Westamerica Bancorporation (WABC) 10-K 28 Feb 24 2023 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 15, 2024	Jun. 30, 2023
Document Information [Line Items]
Entity Central Index Key	0000311094
Entity Registrant Name	WESTAMERICA BANCORPORATION
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	001-09383
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	94-2156203
Entity Address, Address Line One	1108 FIFTH AVENUE
Entity Address, City or Town	SAN RAFAEL
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94901
City Area Code	707
Local Phone Number	863-6000
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	WABC
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			$ 687,093,519
Entity Common Stock, Shares Outstanding		26,671,215
Auditor Name	Crowe LLP
Auditor Firm ID	173
Auditor Location	Sacramento, California

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets:
Cash and due from banks	$ 190,314	$ 294,236
Debt securities available for sale	3,999,801	4,331,743
Debt securities held to maturity, net of allowance for credit losses of $1 at December 31, 2023 and $1 at December 31, 2022 (Fair value of $849,562 at December 31, 2023 and $873,511 at December 31, 2022)	878,396	915,913
Loans	866,602	958,488
Allowance for credit losses on loans	(16,867)	(20,284)
Loans, net of allowance for credit losses on loans	849,735	938,204
Premises and equipment, net	27,016	28,819
Identifiable intangibles, net	347	583
Goodwill	121,673	121,673
Other assets	297,310	319,146
Total Assets	6,364,592	6,950,317
Liabilities:
Noninterest-bearing deposits	2,605,844	2,947,277
Interest-bearing deposits	2,868,423	3,278,013
Total deposits	5,474,267	6,225,290
Short-term borrowed funds	58,162	57,792
Other liabilities	59,269	65,125
Total Liabilities	5,591,698	6,348,207
Contingencies (Note 12)
Shareholders' Equity:
Common stock (no par value), authorized - 150,000 shares Issued and outstanding: 26,671 at December 31, 2023 and 26,913 at December 31, 2022	473,136	475,086
Deferred compensation	35	35
Accumulated other comprehensive loss	(190,282)	(256,105)
Retained earnings	490,005	383,094
Total Shareholders' Equity	772,894	602,110
Total Liabilities and Shareholders' Equity	$ 6,364,592	$ 6,950,317

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) shares in Thousands, $ / shares in Thousands, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt securities held to maturity, allowance for credit losses	$ 1	$ 1
Debt securities held to maturity, fair value	$ 849,562	$ 873,511
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	150,000	150,000
Common stock, issued (in shares)	26,671	26,913
Common stock, outstanding (in shares)	26,671	26,913

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and Loan Fee Income:
Loans	$ 47,116	$ 49,682	$ 57,558
Nonmarketable equity securities	630	537	458
Debt securities available for sale	190,039	144,646	105,420
Debt securities held to maturity	35,557	19,101	8,875
Interest-bearing cash	10,671	7,790	1,132
Total Interest and Loan Fee Income	284,013	221,756	173,443
Interest Expense:
Deposits	3,770	1,846	1,877
Short-term borrowed funds	120	79	78
Total Interest Expense	3,890	1,925	1,955
Net Interest and Loan Fee Income	280,123	219,831	171,488
Reversal of Provision for Credit Losses	(1,150)	0	0
Net Interest and Loan Fee Income After Provision For Credit Losses	281,273	219,831	171,488
Noninterest Income:
Life insurance gains	279	930	0
Securities (losses) gains	(125)	0	34
Other noninterest income	2,893	2,598	2,926
Total Noninterest Income	43,522	45,121	43,345
Noninterest Expense:
Salaries and related benefits	47,871	46,125	48,011
Occupancy and equipment	20,520	19,884	19,139
Outsourced data processing services	9,846	9,684	9,601
Limited partnership operating losses	5,754	5,724	2,620
Courier service	2,652	2,614	2,177
Professional fees	1,751	2,628	3,253
Other noninterest expense	14,822	12,702	13,005
Total Noninterest Expense	103,216	99,361	97,806
Income Before Income Taxes	221,579	165,591	117,027
Provision for income taxes	59,811	43,557	30,518
Net Income	$ 161,768	$ 122,034	$ 86,509
Average Common Shares Outstanding (in shares)	26,703	26,895	26,855
Diluted Average Common Shares Outstanding (in shares)	26,706	26,907	26,870
Per Common Share Data:
Basic earnings (in dollars per share)	$ 6.06	$ 4.54	$ 3.22
Diluted earnings (in dollars per share)	6.06	4.54	3.22
Dividends paid (in dollars per share)	$ 1.72	$ 1.68	$ 1.65
Deposit Account [Member]
Noninterest Income:
Noninterest income revenue	$ 14,169	$ 14,490	$ 13,697
Credit Card, Merchant Discount [Member]
Noninterest Income:
Noninterest income revenue	11,280	11,623	11,998
Debit Card [Member]
Noninterest Income:
Noninterest income revenue	7,185	7,879	6,859
Fiduciary and Trust [Member]
Noninterest Income:
Noninterest income revenue	3,122	3,216	3,311
ATM Processing Fees [Member]
Noninterest Income:
Noninterest income revenue	2,618	2,160	2,280
Financial Service, Other [Member]
Noninterest Income:
Noninterest income revenue	1,765	1,808	1,884
Financial Services Commission [Member]
Noninterest Income:
Noninterest income revenue	$ 336	$ 417	$ 356

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 161,768	$ 122,034	$ 86,509
Other comprehensive income (loss):
Changes in net unrealized losses/gains on debt securities available for sale	93,326	(434,107)	(91,891)
Deferred tax (expense) benefit	(27,591)	128,338	27,167
Reclassification of losses (gains) included in net income	125	0	(34)
Deferred tax (benefit on losses) expense on gains included in net income	(37)	0	10
Changes in unrealized losses/gains on debt securities available for sale, net of tax	65,823	(305,769)	(64,748)
Total Comprehensive Income (Loss)	$ 227,591	$ (183,735)	$ 21,761

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Deferred Compensation, Share-Based Payments [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2020	26,807
Balance at Dec. 31, 2020	$ 466,006	$ 35	$ 114,412	$ 264,356	$ 844,809
Net Income				86,509	86,509
Other comprehensive income (loss)			(64,748)		$ (64,748)
Exercise of stock options (in shares)	53				53
Exercise of stock options	$ 3,017				$ 3,017
Restricted stock activity (in shares)	9
Restricted stock activity	$ 526				526
Stock based compensation	$ 1,419				1,419
Stock awarded to employees (in shares)	1
Stock awarded to employees	$ 106				106
Retirement of common stock (in shares)	(4)
Retirement of common stock	$ (66)			(166)	(232)
Dividends				(44,304)	(44,304)
Balance (in shares) at Dec. 31, 2021	26,866
Balance at Dec. 31, 2021	$ 471,008	35	49,664	306,395	827,102
Net Income				122,034	122,034
Other comprehensive income (loss)			(305,769)		$ (305,769)
Exercise of stock options (in shares)	40				40
Exercise of stock options	$ 2,255				$ 2,255
Restricted stock activity (in shares)	8
Restricted stock activity	$ 492				492
Stock based compensation	$ 1,309				1,309
Stock awarded to employees (in shares)	2
Stock awarded to employees	$ 87				87
Retirement of common stock (in shares)	(3)
Retirement of common stock	$ (65)			(153)	(218)
Dividends				(45,182)	(45,182)
Balance (in shares) at Dec. 31, 2022	26,913
Balance at Dec. 31, 2022	$ 475,086	35	(256,105)	383,094	602,110
Net Income				161,768	161,768
Other comprehensive income (loss)			65,823		$ 65,823
Exercise of stock options (in shares)	22				22
Exercise of stock options	$ 950				$ 950
Restricted stock activity (in shares)	9
Restricted stock activity	$ 508				508
Stock based compensation	$ 1,356				1,356
Stock awarded to employees (in shares)	1
Stock awarded to employees	$ 80				80
Retirement of common stock (in shares)	(274)
Retirement of common stock	$ (4,844)			(8,903)	(13,747)
Dividends				(45,954)	(45,954)
Balance (in shares) at Dec. 31, 2023	26,671
Balance at Dec. 31, 2023	$ 473,136	$ 35	$ (190,282)	$ 490,005	$ 772,894

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividends per share (in dollars per share)	$ 1.72	$ 1.68	$ 1.65

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 161,768	$ 122,034	$ 86,509
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization/accretion	11,774	16,565	16,617
Reversal of Provision for Credit Losses	(1,150)	0	0
Net amortization of deferred loan fees	(573)	(1,704)	(5,576)
Stock option compensation expense	1,356	1,309	1,419
Life insurance gains	(279)	(930)	0
Securities losses (gains)	125	0	(34)
Net changes in:
Interest income receivable	(1,010)	(18,037)	(2,499)
Net deferred taxes	(1,995)	697	3,899
Other assets	(3,443)	(2,415)	(3,534)
Income taxes payable	(869)	3,020	(1,054)
Interest expense payable	(12)	(10)	(72)
Other liabilities	(7,484)	(6,827)	(6,940)
Net Cash Provided by Operating Activities	158,208	113,702	88,735
Investing Activities:
Net repayments of loans	90,192	108,107	193,755
Proceeds from life insurance policies	604	3,041	0
Purchases of debt securities available for sale	0	(636,228)	(1,909,370)
Proceeds from sale/maturity/calls of debt securities available for sale	416,447	500,160	1,204,455
Purchases of debt securities held to maturity	0	(718,940)	0
Proceeds from maturity/calls of debt securities held to maturity	43,518	111,059	206,400
Purchase of Federal Reserve Bank stock	(2,326)	0	0
Proceeds from redemption of Federal Reserve Bank stock	0	2,326	0
Purchases of premises and equipment	(1,161)	(811)	(1,324)
Net Cash Provided by (Used in) Investing Activities	547,274	(631,286)	(306,084)
Financing Activities:
Net change in deposits	(751,023)	(188,666)	725,977
Net change in short-term borrowings	370	(88,454)	43,701
Exercise of stock options	950	2,255	3,017
Retirement of common stock	(13,747)	(218)	(232)
Common stock dividends paid	(45,954)	(45,182)	(44,304)
Net Cash (Used in) Provided by Financing Activities	(809,404)	(320,265)	728,159
Net Change In Cash and Due from Banks	(103,922)	(837,849)	510,810
Cash and Due from Banks at Beginning of Period	294,236	1,132,085	621,275
Cash and Due from Banks at End of Period	190,314	294,236	1,132,085
Supplemental disclosure of noncash activities:
Right-of-use assets acquired in exchange for operating lease liabilities	8,866	3,533	5,105
Supplemental disclosure of cash flow activities:
Cash paid for amounts included in operating lease liabilities	6,217	6,037	6,309
Interest paid for the period	3,902	1,935	2,027
Income tax payments for the period	$ 64,017	$ 39,840	$ 27,673

Note 1 - Business and Accountin

Note 1 - Business and Accounting Policies	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Significant Accounting Policies [Text Block]	Note 1: Westamerica Bancorporation, a registered bank holding company (the “Company”), provides a full range of banking services to corporate and individual customers in Northern and Central California through its wholly-owned subsidiary bank, Westamerica Bank (the “Bank”). The Bank is subject to competition from both financial and nonfinancial institutions and to the regulations of certain agencies and undergoes periodic examinations by those regulatory authorities. All of the financial service operations are considered by management to be aggregated in one The Company has evaluated events and transactions subsequent to the balance sheet date. Based on this evaluation, the Company is not Management continues to actively evaluate the impacts of inflation, the Federal Reserve’s monetary policy and climate changes on the Company’s business. During the first 2023, one Summary of Significant Accounting Policies The consolidated financial statements are prepared in conformity with accounting principles generally accepted in the United States of America. The accounting policies, along with the disclosures presented in the other financial statement notes and in this discussion, provide information on how significant assets and liabilities are valued in the financial statements and how those values are determined. Based on the valuation techniques used and the sensitivity of financial statement amounts to the methods, assumptions, and estimates underlying those amounts, it is reasonably possible conditions could change materially affecting results of operations and financial conditions. The following is a summary of significant policies used in the preparation of the accompanying financial statements. Accounting Estimates. Certain accounting policies underlying the preparation of these financial statements require Management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, the financial statements could reflect different estimates, assumptions, and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Estimates, assumptions, and judgments are necessary when assets and liabilities are required to be recorded at fair value, when a decline in fair value of an asset not third may Principles of Consolidation. The consolidated financial statements include the accounts of the Company and all the Company’s subsidiaries. Significant intercompany transactions have been eliminated in consolidation. The Company does not Cash. Cash includes Due From Banks balances which are readily convertible to known amounts of cash and are generally 90 Equity Securities. Equity securities consist of marketable equity securities and mutual funds which are recorded at fair value. Unrealized gains and losses are included in net income. There were no equity securities at December 31, 2023 December 31, 2022. Debt Securities. Debt securities consist of the securities of government sponsored entities, states, counties, municipalities, corporations, agency and non-agency mortgage-backed securities, collateralized loan obligations and commercial paper. Securities transactions are recorded on a trade date basis. The Company classifies its debt securities in one three not not The Company utilizes third 1 2 third one third third not 3 The Company follows the guidance issued by the Board of Governors of the Federal Reserve System, “Investing in Securities without Reliance on Nationally Recognized Statistical Rating Agencies” (SR 12 15 To the extent that debt securities in the held-to-maturity portfolio share common risk characteristics, estimated expected credit losses are calculated in a manner like that used for loans held for investment. That is, for pools of such securities with common risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical credit losses. Expected credit loss on each security in the held-to-maturity portfolio that do not may not Available for sale debt securities in unrealized loss positions are evaluated for credit related loss at least quarterly. For available for sale debt securities, a decline in fair value due to credit loss results in recording an allowance for credit losses to the extent the fair value is less than the amortized cost basis. Declines in fair value that have not not not not If the Company intends to sell a debt security or more likely than not Purchase premiums are amortized to the earliest call date and purchase discounts are amortized to maturity as an adjustment to yield using the effective interest method. Unamortized premiums, unaccreted discounts, and early payment premiums are recognized as a component of gain or loss on sale upon disposition of the related security. Interest and dividend income are recognized when earned. Realized gains and losses from the sale of available for sale debt securities are included in earnings using the specific identification method. Nonmarketable Equity Securities. Nonmarketable equity securities include securities that are not Loans. Loans are stated at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. Interest is accrued daily on the outstanding principal balances and included in other assets. Loans which are more than 90 days delinquent with respect to interest or principal, unless they are well secured and in the process of collection, and other loans on which full recovery of principal or interest is in doubt, are placed on nonaccrual status. Interest previously accrued on loans placed on nonaccrual status is charged against interest income. In addition, some loans secured by real estate and commercial loans to borrowers experiencing financial difficulties are placed on nonaccrual status even though the borrowers continue to repay the loans as scheduled. When the ability to fully collect nonaccrual loan principal is in doubt, payments received are applied against the principal balance of the loans on a cost-recovery method until such time as full collection of the remaining recorded balance is expected. Any additional interest payments received after that time are recorded as interest income on a cash basis. Nonaccrual loans are reinstated to accrual status when none Allowance for Credit Losses. The Company extends loans to commercial and consumer customers primarily in Northern and Central California. These lending activities expose the Company to the risk borrowers will default, causing loan losses. The Company’s lending activities are exposed to various qualitative risks. All loan segments are exposed to risks inherent in the economy and market conditions. Significant risk characteristics related to the commercial loan segment include the borrowers’ business performance and financial condition, and the value of collateral for secured loans. Significant risk characteristics related to the commercial real estate segment include the borrowers’ business performance and the value of properties collateralizing the loans. Significant risk characteristics related to the construction loan segment include the borrowers’ performance in successfully developing the real estate into the intended purpose and the value of the property collateralizing the loans. Significant risk characteristics related to the residential real estate segment include the borrowers’ financial wherewithal to service the mortgages and the value of the property collateralizing the loans. Significant risk characteristics related to the consumer loan segment include the financial condition of the borrowers and the value of collateral securing the loans. The preparation of these financial statements requires Management to estimate the amount of expected losses over the expected contractual life of the Bank’s existing loan portfolio and establish an allowance for credit losses. Loan agreements generally include a maturity date, and the Company considers the contractual life of a loan agreement to extend from the date of origination to the contractual maturity date. In estimating credit losses, Management must exercise significant judgment in evaluating information deemed relevant. The amount of ultimate losses on the loan portfolio can vary from the estimated amounts. Management follows a systematic methodology to estimate loss potential in an effort to reduce the differences between estimated and actual losses. The allowance for credit losses is established through provisions for credit losses charged to income. Losses on loans are charged to the allowance for credit losses when all or a portion of the recorded amount of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the allowance when realized. The Company’s allowance for credit losses is maintained at a level considered adequate to provide for expected losses based on historical loss rates adjusted for current and expected conditions over a forecast period. These include conditions unique to individual borrowers, as well as overall credit loss experience, the amount of past due, nonperforming and classified loans, recommendations of regulatory authorities, prevailing economic conditions, or credit protection agreements and other factors. Loans that share common risk characteristics are segregated into pools based on common characteristics, which is primarily determined by loan, borrower, or collateral type. Historical loss rates are determined for each pool. For consumer installment loans, primarily secured by automobiles, historical loss rates are determined using a vintage methodology, which tracks losses based on period of origination. For commercial, construction, and commercial real estate, historical loss rates are determined using an open pool methodology where losses are tracked over time for all loans included in the pool at the historical measurement date. Historical loss rates are adjusted for factors that are not not two not not two Loans that do not not Accrued interest is recorded in other assets and is excluded from the estimation of expected credit loss. Accrued interest is reversed through interest income when amounts are determined to be uncollectible, which generally occurs when the underlying receivable is placed on nonaccrual status or charged off. Liability for Off-Balance Sheet Credit Exposures. Off-balance sheet credit exposures relate to letters of credit and unfunded loan commitments for commercial, construction and consumer loans. The Company maintains a separate allowance for credit losses from off-balance-sheet credit exposures, which is included within other liabilities on the consolidated statements of financial condition. Increases or reductions to the Company’s allowance for credit losses from off-balance sheet credit exposures are recorded in other expenses. Management estimates the amount of expected losses by estimating expected usage exposures that are not No may Nonrefundable fees and certain costs associated with originating or acquiring loans are deferred and amortized as an adjustment to interest income over the contractual loan lives. Upon prepayment, unamortized loan fees, net of costs, are immediately recognized in interest income. Other fees, including those collected upon principal prepayments, are included in interest income when received. Loans held for sale are identified upon origination and are reported at the lower of cost or market value on an aggregate loan basis. Other Real Estate Owned. Other real estate owned is comprised of property acquired through foreclosure proceedings, acceptances of deeds-in-lieu of foreclosure and, if applicable, vacated bank properties. Losses recognized at the time of acquiring property in full or partial satisfaction of debt are charged against the allowance for credit losses. Other real estate owned is recorded at the fair value of the collateral, generally based upon an independent property appraisal, less estimated disposition costs. Losses incurred subsequent to acquisition due to any decline in annual independent property appraisals are recognized as noninterest expense. Routine holding costs, such as property taxes, insurance and maintenance, and losses from sales and dispositions, are recognized as noninterest expense. Premises and Equipment. Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed substantially on the straight-line method over the estimated useful life of each type of asset. Estimated useful lives of premises and equipment range from 20 to 50 years and from 3 to 20 years, respectively. Leasehold improvements are amortized over the terms of the lease or their estimated useful life, whichever is shorter. Revenue Recognition. The Company recognizes revenue as it is earned based on contractual terms, as transactions occur, or as services are provided and collectability is reasonably assured. In certain circumstances, noninterest income is reported net of associated expenses that are directly related to variable volume-based sales or revenue sharing arrangements or when the Company acts on an agency basis for others. Life Insurance Cash Surrender Value. The Company has purchased life insurance policies on certain directors and officers as well as acquired such assets as part of the acquisition of other banks. Company owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. These assets are included in other assets on the consolidated balance sheets. Intangible Assets. Intangible assets are comprised of goodwill, core deposit intangibles and other identifiable intangibles acquired in business combinations. Intangible assets with finite useful lives are amortized on an accelerated basis over their respective estimated useful lives not not not not Impairment of Long-Lived Assets. The Company reviews its long-lived and certain intangible assets for impairment whenever events or changes indicate that the carrying amount of an asset may not Income Taxes. The Company and its subsidiaries file consolidated tax returns. The Company accounts for income taxes in accordance with FASB ASC 740, two not. not fifty Stock-Based Compensation. The Company applies FASB ASC 718 no Other. Securities and other property held by the Bank in a fiduciary or agency capacity are not not Recently Adopted Accounting Standards In the year ended December 31, 2021, FASB ASU 2019 12 Income Taxes (Topic 740 December 2019. 740 December 15, 2020, January 1, 2021 not In the year ended December 31, 2023, FASB ASU 2022 02 Credit Losses (Topic 326 March 2022, January 1, 2023 January 1, 2023. not Recently Issued Accounting Standards FASB ASU 2020 04 Reference Rate Reform (Topic 848 March 2020. no not 2020 04 December 2022, 2022 06, Reference Rate Reform (Topic 848 848. 2022 06 2020 04 December 2024. not FASB ASU 2022 03 Fair Value Measurement (Topic 820 June 2022. 820 1 2 3 December 15, 2023, FASB ASU 2023 02 Investments Equity Method and Joint Ventures (Topic 323 March 2023. December 15, 2023,

