,500 1,232,848 — 1,473,348 Equity securities Mutual funds 5,509 — — 5,509 Preferred stock of government sponsored entities 1,289 — — 1,289 Other equity securities 15,360 — — 15,360 Total equity securities 22,158 — — 22,158 Warrants — — 50 50 Interest rate swaps — 44,443 — 44,443 Foreign exchange contracts — 448 — 448 Total assets $ 262,658 $ 1,277,739 $ 50 $ 1,540,447 Liabilities Interest rate swaps $ — $ 51,864 $ — $ 51,864 Foreign exchange contracts — 942 — 942 Total liabilities $ — $ 52,806 $ — $ 52,806
Fair Value Measurements, Nonrecurring [Table Text Block]	As of December 31, 2023 Total Losses Fair Value Measurements Using Total at For the Twelve Months Ended Level 1 Level 2 Level 3 Fair Value December 31, 2023 December 31, 2022 Assets (In thousands) Non-accrual loans by type: Commercial loans $ — $ — $ 191 $ 191 $ — $ 1,786 Commercial real estate loans — — 6,882 6,882 4,069 2,091 Total non-accrual loans — — 7,073 7,073 4,069 3,877 Other real estate owned (1) — — 20,446 20,446 — — Investments in venture capital — — 237 237 227 268 Total assets $ — $ — $ 27,756 $ 27,756 $ 4,296 $ 4,145 As of December 31, 2022 Total Losses Fair Value Measurements Using Total at For the Twelve Months Ended Level 1 Level 2 Level 3 Fair Value December 31, 2022 December 31, 2021 Assets (In thousands) Non-accrual loans by type: Commercial loans $ — $ — $ 12,950 $ 12,950 $ 1,786 $ 1,012 Commercial real estate loans — — 32,205 32,205 2,091 — Residential mortgage and equity lines — — 8,978 8,978 — — Installment and other loans — — 8 8 — — Total non-accrual loans — — 54,141 54,141 3,877 1,012 Other real estate owned (1) — — 4,328 4,328 — 17 Investments in venture capital — — 689 689 268 143 Total assets $ — $ — $ 59,158 $ 59,158 $ 4,145 $ 1,172
Fair Value, by Balance Sheet Grouping [Table Text Block]	December 31, 2023 December 31, 2022 Carrying Carrying Amount Fair Value Amount Fair Value (In thousands) Financial Assets Cash and due from banks $ 173,988 $ 173,988 $ 195,440 $ 195,440 Short-term investments 654,813 654,813 966,962 966,962 Securities available-for-sale 1,604,570 1,604,570 1,473,348 1,473,348 Loans, net 19,382,858 19,605,152 18,100,898 17,944,588 Equity securities 40,406 40,406 22,158 22,158 Investment in Federal Home Loan Bank stock 17,746 17,746 17,250 17,250 Warrants — — 50 50 Notional Notional Amount Fair Value Amount Fair Value Foreign exchange contracts $ 124,452 $ 379 $ 72,996 $ 448 Interest rate swaps 1,406,879 54,268 817,615 44,443 Financial Liabilities Carrying Carrying Amount Fair Value Amount Fair Value Deposits $ 19,325,447 $ 19,347,070 $ 18,505,279 $ 18,572,387 Advances from Federal Home Loan Bank 540,000 536,996 485,000 482,737 Other borrowings 15,787 13,978 22,600 18,385 Long-term debt 119,136 72,304 119,136 68,231 Notional Notional Amount Fair Value Amount Fair Value Foreign exchange contracts 101,378 175 170,213 942 Interest rate swaps 1,078,880 45,762 595,426 51,864 Notional Notional Amount Fair Value Amount Fair Value Off-Balance Sheet Financial Instruments Commitments to extend credit $ 3,808,620 $ (14,344 ) $ 3,630,304 $ (14,797 ) Standby letters of credit 368,618 (2,821 ) 315,821 (2,738 ) Other letters of credit 11,308 (10 ) 29,416 (33 )
Schedule Of Fair Value Of Financial Instruments [Table Text Block]	As of December 31, 2023 Estimated Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) Financial Assets Cash and due from banks $ 173,988 $ 173,988 $ — $ — Short-term investments 654,813 654,813 — — Loans, net 19,605,152 — — 19,605,152 Equity securities 40,406 40,406 — — Investment in Federal Home Loan Bank stock 17,746 — 17,746 — Warrants — — — — Financial Liabilities Deposits 19,347,070 — — 19,347,070 Advances from Federal Home Loan Bank 536,996 — 536,996 — Other borrowings 13,978 — — 13,978 Long-term debt 72,304 — 72,304 — As of December 31, 2022 Estimated Fair Value Measurements Level 1 Level 2 Level 3 (In thousands) Financial Assets Cash and due from banks $ 195,440 $ 195,440 $ — $ — Short-term investments 966,962 966,962 — — Loans, net 17,944,588 — — 17,944,588 Equity securities 22,158 22,158 — — Investment in Federal Home Loan Bank stock 17,250 — 17,250 — Warrants 50 — — 50 Financial Liabilities Deposits 18,572,387 — — 18,572,387 Advances from Federal Home Loan Bank 482,737 — 482,737 — Other borrowings 18,385 — — 18,385 Long-term debt 68,231 — 68,231 —

Note 18 - Revenue From Contra_2

Note 18 - Revenue From Contracts With Clients (Tables)	12 Months Ended
Note 18 - Revenue From Contracts With Clients (Tables)	Dec. 31, 2023
Notes Tables
Disaggregation of Revenue [Table Text Block]	Year Ended December 31, 2023 2022 2021 (In thousands) Non-interest income, in-scope: Fees and service charges on deposit accounts $ 9,204 $ 9,394 $ 8,618 Wealth management fees 17,506 16,436 15,056 Other service fees (1) 17,202 16,349 15,400 Total in-scope non-interest income 43,912 42,179 39,074 Noninterest income, not in-scope (2) 24,380 14,635 15,529 Total non-interest income $ 68,292 $ 56,814 $ 54,603

Note 20 - Equity Incentive Pl_2

Note 20 - Equity Incentive Plans (Tables)	12 Months Ended
Note 20 - Equity Incentive Plans (Tables)	Dec. 31, 2023
Notes Tables
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	Time-Based RSUs Performance-Based RSUs Weighted-Average Weighted-Average Grant Date Grant Date Shares Fair Value Shares Fair Value Balance at December 31, 2020 292,670 $ 33.37 302,802 $ 32.55 Granted 63,467 41.18 113,764 37.13 Vested (96,869 ) 41.72 (76,292 ) 41.69 Forfeited (23,324 ) 29.92 (7,768 ) 40.85 Balance at December 31, 2021 235,944 $ 32.38 332,506 $ 31.82 Granted 67,652 46.69 112,393 40.24 Vested (89,386 ) 40.92 (81,934 ) 44.52 Forfeited (12,151 ) 34.07 — — Balance at December 31, 2022 202,059 $ 33.29 362,965 $ 31.56 Granted 86,809 37.92 123,504 38.41 Vested (92,075 ) 34.29 (136,808 ) 34.21 Forfeited (2,404 ) 37.77 — — Balance at December 31, 2023 194,389 $ 34.83 349,661 $ 32.94

Note 21 - Condensed Financial_2

Note 21 - Condensed Financial Information of Cathay General Bancorp (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Condensed Balance Sheet [Table Text Block]	As of December 31, 2023 2022 (In thousands, except share and per share data) Assets Cash $ 24,262 $ 14,902 Short-term certificates of deposit 335 334 Equity securities 34,441 16,360 Investment in Cathay Bank subsidiary 2,806,467 2,566,266 Investment in non-bank subsidiary 68 764 Other assets 3,896 4,385 Total assets $ 2,869,469 $ 2,603,011 Liabilities Junior subordinated debt $ 119,136 $ 119,136 Other liabilities 13,758 9,835 Total liabilities 132,894 128,971 Commitments and contingencies — — Stockholders' equity Common stock, $ 0.01 100,000,000 91,392,480 72,668,927 91,090,614 72,742,151 914 911 Additional paid-in-capital 987,953 981,119 Accumulated other comprehensive loss, net (85,416 ) (102,295 ) Retained earnings 2,500,341 2,244,855 Treasury stock, at cost ( 18,723,553 18,348,463 (667,217 ) (650,550 ) Total equity 2,736,575 2,474,040 Total liabilities and equity $ 2,869,469 $ 2,603,011
Condensed Income Statement [Table Text Block]	Year Ended December 31, 2023 2022 2021 (In thousands) Cash dividends from Cathay Bank $ 134,000 $ 232,773 $ 230,000 Interest income 44 30 36 Interest expense 6,480 5,560 5,773 Non-interest Income 17,757 1,018 3,117 Non-interest expense 4,065 3,937 3,224 Income before income tax expense 141,256 224,324 224,156 Income tax expense/(benefit) 1,707 (2,885 ) (1,810 ) Income before undistributed earnings of subsidiaries 139,549 227,209 225,966 Undistributed earnings of subsidiary 214,575 133,433 72,338 Net income $ 354,124 $ 360,642 $ 298,304
Condensed Cash Flow Statement [Table Text Block]	Year Ended December 31, 2023 2022 2021 (In thousands) Cash flows from Operating Activities Net income $ 354,124 $ 360,642 $ 298,304 Adjustments to reconcile net income to net cash provided by operating activities: Equity in undistributed earnings of subsidiaries (214,575 ) (133,433 ) (72,338 ) Gain on equity securities (17,977 ) (733 ) (122 ) Write-downs on venture capital and other investments 179 268 73 Loss/(gain) in fair value of warrants 50 (27 ) — Stock issued to directors as compensation 850 849 850 Net change in accrued interest receivable and other assets 5,216 (434 ) 1,918 Net change in other liabilities (2,371 ) 8,531 4,934 Net cash provided by operating activities 125,496 235,663 233,619 Cash flows from Investment Activities Venture capital and other investments 168 (5 ) 357 Net cash (used)/provided by investment activities 168 (5 ) 357 Cash flows from Financing Activities Cash dividends paid (98,638 ) (100,955 ) (99,322 ) Proceeds from shares issued under the Dividend Reinvestment Plan 3,491 3,720 3,563 Taxes paid related to net share settlement of RSUs (4,490 ) (2,905 ) (2,632 ) Purchase of treasury stock (16,667 ) (141,316 ) (167,104 ) Net cash used in financing activities (116,304 ) (241,456 ) (265,495 ) Increase/(decrease) in cash, cash equivalents and restricted cash 9,360 (5,798 ) (31,519 ) Cash, cash equivalents, and restricted cash, beginning of the year 14,902 20,700 52,219 Cash, cash equivalents, and restricted cash, end of the period $ 24,262 $ 14,902 $ 20,700

Note 23 - Regulatory Matters (T

Note 23 - Regulatory Matters (Tables)	12 Months Ended
Note 23 - Regulatory Matters (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	Actual Minimum Capital Required - Basel III Required to be Considered Well Capitalized Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio December 31, 2023 (In thousands) Common Equity Tier 1 to Risk-Weighted Assets Cathay General Bancorp $ 2,430,773 12.84 $ 1,325,277 7.00 $ 1,230,615 6.50 Cathay Bank 2,501,439 13.23 1,323,846 7.00 1,229,286 6.50 Tier 1 Capital to Risk-Weighted Assets Cathay General Bancorp 2,430,773 12.84 1,609,265 8.50 1,514,602 8.00 Cathay Bank 2,501,439 13.23 1,607,527 8.50 1,512,967 8.00 Total Capital to Risk-Weighted Assets Cathay General Bancorp 2,709,888 14.31 1,987,916 10.50 1,893,253 10.00 Cathay Bank 2,665,054 14.09 1,985,769 10.50 1,891,209 10.00 Leverage Ratio Cathay General Bancorp 2,430,773 10.55 921,473 4.00 1,151,841 5.00 Cathay Bank 2,501,439 10.87 920,670 4.00 1,150,838 5.00 Actual Minimum Capital Required - Basel III Required to be Considered Well Capitalized Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio December 31, 2022 (In thousands) Common Equity Tier 1 to Risk-Weighted Assets Cathay General Bancorp $ 2,182,066 12.21 $ 1,250,914 7.00 $ 1,161,563 6.50 Cathay Bank 2,276,830 12.75 1,250,461 7.00 1,161,142 6.50 Tier 1 Capital to Risk-Weighted Assets Cathay General Bancorp 2,182,066 12.21 1,518,967 8.50 1,429,616 8.00 Cathay Bank 2,276,830 12.75 1,518,417 8.50 1,429,098 8.00 Total Capital to Risk-Weighted Assets Cathay General Bancorp 2,452,781 13.73 1,876,371 10.50 1,787,020 10.00 Cathay Bank 2,432,045 13.61 1,875,691 10.50 1,786,373 10.00 Leverage Ratio Cathay General Bancorp 2,182,066 10.08 865,470 4.00 1,081,838 5.00 Cathay Bank 2,276,830 10.53 864,918 4.00 1,081,148 5.00