Note 2 - Investment Securities

Note 2 - Investment Securities	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	Note 2: An analysis of the amortized cost and fair value by major categories of debt securities available for sale, which are carried at fair value with net unrealized gains (losses) reported on an after-tax basis as a component of accumulated other comprehensive income, and debt securities held to maturity, which are carried at amortized cost, before allowance for credit losses of $1 thousand at December 31, 2023 December 31, 2022, not At December 31, 2023 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) Debt securities available for sale: Agency residential mortgage-backed securities ("MBS") $ 258,150 $ 6 $ (18,702 ) $ 239,454 Securities of U.S. Government sponsored entities 308,768 2 (13,851 ) 294,919 Obligations of states and political subdivisions 72,679 42 (1,438 ) 71,283 Corporate securities 2,129,103 480 (220,035 ) 1,909,548 Collateralized loan obligations 1,501,248 830 (17,481 ) 1,484,597 Total debt securities available for sale 4,269,948 1,360 (271,507 ) 3,999,801 Debt securities held to maturity: Agency residential MBS 78,565 17 (5,270 ) 73,312 Obligations of states and political subdivisions 71,182 47 (335 ) 70,894 Corporate securities 728,650 84 (23,378 ) 705,356 Total debt securities held to maturity 878,397 148 (28,983 ) 849,562 Total $ 5,148,345 $ 1,508 $ (300,490 ) $ 4,849,363 At December 31, 2022 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) Debt securities available for sale: Agency residential MBS $ 311,089 $ 4 $ (25,045 ) $ 286,048 Securities of U.S. Government sponsored entities 306,336 3 (15,486 ) 290,853 Obligations of states and political subdivisions 84,024 59 (2,079 ) 82,004 Corporate securities 2,406,566 1,032 (307,643 ) 2,099,955 Collateralized loan obligations 1,587,326 527 (14,970 ) 1,572,883 Total debt securities available for sale 4,695,341 1,625 (365,223 ) 4,331,743 Debt securities held to maturity: Agency residential MBS 104,852 13 (7,503 ) 97,362 Obligations of states and political subdivisions 89,208 73 (538 ) 88,743 Corporate securities 721,854 - (34,448 ) 687,406 Total debt securities held to maturity 915,914 86 (42,489 ) 873,511 Total $ 5,611,255 $ 1,711 $ (407,712 ) $ 5,205,254 The amortized cost and fair value of debt securities by contractual maturity are shown in the following table s at the dates indicated: At December 31, 2023 Debt Securities Available Debt Securities Held for Sale to Maturity Amortized Fair Amortized Fair Cost Value Cost Value (In thousands) Maturity in years: 1 year or less $ 52,703 $ 52,357 $ 15,117 $ 15,095 Over 1 to 5 years 756,658 721,179 312,847 307,557 Over 5 to 10 years 1,701,189 1,502,214 471,868 453,598 Subtotal 2,510,550 2,275,750 799,832 776,250 Collateralized loan obligations 1,501,248 1,484,597 - - Agency residential MBS 258,150 239,454 78,565 73,312 Total $ 4,269,948 $ 3,999,801 $ 878,397 $ 849,562 At December 31, 2022 Debt Securities Available Debt Securities Held for Sale to Maturity Amortized Fair Amortized Fair Cost Value Cost Value (In thousands) Maturity in years: 1 year or less $ 251,578 $ 250,317 $ 12,676 $ 12,659 Over 1 to 5 years 578,886 548,787 161,653 158,409 Over 5 to 10 years 1,966,462 1,673,708 636,733 605,081 Subtotal 2,796,926 2,472,812 811,062 776,149 Collateralized loan obligations 1,587,326 1,572,883 - - Agency residential MBS 311,089 286,048 104,852 97,362 Total $ 4,695,341 $ 4,331,743 $ 915,914 $ 873,511 Expected maturities of mortgage-related securities can differ from contractual maturities because borrowers have the right to call or prepay obligations with or without call or prepayment penalties. In addition, such factors as prepayments and interest rates may An analysis of the gross unrealized losses of the debt securities available for sale portfolio follows: Debt Securities Available for Sale At December 31, 2023 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 1 $ 115 $ (2 ) 107 $ 238,642 $ (18,700 ) 108 $ 238,757 $ (18,702 ) Securities of U.S. Government sponsored entities 2 9,746 (15 ) 19 278,265 (13,836 ) 21 288,011 (13,851 ) Obligations of states and political subdivisions 2 2,280 (15 ) 50 57,614 (1,423 ) 52 59,894 (1,438 ) Corporate securities - - - 151 1,894,602 (220,035 ) 151 1,894,602 (220,035 ) Collateralized loan obligations 34 428,363 (8,914 ) 67 578,643 (8,567 ) 101 1,007,006 (17,481 ) Total 39 $ 440,504 $ (8,946 ) 394 $ 3,047,766 $ (262,561 ) 433 $ 3,488,270 $ (271,507 ) An analysis of gross unrecognized losses of the debt securities held to maturity portfolio follows: Debt Securities Held to Maturity At December 31, 2023 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 1 $ - $ - 93 $ 72,376 $ (5,270 ) 94 $ 72,376 $ (5,270 ) Obligations of states and political subdivisions 23 18,599 (90 ) 26 25,466 (245 ) 49 44,065 (335 ) Corporate securities 3 26,567 (1,184 ) 46 641,598 (22,194 ) 49 668,165 (23,378 ) Total 27 $ 45,166 $ (1,274 ) 165 $ 739,440 $ (27,709 ) 192 $ 784,606 $ (28,983 ) Based upon the Company’s December 31, 2023 December 31, 2023. The Company does not not not The Company evaluates held to maturity corporate securities individually, monitoring each issuer’s financial condition, profitability, cash flows and credit rating agency conclusions. The Company has evaluated each issuer’s historical financial performance and ability to service debt payments throughout and following the 2008 2009 The fair values of debt securities could decline in the future if interest rates increase, the general economy deteriorates, inflation increases, credit ratings decline, the issuers’ financial condition deteriorates, or the liquidity for debt securities declines. As a result, significant credit losses on debt securities may As of December 31, 2023 December 31, 2022, An analysis of the gross unrealized losses of the debt securities available for sale portfolio follows: Debt Securities Available for Sale At December 31, 2022 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 107 $ 279,139 $ (24,222 ) 9 $ 6,110 $ (823 ) 116 $ 285,249 $ (25,045 ) Securities of U.S. Government sponsored entities 22 289,067 (15,486 ) - - - 22 289,067 (15,486 ) Obligations of states and political subdivisions 56 65,633 (1,902 ) 8 3,265 (177 ) 64 68,898 (2,079 ) Corporate securities 133 1,521,294 (170,453 ) 56 555,727 (137,190 ) 189 2,077,021 (307,643 ) Collateralized loan obligations 58 518,074 (13,772 ) 20 192,692 (1,198 ) 78 710,766 (14,970 ) Total 376 $ 2,673,207 $ (225,835 ) 93 $ 757,794 $ (139,388 ) 469 $ 3,431,001 $ (365,223 ) An analysis of gross unrecognized losses of the debt securities held to maturity portfolio follows: Debt Securities Held to Maturity At December 31, 2022 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 97 $ 95,814 $ (7,404 ) 2 $ 682 $ (99 ) 99 $ 96,496 $ (7,503 ) Obligations of states and political subdivisions 54 53,536 (538 ) - - - 54 53,536 (538 ) Corporate securities 49 672,406 (34,448 ) - - - 49 672,406 (34,448 ) Total 200 $ 821,756 $ (42,390 ) 2 $ 682 $ (99 ) 202 $ 822,438 $ (42,489 ) The Company evaluates debt securities on a quarterly basis including changes in security ratings issued by rating agencies, changes in the financial condition of the issuer, and, for mortgage-backed and asset-backed securities, collateral levels, delinquency and loss information with respect to the underlying collateral, changes in the levels of subordination for the Company’s particular position within the repayment structure and remaining credit enhancement as compared to expected credit losses of the security. In addition to monitoring credit rating agency evaluations, Management performs its own evaluations regarding the credit worthiness of the issuer or the securitized assets underlying asset backed securities. The following table presents the activity in the allowance for credit losses for debt securities held to maturity: For the Years Ended December 31, 2023 2022 2021 (In thousands) Allowance for credit losses: Beginning balance $ 1 $ 7 $ 9 Reversal of provision for credit losses - (6 ) (2 ) Chargeoffs - - - Recoveries - - - Total ending balance $ 1 $ 1 $ 7 Agency mortgage-backed securities were assigned no December 31, 2023, no The following table summarizes the amortized cost of debt securities held to maturity at December 31, 2023, Credit Risk Profile by Credit Rating At December 31, 2023 AAA/AA/A BBB+ Not Rated Total (In thousands) Agency residential MBS $ 78,092 $ - $ 473 $ 78,565 Obligations of states and political subdivisions 71,002 - 180 71,182 Corporate securities 506,508 222,142 - 728,650 Total $ 655,602 $ 222,142 $ 653 $ 878,397 There were no 30 December 31, 2023. The following table provides information about the amount of interest income earned on investment securities which is fully taxable and which is exempt from federal income tax: For the Years Ended December 31, 2023 2022 2021 (In thousands) Taxable $ 221,742 $ 158,465 $ 106,329 Tax-exempt from regular federal income tax 4,484 5,819 8,424 Total interest income from investment securities $ 226,226 $ 164,284 $ 114,753

Note 3 - Loans and Allowance fo

Note 3 - Loans and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]	Note 3: A summary of the major categories of loans outstanding is shown in the following tables at the dates indicated: At December 31, At December 31, 2023 2022 (In thousands) Commercial $ 136,550 $ 169,617 Commercial real estate 487,523 491,107 Construction 5,063 3,088 Residential real estate 9,935 13,834 Consumer installment & other 227,531 280,842 Total $ 866,602 $ 958,488 The following summarizes activity in the allowance for credit losses: Allowance for Credit Losses For the Year Ended December 31, 2023 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 6,138 $ 5,888 $ 150 $ 32 $ 8,076 $ 20,284 (Reversal) provision (3,871 ) 11 95 (6 ) 2,621 (1,150 ) Chargeoffs (410 ) (45 ) - - (7,499 ) (7,954 ) Recoveries 2,359 71 - - 3,257 5,687 Total allowance for credit losses $ 4,216 $ 5,925 $ 245 $ 26 $ 6,455 $ 16,867 [The remainder of this page intentionally left blank] Allowance for Credit Losses For the Year Ended December 31, 2022 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 6,966 $ 6,529 $ 2 $ 45 $ 9,972 $ 23,514 (Reversal) provision (1,184 ) (703 ) 148 (13 ) 1,758 6 Chargeoffs (20 ) - - - (6,205 ) (6,225 ) Recoveries 376 62 - - 2,551 2,989 Total allowance for credit losses $ 6,138 $ 5,888 $ 150 $ 32 $ 8,076 $ 20,284 Allowance for Credit Losses For the Year Ended December 31, 2021 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 9,205 $ 5,660 $ 6 $ 47 $ 8,936 $ 23,854 (Reversal) provision (2,411 ) 126 (4 ) (2 ) 2,293 2 Chargeoffs (56 ) - - - (3,192 ) (3,248 ) Recoveries 228 743 - - 1,935 2,906 Total allowance for credit losses $ 6,966 $ 6,529 $ 2 $ 45 $ 9,972 $ 23,514 The Company’s customers are primarily small businesses, professionals and consumers. Given the scale of these borrowers, corporate credit rating agencies do not The following summarizes the credit risk profile by internally assigned grade: Credit Risk Profile by Internally Assigned Grade At December 31, 2023 Commercial Commercial Real Estate Construction Residential Real Estate Consumer Installment and Other Total (In thousands) Grade: Pass $ 130,001 $ 475,870 $ 5,063 $ 9,606 $ 225,089 $ 845,629 Substandard 6,549 11,653 - 329 377 18,908 Doubtful - - - - 1,479 1,479 Loss - - - - 586 586 Total $ 136,550 $ 487,523 $ 5,063 $ 9,935 $ 227,531 $ 866,602 Credit Risk Profile by Internally Assigned Grade At December 31, 2022 Commercial Commercial Real Estate Construction Residential Real Estate Consumer Installment and Other Total (In thousands) Grade: Pass $ 169,040 $ 477,842 $ 3,088 $ 13,457 $ 278,223 $ 941,650 Substandard 577 13,265 - 377 1,079 15,298 Doubtful - - - - 752 752 Loss - - - - 788 788 Total $ 169,617 $ 491,107 $ 3,088 $ 13,834 $ 280,842 $ 958,488 The following tables summarize loans by delinquency and nonaccrual status: Summary of Loans by Delinquency and Nonaccrual Status At December 31, 2023 Current and Accruing 30-59 Days Past Due and Accruing 60-89 Days Past Due and Accruing Past Due 90 Days or More and Accruing Nonaccrual Total Loans (In thousands) Commercial $ 136,421 $ 58 $ - $ - $ 71 $ 136,550 Commercial real estate 485,476 951 766 - 330 487,523 Construction 5,063 - - - - 5,063 Residential real estate 9,933 - - - 2 9,935 Consumer installment and other 220,357 5,544 1,242 388 - 227,531 Total $ 857,250 $ 6,553 $ 2,008 $ 388 $ 403 $ 866,602 Summary of Loans by Delinquency and Nonaccrual Status At December 31, 2022 Current and Accruing 30-59 Days Past Due and Accruing 60-89 Days Past Due and Accruing Past Due 90 Days or More and Accruing Nonaccrual Total Loans (In thousands) Commercial $ 169,337 $ 172 $ 58 $ - $ 50 $ 169,617 Commercial real estate 490,354 508 192 - 53 491,107 Construction 3,088 - - - - 3,088 Residential real estate 13,430 377 - - 27 13,834 Consumer installment and other 273,247 5,101 1,850 628 16 280,842 Total $ 949,456 $ 6,158 $ 2,100 $ 628 $ 146 $ 958,488 There was no December 31, 2023 December 31, 2022. December 31, 2023 December 31, 2022. There were no loan modifications made to borrowers experiencing financial difficulty during the year ended December 31, 2023 December 31, 2022. A loan is considered collateral dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. Loans that were considered collateral dependent at December 31, 2023 nine no December 31, 2023. December 31, 2022 five no December 31, 2022. Based on the most recent analysis performed, the risk category of loans by class of loans is as follows: At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Commercial loans by grade: Pass $ 20,554 $ 4,471 $ 12,601 $ 31,770 $ 22,146 $ 13,112 $ 104,654 $ 25,347 $ 130,001 Substandard 12 2,492 - 2,835 - - 5,339 1,210 6,549 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 20,566 $ 6,963 $ 12,601 $ 34,605 $ 22,146 $ 13,112 $ 109,993 $ 26,557 $ 136,550 Current gross chargeoffs on commercial loans: For the year ended December 31, 2023 $ - $ - $ 3 $ 135 $ - $ - $ 138 $ 272 $ 410 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Commercial loans by grade: Pass $ 23,891 $ 5,549 $ 12,557 $ 17,293 $ 53,928 $ 23,966 $ 137,184 $ 31,856 $ 169,040 Substandard 12 - - - - - 12 565 577 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 23,903 $ 5,549 $ 12,557 $ 17,293 $ 53,928 $ 23,966 $ 137,196 $ 32,421 $ 169,617 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Commercial real estate loans by grade: Pass $ 172,925 $ 68,156 $ 69,324 $ 68,891 $ 50,899 $ 45,675 $ 475,870 $ - $ 475,870 Substandard 10,056 811 786 - - - 11,653 - 11,653 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 182,981 $ 68,967 $ 70,110 $ 68,891 $ 50,899 $ 45,675 $ 487,523 $ - $ 487,523 Current gross chargeoffs on commercial real estate loans: For the year ended December 31, 2023 $ 45 $ - $ - $ - $ - $ - $ 45 $ - $ 45 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Commercial real estate loans by grade: Pass $ 146,588 $ 58,473 $ 71,440 $ 74,016 $ 71,618 $ 55,707 $ 477,842 $ - $ 477,842 Substandard 8,083 - 2,112 806 - 2,264 13,265 - 13,265 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 154,671 $ 58,473 $ 73,552 $ 74,822 $ 71,618 $ 57,971 $ 491,107 $ - $ 491,107 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Residential real estate loans by grade: Pass $ 9,606 $ - $ - $ - $ - $ - $ 9,606 $ - $ 9,606 Substandard 329 - - - - - 329 - 329 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 9,935 $ - $ - $ - $ - $ - $ 9,935 $ - $ 9,935 Current gross chargeoffs on residential real estate loans: For the year ended December 31, 2023 $ - $ - $ - $ - $ - $ - $ - $ - $ - At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Residential real estate loans by grade: Pass $ 13,457 $ - $ - $ - $ - $ - $ 13,457 $ - $ 13,457 Substandard 377 - - - - - 377 - 377 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 13,834 $ - $ - $ - $ - $ - $ 13,834 $ - $ 13,834 [The remainder of this page intentionally left blank] At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Construction loans by grade: Pass $ - $ - $ - $ - $ - $ - $ - $ 5,063 $ 5,063 Substandard - - - - - - - - - Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ - $ - $ - $ - $ - $ - $ - $ 5,063 $ 5,063 Current gross chargeoffs on construction loans: For the year ended December 31, 2023 $ - $ - $ - $ - $ - $ - $ - $ - $ - At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Construction loans by grade: Pass $ - $ - $ - $ - $ - $ - $ - $ 3,088 $ 3,088 Substandard - - - - - - - - - Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ - $ - $ - $ - $ - $ - $ - $ 3,088 $ 3,088 The Company considers the delinquency and nonaccrual status of the consumer loan portfolio and its impact on the allowance for credit losses. The following table presents the amortized cost in consumer installment and other loans based on delinquency and nonaccrual status: At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Consumer installment and other loans by delinquency and nonaccrual status: Current $ 6,545 $ 12,144 $ 22,700 $ 51,055 $ 71,388 $ 38,699 $ 202,531 $ 17,826 $ 220,357 30-59 days past due 160 277 600 2,345 1,733 332 5,447 97 5,544 60-89 days past due 31 51 153 410 430 122 1,197 45 1,242 Past due 90 days or more - 8 88 143 138 - 377 11 388 Nonaccrual - - - - - - - - - Total $ 6,736 $ 12,480 $ 23,541 $ 53,953 $ 73,689 $ 39,153 $ 209,552 $ 17,979 $ 227,531 Current gross chargeoffs on consumer installment and other loans: For the year ended December 31, 2023 $ 246 $ 161 $ 843 $ 2,329 $ 3,191 $ 453 $ 7,223 $ 276 $ 7,499 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Consumer installment and other loans by delinquency and nonaccrual status: Current $ 6,017 $ 13,147 $ 22,330 $ 35,783 $ 76,126 $ 99,414 $ 252,817 $ 20,430 $ 273,247 30-59 days past due 117 268 572 1,014 1,709 1,359 5,039 62 5,101 60-89 days past due 42 65 67 275 635 750 1,834 16 1,850 Past due 90 days or more 3 20 16 61 284 241 625 3 628 Nonaccrual - - - - - - - 16 16 Total $ 6,179 $ 13,500 $ 22,985 $ 37,133 $ 78,754 $ 101,764 $ 260,315 $ 20,527 $ 280,842 There were no loans held for sale at December 31, 2023 December 31, 2022. The Company held no other real estate owned (OREO) at December 31, 2023 December 31, 2022. December 31, 2023 December 31, 2022, [The remainder of this page intentionally left blank]

Note 4 - Concentration of Credi

Note 4 - Concentration of Credit Risk	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Concentration Risk Disclosure [Text Block]	Note 4: Under the California Financial Code, credit extended to any one one not not not December 31, 2023, not one December 31, 2023, 3, December 31, 2023 December 31, 2022, no no December 31, 2023,

Note 5 - Premises, Equipment, O

Note 5 - Premises, Equipment, Other Assets and Other Liabilities	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Other Assets and Liabilities Disclosure [Text Block]	Note 5: Premises and equipment consisted of the following: At December 31, Cost Accumulated Depreciation and Amortization Net Book Value (In thousands) 2023 Land $ 11,453 $ - $ 11,453 Building and improvements 43,185 (31,742 ) 11,443 Leasehold improvements 7,622 (6,550 ) 1,072 Furniture and equipment 26,586 (23,538 ) 3,048 Total $ 88,846 $ (61,830 ) $ 27,016 2022 Land $ 11,453 $ - $ 11,453 Building and improvements 42,528 (30,601 ) 11,927 Leasehold improvements 8,157 (6,897 ) 1,260 Furniture and equipment 26,766 (22,587 ) 4,179 Total $ 88,904 $ (60,085 ) $ 28,819 Depreciation and amortization of premises and equipment included in noninterest expense amounted to $2,942 thousand in 2023, 2022, 2021. [The remainder of this page intentionally left blank] Other assets consisted of the following: At December 31, At December 31, 2023 2022 (In thousands) Cost method equity investments: Federal Reserve Bank stock (1) $ 14,069 $ 11,743 Other investments 158 158 Total cost method equity investments 14,227 11,901 Life insurance cash surrender value 66,611 63,816 Net deferred tax asset 99,507 125,140 Right-of-use asset 18,814 15,746 Limited partnership investments 28,667 34,421 Interest receivable 54,568 53,558 Prepaid assets 5,200 4,894 Other assets 9,716 9,670 Total other assets $ 297,310 $ 319,146 ( 1 six The Company owns 211 thousand shares of Visa Inc. (“Visa”) class B common stock which have transfer restrictions; the carrying value is $-0- thousand. Visa Inc. disclosed a revised conversion rate applicable to its class B common stock in its Form 8 October 2, 2023. September 28, 2023. December 29, 2023, fourth 2023. January 23, 2024, one 1 1 1 1 The Company invests in flow-through limited liability entities that manage or invest in affordable housing projects that qualify for low-income housing tax credits. At December 31, 2023, December 31, 2022, December 31, 2023, 2024, 2025, 2026, 2027, 2028 The amounts recognized in net income for these investments include: For the Years Ended December 31, 2023 2022 2021 (In thousands) Investment loss included in pre-tax income $ 5,754 $ 5,724 $ 2,620 Tax credits recognized in provision for income taxes 3,435 3,250 2,300 [The remainder of this page intentionally left blank] Other liabilities consisted of the following: At December 31, At December 31, 2023 2022 (In thousands) Operating lease liability $ 18,814 $ 15,746 Other liabilities 40,455 49,379 Total other liabilities $ 59,269 $ 65,125 The Company has entered into leases for most branch locations and certain other offices that were classified as operating leases primarily with original terms of five one five not not not December 31, 2023. As of December 31, 2023, December 31, 2023. not December 31, 2023. Total lease costs of $6,604 thousand, $6,575 thousand and $6,581 thousand, during the year ended December 31, 2023, 2022 2021, not December 31, 2023, 2022 2021. The following table summarizes the remaining lease payments of operating lease liabilities: Minimum At December 31, 2023 (In thousands) 2024 $ 6,067 2025 5,178 2026 3,518 2027 2,621 2028 1,865 Thereafter 818 Total minimum lease payments 20,067 Less: discount (1,253 ) Present value of lease liability $ 18,814 See Note 10

Note 6 - Goodwill and Identifia

Note 6 - Goodwill and Identifiable Intangible Assets	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Goodwill and Intangible Assets Disclosure [Text Block]	Note 6: The Company has recorded goodwill and other identifiable intangibles associated with purchase business combinations. Goodwill is not not December 31, 2023 December 31, 2022, no December 31, 2023 December 31, 2022, [The remainder of this page intentionally left blank] The carrying values of goodwill were: At December 31, 2023 At December 31, 2022 (In thousands) Goodwill $ 121,673 $ 121,673 The gross carrying amount of identifiable intangible assets and accumulated amortization were: At December 31, 2023 At December 31, 2022 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization (In thousands) Core deposit intangibles $ 56,808 $ (56,461 ) $ 56,808 $ (56,225 ) As of December 31, 2023, 2025, Total Core Deposit Intangibles (In thousands) For the year ended December 31, 2023 (actual) $ 236 2024 222 2025 125

Note 7 - Deposits and Borrowed

Note 7 - Deposits and Borrowed Funds	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Deposits and Borrowed Funds [Text Block]	Note 7: The following table provides additional detail regarding deposits. Deposits At December 31, At December 31, 2023 2022 (In thousands) Noninterest-bearing $ 2,605,844 $ 2,947,277 Interest-bearing: Transaction 1,072,233 1,273,143 Savings 1,699,388 1,874,115 Time deposits less than $100 thousand 56,100 65,962 Time deposits $100 thousand through $250 thousand 31,107 42,733 Time deposits more than $250 thousand 9,595 22,060 Total deposits $ 5,474,267 $ 6,225,290 Demand deposit overdrafts of $620 thousand and $995thousand were included as loan balances at December 31, 2023 December 31, 2022, $100 2023, 2022, 2021. [The remainder of this page intentionally left blank] The following table provides additional detail regarding short-term borrowed funds. Repurchase Agreements (Sweep) Remaining Contractual Maturity of the Agreements Overnight and Continuous At December 31, At December 31, 2023 2022 Repurchase agreements: (In thousands) Collateral securing borrowings: Agency residential MBS $ 25,669 $ 30,108 Corporate securities 233,947 203,774 Total collateral carrying value $ 259,616 $ 233,882 Total short-term borrowed funds $ 58,162 $ 57,792 The following table provides additional detail regarding short-term borrowed funds. For the Years Ended December 31, 2023 2022 Highest Balance at Any Month-end (In thousands) Securities sold under repurchase agreements $ 138,005 $ 257,560 At December 31, 2023, December 31, 2023. December 31, 2023. December 31, 2023, December 31, 2023,