Note 24 - Balance Sheet Offse_2

Note 24 - Balance Sheet Offsetting (Tables)	12 Months Ended
Note 24 - Balance Sheet Offsetting (Tables)	Dec. 31, 2023
Notes Tables
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	Gross Amounts Not Offset in the Balance Sheet Gross Amounts Recognized Gross Amounts Offset in the Balance Sheet Net Amounts Presented in the Balance Sheet Financial Instruments Collateral Posted Net Amount December 31, 2023 (In thousands) Assets: Derivatives $ 54,268 $ 335 $ 53,933 $ — $ 44,860 $ 9,073 Liabilities: Derivatives $ 45,762 $ — $ 45,762 $ — $ — $ 45,762 December 31, 2022 Assets: Derivatives $ 90,451 $ 46,008 $ 44,443 $ — $ 42,930 $ 1,513 Liabilities: Derivatives $ 51,864 $ — $ 51,864 $ — $ — $ 51,864

Note 1 - Summary of Significa_3

Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)
Number Of Limited Partnerships In Housing Investments	11
Percentage of Subsidiaries Common Securities Owned by Parent Company	100%
Gross Loans Comprised of Commercial Mortgage Loans Percentage	49.80%
Residential Mortgages Properties Percentage	29.90%
Gross Loans Comprised of Commercial Loans Percentage	16.90%
Federal Home Loan Bank Stock \| $	$ 17,746	$ 17,250
Federal Home Loan Bank Stock Shares (in shares) \| shares	177,458
Minimum Stock Requirement on Outstanding Federal Home Loan Bank Borrowings Shares (in shares) \| shares	150,000
Variable Interest Entity, Primary Beneficiary, Number of Entities	10
Goodwill, Impairment Loss \| $	$ 0	$ 0
Number of Reportable Segments	1
California [Member]
Residential Mortgages Properties Percentage	50.50%

Note 1 - Summary of Significa_4

Note 1 - Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	Dec. 31, 2023
Minimum [Member] \| Building [Member]
Assets, estimated useful life (Year)	15 years
Minimum [Member] \| Building Improvements [Member]
Assets, estimated useful life (Year)	5 years
Minimum [Member] \| Furniture Fixtures and Equipment [Member]
Assets, estimated useful life (Year)	3 years
Maximum [Member] \| Building [Member]
Assets, estimated useful life (Year)	45 years
Maximum [Member] \| Building Improvements [Member]
Assets, estimated useful life (Year)	20 years
Maximum [Member] \| Furniture Fixtures and Equipment [Member]
Assets, estimated useful life (Year)	25 years

Note 2 - Business Combination_2

Note 2 - Business Combinations (Details Textual) $ in Thousands	Feb. 07, 2022 USD ($)
HSBC Bank USA [Member]
Number Of Branch Locations	10
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financing Receivable	$ 646,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposit Liabilities	$ 575,163

Note 2 - Business Combination_3

Note 2 - Business Combinations - Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Feb. 07, 2022	Dec. 31, 2023	Dec. 31, 2022
Goodwill		$ 375,696	$ 375,696
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Cash and cash equivalents	$ 473
Loans	641,839
Right-of-use assets - operating leases	6,453
Core deposit intangible	3,138
Other	561
Total assets	652,464
Deposits	575,163
Lease liabilities	6,453
Total liabilities assumed	581,616
Net assets acquired	70,848
Total cash paid at closing	74,355
Goodwill	$ 3,507

Note 3 - Cash, Cash Equivalen_2

Note 3 - Cash, Cash Equivalents and Restricted Cash (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Average Excess Balances Maintained With Federal Reserve Bank	$ 1,090	$ 1,240
Margin Deposit Assets	53.8	88.9
Restricted Cash	6.4	25.4
Bank [Member]
Restricted Cash	$ 8.6	$ 8.2

Note 4 - Investment Securitie_2

Note 4 - Investment Securities (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 0	$ 0	$ 21,102
Debt Securities, Available-for-Sale, Realized Gain	0		853
Debt Securities, Available-for-Sale, Allowance for Credit Loss	0	0
Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense	$ 0	0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	192
Pledged Investment Securities	$ 134,200	145,700
Equity Securities, FV-NI, Current	40,406	22,158
Equity Securities, Net Realized Loss From Decrease in Fair Value	18,200	291	1,400
Proceeds from Sale, Debt Security, Trading, and Equity Security, FV-NI, Held-for-Investment	$ 0	553	$ 0
Equity Securities, FV-NI, Realized Gain (Loss)		$ (101)
Collateralized Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	154	159
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	24	22
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	1	6
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	5	5
US Government Corporations and Agencies Securities [Member]
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions	8	3

Note 4 - Investment Securitie_3

Note 4 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment securities available for sale, amortized cost	$ 1,726,080	$ 1,622,173
Investment securities available for sale, gross unrealized gains	515	690
Investment securities available for sale, gross unrealized losses	122,025	149,515
Securities available-for-sale	1,604,570	1,473,348
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	495,167	241,611
Investment securities available for sale, gross unrealized gains	153	0
Investment securities available for sale, gross unrealized losses	20	1,111
Securities available-for-sale	495,300	240,500
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	48,282	63,347
Investment securities available for sale, gross unrealized gains	117	384
Investment securities available for sale, gross unrealized losses	230	121
Securities available-for-sale	48,169	63,610
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	892,942	993,883
Investment securities available for sale, gross unrealized gains	223	194
Investment securities available for sale, gross unrealized losses	106,442	126,983
Securities available-for-sale	786,723	867,094
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities available for sale, amortized cost		30,000
Investment securities available for sale, gross unrealized gains		0
Investment securities available for sale, gross unrealized losses		0
Securities available-for-sale	0	30,000
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	31,238	34,552
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	3,194	3,491
Securities available-for-sale	28,044	31,061
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	258,451	258,780
Investment securities available for sale, gross unrealized gains	22	112
Investment securities available for sale, gross unrealized losses	12,139	17,809
Securities available-for-sale	$ 246,334	$ 241,083

Note 4 - Investment Securitie_4

Note 4 - Investment Securities - Investments by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Due in one year or less, Amortized Cost	$ 525,406
Due in one year or less, Fair Value	524,948
Due after one year through five years, Amortized Cost	227,132
Due after one year through five years, Fair Value	215,834
Due after five years through ten years, Amortized Cost	149,042
Due after five years through ten years, Fair Value	141,044
Due after ten years, Amortized Cost	824,500
Due after ten years, Fair Value	722,744
Total, Amortized Cost	1,726,080	$ 1,622,173
Total, Fair Value	$ 1,604,570	$ 1,473,348

Note 4 - Investment Securitie_5

Note 4 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Temporarily impaired securities, less than 12 months, fair value	$ 132,580	$ 769,045
Temporarily impaired securities, less than 12 months, unrealized losses	680	39,023
Temporarily impaired securities, 12 months or longer, fair value	964,495	562,156
Temporarily impaired securities, 12 months or longer, unrealized losses	121,345	110,492
Temporarily impaired securities, total fair value	1,097,075	1,331,201
Temporarily impaired securities, total unrealized losses	122,025	149,515
US Treasury Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	49,831	240,500
Temporarily impaired securities, less than 12 months, unrealized losses	20	1,111
Temporarily impaired securities, 12 months or longer, fair value	0	0
Temporarily impaired securities, 12 months or longer, unrealized losses	0	0
Temporarily impaired securities, total fair value	49,831	240,500
Temporarily impaired securities, total unrealized losses	20	1,111
US Government Corporations and Agencies Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	18,301	0
Temporarily impaired securities, less than 12 months, unrealized losses	108	0
Temporarily impaired securities, 12 months or longer, fair value	1,313	1,806
Temporarily impaired securities, 12 months or longer, unrealized losses	122	121
Temporarily impaired securities, total fair value	19,614	1,806
Temporarily impaired securities, total unrealized losses	230	121
Collateralized Mortgage-Backed Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	0	394,123
Temporarily impaired securities, less than 12 months, unrealized losses	0	33,042
Temporarily impaired securities, 12 months or longer, fair value	768,274	452,739
Temporarily impaired securities, 12 months or longer, unrealized losses	106,442	93,941
Temporarily impaired securities, total fair value	768,274	846,862
Temporarily impaired securities, total unrealized losses	106,442	126,983
Collateralized Mortgage Obligations [Member]
Temporarily impaired securities, less than 12 months, fair value	0	24,427
Temporarily impaired securities, less than 12 months, unrealized losses	0	1,614
Temporarily impaired securities, 12 months or longer, fair value	28,044	6,634
Temporarily impaired securities, 12 months or longer, unrealized losses	3,194	1,877
Temporarily impaired securities, total fair value	28,044	31,061
Temporarily impaired securities, total unrealized losses	3,194	3,491
Corporate Debt Securities [Member]
Temporarily impaired securities, less than 12 months, fair value	64,448	109,995
Temporarily impaired securities, less than 12 months, unrealized losses	552	3,256
Temporarily impaired securities, 12 months or longer, fair value	166,864	100,977
Temporarily impaired securities, 12 months or longer, unrealized losses	11,587	14,553
Temporarily impaired securities, total fair value	231,312	210,972
Temporarily impaired securities, total unrealized losses	$ 12,139	$ 17,809

Note 5 - Loans (Details Textual

Note 5 - Loans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Note 5 - Loans (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Servicing Asset	$ 203,000	$ 181,400
Financing Receivable, Nonaccrual	66,681	68,854
Financing Receivable, Nonaccrual, Average Recorded Investment	71,830	71,371
Financing Receivable, Nonaccrual, Interest Income	$ 321	$ 435	$ 1,074
Percentage Of Charge Off To Contractual Balances For Impaired Loans	15.80%	14.10%
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve		$ 427	0
Financing Receivable, Modified, Subsequent Default	$ 0	$ 0
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 0
Minimum [Member]
Period Loan Is In Payment Default (Day)	60 days	60 days
Maximum [Member]
Period Loan Is In Payment Default (Day)	90 days	90 days
Accruing Troubled Debt Restructuring [Member]
Financing Receivable, Troubled Debt Restructuring		$ 15,100
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve		0
Non-accruing Troubled Debt Restructuring [Member]
Financing Receivable, Troubled Debt Restructuring		6,300
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve		427
Residential Portfolio Segment [Member]
Servicing Asset	$ 70,700	80,200
Repossessed Assets	242	456
Commercial Real Estate Portfolio Segment [Member]
Servicing Asset	76,100	51,600
Financing Receivable, Nonaccrual, Average Recorded Investment	35,742	14,251
Financing Receivable, Nonaccrual, Interest Income	318	405
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve		0
Commercial Construction Loans [Member]
Servicing Asset	11,800	2,500
Commercial Portfolio Segment [Member]
Servicing Asset	44,400	47,100
Financing Receivable, Nonaccrual, Average Recorded Investment	18,008	28,109
Financing Receivable, Nonaccrual, Interest Income	3	4
Financing Receivables, Impaired, Troubled Debt Restructuring, Specific Reserve		427	$ 0
Real Estate Loan [Member]
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	14,150,000	13,070,000
Commercial Loans [Member]
Loans Pledged with Federal Reserve Bank	$ 388	$ 583

Note 5 - Loans - Components of

Note 5 - Loans - Components of Loans in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans	$ 19,548,140	$ 18,254,024
Less: Allowance for loan losses	(154,562)	(146,485)	$ (136,157)
Unamortized deferred loan fees, net	(10,720)	(6,641)
Loans, net	19,382,858	18,100,898
Commercial Portfolio Segment [Member]
Loans	3,305,048	3,318,778
Less: Allowance for loan losses	(53,791)	(49,435)	(43,394)
Real Estate Construction Portfolio Segment [Member]
Loans	422,647	559,372
Less: Allowance for loan losses	(8,180)	(10,417)	(6,302)
Commercial Real Estate Portfolio Segment [Member]
Loans	9,729,581	8,793,685
Less: Allowance for loan losses	(74,428)	(68,366)	(61,081)
Residential Portfolio Segment [Member]
Loans	5,838,747	5,252,952
Equity Lines Portfolio Segment [Member]
Loans	245,919	324,548
Installment and Other Loans [Member ]
Loans	6,198	4,689
Less: Allowance for loan losses	$ (23)	$ (35)	$ (1)

Note 5 - Loans - Loans to Relat

Note 5 - Loans - Loans to Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at beginning of year	$ 33,217	$ 38,532
Additional loans made	20,160	25,050
Payment received	(7,670)	(30,365)
Balance at end of year	$ 45,707	$ 33,217

Note 5 - Loans - Average Balanc

Note 5 - Loans - Average Balance and Interest Income Recognized Related to Non-accrual Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Average Recorded Investment	$ 71,830	$ 71,371
Interest Income Recognized	321	435	$ 1,074
Non-accrual portfolio loans	66,681	68,854	65,846
Contractual interest due	6,270	4,620	4,032
Net interest foregone	5,949	4,185	$ 2,958
Commercial Portfolio Segment [Member]
Average Recorded Investment	18,008	28,109
Interest Income Recognized	3	4
Real Estate Construction Portfolio Segment [Member]
Average Recorded Investment	6,336	28,983
Interest Income Recognized	0	0
Commercial Real Estate Portfolio Segment [Member]
Average Recorded Investment	35,742	14,251
Interest Income Recognized	318	405
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Average Recorded Investment	11,743	28
Interest Income Recognized	0	$ 26
Installment and Other Loans [Member ]
Average Recorded Investment	1
Interest Income Recognized	$ 0

Note 5 - Loans - Nonaccrual Loa

Note 5 - Loans - Nonaccrual Loans and Related Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans with no related allowance, unpaid principal balance	$ 88,728	$ 74,673
Loans with no related allowance, recorded investment	66,681	54,140
Loans with related allowance, unpaid principal balance	0	16,539
Loans with related allowance, recorded investment	0	14,714
Allowance	0	3,941
Unpaid principal balance	88,728	91,212
Non-accrual loans	66,681	68,854
Commercial Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	26,310	27,341
Loans with no related allowance, recorded investment	14,404	12,949
Loans with related allowance, unpaid principal balance	0	14,643
Loans with related allowance, recorded investment	0	12,823
Allowance	0	3,734
Real Estate Construction Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	7,736
Loans with no related allowance, recorded investment	7,736
Commercial Real Estate Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	41,725	37,697
Loans with no related allowance, recorded investment	32,030	32,205
Loans with related allowance, unpaid principal balance	0	1,896
Loans with related allowance, recorded investment	0	1,891
Allowance	0	207
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans with no related allowance, unpaid principal balance	12,957	9,626
Loans with no related allowance, recorded investment	12,511	8,978
Loans with related allowance, unpaid principal balance	0
Loans with related allowance, recorded investment	0
Allowance	0
Installment and Other Loans [Member ]
Loans with no related allowance, unpaid principal balance	0	9
Loans with no related allowance, recorded investment	$ 0	$ 8

Note 5 - Loans - Aging of Loan

Note 5 - Loans - Aging of Loan Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans	$ 19,548,140	$ 18,254,024
Non-accrual loans	66,681	68,854
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	124,698	81,012
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	38,941	8,921
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	7,157	11,580
Financial Asset, Past Due [Member]
Loans	237,477	170,367
Non-accrual loans	66,681	68,854
Financial Asset, Not Past Due [Member]
Loans	19,310,663	18,083,657
Commercial Portfolio Segment [Member]
Loans	3,305,048	3,318,778
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	11,771	8,192
Commercial Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	7,770	3,235
Commercial Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	508	10,208
Commercial Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Loans	34,453	47,407
Non-accrual loans	14,404	25,772
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	3,270,595	3,271,371
Real Estate Construction Portfolio Segment [Member]
Loans	422,647	559,372
Real Estate Construction Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	25,389	0
Real Estate Construction Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	22,998	0
Real Estate Construction Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Real Estate Construction Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Loans	56,123	0
Non-accrual loans	7,736	0
Real Estate Construction Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	366,524	559,372
Commercial Real Estate Portfolio Segment [Member]
Loans	9,729,581	8,793,685
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	27,900	25,772
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	1,503	0
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	6,649	1,372
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Loans	68,082	61,240
Non-accrual loans	32,030	34,096
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	9,661,499	8,732,445
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Loans	6,084,666	5,577,500
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	59,606	47,043
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	6,670	5,685
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Financial Asset, Past Due [Member]
Loans	78,787	61,706
Non-accrual loans	12,511	8,978
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	6,005,879	5,515,794
Installment and Other Loans [Member ]
Loans	6,198	4,689
Installment and Other Loans [Member ] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	32	5
Installment and Other Loans [Member ] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	1
Installment and Other Loans [Member ] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Installment and Other Loans [Member ] \| Financial Asset, Past Due [Member]
Loans	32	14
Non-accrual loans	0	8
Installment and Other Loans [Member ] \| Financial Asset, Not Past Due [Member]
Loans	$ 6,166	$ 4,675

Note 5 - Loans - Troubled Debt

Note 5 - Loans - Troubled Debt Restructuring (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
No. of Contracts		15	5
Pre-modification		$ 11,980	$ 2,153
Post-modification	$ 2,872	11,946	2,153
Specific Reserve		427	0
Charge-offs		$ 0	$ 0
Commercial Portfolio Segment [Member]
No. of Contracts		4	3
Pre-modification		$ 6,115	$ 2,150
Post-modification	$ 2,650	6,115	2,150
Specific Reserve		427	0
Charge-offs		$ 0	$ 0
Commercial Real Estate Portfolio Segment [Member]
No. of Contracts		3
Pre-modification		$ 3,676
Post-modification		3,669
Specific Reserve		$ 0
Residential Mortgage and Equity Lines Portfolio Segment [Member]
No. of Contracts		8	2
Pre-modification		$ 2,189	$ 3
Post-modification		2,162	3
Specific Reserve		$ 0	0
Charge-offs			$ 0

Note 5 - Loans - Amortized Cost

Note 5 - Loans - Amortized Cost of Modified Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Modified	$ 2,872	$ 11,946	$ 2,153
Extended Maturity [Member]
Modified	222
Rate Reduction and Term Extension and Payment Deferral [Member]
Modified	2,650
Commercial Portfolio Segment [Member]
Modified	$ 2,650	$ 6,115	$ 2,150
% of total loans	0.08%
Weighted average rate reduction	1.10%
Weighted average term increase (Year)	2 years 2 months 12 days
Weighted average payment deferral (Year)	10 months 24 days
% of total loans	0.08%
Commercial Portfolio Segment [Member] \| Extended Maturity [Member]
Modified	$ 0
Commercial Portfolio Segment [Member] \| Rate Reduction and Term Extension and Payment Deferral [Member]
Modified	2,650
Residential Mortgage Loans [Member]
Modified	$ 222
% of total loans	0%
Weighted average rate reduction	0.10%
Weighted average term increase (Year)	0 years
Weighted average payment deferral (Year)	2 years
% of total loans	0%
Residential Mortgage Loans [Member] \| Extended Maturity [Member]
Modified	$ 222
Residential Mortgage Loans [Member] \| Rate Reduction and Term Extension and Payment Deferral [Member]
Modified	$ 0

Note 5 - Loans - Performance of

Note 5 - Loans - Performance of Modified Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Modified	$ 2,872
Financial Asset, Not Past Due [Member]
Modified	2,872
Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member]
Modified	2,650
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Modified	2,650
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Commercial Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	0
Residential Mortgage Loans [Member]
Modified	222
Residential Mortgage Loans [Member] \| Financial Asset, Not Past Due [Member]
Modified	222
Residential Mortgage Loans [Member] \| Financial Asset, 30 to 89 Days Past Due [Member]
Modified	0
Residential Mortgage Loans [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Modified	$ 0

Note 5 - Loans - Accruing Troub

Note 5 - Loans - Accruing Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Accruing Troubled Debt Restructuring [Member]
Accruing TDRs	$ 15,145
Accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs	7,560
Accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs	445
Accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs	7,140
Non-accruing Troubled Debt Restructuring [Member]
Accruing TDRs		$ 6,348
Non-accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs		6,348
Non-accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs		0
Non-accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs		0
Commercial Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member]
Accruing TDRs	2,588
Commercial Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs	2,588
Commercial Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs	0
Commercial Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs	0
Commercial Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member]
Accruing TDRs		3,629
Commercial Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs		3,629
Commercial Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs		0
Commercial Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs		0
Commercial Real Estate Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member]
Accruing TDRs	8,646	1,098
Commercial Real Estate Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs	2,791	1,098
Commercial Real Estate Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs	0	0
Commercial Real Estate Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs	5,855	0
Residential Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member]
Accruing TDRs	3,911
Residential Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs	2,181
Residential Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs	445
Residential Portfolio Segment [Member] \| Accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs	$ 1,285
Residential Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member]
Accruing TDRs		1,621
Residential Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Payment Deferral [Member]
Accruing TDRs		1,621
Residential Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Contractual Interest Rate Reduction [Member]
Accruing TDRs		0
Residential Portfolio Segment [Member] \| Non-accruing Troubled Debt Restructuring [Member] \| Rate Reduction and Payment Deferral [Member]
Accruing TDRs		$ 0