Note 8 - Shareholders' Equity

Note 8 - Shareholders' Equity	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Equity [Text Block]	Note 8: Equity The Company grants stock options and restricted performance shares to employees in exchange for employee services, pursuant to the shareholder-approved 2019 2019 April 25, 2019, 1995 2012. three ten three three [The remainder of this page intentionally left blank] The following table summarizes information about stock options granted under the Plans as of December 31, 2023. December 31, 2023 December 29, 2023, fourth 2023, Options Outstanding Options Exercisable At December 31, 2023 For the Year Ended December 31, 2023 At December 31, 2023 For the Year Ended December 31, 2023 Range of Exercise Price Number Outstanding Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Weighted Average Exercise Price Number Exercisable Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Weighted Average Exercise Price (In thousands) (Years) (In thousands) (Years) $ 40 - 45 12 $ 149 1.9 $ 42 12 $ 149 1.9 $ 42 45 - 50 - - - - - - - - 50 - 55 4 8 0.1 53 4 8 0.1 53 55 - 60 572 - 7.6 57 213 - 6.1 58 60 - 65 247 - 4.6 62 247 - 4.6 62 65 - 70 138 - 6.1 66 138 - 6.1 66 $ 40 - 70 973 $ 157 6.5 60 614 $ 157 5.4 61 The Company applies the Roll-Geske option pricing model (Modified Roll) to determine grant date fair value of stock option grants. This model modifies the Black-Scholes Model to take into account dividends and American options. During the year ended December 31, 2023, 2022 2021, For the Years Ended December 31, 2023 2022 2021 Expected volatility (1) 20 % 19 % 20 % Expected life in years (2) 4.7 4.6 4.7 Risk-free interest rate (3) 3.60 % 1.73 % 0.46 % Expected dividend yield 3.66 % 3.02 % 2.79 % Fair value per award $ 8.50 $ 7.90 $ 7.50 ( 1 ( 2 ( 3 Employee stock option grants are being expensed by the Company over the grants’ three December 31, 2023 [The remainder of this page intentionally left blank] A summary of option activity during the year ended December 31, 2023 Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (In thousands) (Years) Outstanding at January 1, 2023 854 $ 60.02 Granted 225 55.47 Exercised (22 ) 43.30 Forfeited or expired (84 ) 55.26 Outstanding at December 31, 2023 973 59.50 6.5 Exercisable at December 31, 2023 614 61.17 5.4 A summary of the Company’s nonvested option activity during the year ended December 31, 2023 Shares Weighted Average Grant Date Fair Value (In thousands) Nonvested at January 1, 2023 346 $ 7.88 Granted 225 8.50 Vested (164 ) 7.99 Forfeited (48 ) 8.18 Nonvested at December 31, 2023 359 $ 8.18 The estimated grant date fair value for options granted under the Company’s stock option plan during the twelve December 31, 2023, 2022 2021 December 31, 2023 The total intrinsic value of options exercised during the year ended December 31, 2023, 2022 2021 December 31, 2023, 2022 2021 December 31, 2023, 2022 2021 December 31, 2023, December 31, 2022, 2022 December 31, 2021, 2023. A summary of the status of the Company’s restricted performance shares as of December 31, 2023 2022 2023 2022 (In thousands) Outstanding at January 1, 31 30 Granted 12 12 Issued upon vesting (9 ) (8 ) Forfeited (2 ) (3 ) Outstanding at December 31, 32 31 As of December 31, 2023 2022, December 31, 2023, 2022 2021, December 31, 2023, 2022 2021. The Company repurchases shares of its common stock in the open market to optimize the Company’s use of equity capital and enhance shareholder value and with the intention of lessening the dilutive impact of issuing new shares under stock option plans, and other ongoing requirements. The Company repurchases and retires its common stock in accordance with Board of Directors approved share repurchase programs. The repurchase plan approved July 28, 2022 September 1, 2023. The Company’s articles of incorporation authorized two additional classes of stock of one million December 31, 2023,

Note 9 - Regulatory Capital

Note 9 - Regulatory Capital	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Regulatory Capital Requirements under Banking Regulations [Text Block]	Note 9: Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off-balance-sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can result in regulatory action. The Basel Committee on Banking Supervision’s capital guidelines for U.S. banks (Basel III rules) require the Company to maintain a capital conservation buffer of 2.5% above the adequately capitalized risk-based capital ratios to avoid restrictions on dividends and equity repurchases and other payments such as discretionary bonuses to executive officers. The net unrealized gain or loss on available for sale securities is not December 31, 2023 December 31, 2022, Prompt corrective action regulations provide five not 2023 2022, no December 31, 2023. The capital ratios for the Company and the Bank as of the dates indicated are presented in the table below. For Common Equity Tier 1 1 2.5% At December 31, 2023 Required To Be Well-capitalized Amount Ratio Amount Ratio Amount Ratio ($ in thousands) Common Equity Tier 1 Capital Company $ 841,611 18.76 % $ 313,959 7.00 % N/A N/A Bank 641,252 14.46 % 310,362 7.00 % $ 288,193 6.50 % Tier 1 Capital Company 841,611 18.76 % 381,236 8.50 % N/A N/A Bank 641,252 14.46 % 376,868 8.50 % 354,700 8.00 % Total Capital Company 858,680 19.15 % 470,939 10.50 % N/A N/A Bank 664,321 14.98 % 465,543 10.50 % 443,375 10.00 % Leverage Ratio (1) Company 841,611 12.86 % 261,739 4.00 % N/A N/A Bank 641,252 9.88 % 259,617 4.00 % 324,521 5.00 % ( 1 1capital [The remainder of this page intentionally left blank] At December 31, 2022 Required To Be Well-capitalized Amount Ratio Amount Ratio Amount Ratio ($ in thousands) Common Equity Tier 1 Capital Company $ 736,414 15.22 % $ 338,748 7.00 % N/A N/A Bank 592,804 12.37 % 335,351 7.00 % $ 311,397 6.50 % Tier 1 Capital Company 736,414 15.22 % 411,337 8.50 % N/A N/A Bank 592,804 12.37 % 407,212 8.50 % 383,258 8.00 % Total Capital Company 756,900 15.64 % 508,123 10.50 % N/A N/A Bank 619,290 12.93 % 503,026 10.50 % 479,073 10.00 % Leverage Ratio (1) Company 736,414 10.18 % 289,259 4.00 % N/A N/A Bank 592,804 8.26 % 287,229 4.00 % 359,036 5.00 % ( 1 1capital

Note 10 - Income Taxes

Note 10 - Income Taxes	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Income Tax Disclosure [Text Block]	Note 10: Deferred tax assets and liabilities are recognized for future tax consequences attributable to differences between the amounts reported in the financial statements of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Amounts for the current year are based upon estimates and assumptions as of the date of these financial statements and could vary significantly from amounts shown on the tax returns as filed. Net deferred tax assets are included with other assets in the consolidated balance sheets. The components of the net deferred tax asset is as follows: At December 31, 2023 2022 (In thousands) Deferred tax asset Allowance for credit losses $ 4,853 $ 5,858 Securities available for sale 79,865 107,493 State franchise taxes 4,816 3,805 Deferred compensation 3,828 4,091 Purchased assets and assumed liabilities 321 229 Post-retirement benefits 367 405 Employee benefit accruals 3,454 3,096 VISA Class B shares 343 507 Accrued liabilities 1,172 840 Premises and equipment 1,175 1,193 Lease liability 5,413 4,548 Other 69 99 Total deferred tax asset 105,676 132,164 Deferred tax liability Net deferred loan costs - 193 Right-of-use asset 5,413 4,548 Intangible assets 451 453 Limited partnership investments 305 1,830 Total deferred tax liability 6,169 7,024 Net deferred tax asset $ 99,507 $ 125,140 Based on Management’s judgment, a valuation allowance is not not The provision for federal and state income taxes consists of amounts currently payable and amounts deferred as follows: For the Years Ended December 31, 2023 2022 2021 (In thousands) Current income tax expense: Federal $ 38,075 $ 26,785 $ 15,299 State 23,731 16,075 11,320 Total current 61,806 42,860 26,619 Deferred income tax (benefit) expense: Federal (1,197 ) (1,349 ) 1,281 State (798 ) 2,046 842 Total deferred (1,995 ) 697 2,123 Provision for income taxes Federal - - (472 ) State - - 2,248 Total change in valuation reserve - - 1,776 Provision for income taxes $ 59,811 $ 43,557 $ 30,518 The provision for income taxes differs from the provision computed by applying the statutory federal income tax rate to income before taxes, as follows: For the Years Ended December 31, 2023 2022 2021 (In thousands) Federal income taxes due at statutory rate $ 46,532 $ 34,774 $ 24,576 (Reductions) additions in income taxes resulting from: Interest on state and municipal securities and loans not taxable for federal income tax purposes (1,188 ) (1,484 ) (2,070 ) State franchise taxes, net of federal income tax benefit 18,117 14,315 9,757 Change in valuation reserve - - 1,776 Stock compensation deduction less than (in excess of) book expense 3 30 - Tax credits (2,943 ) (3,439 ) (2,621 ) Dividend received deduction (66 ) (56 ) (48 ) Cash value life insurance (597 ) (421 ) (389 ) Other (47 ) (162 ) (463 ) Provision for income taxes $ 59,811 $ 43,557 $ 30,518 At December 31, 2023 December 31, 2022, The Company classifies interest and penalties as a component of the provision for income taxes. For tax years 2023 2022, December 31, 2023, December 31, 2022, 2021 2020 December 31, 2022, 2021, 2020 2019

Note 11 - Fair Value Measuremen

Note 11 - Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Fair Value Disclosures [Text Block]	Note 11: The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Debt securities available for sale are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may In accordance with the Fair Value Measurement and Disclosure topic of the FASB Accounting Standards Codification, the Company bases its fair values on the price that would be received to sell an asset or paid to transfer a liability in the principal market or most advantageous market for an asset or liability in an orderly transaction between market participants on the measurement date under current market conditions. A fair value measurement reflects all of the assumptions that market participants would use in pricing the asset or liability, including assumptions about the risk inherent in a particular valuation technique, the effect of a restriction on the sale or use of an asset, and the risk of nonperformance. The Company groups its assets and liabilities measured at fair value into a three Level 1 1 Level 2 not 2 Level 3 not The Company relies on independent vendor pricing services to measure fair value for equity securities, debt securities available for sale and debt securities held to maturity. The Company employs three may not The Company regularly reviews the valuation techniques and assumptions used by its vendors and determines which valuation techniques are utilized based on observable market inputs for the type of securities being measured. The Company uses the information to determine the placement in the fair value hierarchy as level 1, 2 3. Assets Recorded at Fair Value on a Recurring Basis The tables below present assets measured at fair value on a recurring basis on the dates indicated. At December 31, 2023 Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (1) (In thousands) Debt securities available for sale: Agency residential MBS $ 239,454 $ - $ 239,454 $ - Securities of U.S. Government sponsored entities 294,919 - 294,919 - Obligations of states and political subdivisions 71,283 - 71,283 - Corporate securities 1,909,548 - 1,909,548 - Collateralized loan obligations 1,484,597 - 1,484,597 - Total debt securities available for sale $ 3,999,801 $ - $ 3,999,801 $ - ( 1 no 3 December 31, 2023. At December 31, 2022 Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (1) (In thousands) Debt securities available for sale: Agency residential MBS $ 286,048 $ - $ 286,048 $ - Securities of U.S. Government sponsored entities 290,853 - 290,853 - Obligations of states and political subdivisions 82,004 - 82,004 - Corporate securities 2,099,955 - 2,099,955 - Collateralized loan obligations 1,572,883 - 1,572,883 - Total debt securities available for sale $ 4,331,743 $ - $ 4,331,743 $ - ( 1 no 3 December 31, 2022. Assets Recorded at Fair Value on a Nonrecurring Basis The Company may December 31, 2023 December 31, 2022, For the Year Ended At December 31, 2023 December 31, 2023 Carrying Value Level 1 Level 2 Level 3 Total Losses (In thousands) Loans: Commercial real estate $ 110 $ - $ - $ 110 $ - Total assets measured at fair value on a nonrecurring basis $ 110 $ - $ - $ 110 $ - For the Year Ended At December 31, 2022 December 31, 2022 Carrying Value Level 1 Level 2 Level 3 Total Losses (In thousands) Loans: Commercial real estate $ 225 $ - $ - $ 225 $ - Total assets measured at fair value on a nonrecurring basis $ 225 $ - $ - $ 225 $ - Level 3 third not not Disclosures about Fair Value of Financial Instruments The tables below are a summary of fair value estimates for financial instruments and the level of the fair value hierarchy within which the fair value measurements are categorized, excluding financial instruments recorded at fair value on a recurring basis. The values assigned do not may not may The Company has not not not not At December 31, 2023 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Financial Assets: (In thousands) Cash and due from banks $ 190,314 $ 190,314 $ 190,314 $ - $ - Debt securities held to maturity 878,396 849,562 - 849,562 - Loans 849,735 847,031 - - 847,031 Financial Liabilities: Deposits $ 5,474,267 $ 5,474,012 $ - $ 5,377,465 $ 96,547 Short-term borrowed funds 58,162 58,162 - 58,162 - At December 31, 2022 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Financial Assets: (In thousands) Cash and due from banks $ 294,236 $ 294,236 $ 294,236 $ - $ - Debt securities held to maturity 915,913 873,511 - 873,511 - Loans 938,204 905,720 - - 905,720 Financial Liabilities: Deposits $ 6,225,290 $ 6,224,791 $ - $ 6,094,535 $ 130,256 Short-term borrowed funds 57,792 57,792 - 57,792 - The majority of the Company’s standby letters of credit and other commitments to extend credit carry current market interest rates if converted to loans. No

Note 12 - Commitments and Conti

Note 12 - Commitments and Contingent Liabilities	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	Note 12: Loan commitments are agreements to lend to a customer provided there is no not December 31, 2023 December 31, 2022. not December 31, 2023 December 31, 2022. December 31, 2023 December 31, 2022. December 31, 2023 $95 December 31, 2022. third December 31, 2023 December 31, 2022. December 31, 2023, $29,958 not December 31, 2022. Due to the nature of its business, the Company is subject to various threatened or filed legal cases. Based on the advice of legal counsel, the Company does not

Note 13 - Retirement Benefit Pl

Note 13 - Retirement Benefit Plans	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Retirement Benefits [Text Block]	Note 13: The Company sponsors a qualified defined contribution Deferred Profit-Sharing Plan covering substantially all of its salaried employees with one 2023, 2022, 2021. The Company also sponsors a qualified defined contribution Tax Deferred Savings/Retirement Plan (ESOP) covering salaried employees who become eligible to participate upon completion of a 90 may one 2023, 2022, 2021. The Company offers a continuation of group insurance coverage to eligible employees electing early retirement, for the period from the date of retirement until age 65. 65 February 1, 2006 January 1, 2024. December 31 The following tables set forth the net periodic post-retirement benefit cost and the change in the benefit obligation for the year ended December 31 December 31: Net Periodic Benefit Cost At December 31, 2023 2022 2021 (In thousands) Service benefit $ (56 ) $ (19 ) $ (15 ) Interest cost 70 38 30 Net periodic cost $ 14 $ 19 $ 15 Obligation and Funded Status At December 31, 2023 2022 2021 Change in benefit obligation (In thousands) Benefit obligation at beginning of year $ 1,401 $ 1,527 $ 1,654 Service benefit (56 ) (19 ) (15 ) Interest cost 70 38 30 Benefits paid (139 ) (145 ) (142 ) Benefit obligation at end of year $ 1,276 $ 1,401 $ 1,527 Accumulated post-retirement benefit obligation attributable to: Retirees $ 1,276 $ 1,401 $ 1,527 Other - - - Total $ 1,276 $ 1,401 $ 1,527 Fair value of plan assets - - - Accumulated post-retirement benefit obligation in excess of plan assets $ 1,276 $ 1,401 $ 1,527 [The remainder of this page intentionally left blank] Additional Information Assumptions At December 31, 2023 2022 2021 Weighted-average assumptions used to determine benefit obligations Discount rate 4.75 % 5.01 % 2.46 % Weighted-average assumptions used to determine net periodic benefit cost Discount rate 5.01 % 2.46 % 1.80 % The above discount rate is based on the expected return of a portfolio of Corporate Aa debt, the term of which approximates the term of the benefit obligations. The Company reserves the right to terminate or alter post-employment health benefits. Post-retirement medical benefits are currently fixed amounts without provision for future increases; as a result, the assumed annual average rate of inflation used to measure the expected cost of benefits covered by this program is zero 2024 Estimated future benefit payments (In thousands) 2024 $ 133 2025 133 2026 133 2027 127 2028 118 Years 2029-2033 424

Note 14 - Related Party Transac

Note 14 - Related Party Transactions	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	Note 14: Certain of the Directors, executive officers and their associates have had banking transactions with subsidiaries of the Company in the ordinary course of business. The table below reflects information concerning loans to certain directors and executive officers and/or family members during 2023 2022: 2023 2022 ($ in thousands) Balance at January 1, $ 400 $ 454 Originations - - Principal reductions (51 ) (54 ) Balance at December 31, $ 349 $ 400 Percent of total loans outstanding. 0.04 % 0.04 %

Note 15 - Regulatory Matters

Note 15 - Regulatory Matters	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Regulatory Matters [Text Block]	Note 15: Payment of dividends to the Company by the Bank is limited under regulations for state chartered banks. The amount that can be paid in any calendar year, without prior approval from regulatory agencies, cannot exceed the net profits (as defined) for the preceding three 1972. [The remainder of this page intentionally left blank]