Note 5 - Loans - Loan Held for

Note 5 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans originated in current year	$ 3,724,618	$ 3,943,040
Loans originated year prior	3,581,730	3,489,846
Loans originated three years prior	3,052,314	1,905,136
Loans originated four years prior	1,588,314	1,908,992
Loans originated five years prior	1,686,965	1,530,238
Total, Loans Amortized Cost Basis by Origination Year Prior	3,571,544	3,138,606
Total, Revolving Loans	2,306,710	2,303,152
Total, Revolving Converted to Term Loans	25,225	28,373
Total loans	19,537,420	18,247,383
Loans originated in current year, write offs	0	212
Loans originated year prior, write offs	992	587
Loans originated three years prior, write offs	1,520	120
Loans originated four years prior, write offs	384	71
Loans originated five years prior, write offs	4,641	3,938
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	14,429	360
Total, Revolving Loans Write Offs	1,520	202
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	23,486	5,490
Total loans	19,537,420	18,247,383
Commercial Portfolio Segment [Member]
Loans originated in current year	387,945	489,985
Loans originated year prior	329,467	464,093
Loans originated three years prior	345,104	183,386
Loans originated four years prior	122,567	125,786
Loans originated five years prior	76,044	113,155
Total, Loans Amortized Cost Basis by Origination Year Prior	141,937	117,988
Total, Revolving Loans	1,890,712	1,816,937
Total, Revolving Converted to Term Loans	8,424	6,693
Total loans	3,302,200	3,318,023
Loans originated in current year, write offs	0	96
Loans originated year prior, write offs	977	587
Loans originated three years prior, write offs	1,312	120
Loans originated four years prior, write offs	384	71
Loans originated five years prior, write offs	3,672	1,786
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	6,044	360
Total, Revolving Loans Write Offs	1,520	202
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	13,909	3,222
Total loans	3,302,200	3,318,023
Commercial Portfolio Segment [Member] \| Pass [Member]
Loans originated in current year	381,705	488,748
Loans originated year prior	323,939	446,647
Loans originated three years prior	326,650	180,226
Loans originated four years prior	96,725	119,355
Loans originated five years prior	75,281	107,896
Total, Loans Amortized Cost Basis by Origination Year Prior	136,162	106,649
Total, Revolving Loans	1,775,162	1,753,509
Total, Revolving Converted to Term Loans	8,308	6,560
Total loans	3,123,932	3,209,590
Total loans	3,123,932	3,209,590
Commercial Portfolio Segment [Member] \| Special Mention [Member]
Loans originated in current year	4,488	1,212
Loans originated year prior	4,875	4,696
Loans originated three years prior	8,559	2,818
Loans originated four years prior	23,380	68
Loans originated five years prior	0	308
Total, Loans Amortized Cost Basis by Origination Year Prior	0	4,354
Total, Revolving Loans	75,419	41,110
Total, Revolving Converted to Term Loans	0	0
Total loans	116,721	54,566
Total loans	116,721	54,566
Commercial Portfolio Segment [Member] \| Substandard [Member]
Loans originated in current year	1,752	25
Loans originated year prior	653	12,750
Loans originated three years prior	9,895	342
Loans originated four years prior	2,462	4,859
Loans originated five years prior	763	2,766
Total, Loans Amortized Cost Basis by Origination Year Prior	5,775	6,985
Total, Revolving Loans	40,131	22,084
Total, Revolving Converted to Term Loans	116	133
Total loans	61,547	49,944
Total loans	61,547	49,944
Commercial Portfolio Segment [Member] \| Doubtful [Member]
Loans originated in current year	0	0
Loans originated year prior	0	0
Loans originated three years prior	0	0
Loans originated four years prior	0	1,504
Loans originated five years prior	0	2,185
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	0	234
Total, Revolving Converted to Term Loans	0	0
Total loans	0	3,923
Total loans	0	3,923
Real Estate Construction Portfolio Segment [Member]
Loans originated in current year	31,461	99,798
Loans originated year prior	131,984	264,557
Loans originated three years prior	165,684	122,761
Loans originated four years prior	44,850	33,858
Loans originated five years prior	21,034	35,321
Total, Loans Amortized Cost Basis by Origination Year Prior	26,129	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	421,142	556,295
Loans originated in current year, write offs	0	0
Loans originated year prior, write offs	0	0
Loans originated three years prior, write offs	0	0
Loans originated four years prior, write offs	0	0
Loans originated five years prior, write offs	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	4,221	0
Total, Revolving Loans Write Offs	0	0
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	4,221	0
Total loans	421,142	556,295
Real Estate Construction Portfolio Segment [Member] \| Pass [Member]
Loans originated in current year	29,550	99,798
Loans originated year prior	131,984	264,197
Loans originated three years prior	153,977	113,312
Loans originated four years prior	19,461	20,479
Loans originated five years prior	13,298	3,067
Total, Loans Amortized Cost Basis by Origination Year Prior	3,131	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	351,401	500,853
Total loans	351,401	500,853
Real Estate Construction Portfolio Segment [Member] \| Special Mention [Member]
Loans originated in current year	1,911	0
Loans originated year prior	0	360
Loans originated three years prior	11,707	9,449
Loans originated four years prior	25,389	11,643
Loans originated five years prior	0	22,945
Total, Loans Amortized Cost Basis by Origination Year Prior	22,998	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	62,005	44,397
Total loans	62,005	44,397
Real Estate Construction Portfolio Segment [Member] \| Substandard [Member]
Loans originated in current year	0	0
Loans originated year prior	0	0
Loans originated three years prior	0	0
Loans originated four years prior	0	1,736
Loans originated five years prior	7,736	9,309
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	7,736	11,045
Total loans	7,736	11,045
Commercial Real Estate Portfolio Segment [Member]
Loans originated in current year	2,159,093	2,122,120
Loans originated year prior	1,990,019	1,793,483
Loans originated three years prior	1,635,585	1,015,938
Loans originated four years prior	893,972	1,146,596
Loans originated five years prior	1,047,548	961,646
Total, Loans Amortized Cost Basis by Origination Year Prior	1,809,430	1,566,608
Total, Revolving Loans	185,985	182,347
Total, Revolving Converted to Term Loans	0	0
Total loans	9,721,632	8,788,738
Loans originated in current year, write offs	0	0
Loans originated year prior, write offs	0	0
Loans originated three years prior, write offs	208	0
Loans originated four years prior, write offs	0	0
Loans originated five years prior, write offs	969	2,152
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	4,164	0
Total, Revolving Loans Write Offs	0	0
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	5,341	2,152
Total loans	9,721,632	8,788,738
Commercial Real Estate Portfolio Segment [Member] \| Pass [Member]
Loans originated in current year	2,121,489	2,087,650
Loans originated year prior	1,959,239	1,728,607
Loans originated three years prior	1,585,010	975,953
Loans originated four years prior	887,508	1,094,505
Loans originated five years prior	1,019,952	908,748
Total, Loans Amortized Cost Basis by Origination Year Prior	1,726,015	1,420,982
Total, Revolving Loans	184,601	178,116
Total, Revolving Converted to Term Loans	0	0
Total loans	9,483,814	8,394,561
Total loans	9,483,814	8,394,561
Commercial Real Estate Portfolio Segment [Member] \| Special Mention [Member]
Loans originated in current year	37,604	22,150
Loans originated year prior	18,910	57,015
Loans originated three years prior	38,405	25,593
Loans originated four years prior	3,499	32,119
Loans originated five years prior	10,303	17,999
Total, Loans Amortized Cost Basis by Origination Year Prior	17,210	63,782
Total, Revolving Loans	1,384	1,600
Total, Revolving Converted to Term Loans	0	0
Total loans	127,315	220,258
Total loans	127,315	220,258
Commercial Real Estate Portfolio Segment [Member] \| Substandard [Member]
Loans originated in current year	0	12,320
Loans originated year prior	11,870	7,861
Loans originated three years prior	12,170	14,392
Loans originated four years prior	2,965	19,972
Loans originated five years prior	17,293	34,899
Total, Loans Amortized Cost Basis by Origination Year Prior	66,205	81,844
Total, Revolving Loans	0	2,631
Total, Revolving Converted to Term Loans	0	0
Total loans	110,503	173,919
Total loans	110,503	173,919
Residential Portfolio Segment [Member]
Loans originated in current year	1,141,005	1,228,597
Loans originated year prior	1,129,178	965,561
Loans originated three years prior	905,938	583,051
Loans originated four years prior	526,925	602,752
Loans originated five years prior	542,339	420,116
Total, Loans Amortized Cost Basis by Origination Year Prior	1,594,048	1,454,010
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	5,839,433	5,254,087
Loans originated in current year, write offs	0	0
Loans originated year prior, write offs	0	0
Loans originated three years prior, write offs	0	0
Loans originated four years prior, write offs	0	0
Loans originated five years prior, write offs	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0	0
Total, Revolving Loans Write Offs	0	0
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	0	0
Total loans	5,839,433	5,254,087
Residential Portfolio Segment [Member] \| Pass [Member]
Loans originated in current year	1,140,998	1,228,391
Loans originated year prior	1,128,526	964,799
Loans originated three years prior	902,613	580,990
Loans originated four years prior	524,315	600,786
Loans originated five years prior	541,005	417,565
Total, Loans Amortized Cost Basis by Origination Year Prior	1,583,118	1,444,320
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	5,820,575	5,236,851
Total loans	5,820,575	5,236,851
Residential Portfolio Segment [Member] \| Special Mention [Member]
Loans originated in current year	0	0
Loans originated year prior	0	0
Loans originated three years prior	0	33
Loans originated four years prior	33	0
Loans originated five years prior	0	752
Total, Loans Amortized Cost Basis by Origination Year Prior	1,619	905
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	1,652	1,690
Total loans	1,652	1,690
Residential Portfolio Segment [Member] \| Substandard [Member]
Loans originated in current year	7	206
Loans originated year prior	652	762
Loans originated three years prior	3,325	2,028
Loans originated four years prior	2,577	1,966
Loans originated five years prior	1,334	1,799
Total, Loans Amortized Cost Basis by Origination Year Prior	9,311	8,785
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	17,206	15,546
Total loans	17,206	15,546
Equity Lines Portfolio Segment [Member]
Loans originated in current year	0	748
Loans originated year prior	101	0
Loans originated three years prior	0	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	230,013	303,868
Total, Revolving Converted to Term Loans	16,801	21,680
Total loans	246,915	326,296
Loans originated in current year, write offs	0	0
Loans originated year prior, write offs	0	0
Loans originated three years prior, write offs	0	0
Loans originated four years prior, write offs	0	0
Loans originated five years prior, write offs	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0	0
Total, Revolving Loans Write Offs	0	0
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	0	0
Total loans	246,915	326,296
Equity Lines Portfolio Segment [Member] \| Pass [Member]
Loans originated in current year	0	731
Loans originated year prior	98	0
Loans originated three years prior	0	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	227,502	302,825
Total, Revolving Converted to Term Loans	16,628	21,460
Total loans	244,228	325,016
Total loans	244,228	325,016
Equity Lines Portfolio Segment [Member] \| Special Mention [Member]
Loans originated in current year	0	5
Loans originated year prior	3	0
Loans originated three years prior	0	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	3	5
Total loans	3	5
Equity Lines Portfolio Segment [Member] \| Substandard [Member]
Loans originated in current year	0	12
Loans originated year prior	0	0
Loans originated three years prior	0	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	2,511	1,043
Total, Revolving Converted to Term Loans	173	220
Total loans	2,684	1,275
Total loans	2,684	1,275
Installment and Other Loans [Member ]
Loans originated in current year	5,114	1,792
Loans originated year prior	981	2,152
Loans originated three years prior	3	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	6,098	3,944
Loans originated in current year, write offs	0	116
Loans originated year prior, write offs	15	0
Loans originated three years prior, write offs	0	0
Loans originated four years prior, write offs	0	0
Loans originated five years prior, write offs	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs	0	0
Total, Revolving Loans Write Offs	0	0
Total, Revolving Converted to Term Loans, Write Offs	0	0
YTD gross write-offs	15	116
Total loans	6,098	3,944
Installment and Other Loans [Member ] \| Pass [Member]
Loans originated in current year	5,114	1,792
Loans originated year prior	981	2,152
Loans originated three years prior	3	0
Loans originated four years prior	0	0
Loans originated five years prior	0	0
Total, Loans Amortized Cost Basis by Origination Year Prior	0	0
Total, Revolving Loans	0	0
Total, Revolving Converted to Term Loans	0	0
Total loans	6,098	3,944
Total loans	$ 6,098	$ 3,944

Note 5 - Loans - Allowance for

Note 5 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 146,485	$ 136,157
Provision/(reversal) for expected credit losses	25,655	12,913
Charge-offs	(23,486)	(5,490)
Recoveries	5,908	2,905
Net (Charge-offs)/Recoveries	(17,578)	(2,585)
Balance	154,562	146,485
Commitments to Extend Credit [Member]
Balance	8,730	7,100
Provision/(reversal) for expected credit losses	323	1,630
Balance	9,053	8,730
Commercial Portfolio Segment [Member]
Balance	49,435	43,394
Provision/(reversal) for expected credit losses	15,275	6,798
Charge-offs	(13,909)	(3,222)
Recoveries	2,990	2,465
Net (Charge-offs)/Recoveries	(10,919)	(757)
Balance	53,791	49,435
Commercial Portfolio Segment [Member] \| Commitments to Extend Credit [Member]
Balance	4,840	3,725
Provision/(reversal) for expected credit losses	2,048	1,115
Balance	6,888	4,840
Real Estate Construction Portfolio Segment [Member]
Balance	10,417	6,302
Provision/(reversal) for expected credit losses	1,984	4,109
Charge-offs	(4,221)	0
Recoveries	0	6
Net (Charge-offs)/Recoveries	(4,221)	6
Balance	8,180	10,417
Real Estate Construction Portfolio Segment [Member] \| Commitments to Extend Credit [Member]
Balance	3,890	3,375
Provision/(reversal) for expected credit losses	(1,725)	515
Balance	2,165	3,890
Commercial Real Estate Portfolio Segment [Member]
Balance	68,366	61,081
Provision/(reversal) for expected credit losses	8,570	9,079
Charge-offs	(5,341)	(2,152)
Recoveries	2,833	358
Net (Charge-offs)/Recoveries	(2,508)	(1,794)
Balance	74,428	68,366
Commercial Real Estate Portfolio Segment [Member] \| Commitments to Extend Credit [Member]
Balance	0	0
Provision/(reversal) for expected credit losses	0	0
Balance	0	0
Residential Mortgage and Equity Lines Portfolio Segment [Member]
Balance	18,232	25,379
Provision/(reversal) for expected credit losses	(177)	(7,221)
Charge-offs	0	0
Recoveries	85	74
Net (Charge-offs)/Recoveries	85	74
Balance	18,140	18,232
Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Commitments to Extend Credit [Member]
Balance	0	0
Provision/(reversal) for expected credit losses	0	0
Balance	0	0
Installment and Other Loans [Member ]
Balance	35	1
Provision/(reversal) for expected credit losses	3	148
Charge-offs	(15)	(116)
Recoveries	0	2
Net (Charge-offs)/Recoveries	(15)	(114)
Balance	23	35
Installment and Other Loans [Member ] \| Commitments to Extend Credit [Member]
Balance	0	0
Provision/(reversal) for expected credit losses	0	0
Balance	$ 0	$ 0

Note 6 - Investments in Affor_3

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Investments in Affordable Housing and Alternative Energy Partnerships	$ 315,700	$ 327,100
Number of Limited Partnerships Deemed to be Variable Interest Entities	11
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest	$ 25,300	31,300
Alternative Energy Tax Credit Partnership Investments, Net	19,943	37,208
Alternative Energy Tax Credit Partnership Investments, Held in Escrow	6,400	25,400
Asset Impairment Charges	4,296	4,145	$ 1,172
Affordable Housing Limited Partnerships [Member]
Asset Impairment Charges	7,700	$ 6,200
Domestic Tax Authority [Member]
Remaining and Future Available Tax Credit	249,600
State and Local Jurisdiction [Member]
Remaining and Future Available Tax Credit	$ 6,200

Note 6 - Investments in Affor_4

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Investments in Affordable Housing and Alternative Energy Partnerships (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investments in affordable housing partnerships, net	$ 295,740	$ 289,920
Other borrowings for affordable housing limited partnerships	15,787	22,600
Investments in affordable housing and alternative energy partnerships, unfunded commitments	106,452	133,491
Investments in alternative energy tax credit partnerships, net	$ 19,943	$ 37,208

Note 6 - Investments in Affor_5

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Unfunded Commitments Future Estimated Payments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
2024	$ 49,810
2025	34,871
2026	15,194
2027	1,400
2028	1,019
Thereafter	4,158
Total unfunded commitments	$ 106,452	$ 133,491

Note 6 - Investments in Affor_6

Note 6 - Investments in Affordable Housing and Alternative Energy Partnerships - Usage of Affordable Housing and Other Tax Credits Including Energy Tax Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Affordable housing and other tax credits recognized	$ 32,395	$ 29,524	$ 26,459
Alternative energy tax credits recognized	$ 41,320	$ 4,707	$ 6,337

Note 7 - Premises and Equipme_3

Note 7 - Premises and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Depreciation, Amortization and Accretion, Net	$ 7.1	$ 8	$ 7.7

Note 7 - Premises and Equipme_4

Note 7 - Premises and Equipment - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, plant, and equipment, gross	$ 211,730	$ 208,435
Less: Accumulated depreciation	120,633	113,659
Premises and equipment, net	91,097	94,776
Land and Land Improvements [Member]
Property, plant, and equipment, gross	42,566	42,566
Building and Building Improvements [Member]
Property, plant, and equipment, gross	81,796	81,613
Furniture Fixtures and Equipment [Member]
Property, plant, and equipment, gross	68,371	65,872
Leasehold Improvements [Member]
Property, plant, and equipment, gross	18,056	18,009
Construction in Progress [Member]
Property, plant, and equipment, gross	$ 941	$ 375

Note 8 - Goodwill and Other I_3

Note 8 - Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 07, 2022
Goodwill, Ending Balance	$ 375,696	$ 375,696
Amortization of Intangible Assets	1,310	1,892	$ 687
HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Goodwill, Ending Balance				$ 3,507
Core Deposits [Member]
Impairment of Intangible Assets, Finite-Lived	1,227	918
Amortization of Intangible Assets	1,300	1,900	687
Core Deposits [Member] \| Amortization of Core Deposit Intangibles [Member]
Impairment of Intangible Assets, Finite-Lived	$ 1,200	918	$ 0
Core Deposits [Member] \| HSBC Bank USA West Coast Mass Market Consumer and Retail Banking Business [Member]
Finite-Lived Intangible Assets Acquired		$ 3,100

Note 8 - Goodwill and Other I_4

Note 8 - Goodwill and Other Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Net carrying balance	$ 4,044
Core Deposits [Member]
Gross balance	10,562	$ 10,562
Accumulated amortization	(5,291)	(4,291)
Impairment	(1,227)	(918)
Net carrying balance	$ 4,044	$ 5,353

Note 8 - Goodwill and Other I_5

Note 8 - Goodwill and Other Intangible Assets - Maturity Schedule of Intangible Assets (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 1,001
2025	947
2026	870
2027	870
thereafter	356
Total	$ 4,044

Note 9 - Deposits (Details Text

Note 9 - Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deposit Liabilities, Accrued Interest	$ 28.6	$ 13.2	$ 1.7
Geographic Distribution, Domestic [Member]
Time Deposits, at or Above FDIC Insurance Limit	5,300	4,100
Geographic Distribution, Foreign [Member]
Time Deposits, at or Above FDIC Insurance Limit	$ 174.2	$ 128.6

Note 9 - Deposits - Deposit Bal

Note 9 - Deposits - Deposit Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Non-interest-bearing demand deposits	$ 3,529,018	$ 4,168,989
Interest bearing demand deposits	2,370,685	2,509,736
Money market deposits	3,049,754	3,812,724
Savings deposits	1,039,203	1,000,460
Time deposits	9,336,787	7,013,370
Total deposits	$ 19,325,447	$ 18,505,279

Note 9 - Deposits - Time Deposi

Note 9 - Deposits - Time Deposit Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Time deposits 2024	$ 9,312,877
Time deposits 2025	18,429
Time deposits 2026	3,203
Time deposits 2027	2,230
Time deposits 2028	23
Time deposits thereafter	25
Time deposits	$ 9,336,787

Note 9 - Deposits - Interest Ex

Note 9 - Deposits - Interest Expense on Time Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest bearing demand	$ 40,952	$ 8,176	$ 2,249
Money market accounts	86,097	39,913	18,241
Saving accounts	8,916	853	769
Time deposits	331,997	56,354	40,542
Total	$ 467,962	$ 105,296	$ 61,801

Note 10 - Borrowed Funds (Detai

Note 10 - Borrowed Funds (Details Textual) - USD ($) $ in Thousands					12 Months Ended
	Mar. 28, 2019	Nov. 23, 2014	Mar. 13, 2014	Nov. 23, 2004	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securities Sold under Agreements to Repurchase					$ 0	$ 0	$ 0
Advance from Federal Home Loan Bank					540,000	485,000
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds					6,600,000
Debt Securities, Available-for-Sale					1,604,570	1,473,348
Threshold for Deferred Bonus				$ 225
Amount of Deferred Bonus Accrued in Other Liabilities			$ 300	$ 610
Accrued Interest on Deferred Bonus	5.72%	5.06%	5.02%	7%
Accrued Bonuses					2,400	2,300
Interest Expense, Other					122	$ 116	110
Junior Subordinated Notes, Noncurrent					$ 119,100
Junior Subordinated Debt [Member]
Debt Instrument, Term (Year)					30 years
Debt Instrument, Interest Rate, Effective Percentage					7.54%	4.01%
Interest Expense, Debt					$ 6,500	$ 5,500	$ 5,800
Federal Home Loan Bank Securities [Member] \| Asset Not Pledged as Collateral [Member]
Debt Securities, Available-for-Sale					1,470,000
Mature in January 2024 [Member]
Advance from Federal Home Loan Bank					525,000
Mature in September 2024 [Member]
Advance from Federal Home Loan Bank					15,000
Ten-year Treasury Note [Member]
Debt Instrument, Basis Spread on Variable Rate		2.75%
Debt Instrument, Term (Year)		10 years
Five-year Treasury Note [Member]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Debt Instrument, Term (Year)	5 years
Over-night Borrowings [Member]
Advance from Federal Home Loan Bank					0	$ 150,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate						4.65%
Non Overnight Borrowings [Member]
Advance from Federal Home Loan Bank					$ 540,000	$ 335,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate					5.64%	4.54%

Note 11 - Capital Resources (De

Note 11 - Capital Resources (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		7 Months Ended	12 Months Ended
	Feb. 21, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 26, 2022	Dec. 31, 2020
Equity, Attributable to Parent		$ 2,474,040	$ 2,736,575	$ 2,474,040	$ 2,446,251		$ 2,418,144
Stockholders' Equity, Period Increase (Decrease)			$ 262,500
Stockholders' Equity, Period Increase (Decrease), Percentage			10.60%
Net Income (Loss) Attributable to Parent			$ 354,124	360,642	298,304
Other Comprehensive Income (Loss), Net of Tax			16,879	(99,230)	(8,375)
Share-Based Payment Arrangement, Expense			7,000
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan			3,491	3,720	3,563
Stock Issued During Period, Value, Issued for Services			850	849	850
Dividends, Common Stock, Cash			98,638	100,955	99,322
Treasury Stock, Value, Acquired, Cost Method	$ 16,600	$ 108,400	16,667	141,315	167,104
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 4,490	$ 2,905	$ 2,632
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)			$ 1.36	$ 1.36	$ 1.27
Stock Repurchase Program, Authorized Amount						$ 125,000
Treasury Stock, Shares, Acquired (in shares)	375,090	2,522,538		3,227,465
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 44.2	$ 42.98		$ 43.79
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense			$ 7,000	$ 7,000	$ 6,000
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 4,500

Note 11 - Capital Resources - O

Note 11 - Capital Resources - Outstanding Junior Subordinated Notes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	May 31, 2014
Junior subordinated debt	$ 119,136	$ 119,136	$ 119,100
Cathay Capital Trust I [Member]
Junior subordinated debt	$ 20,619	$ 20,619
current interest rate	8.81%	6.82%
coupon rate		3.15%
Cathay Capital Trust I [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
coupon rate	3.15%
Cathay Statutory Trust I [Member]
Junior subordinated debt	$ 20,619	$ 20,619
current interest rate	8.67%	6.53%
coupon rate		3%
Cathay Statutory Trust I [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
coupon rate	3%
Cathay Capital Trust II [Member]
Junior subordinated debt	$ 12,887	$ 12,887
current interest rate	8.56%	6.57%
coupon rate		2.90%
Cathay Capital Trust II [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
coupon rate	2.90%
Cathay Capital Trust III [Member]
Junior subordinated debt	$ 46,392	$ 46,392
current interest rate	7.15%	4.77%
coupon rate		1.48%
Cathay Capital Trust III [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
coupon rate	1.48%
Cathay Capital Trust IV [Member]
Junior subordinated debt	$ 18,619	$ 18,619
current interest rate	7.06%	4.54%
coupon rate		1.40%
Cathay Capital Trust IV [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
coupon rate	1.40%

Note 12 - Income Taxes (Details

Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Operating Loss Carryforwards	$ 3,787	$ 5,916
Deferred Tax Assets, Tax Credit Carryforwards, Other	7,500
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	1,000
Income Taxes Receivable	33,700	$ 16,700
Tax Credit Carryforward, Amount	15,900
Domestic Tax Authority [Member]
Operating Loss Carryforwards	2,300
Deferred Tax Assets, Operating Loss Carryforwards	$ 500
Domestic Tax Authority [Member] \| Internal Revenue Service (IRS) [Member]
Open Tax Year	2020 2021 2022 2023
State and Local Jurisdiction [Member] \| California Franchise Tax Board [Member]
Operating Loss Carryforwards	$ 33,500
Deferred Tax Assets, Operating Loss Carryforwards	$ 3,300
Open Tax Year	2019 2020 2021 2022 2023

Note 12 - Income Taxes - Compon

Note 12 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal	$ 5,428	$ 57,029	$ 29,955
State	48,812	56,953	44,416
Total Current	54,240	113,982	74,371
Federal	(1,676)	(1,776)	5,986
State	(3,106)	(312)	3,182
Total Deferred	(4,782)	(2,088)	9,168
Total income tax expense, amount	$ 49,458	$ 111,894	$ 83,539