Note 16 - Other Comprehensive I

Note 16 - Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Comprehensive Income (Loss) Note [Text Block]	Note 16: The components of other comprehensive income (loss) and other related tax effects were: 2023 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized losses arising during the year $ 93,326 $ (27,591 ) $ 65,735 Reclassification of losses included in net income 125 (37 ) 88 Other comprehensive income $ 93,451 $ (27,628 ) $ 65,823 2022 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized losses/gains arising during the year $ (434,107 ) $ 128,338 $ (305,769 ) Other comprehensive loss $ (434,107 ) $ 128,338 $ (305,769 ) 2021 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized gains arising during the year $ (91,891 ) $ 27,167 $ (64,724 ) Reclassification of gains included in net income (34 ) 10 (24 ) Other comprehensive loss $ (91,925 ) $ 27,177 $ (64,748 ) Accumulated other comprehensive income (loss) balances were: Accumulated Other Comprehensive Income (Loss) (In thousands) Balance, December 31, 2020 $ 114,412 Changes in unrealized gains on debt securities available for sale, net of tax (64,748 ) Balance, December 31, 2021 49,664 Changes in unrealized losses/gains on debt securities available for sale, net of tax (305,769 ) Balance, December 31, 2022 (256,105 ) Changes in unrealized losses on debt securities available for sale, net of tax 65,823 Balance, December 31, 2023 $ (190,282 ) [The remainder of this page intentionally left blank]

Note 17 - Earnings Per Common S

Note 17 - Earnings Per Common Share	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Earnings Per Share [Text Block]	Note 17: The table below shows earnings per common share and diluted earnings per common share. Basic earnings per common share are computed by dividing net income by the average number of common shares outstanding during the period. Diluted earnings per common share are computed by dividing net income by the average number of common shares outstanding during the period plus the impact of common stock equivalents. For the Years Ended December 31, 2023 2022 2021 (In thousands, except per share data) Net income (numerator) $ 161,768 $ 122,034 $ 86,509 Basic earnings per common share Weighted average number of common shares outstanding - basic (denominator) 26,703 26,895 26,855 Basic earnings per common share $ 6.06 $ 4.54 $ 3.22 Diluted earnings per common share Weighted average number of common shares outstanding - basic 26,703 26,895 26,855 Add common stock equivalents for options 3 12 15 Weighted average number of common shares outstanding - diluted (denominator) 26,706 26,907 26,870 Diluted earnings per common share $ 6.06 $ 4.54 $ 3.22 For the years ended December 31, 2023, 2022 2021, not

Note 18 - Westamerica Bancorpor

Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information)	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Condensed Financial Information of Parent Company Only Disclosure [Text Block]	Note 18: Statements of Income and Comprehensive Income For the Years Ended December 31, 2023 2022 2021 (In thousands) Dividends from subsidiaries $ 110,769 $ 70,267 $ 29,279 Interest income 57 49 44 Other income 11,935 11,386 11,608 Total income 122,761 81,702 40,931 Salaries and benefits 5,710 5,832 6,612 Other expense 2,315 2,609 2,279 Total expense 8,025 8,441 8,891 Income before taxes and equity in undistributed income of subsidiaries 114,736 73,261 32,040 Income tax expense (1,179 ) (881 ) (645 ) Earnings of subsidiaries greater than subsidiary dividends 48,211 49,654 55,114 Net income 161,768 122,034 86,509 Other comprehensive income (loss), net of tax 65,823 (305,769 ) (64,748 ) Comprehensive income (loss) $ 227,591 $ (183,735 ) $ 21,761 [The remainder of this page intentionally left blank] Balance Sheets At December 31, 2023 2022 (In thousands) Assets Cash $ 154,999 $ 99,478 Investment in Westamerica Bank 578,535 464,500 Investment in non-bank subsidiaries 451 453 Premises and equipment, net 9,123 9,411 Accounts receivable from Westamerica Bank 341 245 Other assets 45,694 44,831 Total assets $ 789,143 $ 618,918 Liabilities Accounts payable to Westamerica Bank $ 71 $ 40 Other liabilities 16,178 16,768 Total liabilities 16,249 16,808 Shareholders' equity 772,894 602,110 Total liabilities and shareholders' equity $ 789,143 $ 618,918 Statements of Cash Flows For the Years Ended December 31, 2023 2022 2021 (In thousands) Operating Activities Net income $ 161,768 $ 122,034 $ 86,509 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 539 563 569 Decrease (increase) in accounts receivable from affiliates 1,224 (771 ) 117 Increase in other assets (2,048 ) (1,639 ) (1,223 ) Stock option compensation expense 1,356 1,309 1,419 Provision for deferred income tax 1,179 881 645 (Decrease) increase in other liabilities (1,326 ) (38 ) 254 Earnings of subsidiaries greater than subsidiary dividends (48,211 ) (49,654 ) (55,114 ) Net Cash Provided by Operating Activities 114,481 72,685 33,176 Investing Activities Purchases of equipment (209 ) (5 ) (78 ) Net Cash Used in Investing Activities (209 ) (5 ) (78 ) Financing Activities Exercise of stock options 950 2,255 3,017 Retirement of common stock (13,747 ) (218 ) (232 ) Common stock dividends paid (45,954 ) (45,182 ) (44,304 ) Net Cash Used in Financing Activities (58,751 ) (43,145 ) (41,519 ) Net change in cash and due from banks 55,521 29,535 (8,421 ) Cash and due from banks at beginning of period 99,478 69,943 78,364 Cash and due from banks at end of period $ 154,999 $ 99,478 $ 69,943 Supplemental Cash Flow Disclosures: Supplemental disclosure of cash flow activities: Income tax payments for the period $ 64,017 39,840 27,673 [The remainder of this page intentionally left blank]

Note 19 - Quarterly Financial I

Note 19 - Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2023
Notes to Financial Statements
Quarterly Financial Information [Text Block]	Note 19: For the Three Months Ended March 31, June 30, September 30, December 31, (In thousands, except per share data and price range of common stock) 2023 Interest and loan fee income $ 69,624 $ 70,489 $ 72,848 $ 71,052 Net interest income 69,153 69,882 71,715 69,373 (Reversal of ) provision for loan losses (1,550 ) - 400 - Noninterest income 10,549 10,700 11,281 10,992 Noninterest expense 26,210 25,839 25,650 25,517 Income before taxes 55,042 54,743 56,946 54,848 Net income 40,451 40,248 41,601 39,468 Basic earnings per common share 1.51 1.51 1.56 1.48 Diluted earnings per common share 1.51 1.51 1.56 1.48 Dividends paid per common share 0.42 0.42 0.44 0.44 Price range, common stock 44.04 - 58.34 36.85 - 43.50 38.87 - 49.87 42.59 - 57.21 2022 Interest and loan fee income $ 43,759 $ 47,997 $ 60,802 $ 69,198 Net interest income 43,279 47,514 60,315 68,723 Provision for loan losses - - - - Noninterest income 11,576 11,264 11,818 10,463 Noninterest expense 24,875 24,629 24,767 25,090 Income before taxes 29,980 34,149 47,366 54,096 Net income 22,616 25,314 34,760 39,344 Basic earnings per common share 0.84 0.94 1.29 1.46 Diluted earnings per common share 0.84 0.94 1.29 1.46 Dividends paid per common share 0.42 0.42 0.42 0.42 Price range, common stock 57.54 - 62.76 55.66 - 61.30 52.29 - 61.52 52.22 - 63.39 2021 Interest and loan fee income $ 42,316 $ 44,276 $ 43,810 $ 43,041 Net interest income 41,841 43,792 43,318 42,537 Provision for loan losses - - - - Noninterest income 10,189 11,032 11,282 10,842 Noninterest expense 24,906 24,291 24,697 23,912 Income before taxes 27,124 30,533 29,903 29,467 Net income 20,147 22,579 22,063 21,720 Basic earnings per common share 0.75 0.84 0.82 0.81 Diluted earnings per common share 0.75 0.84 0.82 0.81 Dividends paid per common share 0.41 0.41 0.41 0.42 Price range, common stock 55.82 - 66.43 57.67 - 64.80 54.03 - 58.55 53.78 - 58.00 [The remainder of this page intentionally left blank]

Insider Trading Arrangements

Insider Trading Arrangements	12 Months Ended
	Dec. 31, 2023
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	ITEM 9B. Rule 10b5 1 During the quarter ended December 31, 2023, none 10b5 1 10b5 1 408
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Adopted [Flag]	false

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Use of Estimates, Policy [Policy Text Block]	Accounting Estimates. Certain accounting policies underlying the preparation of these financial statements require Management to make estimates, assumptions, and judgments that affect the amounts reported in the financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the financial statements; accordingly, as this information changes, the financial statements could reflect different estimates, assumptions, and judgments and as such have a greater possibility of producing results that could be materially different than originally reported. Estimates, assumptions, and judgments are necessary when assets and liabilities are required to be recorded at fair value, when a decline in fair value of an asset not third may
Consolidation, Policy [Policy Text Block]	Principles of Consolidation. The consolidated financial statements include the accounts of the Company and all the Company’s subsidiaries. Significant intercompany transactions have been eliminated in consolidation. The Company does not
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash. Cash includes Due From Banks balances which are readily convertible to known amounts of cash and are generally 90
Marketable Securities, Policy [Policy Text Block]	Equity Securities. Equity securities consist of marketable equity securities and mutual funds which are recorded at fair value. Unrealized gains and losses are included in net income. There were no equity securities at December 31, 2023 December 31, 2022. Debt Securities. Debt securities consist of the securities of government sponsored entities, states, counties, municipalities, corporations, agency and non-agency mortgage-backed securities, collateralized loan obligations and commercial paper. Securities transactions are recorded on a trade date basis. The Company classifies its debt securities in one three not not The Company utilizes third 1 2 third one third third not 3 The Company follows the guidance issued by the Board of Governors of the Federal Reserve System, “Investing in Securities without Reliance on Nationally Recognized Statistical Rating Agencies” (SR 12 15 To the extent that debt securities in the held-to-maturity portfolio share common risk characteristics, estimated expected credit losses are calculated in a manner like that used for loans held for investment. That is, for pools of such securities with common risk characteristics, the historical lifetime probability of default and severity of loss in the event of default is derived or obtained from external sources and adjusted for the expected effects of reasonable and supportable forecasts over the expected lives of the securities on those historical credit losses. Expected credit loss on each security in the held-to-maturity portfolio that do not may not Available for sale debt securities in unrealized loss positions are evaluated for credit related loss at least quarterly. For available for sale debt securities, a decline in fair value due to credit loss results in recording an allowance for credit losses to the extent the fair value is less than the amortized cost basis. Declines in fair value that have not not not not If the Company intends to sell a debt security or more likely than not Purchase premiums are amortized to the earliest call date and purchase discounts are amortized to maturity as an adjustment to yield using the effective interest method. Unamortized premiums, unaccreted discounts, and early payment premiums are recognized as a component of gain or loss on sale upon disposition of the related security. Interest and dividend income are recognized when earned. Realized gains and losses from the sale of available for sale debt securities are included in earnings using the specific identification method.
Equity Securities without Readily Determinable Fair Value [Policy Text Block]	Nonmarketable Equity Securities. Nonmarketable equity securities include securities that are not
Financing Receivable [Policy Text Block]	Loans. Loans are stated at the principal amount outstanding, net of unearned discount and unamortized deferred fees and costs. Interest is accrued daily on the outstanding principal balances and included in other assets. Loans which are more than 90 days delinquent with respect to interest or principal, unless they are well secured and in the process of collection, and other loans on which full recovery of principal or interest is in doubt, are placed on nonaccrual status. Interest previously accrued on loans placed on nonaccrual status is charged against interest income. In addition, some loans secured by real estate and commercial loans to borrowers experiencing financial difficulties are placed on nonaccrual status even though the borrowers continue to repay the loans as scheduled. When the ability to fully collect nonaccrual loan principal is in doubt, payments received are applied against the principal balance of the loans on a cost-recovery method until such time as full collection of the remaining recorded balance is expected. Any additional interest payments received after that time are recorded as interest income on a cash basis. Nonaccrual loans are reinstated to accrual status when none
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]	Allowance for Credit Losses. The Company extends loans to commercial and consumer customers primarily in Northern and Central California. These lending activities expose the Company to the risk borrowers will default, causing loan losses. The Company’s lending activities are exposed to various qualitative risks. All loan segments are exposed to risks inherent in the economy and market conditions. Significant risk characteristics related to the commercial loan segment include the borrowers’ business performance and financial condition, and the value of collateral for secured loans. Significant risk characteristics related to the commercial real estate segment include the borrowers’ business performance and the value of properties collateralizing the loans. Significant risk characteristics related to the construction loan segment include the borrowers’ performance in successfully developing the real estate into the intended purpose and the value of the property collateralizing the loans. Significant risk characteristics related to the residential real estate segment include the borrowers’ financial wherewithal to service the mortgages and the value of the property collateralizing the loans. Significant risk characteristics related to the consumer loan segment include the financial condition of the borrowers and the value of collateral securing the loans. The preparation of these financial statements requires Management to estimate the amount of expected losses over the expected contractual life of the Bank’s existing loan portfolio and establish an allowance for credit losses. Loan agreements generally include a maturity date, and the Company considers the contractual life of a loan agreement to extend from the date of origination to the contractual maturity date. In estimating credit losses, Management must exercise significant judgment in evaluating information deemed relevant. The amount of ultimate losses on the loan portfolio can vary from the estimated amounts. Management follows a systematic methodology to estimate loss potential in an effort to reduce the differences between estimated and actual losses. The allowance for credit losses is established through provisions for credit losses charged to income. Losses on loans are charged to the allowance for credit losses when all or a portion of the recorded amount of a loan is deemed to be uncollectible. Recoveries of loans previously charged off are credited to the allowance when realized. The Company’s allowance for credit losses is maintained at a level considered adequate to provide for expected losses based on historical loss rates adjusted for current and expected conditions over a forecast period. These include conditions unique to individual borrowers, as well as overall credit loss experience, the amount of past due, nonperforming and classified loans, recommendations of regulatory authorities, prevailing economic conditions, or credit protection agreements and other factors. Loans that share common risk characteristics are segregated into pools based on common characteristics, which is primarily determined by loan, borrower, or collateral type. Historical loss rates are determined for each pool. For consumer installment loans, primarily secured by automobiles, historical loss rates are determined using a vintage methodology, which tracks losses based on period of origination. For commercial, construction, and commercial real estate, historical loss rates are determined using an open pool methodology where losses are tracked over time for all loans included in the pool at the historical measurement date. Historical loss rates are adjusted for factors that are not not two not not two Loans that do not not Accrued interest is recorded in other assets and is excluded from the estimation of expected credit loss. Accrued interest is reversed through interest income when amounts are determined to be uncollectible, which generally occurs when the underlying receivable is placed on nonaccrual status or charged off.
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	Liability for Off-Balance Sheet Credit Exposures. Off-balance sheet credit exposures relate to letters of credit and unfunded loan commitments for commercial, construction and consumer loans. The Company maintains a separate allowance for credit losses from off-balance-sheet credit exposures, which is included within other liabilities on the consolidated statements of financial condition. Increases or reductions to the Company’s allowance for credit losses from off-balance sheet credit exposures are recorded in other expenses. Management estimates the amount of expected losses by estimating expected usage exposures that are not No may Nonrefundable fees and certain costs associated with originating or acquiring loans are deferred and amortized as an adjustment to interest income over the contractual loan lives. Upon prepayment, unamortized loan fees, net of costs, are immediately recognized in interest income. Other fees, including those collected upon principal prepayments, are included in interest income when received. Loans held for sale are identified upon origination and are reported at the lower of cost or market value on an aggregate loan basis.
Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block]	Other Real Estate Owned. Other real estate owned is comprised of property acquired through foreclosure proceedings, acceptances of deeds-in-lieu of foreclosure and, if applicable, vacated bank properties. Losses recognized at the time of acquiring property in full or partial satisfaction of debt are charged against the allowance for credit losses. Other real estate owned is recorded at the fair value of the collateral, generally based upon an independent property appraisal, less estimated disposition costs. Losses incurred subsequent to acquisition due to any decline in annual independent property appraisals are recognized as noninterest expense. Routine holding costs, such as property taxes, insurance and maintenance, and losses from sales and dispositions, are recognized as noninterest expense.
Property, Plant and Equipment, Policy [Policy Text Block]	Premises and Equipment. Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation is computed substantially on the straight-line method over the estimated useful life of each type of asset. Estimated useful lives of premises and equipment range from 20 to 50 years and from 3 to 20 years, respectively. Leasehold improvements are amortized over the terms of the lease or their estimated useful life, whichever is shorter.
Revenue from Contract with Customer [Policy Text Block]	Revenue Recognition. The Company recognizes revenue as it is earned based on contractual terms, as transactions occur, or as services are provided and collectability is reasonably assured. In certain circumstances, noninterest income is reported net of associated expenses that are directly related to variable volume-based sales or revenue sharing arrangements or when the Company acts on an agency basis for others.
Life Insurance Cash Surrender Value [Policy Text Block]	Life Insurance Cash Surrender Value. The Company has purchased life insurance policies on certain directors and officers as well as acquired such assets as part of the acquisition of other banks. Company owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. These assets are included in other assets on the consolidated balance sheets.
Goodwill and Intangible Assets, Policy [Policy Text Block]	Intangible Assets. Intangible assets are comprised of goodwill, core deposit intangibles and other identifiable intangibles acquired in business combinations. Intangible assets with finite useful lives are amortized on an accelerated basis over their respective estimated useful lives not not not not
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets. The Company reviews its long-lived and certain intangible assets for impairment whenever events or changes indicate that the carrying amount of an asset may not
Income Tax, Policy [Policy Text Block]	Income Taxes. The Company and its subsidiaries file consolidated tax returns. The Company accounts for income taxes in accordance with FASB ASC 740, two not. not fifty
Share-Based Payment Arrangement [Policy Text Block]	Stock-Based Compensation. The Company applies FASB ASC 718 no
Fiduciary [Policy Text Block]	Other. Securities and other property held by the Bank in a fiduciary or agency capacity are not not
Currently Adopted Accounting Pronouncements [Policy Text Block]	Recently Adopted Accounting Standards In the year ended December 31, 2021, FASB ASU 2019 12 Income Taxes (Topic 740 December 2019. 740 December 15, 2020, January 1, 2021 not In the year ended December 31, 2023, FASB ASU 2022 02 Credit Losses (Topic 326 March 2022, January 1, 2023 January 1, 2023. not
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Standards FASB ASU 2020 04 Reference Rate Reform (Topic 848 March 2020. no not 2020 04 December 2022, 2022 06, Reference Rate Reform (Topic 848 848. 2022 06 2020 04 December 2024. not FASB ASU 2022 03 Fair Value Measurement (Topic 820 June 2022. 820 1 2 3 December 15, 2023, FASB ASU 2023 02 Investments Equity Method and Joint Ventures (Topic 323 March 2023. December 15, 2023,

Note 2 - Investment Securities

Note 2 - Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Debt Securities, Available-for-sale and Held-to-maturity [Table Text Block]	At December 31, 2023 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) Debt securities available for sale: Agency residential mortgage-backed securities ("MBS") $ 258,150 $ 6 $ (18,702 ) $ 239,454 Securities of U.S. Government sponsored entities 308,768 2 (13,851 ) 294,919 Obligations of states and political subdivisions 72,679 42 (1,438 ) 71,283 Corporate securities 2,129,103 480 (220,035 ) 1,909,548 Collateralized loan obligations 1,501,248 830 (17,481 ) 1,484,597 Total debt securities available for sale 4,269,948 1,360 (271,507 ) 3,999,801 Debt securities held to maturity: Agency residential MBS 78,565 17 (5,270 ) 73,312 Obligations of states and political subdivisions 71,182 47 (335 ) 70,894 Corporate securities 728,650 84 (23,378 ) 705,356 Total debt securities held to maturity 878,397 148 (28,983 ) 849,562 Total $ 5,148,345 $ 1,508 $ (300,490 ) $ 4,849,363 At December 31, 2022 Gross Gross Amortized Unrealized Unrealized Fair Cost Gains Losses Value (In thousands) Debt securities available for sale: Agency residential MBS $ 311,089 $ 4 $ (25,045 ) $ 286,048 Securities of U.S. Government sponsored entities 306,336 3 (15,486 ) 290,853 Obligations of states and political subdivisions 84,024 59 (2,079 ) 82,004 Corporate securities 2,406,566 1,032 (307,643 ) 2,099,955 Collateralized loan obligations 1,587,326 527 (14,970 ) 1,572,883 Total debt securities available for sale 4,695,341 1,625 (365,223 ) 4,331,743 Debt securities held to maturity: Agency residential MBS 104,852 13 (7,503 ) 97,362 Obligations of states and political subdivisions 89,208 73 (538 ) 88,743 Corporate securities 721,854 - (34,448 ) 687,406 Total debt securities held to maturity 915,914 86 (42,489 ) 873,511 Total $ 5,611,255 $ 1,711 $ (407,712 ) $ 5,205,254
Investments Classified by Contractual Maturity Date [Table Text Block]	At December 31, 2023 Debt Securities Available Debt Securities Held for Sale to Maturity Amortized Fair Amortized Fair Cost Value Cost Value (In thousands) Maturity in years: 1 year or less $ 52,703 $ 52,357 $ 15,117 $ 15,095 Over 1 to 5 years 756,658 721,179 312,847 307,557 Over 5 to 10 years 1,701,189 1,502,214 471,868 453,598 Subtotal 2,510,550 2,275,750 799,832 776,250 Collateralized loan obligations 1,501,248 1,484,597 - - Agency residential MBS 258,150 239,454 78,565 73,312 Total $ 4,269,948 $ 3,999,801 $ 878,397 $ 849,562 At December 31, 2022 Debt Securities Available Debt Securities Held for Sale to Maturity Amortized Fair Amortized Fair Cost Value Cost Value (In thousands) Maturity in years: 1 year or less $ 251,578 $ 250,317 $ 12,676 $ 12,659 Over 1 to 5 years 578,886 548,787 161,653 158,409 Over 5 to 10 years 1,966,462 1,673,708 636,733 605,081 Subtotal 2,796,926 2,472,812 811,062 776,149 Collateralized loan obligations 1,587,326 1,572,883 - - Agency residential MBS 311,089 286,048 104,852 97,362 Total $ 4,695,341 $ 4,331,743 $ 915,914 $ 873,511
Schedule of Unrealized Loss on Investments 1 [Table Text Block]	Debt Securities Available for Sale At December 31, 2023 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 1 $ 115 $ (2 ) 107 $ 238,642 $ (18,700 ) 108 $ 238,757 $ (18,702 ) Securities of U.S. Government sponsored entities 2 9,746 (15 ) 19 278,265 (13,836 ) 21 288,011 (13,851 ) Obligations of states and political subdivisions 2 2,280 (15 ) 50 57,614 (1,423 ) 52 59,894 (1,438 ) Corporate securities - - - 151 1,894,602 (220,035 ) 151 1,894,602 (220,035 ) Collateralized loan obligations 34 428,363 (8,914 ) 67 578,643 (8,567 ) 101 1,007,006 (17,481 ) Total 39 $ 440,504 $ (8,946 ) 394 $ 3,047,766 $ (262,561 ) 433 $ 3,488,270 $ (271,507 ) Debt Securities Held to Maturity At December 31, 2023 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 1 $ - $ - 93 $ 72,376 $ (5,270 ) 94 $ 72,376 $ (5,270 ) Obligations of states and political subdivisions 23 18,599 (90 ) 26 25,466 (245 ) 49 44,065 (335 ) Corporate securities 3 26,567 (1,184 ) 46 641,598 (22,194 ) 49 668,165 (23,378 ) Total 27 $ 45,166 $ (1,274 ) 165 $ 739,440 $ (27,709 ) 192 $ 784,606 $ (28,983 ) Debt Securities Available for Sale At December 31, 2022 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrealized Investment Unrealized Investment Unrealized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 107 $ 279,139 $ (24,222 ) 9 $ 6,110 $ (823 ) 116 $ 285,249 $ (25,045 ) Securities of U.S. Government sponsored entities 22 289,067 (15,486 ) - - - 22 289,067 (15,486 ) Obligations of states and political subdivisions 56 65,633 (1,902 ) 8 3,265 (177 ) 64 68,898 (2,079 ) Corporate securities 133 1,521,294 (170,453 ) 56 555,727 (137,190 ) 189 2,077,021 (307,643 ) Collateralized loan obligations 58 518,074 (13,772 ) 20 192,692 (1,198 ) 78 710,766 (14,970 ) Total 376 $ 2,673,207 $ (225,835 ) 93 $ 757,794 $ (139,388 ) 469 $ 3,431,001 $ (365,223 ) Debt Securities Held to Maturity At December 31, 2022 No. of Less than 12 months No. of 12 months or longer No. of Total Investment Unrecognized Investment Unrecognized Investment Unrecognized Positions Fair Value Losses Positions Fair Value Losses Positions Fair Value Losses ($ in thousands) Agency residential MBS 97 $ 95,814 $ (7,404 ) 2 $ 682 $ (99 ) 99 $ 96,496 $ (7,503 ) Obligations of states and political subdivisions 54 53,536 (538 ) - - - 54 53,536 (538 ) Corporate securities 49 672,406 (34,448 ) - - - 49 672,406 (34,448 ) Total 200 $ 821,756 $ (42,390 ) 2 $ 682 $ (99 ) 202 $ 822,438 $ (42,489 )
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Allowance for credit losses: Beginning balance $ 1 $ 7 $ 9 Reversal of provision for credit losses - (6 ) (2 ) Chargeoffs - - - Recoveries - - - Total ending balance $ 1 $ 1 $ 7
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block]	Credit Risk Profile by Credit Rating At December 31, 2023 AAA/AA/A BBB+ Not Rated Total (In thousands) Agency residential MBS $ 78,092 $ - $ 473 $ 78,565 Obligations of states and political subdivisions 71,002 - 180 71,182 Corporate securities 506,508 222,142 - 728,650 Total $ 655,602 $ 222,142 $ 653 $ 878,397
Interest Income from Investments [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Taxable $ 221,742 $ 158,465 $ 106,329 Tax-exempt from regular federal income tax 4,484 5,819 8,424 Total interest income from investment securities $ 226,226 $ 164,284 $ 114,753

Note 3 - Loans and Allowance _2

Note 3 - Loans and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Loans Receivable [Table Text Block]	At December 31, At December 31, 2023 2022 (In thousands) Commercial $ 136,550 $ 169,617 Commercial real estate 487,523 491,107 Construction 5,063 3,088 Residential real estate 9,935 13,834 Consumer installment & other 227,531 280,842 Total $ 866,602 $ 958,488
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]	Allowance for Credit Losses For the Year Ended December 31, 2023 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 6,138 $ 5,888 $ 150 $ 32 $ 8,076 $ 20,284 (Reversal) provision (3,871 ) 11 95 (6 ) 2,621 (1,150 ) Chargeoffs (410 ) (45 ) - - (7,499 ) (7,954 ) Recoveries 2,359 71 - - 3,257 5,687 Total allowance for credit losses $ 4,216 $ 5,925 $ 245 $ 26 $ 6,455 $ 16,867 Allowance for Credit Losses For the Year Ended December 31, 2022 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 6,966 $ 6,529 $ 2 $ 45 $ 9,972 $ 23,514 (Reversal) provision (1,184 ) (703 ) 148 (13 ) 1,758 6 Chargeoffs (20 ) - - - (6,205 ) (6,225 ) Recoveries 376 62 - - 2,551 2,989 Total allowance for credit losses $ 6,138 $ 5,888 $ 150 $ 32 $ 8,076 $ 20,284 Allowance for Credit Losses For the Year Ended December 31, 2021 Consumer Commercial Residential Installment Commercial Real Estate Construction Real Estate and Other Total (In thousands) Allowance for credit losses: Balance at beginning of period $ 9,205 $ 5,660 $ 6 $ 47 $ 8,936 $ 23,854 (Reversal) provision (2,411 ) 126 (4 ) (2 ) 2,293 2 Chargeoffs (56 ) - - - (3,192 ) (3,248 ) Recoveries 228 743 - - 1,935 2,906 Total allowance for credit losses $ 6,966 $ 6,529 $ 2 $ 45 $ 9,972 $ 23,514
Financing Receivable Credit Quality Indicators [Table Text Block]	Credit Risk Profile by Internally Assigned Grade At December 31, 2023 Commercial Commercial Real Estate Construction Residential Real Estate Consumer Installment and Other Total (In thousands) Grade: Pass $ 130,001 $ 475,870 $ 5,063 $ 9,606 $ 225,089 $ 845,629 Substandard 6,549 11,653 - 329 377 18,908 Doubtful - - - - 1,479 1,479 Loss - - - - 586 586 Total $ 136,550 $ 487,523 $ 5,063 $ 9,935 $ 227,531 $ 866,602 Credit Risk Profile by Internally Assigned Grade At December 31, 2022 Commercial Commercial Real Estate Construction Residential Real Estate Consumer Installment and Other Total (In thousands) Grade: Pass $ 169,040 $ 477,842 $ 3,088 $ 13,457 $ 278,223 $ 941,650 Substandard 577 13,265 - 377 1,079 15,298 Doubtful - - - - 752 752 Loss - - - - 788 788 Total $ 169,617 $ 491,107 $ 3,088 $ 13,834 $ 280,842 $ 958,488
Financing Receivable, Past Due [Table Text Block]	Summary of Loans by Delinquency and Nonaccrual Status At December 31, 2023 Current and Accruing 30-59 Days Past Due and Accruing 60-89 Days Past Due and Accruing Past Due 90 Days or More and Accruing Nonaccrual Total Loans (In thousands) Commercial $ 136,421 $ 58 $ - $ - $ 71 $ 136,550 Commercial real estate 485,476 951 766 - 330 487,523 Construction 5,063 - - - - 5,063 Residential real estate 9,933 - - - 2 9,935 Consumer installment and other 220,357 5,544 1,242 388 - 227,531 Total $ 857,250 $ 6,553 $ 2,008 $ 388 $ 403 $ 866,602 Summary of Loans by Delinquency and Nonaccrual Status At December 31, 2022 Current and Accruing 30-59 Days Past Due and Accruing 60-89 Days Past Due and Accruing Past Due 90 Days or More and Accruing Nonaccrual Total Loans (In thousands) Commercial $ 169,337 $ 172 $ 58 $ - $ 50 $ 169,617 Commercial real estate 490,354 508 192 - 53 491,107 Construction 3,088 - - - - 3,088 Residential real estate 13,430 377 - - 27 13,834 Consumer installment and other 273,247 5,101 1,850 628 16 280,842 Total $ 949,456 $ 6,158 $ 2,100 $ 628 $ 146 $ 958,488
Financing Receivable, Loans by Risk Category [Table Text Block]	At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Commercial loans by grade: Pass $ 20,554 $ 4,471 $ 12,601 $ 31,770 $ 22,146 $ 13,112 $ 104,654 $ 25,347 $ 130,001 Substandard 12 2,492 - 2,835 - - 5,339 1,210 6,549 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 20,566 $ 6,963 $ 12,601 $ 34,605 $ 22,146 $ 13,112 $ 109,993 $ 26,557 $ 136,550 Current gross chargeoffs on commercial loans: For the year ended December 31, 2023 $ - $ - $ 3 $ 135 $ - $ - $ 138 $ 272 $ 410 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Commercial loans by grade: Pass $ 23,891 $ 5,549 $ 12,557 $ 17,293 $ 53,928 $ 23,966 $ 137,184 $ 31,856 $ 169,040 Substandard 12 - - - - - 12 565 577 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 23,903 $ 5,549 $ 12,557 $ 17,293 $ 53,928 $ 23,966 $ 137,196 $ 32,421 $ 169,617 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Commercial real estate loans by grade: Pass $ 172,925 $ 68,156 $ 69,324 $ 68,891 $ 50,899 $ 45,675 $ 475,870 $ - $ 475,870 Substandard 10,056 811 786 - - - 11,653 - 11,653 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 182,981 $ 68,967 $ 70,110 $ 68,891 $ 50,899 $ 45,675 $ 487,523 $ - $ 487,523 Current gross chargeoffs on commercial real estate loans: For the year ended December 31, 2023 $ 45 $ - $ - $ - $ - $ - $ 45 $ - $ 45 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Commercial real estate loans by grade: Pass $ 146,588 $ 58,473 $ 71,440 $ 74,016 $ 71,618 $ 55,707 $ 477,842 $ - $ 477,842 Substandard 8,083 - 2,112 806 - 2,264 13,265 - 13,265 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 154,671 $ 58,473 $ 73,552 $ 74,822 $ 71,618 $ 57,971 $ 491,107 $ - $ 491,107 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Residential real estate loans by grade: Pass $ 9,606 $ - $ - $ - $ - $ - $ 9,606 $ - $ 9,606 Substandard 329 - - - - - 329 - 329 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 9,935 $ - $ - $ - $ - $ - $ 9,935 $ - $ 9,935 Current gross chargeoffs on residential real estate loans: For the year ended December 31, 2023 $ - $ - $ - $ - $ - $ - $ - $ - $ - At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Residential real estate loans by grade: Pass $ 13,457 $ - $ - $ - $ - $ - $ 13,457 $ - $ 13,457 Substandard 377 - - - - - 377 - 377 Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ 13,834 $ - $ - $ - $ - $ - $ 13,834 $ - $ 13,834 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Construction loans by grade: Pass $ - $ - $ - $ - $ - $ - $ - $ 5,063 $ 5,063 Substandard - - - - - - - - - Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ - $ - $ - $ - $ - $ - $ - $ 5,063 $ 5,063 Current gross chargeoffs on construction loans: For the year ended December 31, 2023 $ - $ - $ - $ - $ - $ - $ - $ - $ - At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Construction loans by grade: Pass $ - $ - $ - $ - $ - $ - $ - $ 3,088 $ 3,088 Substandard - - - - - - - - - Doubtful - - - - - - - - - Loss - - - - - - - - - Total $ - $ - $ - $ - $ - $ - $ - $ 3,088 $ 3,088 At December 31, 2023 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2019 2020 2021 2022 2023 Term Loans Cost Basis Total (In thousands) Consumer installment and other loans by delinquency and nonaccrual status: Current $ 6,545 $ 12,144 $ 22,700 $ 51,055 $ 71,388 $ 38,699 $ 202,531 $ 17,826 $ 220,357 30-59 days past due 160 277 600 2,345 1,733 332 5,447 97 5,544 60-89 days past due 31 51 153 410 430 122 1,197 45 1,242 Past due 90 days or more - 8 88 143 138 - 377 11 388 Nonaccrual - - - - - - - - - Total $ 6,736 $ 12,480 $ 23,541 $ 53,953 $ 73,689 $ 39,153 $ 209,552 $ 17,979 $ 227,531 Current gross chargeoffs on consumer installment and other loans: For the year ended December 31, 2023 $ 246 $ 161 $ 843 $ 2,329 $ 3,191 $ 453 $ 7,223 $ 276 $ 7,499 At December 31, 2022 Line of Credit Term Loans Amortized Cost Basis by Origination Year Total Amortized Prior 2018 2019 2020 2021 2022 Term Loans Cost Basis Total (In thousands) Consumer installment and other loans by delinquency and nonaccrual status: Current $ 6,017 $ 13,147 $ 22,330 $ 35,783 $ 76,126 $ 99,414 $ 252,817 $ 20,430 $ 273,247 30-59 days past due 117 268 572 1,014 1,709 1,359 5,039 62 5,101 60-89 days past due 42 65 67 275 635 750 1,834 16 1,850 Past due 90 days or more 3 20 16 61 284 241 625 3 628 Nonaccrual - - - - - - - 16 16 Total $ 6,179 $ 13,500 $ 22,985 $ 37,133 $ 78,754 $ 101,764 $ 260,315 $ 20,527 $ 280,842