Note 12 - Income Taxes - Deferr

Note 12 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loan loss allowance	$ 50,126	$ 47,673
Accrual for bonuses	4,636	2,591
Non-accrual interest	2,164	1,572
Write-down on equity securities and venture capital investments	2,018	1,975
Depreciation and amortization	765	0
State tax	5,693	6,251
Unrealized loss on securities available-for-sale, net	31,728	40,400
Tax credits carried forward	9,136	9,136
Net operating loss carried forward	3,787	5,916
Other, net	7,632	4,711
Gross deferred tax assets	117,685	120,225
Deferred loan costs	(9,687)	(10,025)
Depreciation and amortization	0	(2,856)
Unrealized gain on interest rate swaps	(838)	(1,364)
Unrealized gain on equity securities	(4,863)	0
Dividends on Federal Home Loan Bank common stock	(977)	(981)
Other, net	(3,916)	(3,506)
Gross deferred tax liabilities	(20,281)	(18,732)
Net deferred tax assets	$ 97,404	$ 101,493

Note 12 - Income Taxes - Income

Note 12 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Tax provision at Federal statutory rate, amount	$ 84,752	$ 99,233	$ 80,187
Tax provision at Federal statutory rate, percent	21%	21%	21%
State income taxes, net of Federal income tax benefit, amount	$ 36,107	$ 44,837	$ 37,602
State income taxes, net of Federal income tax benefit, percent	9%	9.50%	9.80%
Excess deduction for stock option and RSUs, amount	$ (586)	$ (140)	$ (20)
Excess deduction for stock option and RSUs, percent	(0.10%)	0%	0%
Low income housing and other tax credits, amount	$ (73,715)	$ (34,231)	$ (32,795)
Low income housing and other tax credits, percent	(18.30%)	(7.20%)	(8.60%)
Other, net, amount	$ 2,900	$ 2,195	$ (1,435)
Other, net, percent	0.70%	0.40%	(0.30%)
Total income tax expense, amount	$ 49,458	$ 111,894	$ 83,539
Total income tax expense, percent	12.30%	23.70%	21.90%

Note 13 - Stockholders' Equit_3

Note 13 - Stockholders' Equity and Earnings Per Share (Details Textual) - USD ($) shares in Thousands, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval	$ 420.4	$ 296.2
Preferred Stock, Shares Outstanding (in shares)	0
Preferred Stock, Shares Issued (in shares)	0

Note 13 - Stockholders' Equit_4

Note 13 - Stockholders' Equity and Earnings Per Share - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Beginning balance, loss, net of tax	$ 2,474,040	$ 2,446,251	$ 2,418,144
Total other comprehensive (loss)/income, net of tax	16,879	(99,230)	(8,375)
Ending balance, loss, net of tax	2,736,575	2,474,040	2,446,251
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Beginning balance, loss, net of tax	(104,832)	211
Net unrealized (losses)/gains arising during the period, pre-tax	24,315	(149,124)
Net unrealized (losses)/gains arising during the period, tax	7,786	(44,081)
Net unrealized (losses)/gains arising during the period, net of tax	16,529	(105,043)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	(3,000)	0
Reclassification adjustment for net losses/(gains) included in net income, tax	(887)	0
Reclassification adjustment for net losses/(gains) included in net income, net of tax	(2,113)	0
Total other comprehensive (loss)/income, pre-tax	27,315	(149,124)
Total other comprehensive (loss)/income, tax	8,673	(44,081)
Total other comprehensive (loss)/income, net of tax	18,642	(105,043)
Ending balance, loss, net of tax	(86,190)	(104,832)	211
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Beginning balance, loss, net of tax	2,537	(3,276)
Net unrealized (losses)/gains arising during the period, pre-tax	(2,503)	10,864
Net unrealized (losses)/gains arising during the period, tax	(740)	3,211
Net unrealized (losses)/gains arising during the period, net of tax	(1,763)	7,653
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	0	2,612
Reclassification adjustment for net losses/(gains) included in net income, tax	0	772
Reclassification adjustment for net losses/(gains) included in net income, net of tax	0	1,840
Total other comprehensive (loss)/income, pre-tax	(2,503)	8,252
Total other comprehensive (loss)/income, tax	(740)	2,439
Total other comprehensive (loss)/income, net of tax	(1,763)	5,813
Ending balance, loss, net of tax	774	2,537	(3,276)
AOCI Attributable to Parent [Member]
Beginning balance, loss, net of tax	(102,295)	(3,065)	5,310
Net unrealized (losses)/gains arising during the period, pre-tax	21,812	(138,260)
Net unrealized (losses)/gains arising during the period, tax	7,046	(40,870)
Net unrealized (losses)/gains arising during the period, net of tax	14,766	(97,390)
Reclassification adjustment for net losses/(gains) included in net income, pre-tax	(3,000)	2,612
Reclassification adjustment for net losses/(gains) included in net income, tax	(887)	772
Reclassification adjustment for net losses/(gains) included in net income, net of tax	(2,113)	1,840
Total other comprehensive (loss)/income, pre-tax	24,812	(140,872)
Total other comprehensive (loss)/income, tax	7,933	(41,642)
Total other comprehensive (loss)/income, net of tax	16,879	(99,230)	(8,375)
Ending balance, loss, net of tax	$ (85,416)	$ (102,295)	$ (3,065)

Note 13 - Stockholders' Equit_5

Note 13 - Stockholders' Equity and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 354,124	$ 360,642	$ 298,304
Basic EPS, income	$ 354,124	$ 360,642	$ 298,304
Basic EPS, income (in shares)	72,573,025	74,337,265	78,268,369
Basic EPS, income (in dollars per share)	$ 4.88	$ 4.85	$ 3.81
Effect of dilutive stock options and RSU (in shares)	289,603	327,470	302,269
Diluted EPS, income	$ 354,124	$ 360,642	$ 298,304
Diluted EPS, income (in shares)	72,862,628	74,664,735	78,570,638
Diluted EPS, income (in dollars per share)	$ 4.86	$ 4.83	$ 3.8

Note 14 - Commitments and Con_3

Note 14 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments To Extend Notional Amount	$ 3,808,620	$ 3,630,304
Commitments to Fund Fixed Rate Loans	130,300	93,100
Commitments to Fund Adjustable Rate Loans	$ 3,690,000	$ 3,540,000

Note 14 - Commitments and Con_4

Note 14 - Commitments and Contingencies - Financial Instruments With Off-balance Sheet Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commitments	$ 4,188,545	$ 3,975,541
Commitments to Extend Credit [Member]
Commitments	3,808,619	3,630,304
Standby Letters of Credit [Member]
Commitments	368,618	315,821
Commercial Letters of Credit [Member]
Commitments	$ 11,308	$ 29,416

Note 15 - Leases (Details Textu

Note 15 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
Note 15 - Leases (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Lease, Expense	$ 12.8	$ 13.1	$ 11.6

Note 15 - Leases - Operating Le

Note 15 - Leases - Operating Lease Related Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Right-of-use assets- operating leases	$ 32,076	$ 29,627
Lease liabilities - operating leases	$ 34,797	$ 32,518
Weighted-average remaining lease term (in years) (Year)	4 years 1 month 6 days	4 years
Weighted-average discount rate	3.80%	2.90%
Operating cash flows from operating leases	$ 11,400	$ 11,400
ROU assets obtained in exchange for lease obligations	$ 12,600	$ 5,900

Note 15 - Leases - Lease Maturi

Note 15 - Leases - Lease Maturity Schedule (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
2024	$ 10,800
2025	8,960
2026	7,297
2027	5,238
2028	3,916
Thereafter	1,403
Total lease payments	37,614
Less amount of payment representing interest	(2,817)
Lease liabilities - operating leases	$ 34,797	$ 32,518

Note 16 - Financial Derivativ_3

Note 16 - Financial Derivatives (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	May 31, 2014	Dec. 31, 2023	Dec. 31, 2022
Junior Subordinated Notes, Total	$ 119,100	$ 119,136	$ 119,136
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative Outstanding, Notional Amount	$ 119,100	650,900	595,400
Derivative, Notional Amount		38,600	50,000
Derivative Original Maturity (Year)	10 years
Deferred Gain on Early Termination of Derivative			4,000
Derivative, Gain on Derivative			772
Interest Rate Swap [Member] \| Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Central Counterparties (CCP) [Member]
Derivative, Notional Amount			205,600
Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative, Notional Amount		$ 1,156,007	874,034
Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Minimum [Member]
Derivative, Term of Contract (Year)		3 years
Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Maximum [Member]
Derivative, Term of Contract (Year)		10 years
Interest Rate Swap [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Central Counterparties (CCP) [Member]
Derivative, Notional Amount		$ 846,900	449,300
Derivative, Gain on Derivative		257	25,800
Interest Rate Contract [Member] \| Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative Outstanding, Notional Amount		88,500	204,300
Derivative, Notional Amount		4,200	6,600
Loans Receivable with Partial-term Hedging Designation [Member]
Derivative, Notional Amount		3,800	32,000
Hedged Asset, Fair Value Hedge		1,070,000	669,700
Loan, Notational Amount		1,780,000	1,210,000
Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease)		$ 2,000	$ 31,000

Note 16 - Financial Derivativ_4

Note 16 - Financial Derivatives - Cash Flow Swap Hedges (Details) - USD ($)		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net gain/(loss) (1)		$ (1,763,000)	$ 5,813,000	$ 3,614,000
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Notional		$ 1,156,007,000	$ 874,034,000
Weighted average fixed rate-pay		2.01%	2.12%
Weighted average variable rate spread		0.32%	0.68%
Weighted average variable rate-received		5.41%	2.61%
Net gain/(loss) (1)		$ 7,935	$ 38,589
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Notional		38,600,000	50,000,000
Periodic net settlement of swaps	[1]	$ 29,514,000	$ 3,107,000

[1]the amount of periodic net settlement of interest rate swaps was included in interest expense.

Note 16 - Financial Derivativ_5

Note 16 - Financial Derivatives - Not Designated as Hedging (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Foreign Exchange Forward [Member]
Notional	$ 0	$ 0
Spot, Forward, and Swap Contracts with Negative Fair Value [Member]
Notional	775,324	668,422
Forward, and swap contracts with positive fair value	39,010	50,467
Spot, Forward, and Swap Contracts with Positive Fair Value [Member]
Notional	752,250	765,639
Forward, and swap contracts with positive fair value	$ (38,807)	$ (50,962)

Note 17 - Fair Value Measurem_3

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) - USD ($) shares in Thousands, $ in Thousands	24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 19,441	$ 4,067
Class of Warrant or Right, Outstanding (in shares)	0
Minimum [Member]
Estimated Sales Cost Applied To Collateral	3%
Minimum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0425
Minimum [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.2014
Minimum [Member] \| Warrants Outstanding [Member]
Expected Life Of Warrants (Year)	1 year
Maximum [Member]
Estimated Sales Cost Applied To Collateral	6%
Maximum [Member] \| Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0511
Maximum [Member] \| Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.2769
Maximum [Member] \| Warrants Outstanding [Member]
Expected Life Of Warrants (Year)	6 years
Net of Estimated Disposal Costs [Member]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 19,400	$ 4,100