Note 5 - Premises, Equipment,_2

Note 5 - Premises, Equipment, Other Assets and Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Premises and Equipment [Table Text Block]	At December 31, Cost Accumulated Depreciation and Amortization Net Book Value (In thousands) 2023 Land $ 11,453 $ - $ 11,453 Building and improvements 43,185 (31,742 ) 11,443 Leasehold improvements 7,622 (6,550 ) 1,072 Furniture and equipment 26,586 (23,538 ) 3,048 Total $ 88,846 $ (61,830 ) $ 27,016 2022 Land $ 11,453 $ - $ 11,453 Building and improvements 42,528 (30,601 ) 11,927 Leasehold improvements 8,157 (6,897 ) 1,260 Furniture and equipment 26,766 (22,587 ) 4,179 Total $ 88,904 $ (60,085 ) $ 28,819
Schedule of Other Assets [Table Text Block]	At December 31, At December 31, 2023 2022 (In thousands) Cost method equity investments: Federal Reserve Bank stock (1) $ 14,069 $ 11,743 Other investments 158 158 Total cost method equity investments 14,227 11,901 Life insurance cash surrender value 66,611 63,816 Net deferred tax asset 99,507 125,140 Right-of-use asset 18,814 15,746 Limited partnership investments 28,667 34,421 Interest receivable 54,568 53,558 Prepaid assets 5,200 4,894 Other assets 9,716 9,670 Total other assets $ 297,310 $ 319,146
Schedule of Amounts Recognized in Net Income [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Investment loss included in pre-tax income $ 5,754 $ 5,724 $ 2,620 Tax credits recognized in provision for income taxes 3,435 3,250 2,300
Other Liabilities [Table Text Block]	At December 31, At December 31, 2023 2022 (In thousands) Operating lease liability $ 18,814 $ 15,746 Other liabilities 40,455 49,379 Total other liabilities $ 59,269 $ 65,125
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]	Minimum At December 31, 2023 (In thousands) 2024 $ 6,067 2025 5,178 2026 3,518 2027 2,621 2028 1,865 Thereafter 818 Total minimum lease payments 20,067 Less: discount (1,253 ) Present value of lease liability $ 18,814

Note 6 - Goodwill and Identif_2

Note 6 - Goodwill and Identifiable Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Goodwill [Table Text Block]	At December 31, 2023 At December 31, 2022 (In thousands) Goodwill $ 121,673 $ 121,673
Schedule of Finite-Lived Intangible Assets [Table Text Block]	At December 31, 2023 At December 31, 2022 Gross Gross Carrying Accumulated Carrying Accumulated Amount Amortization Amount Amortization (In thousands) Core deposit intangibles $ 56,808 $ (56,461 ) $ 56,808 $ (56,225 )
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	Total Core Deposit Intangibles (In thousands) For the year ended December 31, 2023 (actual) $ 236 2024 222 2025 125

Note 7 - Deposits and Borrowe_2

Note 7 - Deposits and Borrowed Funds (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Deposit Liabilities, Type [Table Text Block]	Deposits At December 31, At December 31, 2023 2022 (In thousands) Noninterest-bearing $ 2,605,844 $ 2,947,277 Interest-bearing: Transaction 1,072,233 1,273,143 Savings 1,699,388 1,874,115 Time deposits less than $100 thousand 56,100 65,962 Time deposits $100 thousand through $250 thousand 31,107 42,733 Time deposits more than $250 thousand 9,595 22,060 Total deposits $ 5,474,267 $ 6,225,290
Schedule of Repurchase Agreements [Table Text Block]	Repurchase Agreements (Sweep) Remaining Contractual Maturity of the Agreements Overnight and Continuous At December 31, At December 31, 2023 2022 Repurchase agreements: (In thousands) Collateral securing borrowings: Agency residential MBS $ 25,669 $ 30,108 Corporate securities 233,947 203,774 Total collateral carrying value $ 259,616 $ 233,882 Total short-term borrowed funds $ 58,162 $ 57,792
Borrowed Funds Highest Month End Balance [Table Text Block]	For the Years Ended December 31, 2023 2022 Highest Balance at Any Month-end (In thousands) Securities sold under repurchase agreements $ 138,005 $ 257,560

Note 8 - Shareholders' Equity (

Note 8 - Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]	Options Outstanding Options Exercisable At December 31, 2023 For the Year Ended December 31, 2023 At December 31, 2023 For the Year Ended December 31, 2023 Range of Exercise Price Number Outstanding Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Weighted Average Exercise Price Number Exercisable Aggregate Intrinsic Value Weighted Average Remaining Contractual Life Weighted Average Exercise Price (In thousands) (Years) (In thousands) (Years) $ 40 - 45 12 $ 149 1.9 $ 42 12 $ 149 1.9 $ 42 45 - 50 - - - - - - - - 50 - 55 4 8 0.1 53 4 8 0.1 53 55 - 60 572 - 7.6 57 213 - 6.1 58 60 - 65 247 - 4.6 62 247 - 4.6 62 65 - 70 138 - 6.1 66 138 - 6.1 66 $ 40 - 70 973 $ 157 6.5 60 614 $ 157 5.4 61
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 Expected volatility (1) 20 % 19 % 20 % Expected life in years (2) 4.7 4.6 4.7 Risk-free interest rate (3) 3.60 % 1.73 % 0.46 % Expected dividend yield 3.66 % 3.02 % 2.79 % Fair value per award $ 8.50 $ 7.90 $ 7.50
Share-Based Payment Arrangement, Option, Activity [Table Text Block]	Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Term (In thousands) (Years) Outstanding at January 1, 2023 854 $ 60.02 Granted 225 55.47 Exercised (22 ) 43.30 Forfeited or expired (84 ) 55.26 Outstanding at December 31, 2023 973 59.50 6.5 Exercisable at December 31, 2023 614 61.17 5.4
Schedule of Nonvested Share Activity [Table Text Block]	Shares Weighted Average Grant Date Fair Value (In thousands) Nonvested at January 1, 2023 346 $ 7.88 Granted 225 8.50 Vested (164 ) 7.99 Forfeited (48 ) 8.18 Nonvested at December 31, 2023 359 $ 8.18
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]	2023 2022 (In thousands) Outstanding at January 1, 31 30 Granted 12 12 Issued upon vesting (9 ) (8 ) Forfeited (2 ) (3 ) Outstanding at December 31, 32 31

Note 9 - Regulatory Capital (Ta

Note 9 - Regulatory Capital (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]	At December 31, 2023 Required To Be Well-capitalized Amount Ratio Amount Ratio Amount Ratio ($ in thousands) Common Equity Tier 1 Capital Company $ 841,611 18.76 % $ 313,959 7.00 % N/A N/A Bank 641,252 14.46 % 310,362 7.00 % $ 288,193 6.50 % Tier 1 Capital Company 841,611 18.76 % 381,236 8.50 % N/A N/A Bank 641,252 14.46 % 376,868 8.50 % 354,700 8.00 % Total Capital Company 858,680 19.15 % 470,939 10.50 % N/A N/A Bank 664,321 14.98 % 465,543 10.50 % 443,375 10.00 % Leverage Ratio (1) Company 841,611 12.86 % 261,739 4.00 % N/A N/A Bank 641,252 9.88 % 259,617 4.00 % 324,521 5.00 % At December 31, 2022 Required To Be Well-capitalized Amount Ratio Amount Ratio Amount Ratio ($ in thousands) Common Equity Tier 1 Capital Company $ 736,414 15.22 % $ 338,748 7.00 % N/A N/A Bank 592,804 12.37 % 335,351 7.00 % $ 311,397 6.50 % Tier 1 Capital Company 736,414 15.22 % 411,337 8.50 % N/A N/A Bank 592,804 12.37 % 407,212 8.50 % 383,258 8.00 % Total Capital Company 756,900 15.64 % 508,123 10.50 % N/A N/A Bank 619,290 12.93 % 503,026 10.50 % 479,073 10.00 % Leverage Ratio (1) Company 736,414 10.18 % 289,259 4.00 % N/A N/A Bank 592,804 8.26 % 287,229 4.00 % 359,036 5.00 %

Note 10 - Income Taxes (Tables)

Note 10 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	At December 31, 2023 2022 (In thousands) Deferred tax asset Allowance for credit losses $ 4,853 $ 5,858 Securities available for sale 79,865 107,493 State franchise taxes 4,816 3,805 Deferred compensation 3,828 4,091 Purchased assets and assumed liabilities 321 229 Post-retirement benefits 367 405 Employee benefit accruals 3,454 3,096 VISA Class B shares 343 507 Accrued liabilities 1,172 840 Premises and equipment 1,175 1,193 Lease liability 5,413 4,548 Other 69 99 Total deferred tax asset 105,676 132,164 Deferred tax liability Net deferred loan costs - 193 Right-of-use asset 5,413 4,548 Intangible assets 451 453 Limited partnership investments 305 1,830 Total deferred tax liability 6,169 7,024 Net deferred tax asset $ 99,507 $ 125,140
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Current income tax expense: Federal $ 38,075 $ 26,785 $ 15,299 State 23,731 16,075 11,320 Total current 61,806 42,860 26,619 Deferred income tax (benefit) expense: Federal (1,197 ) (1,349 ) 1,281 State (798 ) 2,046 842 Total deferred (1,995 ) 697 2,123 Provision for income taxes Federal - - (472 ) State - - 2,248 Total change in valuation reserve - - 1,776 Provision for income taxes $ 59,811 $ 43,557 $ 30,518
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Federal income taxes due at statutory rate $ 46,532 $ 34,774 $ 24,576 (Reductions) additions in income taxes resulting from: Interest on state and municipal securities and loans not taxable for federal income tax purposes (1,188 ) (1,484 ) (2,070 ) State franchise taxes, net of federal income tax benefit 18,117 14,315 9,757 Change in valuation reserve - - 1,776 Stock compensation deduction less than (in excess of) book expense 3 30 - Tax credits (2,943 ) (3,439 ) (2,621 ) Dividend received deduction (66 ) (56 ) (48 ) Cash value life insurance (597 ) (421 ) (389 ) Other (47 ) (162 ) (463 ) Provision for income taxes $ 59,811 $ 43,557 $ 30,518

Note 11 - Fair Value Measurem_2

Note 11 - Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	At December 31, 2023 Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (1) (In thousands) Debt securities available for sale: Agency residential MBS $ 239,454 $ - $ 239,454 $ - Securities of U.S. Government sponsored entities 294,919 - 294,919 - Obligations of states and political subdivisions 71,283 - 71,283 - Corporate securities 1,909,548 - 1,909,548 - Collateralized loan obligations 1,484,597 - 1,484,597 - Total debt securities available for sale $ 3,999,801 $ - $ 3,999,801 $ - At December 31, 2022 Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (1) (In thousands) Debt securities available for sale: Agency residential MBS $ 286,048 $ - $ 286,048 $ - Securities of U.S. Government sponsored entities 290,853 - 290,853 - Obligations of states and political subdivisions 82,004 - 82,004 - Corporate securities 2,099,955 - 2,099,955 - Collateralized loan obligations 1,572,883 - 1,572,883 - Total debt securities available for sale $ 4,331,743 $ - $ 4,331,743 $ -
Fair Value Measurements, Nonrecurring [Table Text Block]	For the Year Ended At December 31, 2023 December 31, 2023 Carrying Value Level 1 Level 2 Level 3 Total Losses (In thousands) Loans: Commercial real estate $ 110 $ - $ - $ 110 $ - Total assets measured at fair value on a nonrecurring basis $ 110 $ - $ - $ 110 $ - For the Year Ended At December 31, 2022 December 31, 2022 Carrying Value Level 1 Level 2 Level 3 Total Losses (In thousands) Loans: Commercial real estate $ 225 $ - $ - $ 225 $ - Total assets measured at fair value on a nonrecurring basis $ 225 $ - $ - $ 225 $ -
Fair Value, by Balance Sheet Grouping [Table Text Block]	At December 31, 2023 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Financial Assets: (In thousands) Cash and due from banks $ 190,314 $ 190,314 $ 190,314 $ - $ - Debt securities held to maturity 878,396 849,562 - 849,562 - Loans 849,735 847,031 - - 847,031 Financial Liabilities: Deposits $ 5,474,267 $ 5,474,012 $ - $ 5,377,465 $ 96,547 Short-term borrowed funds 58,162 58,162 - 58,162 - At December 31, 2022 Carrying Amount Estimated Fair Value Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs Financial Assets: (In thousands) Cash and due from banks $ 294,236 $ 294,236 $ 294,236 $ - $ - Debt securities held to maturity 915,913 873,511 - 873,511 - Loans 938,204 905,720 - - 905,720 Financial Liabilities: Deposits $ 6,225,290 $ 6,224,791 $ - $ 6,094,535 $ 130,256 Short-term borrowed funds 57,792 57,792 - 57,792 -