Note 17 - Fair Value Measurem_4

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities available-for-sale	$ 1,604,570	$ 1,473,348
Equity securities	40,406	22,158
Assets, fair value disclosure	1,699,623	1,540,447
Liabilities, fair value disclosure	45,937	52,806
Mutual Funds [Member]
Equity securities	5,585	5,509
Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,821	1,289
Other Equity Securities [Member]
Equity securities	33,000	15,360
Warrant [Member]
Assets, fair value disclosure	0	50
Interest Rate Swap [Member]
Assets, fair value disclosure	54,268	44,443
Liabilities, fair value disclosure	45,762	51,864
Foreign Exchange Contract [Member]
Assets, fair value disclosure	379	448
Liabilities, fair value disclosure	175	942
Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	495,300	240,500
Equity securities	40,406	22,158
Assets, fair value disclosure	535,706	262,658
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Mutual Funds [Member]
Equity securities	5,585	5,509
Fair Value, Inputs, Level 1 [Member] \| Preferred Stock of Government Sponsored Entities [Member]
Equity securities	1,821	1,289
Fair Value, Inputs, Level 1 [Member] \| Other Equity Securities [Member]
Equity securities	33,000	15,360
Fair Value, Inputs, Level 1 [Member] \| Warrant [Member]
Assets, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Interest Rate Swap [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 1 [Member] \| Foreign Exchange Contract [Member]
Assets, fair value disclosure		0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	1,109,270	1,232,848
Equity securities	0	0
Assets, fair value disclosure	1,163,917	1,277,739
Liabilities, fair value disclosure	45,937	52,806
Fair Value, Inputs, Level 2 [Member] \| Mutual Funds [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] \| Preferred Stock of Government Sponsored Entities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] \| Other Equity Securities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 2 [Member] \| Warrant [Member]
Assets, fair value disclosure	0	0
Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Assets, fair value disclosure	54,268	44,443
Liabilities, fair value disclosure	45,762	51,864
Fair Value, Inputs, Level 2 [Member] \| Foreign Exchange Contract [Member]
Assets, fair value disclosure	379	448
Liabilities, fair value disclosure	175	942
Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Equity securities	0	0
Assets, fair value disclosure	0	50
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Mutual Funds [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Preferred Stock of Government Sponsored Entities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Other Equity Securities [Member]
Equity securities	0	0
Fair Value, Inputs, Level 3 [Member] \| Warrant [Member]
Assets, fair value disclosure	0	50
Fair Value, Inputs, Level 3 [Member] \| Interest Rate Swap [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
Fair Value, Inputs, Level 3 [Member] \| Foreign Exchange Contract [Member]
Assets, fair value disclosure	0	0
Liabilities, fair value disclosure	0	0
US Treasury Securities [Member]
Securities available-for-sale	495,300	240,500
US Treasury Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	495,300	240,500
US Treasury Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	0	0
US Treasury Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
US Government Corporations and Agencies Securities [Member]
Securities available-for-sale	48,169	63,610
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	48,169	63,610
US Government Corporations and Agencies Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale	0	30,000
US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	0	30,000
US Government-sponsored Enterprises Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member]
Securities available-for-sale	786,723	867,094
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	786,723	867,094
Commercial Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Collateralized Mortgage Obligations [Member]
Securities available-for-sale	28,044	31,061
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	28,044	31,061
Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	0	0
Corporate Debt Securities [Member]
Securities available-for-sale	246,334	241,083
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available-for-sale	0	0
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available-for-sale	246,334	241,083
Corporate Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available-for-sale	$ 0	$ 0

Note 17 - Fair Value Measurem_5

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets, fair value disclosure		$ 1,699,623	$ 1,540,447
Total Losses		4,296	4,145	$ 1,172
Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		27,756	59,158
Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure		535,706	262,658
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure		1,163,917	1,277,739
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure		0	50
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		27,756	59,158
Impaired Loans [Member]
Total Losses		4,069	3,877	1,012
Impaired Loans [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		7,073	54,141
Impaired Loans [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		7,073	54,141
Impaired Loans [Member] \| Commercial Portfolio Segment [Member]
Total Losses		0	1,786	1,012
Impaired Loans [Member] \| Commercial Portfolio Segment [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		191	12,950
Impaired Loans [Member] \| Commercial Portfolio Segment [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Commercial Portfolio Segment [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Commercial Portfolio Segment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		191	12,950
Impaired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Total Losses		4,069	2,091	0
Impaired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		6,882	32,205
Impaired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Impaired Loans [Member] \| Commercial Real Estate Portfolio Segment [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		6,882	32,205
Impaired Loans [Member] \| Residential Mortgage and Equity Lines Portfolio Segment [Member]
Assets, fair value disclosure			8,978
Total Losses			0	0
Impaired Loans [Member] \| Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] \| Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] \| Residential Mortgage and Equity Lines Portfolio Segment [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure			8,978
Impaired Loans [Member] \| Installment and Other Loans [Member ]
Assets, fair value disclosure			8
Total Losses			0	0
Impaired Loans [Member] \| Installment and Other Loans [Member ] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] \| Installment and Other Loans [Member ] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value disclosure			0
Impaired Loans [Member] \| Installment and Other Loans [Member ] \| Fair Value, Inputs, Level 3 [Member]
Assets, fair value disclosure			8
Other Real Estate Owned [Member]
Total Losses	[1]	0	0	17
Other Real Estate Owned [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	20,446	4,328
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	0	0
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	0	0
Other Real Estate Owned [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure	[1]	20,446	4,328
Investments in Venture Capital [Member]
Total Losses		227	268	$ 143
Investments in Venture Capital [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		237	689
Investments in Venture Capital [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Investments in Venture Capital [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		0	0
Investments in Venture Capital [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Nonrecurring [Member]
Assets, fair value disclosure		$ 237	$ 689

[1]Other real estate owned balance of $14.4 million in the Consolidated Balance Sheets is net of estimated disposal costs.

Note 17 - Fair Value Measurem_6

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Securities available-for-sale		$ 1,604,570	$ 1,473,348
Equity securities		40,406	22,158
Warrants		54,268	90,451
Foreign exchange contracts with gain		124,452	72,996
Foreign exchange contracts with gain, fair value		379	448
Interest rate swaps		1,406,879	817,615
Interest rate swaps, fair value		54,268	44,443
Foreign exchange contracts with loss		101,378	170,213
Foreign exchange contracts with loss, fair value		175	942
Interest rate swaps		1,078,880	595,426
Interest rate swaps, fair value		45,762	51,864
Commitments to extend credit		3,808,620	3,630,304
Commitments to extend credit, fair value		(14,344)	(14,797)
Standby letters of credit		368,618	315,821
Standby letters of credit, fair value		(2,821)	(2,738)
Other letters of credit		11,308	29,416
Other letters of credit, fair value		(10)	(33)
Reported Value Measurement [Member]
Cash and due from banks		173,988	195,440
Short-term investments		654,813	966,962
Securities available-for-sale		1,604,570	1,473,348
Loans, net		19,382,858	18,100,898
Equity securities		40,406	22,158
Investment in Federal Home Loan Bank stock		17,746	17,250
Deposits		19,325,447	18,505,279
Advances from Federal Home Loan Bank		540,000	485,000
Other borrowings		15,787	22,600
Long-term debt		119,136	119,136
Reported Value Measurement [Member] \| Warrants [Member]
Warrants		0	50
Estimate of Fair Value Measurement [Member]
Cash and due from banks		173,988	195,440
Short-term investments		654,813	966,962
Securities available-for-sale		1,604,570	1,473,348
Loans, net	[1]	19,605,152	17,944,588
Equity securities		40,406	22,158
Investment in Federal Home Loan Bank stock		17,746	17,250
Deposits		19,347,070	18,572,387
Advances from Federal Home Loan Bank		536,996	482,737
Other borrowings		13,978	18,385
Long-term debt		72,304	68,231
Estimate of Fair Value Measurement [Member] \| Warrants [Member]
Warrants		$ 0	$ 50

[1]In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit price notion.

Note 17 - Fair Value Measurem_7

Note 17 - Fair Value Measurements and Fair Value of Financial Instruments - Fair Value Hierarchy of Financial Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Equity securities		$ 40,406	$ 22,158
Warrants		54,268	90,451
Fair Value, Inputs, Level 1 [Member]
Equity securities		40,406	22,158
Fair Value, Inputs, Level 2 [Member]
Equity securities		0	0
Fair Value, Inputs, Level 3 [Member]
Equity securities		0	0
Estimate of Fair Value Measurement [Member]
Cash and due from banks		173,988	195,440
Short-term investments		654,813	966,962
Loans, net	[1]	19,605,152	17,944,588
Equity securities		40,406	22,158
Investment in Federal Home Loan Bank stock		17,746	17,250
Deposits		19,347,070	18,572,387
Advances from Federal Home Loan Bank		536,996	482,737
Other borrowings		13,978	18,385
Long-term debt		72,304	68,231
Estimate of Fair Value Measurement [Member] \| Warrants [Member]
Warrants		0	50
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash and due from banks		173,988	195,440
Short-term investments		654,813	966,962
Loans, net	[1]	0	0
Equity securities		40,406	22,158
Investment in Federal Home Loan Bank stock		0	0
Deposits		0	0
Advances from Federal Home Loan Bank		0	0
Other borrowings		0	0
Long-term debt		0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Warrants [Member]
Warrants		0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash and due from banks		0	0
Short-term investments		0	0
Loans, net	[1]	0	0
Equity securities		0	0
Investment in Federal Home Loan Bank stock		17,746	17,250
Deposits		0	0
Advances from Federal Home Loan Bank		536,996	482,737
Other borrowings		0	0
Long-term debt		72,304	68,231
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Warrants [Member]
Warrants		0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash and due from banks		0	0
Short-term investments		0	0
Loans, net	[1]	19,605,152	17,944,588
Equity securities		0	0
Investment in Federal Home Loan Bank stock		0	0
Deposits		19,347,070	18,572,387
Advances from Federal Home Loan Bank		0	0
Other borrowings		13,978	18,385
Long-term debt		0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Warrants [Member]
Warrants		$ 0	$ 50

[1]In accordance with the prospective adoption of ASU 2016-01, the fair value of loans as of December 31, 2019 & 2018 was measured using an exit price notion.

Note 18 - Revenue From Contra_3

Note 18 - Revenue From Contracts With Clients - Summary of Revenue (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues		$ 43,912	$ 42,179	$ 39,074
Noninterest income, not in-scope(2)	[1],[2]	24,380	14,635	15,529
Total non-interest income		68,292	56,814	54,603
Fees and Services Charges on Deposit Account [Member]
Revenues		9,204	9,394	8,618
Wealth Management Fees [Member]
Revenues		17,506	16,436	15,056
Other Service Fees [Member]
Revenues	[1]	$ 17,202	$ 16,349	$ 15,400

[1]Other service fees comprise of fees related to letters of credit, wire fees, fees on foreign exchange transactions and other immaterial individual revenue streams.[2]These amounts primarily represent revenue from contracts with customers that are out of the scope of ASC Topic 606.

Note 19 - Employee Benefit Pl_2

Note 19 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended			43 Months Ended	255 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2021	May 31, 2018
Minimum Number of Years Allowed to Participate in Employee Stock Ownership Plan (Year)		2 years
Stock Issued During Period, Shares, Employee Stock Ownership Plan (in shares)	16,555	18,808	18,338
Stock Issued During Period, Value, Employee Stock Ownership Plan	$ 613	$ 814	$ 781
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares (in shares)	33,554	29,363	47,617	47,617
Employee Stock Ownership Plan (ESOP), Shares in ESOP (in shares)	676,594
Percentage of Outstanding Common Stock under Employee Stock Ownership Plan	0.93%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent					75%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, Less Than Two Years of Service					0%
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage, After Five Years of Service					100%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match				100%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay				5%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4,500	$ 3,900	$ 3,600
Percentage of Participant Borrowing Capacity of Vested Amount	50%
Cash Surrender Value of Life Insurance	$ 50,900	$ 49,900
Maximum [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service	50
Minimum [Member]
Employee Stock Ownership Plan (ESOP), Debt Structure, Direct Loan, Employer Cash Payments Used for Debt Service	$ 1

Note 20 - Equity Incentive Pl_3

Note 20 - Equity Incentive Plans (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement, Expense	$ 7
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 9.9	$ 9
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Payment Arrangement, Expense	$ 7	$ 7	$ 6
Performance-based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Performance-based Restricted Stock Units [Member] \| Minimum [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target	0%
Performance-based Restricted Stock Units [Member] \| Maximum [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Performance-based Restricted Stock Units, Number of Shares That May Vest, Percentage of Target	150%
2005 Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	1,456,944

Note 20 - Equity Incentive Pl_4

Note 20 - Equity Incentive Plans - Restricted Stock Units (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Time-based Restricted Stock Units [Member]
Balance (in shares)	202,059	235,944	292,670
Balance, weighted-average grant date fair value (in dollars per share)	$ 33.29	$ 32.38	$ 33.37
Granted (in shares)	86,809	67,652	63,467
Granted, weighted-average grant date fair value (in dollars per share)	$ 37.92	$ 46.69	$ 41.18
Vested (in shares)	(92,075)	(89,386)	(96,869)
Vested, weighted-average grant date fair value (in dollars per share)	$ 34.29	$ 40.92	$ 41.72
Forfeited (in shares)	(2,404)	(12,151)	(23,324)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 37.77	$ 34.07	$ 29.92
Balance (in shares)	194,389	202,059	235,944
Balance, weighted-average grant date fair value (in dollars per share)	$ 34.83	$ 33.29	$ 32.38
Performance-based Restricted Stock Units [Member]
Balance (in shares)	362,965	332,506	302,802
Balance, weighted-average grant date fair value (in dollars per share)	$ 31.56	$ 31.82	$ 32.55
Granted (in shares)	123,504	112,393	113,764
Granted, weighted-average grant date fair value (in dollars per share)	$ 38.41	$ 40.24	$ 37.13
Vested (in shares)	(136,808)	(81,934)	(76,292)
Vested, weighted-average grant date fair value (in dollars per share)	$ 34.21	$ 44.52	$ 41.69
Forfeited (in shares)	0	0	(7,768)
Forfeited, weighted-average grant date fair value (in dollars per share)	$ 0	$ 0	$ 40.85
Balance (in shares)	349,661	362,965	332,506
Balance, weighted-average grant date fair value (in dollars per share)	$ 32.94	$ 31.56	$ 31.82

Note 21 - Condensed Financial_3

Note 21 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 31, 2014
Assets
Equity securities	$ 40,406	$ 22,158
Other assets	267,762	250,069
Total assets	23,081,534	21,947,976
Liabilities
Junior subordinated debt	119,136	119,136			$ 119,100
Other liabilities	306,528	307,031
Total liabilities	20,344,959	19,473,936
Commitments and contingencies
Stockholders' equity
Common stock, $0.01 par value, 100,000,000 shares authorized, 91,392,480 issued and 72,668,927 outstanding at December 31, 2023, and 91,090,614 issued and 72,742,151 outstanding at December 31, 2022	914	911
Additional paid-in-capital	987,953	981,119
Accumulated other comprehensive income loss, net	(85,416)	(102,295)
Retained earnings	2,500,341	2,244,855
Total equity	2,736,575	2,474,040	$ 2,446,251	$ 2,418,144
Total liabilities and equity	23,081,534	21,947,976
Parent Company [Member]
Assets
Cash	24,262	14,902
Short-term certificates of deposit	335	334
Equity securities	34,441	16,360
Other assets	3,896	4,385
Total assets	2,869,469	2,603,011
Liabilities
Junior subordinated debt	119,136	119,136
Other liabilities	13,758	9,835
Total liabilities	132,894	128,971
Commitments and contingencies
Stockholders' equity
Common stock, $0.01 par value, 100,000,000 shares authorized, 91,392,480 issued and 72,668,927 outstanding at December 31, 2023, and 91,090,614 issued and 72,742,151 outstanding at December 31, 2022	914	911
Additional paid-in-capital	987,953	981,119
Accumulated other comprehensive income loss, net	(85,416)	(102,295)
Retained earnings	2,500,341	2,244,855
Treasury stock, at cost (18,723,553 shares at December 31, 2023, and 18,348,463 shares at December 31, 2022)	(667,217)	(650,550)
Total equity	2,736,575	2,474,040
Total liabilities and equity	2,869,469	2,603,011
Parent Company [Member] \| Bank Subsidiaries [Member]
Assets
Investment in subsidiaries	2,806,467	2,566,266
Parent Company [Member] \| Non Bank Subsidiaries [Member]
Assets
Investment in subsidiaries	$ 68	$ 764

Note 21 - Condensed Financial_4

Note 21 - Condensed Financial Information of Cathay General Bancorp - Balance Sheets (Details) (Parentheticals) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	91,392,480	91,090,614
Common stock, shares outstanding (in shares)	72,668,927	72,742,151
Treasury stock, shares (in shares)	18,723,553	18,348,463
Parent Company [Member]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	91,392,480	91,090,614
Common stock, shares outstanding (in shares)	72,668,927	72,742,151
Treasury stock, shares (in shares)	18,723,553	18,348,463

Note 21 - Condensed Financial_5

Note 21 - Condensed Financial Information of Cathay General Bancorp - Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest expense	$ 500,476	$ 117,584	$ 68,756
Non-interest expense	380,478	303,432	286,523
Income before income tax expense	403,582	472,536	381,843
Income tax expense/(benefit)	49,458	111,894	83,539
Net income	354,124	360,642	298,304
Parent Company [Member]
Cash dividends from Cathay Bank	134,000	232,773	230,000
Interest income	44	30	36
Interest expense	6,480	5,560	5,773
Non-interest Income	17,757	1,018	3,117
Non-interest expense	4,065	3,937	3,224
Income before income tax expense	141,256	224,324	224,156
Income tax expense/(benefit)	1,707	(2,885)	(1,810)
Income before undistributed earnings of subsidiaries	139,549	227,209	225,966
Undistributed earnings of subsidiary	214,575	133,433	72,338
Net income	$ 354,124	$ 360,642	$ 298,304

Note 21 - Condensed Financial_6

Note 21 - Condensed Financial Information of Cathay General Bancorp - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net income	$ 354,124	$ 360,642	$ 298,304
Gain on equity securities	(18,248)	(392)	1,426
Write-downs on venture capital and other investments	86,616	42,065	45,447
Net change in accrued interest receivable and other assets	(54,369)	(80,411)	(34,196)
Net change in other liabilities	(24,429)	107,467	2,403
Net cash provided by operating activities	384,742	467,390	334,317
Cash Flows from Investing Activities
Net cash used for investing activities	(1,477,080)	(1,849,433)	(859,924)
Cash Flows from Financing Activities
Cash dividends paid	(98,638)	(100,955)	(99,322)
Taxes paid related to net share settlement of RSUs	(4,490)	(2,905)	(2,632)
Purchase of treasury stock	(16,667)	(141,316)	(167,104)
Net cash provided by financing activities	758,737	94,741	1,554,233
(Decrease)/increase in cash, cash equivalents, and restricted cash	(333,601)	(1,287,302)	1,028,626
Cash, cash equivalents, and restricted cash, beginning of the year	1,162,402	2,449,704	1,421,078
Cash, cash equivalents, and restricted cash, end of the period	828,801	1,162,402	2,449,704
Parent Company [Member]
Cash Flows from Operating Activities
Net income	354,124	360,642	298,304
Equity in undistributed earnings of subsidiaries	(214,575)	(133,433)	(72,338)
Gain on equity securities	(17,977)	(733)	(122)
Write-downs on venture capital and other investments	179	268	73
Loss/(gain) in fair value of warrants	50	(27)	0
Stock issued to directors as compensation	850	849	850
Net change in accrued interest receivable and other assets	5,216	(434)	1,918
Net change in other liabilities	(2,371)	8,531	4,934
Net cash provided by operating activities	125,496	235,663	233,619
Cash Flows from Investing Activities
Venture capital and other investments	168	(5)	357
Net cash used for investing activities	168	(5)	357
Cash Flows from Financing Activities
Cash dividends paid	(98,638)	(100,955)	(99,322)
Proceeds from shares issued under the Dividend Reinvestment Plan	3,491	3,720	3,563
Taxes paid related to net share settlement of RSUs	(4,490)	(2,905)	(2,632)
Purchase of treasury stock	(16,667)	(141,316)	(167,104)
Net cash provided by financing activities	(116,304)	(241,456)	(265,495)
(Decrease)/increase in cash, cash equivalents, and restricted cash	9,360	(5,798)	(31,519)
Cash, cash equivalents, and restricted cash, beginning of the year	14,902	20,700	52,219
Cash, cash equivalents, and restricted cash, end of the period	$ 24,262	$ 14,902	$ 20,700

Note 22 - Dividend Reinvestme_2

Note 22 - Dividend Reinvestment Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares)	93,182	86,501	84,011
Stock Issued During Period, Value, Dividend Reinvestment Plan	$ 3,491	$ 3,719	$ 3,563

Note 23 - Regulatory Matters (D

Note 23 - Regulatory Matters (Details Textual)	Dec. 31, 2023	Dec. 31, 2022
Common Equity, Tier One Risk Based Capital Required to Be Well Capitalized to Risk Weighted Assets	6.50%	6.50%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.08	0.08
Capital Required to be Well Capitalized to Risk Weighted Assets	0.10	0.10
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	0.05	0.05

Note 23 - Regulatory Matters -

Note 23 - Regulatory Matters - Capital and Leverage Ratios (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Common Equity Tier 1 to Risk-Weighted Assets, Actual amount	$ 2,501,439,000	$ 2,276,830,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio	13.23%	12.75%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required	$ 1,323,846,000	$ 1,250,461,000
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required, Ratio	7%	7%
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,229,286,000	$ 1,161,142,000
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	6.50%	6.50%
Tier 1 Capital to Risk-Weighted Assets, Actual amount	$ 2,501,439,000	$ 2,276,830,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio	0.1323	0.1275
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required	$ 1,607,527,000	$ 1,518,417,000
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio	8.50%	8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,512,967,000	$ 1,429,098,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	0.08	0.08
Total Capital to Risk-Weighted Assets, Actual amount	$ 2,665,054,000	$ 2,432,045,000
Total Capital to Risk-Weighted Assets, Actual ratio	0.1409	0.1361
Total Capital to Risk-Weighted Assets, Minimum Capital Required	$ 1,985,769,000	$ 1,875,691,000
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio	10.50%	10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,891,209,000	$ 1,786,373,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	0.10	0.10
Leverage Ratio, Actual amount	$ 2,501,439,000	$ 2,276,830,000
Leverage Ratio, Actual ratio	0.1087	0.1053
Leverage Ratio, Minimum Capital Required	$ 920,670,000	$ 864,918,000
Leverage Ratio Minimum Capital Required, Ratio	0.04	0.04
Leverage Ratio, Required to be Considered Well Capitalized	$ 1,150,838,000	$ 1,081,148,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio	0.05	0.05
Bank [Member]
Common Equity Tier 1 to Risk-Weighted Assets, Actual amount	$ 2,430,773,000	$ 2,182,066,000
Common Equity Tier 1 to Risk-Weighted Assets, Actual ratio	12.84%	12.21%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required	$ 1,325,277	$ 1,250,914
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required, Ratio	7%	7%
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,230,615,000	$ 1,161,563,000
Common Equity Tier 1 to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	6.50%	6.50%
Tier 1 Capital to Risk-Weighted Assets, Actual amount	$ 2,430,773,000	$ 2,182,066,000
Tier 1 Capital to Risk-Weighted Assets, Actual ratio	0.1284	0.1221
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required	$ 1,609,265,000	$ 1,518,967,000
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio	8.50%	8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,514,602,000	$ 1,429,616,000
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	0.08	0.08
Total Capital to Risk-Weighted Assets, Actual amount	$ 2,709,888,000	$ 2,452,781,000
Total Capital to Risk-Weighted Assets, Actual ratio	0.1431	0.1373
Total Capital to Risk-Weighted Assets, Minimum Capital Required	$ 1,987,916,000	$ 1,876,371,000
Total Capital to Risk-Weighted Assets, Minimum Capital Required, Ratio	10.50%	10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized	$ 1,893,253,000	$ 1,787,020,000
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio	0.10	0.10
Leverage Ratio, Actual amount	$ 2,430,773,000	$ 2,182,066,000
Leverage Ratio, Actual ratio	0.1055	0.1008
Leverage Ratio, Minimum Capital Required	$ 921,473,000	$ 865,470,000
Leverage Ratio Minimum Capital Required, Ratio	0.04	0.04
Leverage Ratio, Required to be Considered Well Capitalized	$ 1,151,841,000	$ 1,081,838,000
Leverage Ratio Required to be Considered Well Capitalized, Ratio	0.05	0.05

Note 24 - Balance Sheet Offse_3

Note 24 - Balance Sheet Offsetting - Financial Instruments That Are Eligible for Offset in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivative assets, gross	$ 54,268	$ 90,451
Derivatives, Gross Amounts Offset in the Balance Sheet	335	46,008
Derivative assets, net	53,933	44,443
Derivatives, collateral posted	44,860	42,930
Derivative assets not offset	9,073	1,513
Derivative liabilities, gross	45,762	51,864
Derivatives, Gross Amounts Offset in the Balance Sheet	0	0
Derivative liabilities, net	45,762	51,864
Derivatives, collateral posted	0	0
Derivative liabilities not offset	$ 45,762	$ 51,864

Note 25 - Subsequent Events (De

Note 25 - Subsequent Events (Details Textual) - Subsequent Event [Member]	Feb. 15, 2024 $ / shares
Dividends Payable, Amount Per Share (in dollars per share)	$ 0.34
Dividends Payable, Date to be Paid	Mar. 11, 2024
Dividends Payable, Date of Record	Feb. 28, 2024