Note 13 - Retirement Benefit _2

Note 13 - Retirement Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Net Benefit Costs [Table Text Block]	At December 31, 2023 2022 2021 (In thousands) Service benefit $ (56 ) $ (19 ) $ (15 ) Interest cost 70 38 30 Net periodic cost $ 14 $ 19 $ 15
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]	At December 31, 2023 2022 2021 Change in benefit obligation (In thousands) Benefit obligation at beginning of year $ 1,401 $ 1,527 $ 1,654 Service benefit (56 ) (19 ) (15 ) Interest cost 70 38 30 Benefits paid (139 ) (145 ) (142 ) Benefit obligation at end of year $ 1,276 $ 1,401 $ 1,527 Accumulated post-retirement benefit obligation attributable to: Retirees $ 1,276 $ 1,401 $ 1,527 Other - - - Total $ 1,276 $ 1,401 $ 1,527 Fair value of plan assets - - - Accumulated post-retirement benefit obligation in excess of plan assets $ 1,276 $ 1,401 $ 1,527
Defined Benefit Plan, Assumptions [Table Text Block]	At December 31, 2023 2022 2021 Weighted-average assumptions used to determine benefit obligations Discount rate 4.75 % 5.01 % 2.46 % Weighted-average assumptions used to determine net periodic benefit cost Discount rate 5.01 % 2.46 % 1.80 %
Schedule of Expected Benefit Payments [Table Text Block]	Estimated future benefit payments (In thousands) 2024 $ 133 2025 133 2026 133 2027 127 2028 118 Years 2029-2033 424

Note 14 - Related Party Trans_2

Note 14 - Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Related Party Transactions [Table Text Block]	2023 2022 ($ in thousands) Balance at January 1, $ 400 $ 454 Originations - - Principal reductions (51 ) (54 ) Balance at December 31, $ 349 $ 400 Percent of total loans outstanding. 0.04 % 0.04 %

Note 16 - Other Comprehensive_2

Note 16 - Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Comprehensive Income (Loss) [Table Text Block]	2023 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized losses arising during the year $ 93,326 $ (27,591 ) $ 65,735 Reclassification of losses included in net income 125 (37 ) 88 Other comprehensive income $ 93,451 $ (27,628 ) $ 65,823 2022 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized losses/gains arising during the year $ (434,107 ) $ 128,338 $ (305,769 ) Other comprehensive loss $ (434,107 ) $ 128,338 $ (305,769 ) 2021 Before tax Tax effect Net of tax (In thousands) Debt securities available for sale: Changes in net unrealized gains arising during the year $ (91,891 ) $ 27,167 $ (64,724 ) Reclassification of gains included in net income (34 ) 10 (24 ) Other comprehensive loss $ (91,925 ) $ 27,177 $ (64,748 )
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Accumulated Other Comprehensive Income (Loss) (In thousands) Balance, December 31, 2020 $ 114,412 Changes in unrealized gains on debt securities available for sale, net of tax (64,748 ) Balance, December 31, 2021 49,664 Changes in unrealized losses/gains on debt securities available for sale, net of tax (305,769 ) Balance, December 31, 2022 (256,105 ) Changes in unrealized losses on debt securities available for sale, net of tax 65,823 Balance, December 31, 2023 $ (190,282 )

Note 17 - Earnings Per Common_2

Note 17 - Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands, except per share data) Net income (numerator) $ 161,768 $ 122,034 $ 86,509 Basic earnings per common share Weighted average number of common shares outstanding - basic (denominator) 26,703 26,895 26,855 Basic earnings per common share $ 6.06 $ 4.54 $ 3.22 Diluted earnings per common share Weighted average number of common shares outstanding - basic 26,703 26,895 26,855 Add common stock equivalents for options 3 12 15 Weighted average number of common shares outstanding - diluted (denominator) 26,706 26,907 26,870 Diluted earnings per common share $ 6.06 $ 4.54 $ 3.22

Note 18 - Westamerica Bancorp_2

Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Statements of Income and Comprehensive Income, Parent Only [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Dividends from subsidiaries $ 110,769 $ 70,267 $ 29,279 Interest income 57 49 44 Other income 11,935 11,386 11,608 Total income 122,761 81,702 40,931 Salaries and benefits 5,710 5,832 6,612 Other expense 2,315 2,609 2,279 Total expense 8,025 8,441 8,891 Income before taxes and equity in undistributed income of subsidiaries 114,736 73,261 32,040 Income tax expense (1,179 ) (881 ) (645 ) Earnings of subsidiaries greater than subsidiary dividends 48,211 49,654 55,114 Net income 161,768 122,034 86,509 Other comprehensive income (loss), net of tax 65,823 (305,769 ) (64,748 ) Comprehensive income (loss) $ 227,591 $ (183,735 ) $ 21,761
Balance Sheets Parent Only [Table Text Block]	At December 31, 2023 2022 (In thousands) Assets Cash $ 154,999 $ 99,478 Investment in Westamerica Bank 578,535 464,500 Investment in non-bank subsidiaries 451 453 Premises and equipment, net 9,123 9,411 Accounts receivable from Westamerica Bank 341 245 Other assets 45,694 44,831 Total assets $ 789,143 $ 618,918 Liabilities Accounts payable to Westamerica Bank $ 71 $ 40 Other liabilities 16,178 16,768 Total liabilities 16,249 16,808 Shareholders' equity 772,894 602,110 Total liabilities and shareholders' equity $ 789,143 $ 618,918
Statement of Cash Flows Parent Only [Table Text Block]	For the Years Ended December 31, 2023 2022 2021 (In thousands) Operating Activities Net income $ 161,768 $ 122,034 $ 86,509 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization 539 563 569 Decrease (increase) in accounts receivable from affiliates 1,224 (771 ) 117 Increase in other assets (2,048 ) (1,639 ) (1,223 ) Stock option compensation expense 1,356 1,309 1,419 Provision for deferred income tax 1,179 881 645 (Decrease) increase in other liabilities (1,326 ) (38 ) 254 Earnings of subsidiaries greater than subsidiary dividends (48,211 ) (49,654 ) (55,114 ) Net Cash Provided by Operating Activities 114,481 72,685 33,176 Investing Activities Purchases of equipment (209 ) (5 ) (78 ) Net Cash Used in Investing Activities (209 ) (5 ) (78 ) Financing Activities Exercise of stock options 950 2,255 3,017 Retirement of common stock (13,747 ) (218 ) (232 ) Common stock dividends paid (45,954 ) (45,182 ) (44,304 ) Net Cash Used in Financing Activities (58,751 ) (43,145 ) (41,519 ) Net change in cash and due from banks 55,521 29,535 (8,421 ) Cash and due from banks at beginning of period 99,478 69,943 78,364 Cash and due from banks at end of period $ 154,999 $ 99,478 $ 69,943 Supplemental Cash Flow Disclosures: Supplemental disclosure of cash flow activities: Income tax payments for the period $ 64,017 39,840 27,673

Note 19 - Quarterly Financial_2

Note 19 - Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2023
Notes Tables
Quarterly Financial Information [Table Text Block]	For the Three Months Ended March 31, June 30, September 30, December 31, (In thousands, except per share data and price range of common stock) 2023 Interest and loan fee income $ 69,624 $ 70,489 $ 72,848 $ 71,052 Net interest income 69,153 69,882 71,715 69,373 (Reversal of ) provision for loan losses (1,550 ) - 400 - Noninterest income 10,549 10,700 11,281 10,992 Noninterest expense 26,210 25,839 25,650 25,517 Income before taxes 55,042 54,743 56,946 54,848 Net income 40,451 40,248 41,601 39,468 Basic earnings per common share 1.51 1.51 1.56 1.48 Diluted earnings per common share 1.51 1.51 1.56 1.48 Dividends paid per common share 0.42 0.42 0.44 0.44 Price range, common stock 44.04 - 58.34 36.85 - 43.50 38.87 - 49.87 42.59 - 57.21 2022 Interest and loan fee income $ 43,759 $ 47,997 $ 60,802 $ 69,198 Net interest income 43,279 47,514 60,315 68,723 Provision for loan losses - - - - Noninterest income 11,576 11,264 11,818 10,463 Noninterest expense 24,875 24,629 24,767 25,090 Income before taxes 29,980 34,149 47,366 54,096 Net income 22,616 25,314 34,760 39,344 Basic earnings per common share 0.84 0.94 1.29 1.46 Diluted earnings per common share 0.84 0.94 1.29 1.46 Dividends paid per common share 0.42 0.42 0.42 0.42 Price range, common stock 57.54 - 62.76 55.66 - 61.30 52.29 - 61.52 52.22 - 63.39 2021 Interest and loan fee income $ 42,316 $ 44,276 $ 43,810 $ 43,041 Net interest income 41,841 43,792 43,318 42,537 Provision for loan losses - - - - Noninterest income 10,189 11,032 11,282 10,842 Noninterest expense 24,906 24,291 24,697 23,912 Income before taxes 27,124 30,533 29,903 29,467 Net income 20,147 22,579 22,063 21,720 Basic earnings per common share 0.75 0.84 0.82 0.81 Diluted earnings per common share 0.75 0.84 0.82 0.81 Dividends paid per common share 0.41 0.41 0.41 0.42 Price range, common stock 55.82 - 66.43 57.67 - 64.80 54.03 - 58.55 53.78 - 58.00

Note 1 - Business and Account_2

Note 1 - Business and Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Number of Reportable Segments	1
Equity Securities, FV-NI	$ 0	$ 0
Loans and Leases Receivable, Days Before Nonaccrual Status (Day)	90 days
Loans and Leases Receivable, Certain Consumer Loans and Auto Receivables, Days Before Chargeoff (Day)	120 days
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Land and Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years
Land and Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	50 years
Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	20 years

Note 2 - Investment Securitie_2

Note 2 - Investment Securities (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-Maturity, Allowance for Credit Loss	$ 1	$ 1	$ 7	$ 9
Debt Securities, Available-for-Sale and Held-to-Maturity, Before Allowance for Credit Loss	4,849,363	5,205,254
Asset Pledged as Collateral [Member] | Public Deposits and Short-term Borrowed Funds [Member]
Debt Securities, Available-for-Sale and Held-to-Maturity, Before Allowance for Credit Loss	$ 2,034,706	$ 1,180,010

Note 2 - Investment Securitie_3

Note 2 - Investment Securities - Amortized Cost, Unrealized Gains and Losses, and Estimated Fair Value of Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt securities available for sale, amortized cost	$ 4,269,948	$ 4,695,341
Debt securities available for sale, gross unrealized gains	1,360	1,625
Debt securities available for sale, gross unrealized losses	(271,507)	(365,223)
Debt securities available for sale	3,999,801	4,331,743
Held to maturity	878,397	915,914
Debt securities held to maturity, gross unrecognized gains	148	86
Debt securities held to maturity, gross unrecognized losses	(28,983)	(42,489)
Debt securities held to maturity, fair value	849,562	873,511
Debt securities, amortized cost	5,148,345	5,611,255
Debt securities, gross unrecognized gains	1,508	1,711
Debt securities, gross unrecognized losses	(300,490)	(407,712)
Total	4,849,363	5,205,254
Agency Residential MBS [Member]
Debt securities available for sale, amortized cost	258,150	311,089
Debt securities available for sale, gross unrealized gains	6	4
Debt securities available for sale, gross unrealized losses	(18,702)	(25,045)
Debt securities available for sale	239,454	286,048
Held to maturity	78,565	104,852
Debt securities held to maturity, gross unrecognized gains	17	13
Debt securities held to maturity, gross unrecognized losses	(5,270)	(7,503)
Debt securities held to maturity, fair value	73,312	97,362
US Government Agencies Debt Securities [Member]
Debt securities available for sale, amortized cost	308,768	306,336
Debt securities available for sale, gross unrealized gains	2	3
Debt securities available for sale, gross unrealized losses	(13,851)	(15,486)
Debt securities available for sale	294,919	290,853
US States and Political Subdivisions Debt Securities [Member]
Debt securities available for sale, amortized cost	72,679	84,024
Debt securities available for sale, gross unrealized gains	42	59
Debt securities available for sale, gross unrealized losses	(1,438)	(2,079)
Debt securities available for sale	71,283	82,004
Held to maturity	71,182	89,208
Debt securities held to maturity, gross unrecognized gains	47	73
Debt securities held to maturity, gross unrecognized losses	(335)	(538)
Debt securities held to maturity, fair value	70,894	88,743
Corporate Debt Securities [Member]
Debt securities available for sale, amortized cost	2,129,103	2,406,566
Debt securities available for sale, gross unrealized gains	480	1,032
Debt securities available for sale, gross unrealized losses	(220,035)	(307,643)
Debt securities available for sale	1,909,548	2,099,955
Held to maturity	728,650	721,854
Debt securities held to maturity, gross unrecognized gains	84	0
Debt securities held to maturity, gross unrecognized losses	(23,378)	(34,448)
Debt securities held to maturity, fair value	705,356	687,406
Collateralized Debt Obligations [Member]
Debt securities available for sale, amortized cost	1,501,248	1,587,326
Debt securities available for sale, gross unrealized gains	830	527
Debt securities available for sale, gross unrealized losses	(17,481)	(14,970)
Debt securities available for sale	$ 1,484,597	$ 1,572,883

Note 2 - Investment Securitie_4

Note 2 - Investment Securities - Amortized Cost and Estimated Market Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Investment securities available for sale, amortized cost, 1 year or less	$ 52,703	$ 251,578
Investment securities available for sale, fair value, 1 year or less	52,357	250,317
Investment securities held to maturity, amortized cost, 1 year or less	15,117	12,676
Investment securities held to maturity, fair value, 1 year or less	15,095	12,659
Investment securities available for sale, amortized cost, over 1 to 5 years	756,658	578,886
Investment securities available for sale, fair value, over 1 to 5 years	721,179	548,787
Investment securities held to maturity, amortized cost, over 1 to 5 years	312,847	161,653
Investment securities held to maturity, fair value, over 1 to 5 years	307,557	158,409
Investment securities available for sale, amortized cost, over 5 to 10 years	1,701,189	1,966,462
Investment securities available for sale, fair value, over 5 to 10 years	1,502,214	1,673,708
Investment securities held to maturity, amortized cost, over 5 to 10 years	471,868	636,733
Investment securities held to maturity, fair value, over 5 to 10 years	453,598	605,081
Investment securities available for sale, amortized cost, subtotal	2,510,550	2,796,926
Investment securities available for sale, fair value, subtotal	2,275,750	2,472,812
Investment securities held to maturity, amortized cost, subtotal	799,832	811,062
Investment securities held to maturity, fair value, subtotal	776,250	776,149
Investment securities available for sale, amortized cost	4,269,948	4,695,341
Investment securities available for sale, fair value	3,999,801	4,331,743
Investment securities held to maturity, amortized cost	878,397	915,914
Investment securities held to maturity, fair value	849,562	873,511
Collateralized Debt Obligations [Member]
Investment securities available for sale, amortized cost	1,501,248	1,587,326
Investment securities available for sale, fair value	1,484,597	1,572,883
Investment securities held to maturity, amortized cost	0	0
Investment securities held to maturity, fair value	0	0
Investment securities available for sale, amortized cost	1,501,248	1,587,326
Investment securities available for sale, fair value	1,484,597	1,572,883
Agency Residential MBS [Member]
Investment securities available for sale, amortized cost	258,150	311,089
Investment securities available for sale, fair value	239,454	286,048
Investment securities held to maturity, amortized cost	78,565	104,852
Investment securities held to maturity, fair value	73,312	97,362
Investment securities available for sale, amortized cost	258,150	311,089
Investment securities available for sale, fair value	239,454	286,048
Investment securities held to maturity, amortized cost	78,565	104,852
Investment securities held to maturity, fair value	$ 73,312	$ 97,362

Note 2 - Investment Securitie_5

Note 2 - Investment Securities - Gross Unrealized Losses, Investment Securities Portfolio (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Available for sale securities, less than 12 months, number of investment positions	39	376
Available for sale securities, less than 12 months, fair value	$ 440,504	$ 2,673,207
Available for sale securities, less than 12 months, unrealized losses	$ (8,946)	$ (225,835)
Available for sale securities, 12 months or longer, number of investment positions	394	93
Available for sale securities, 12 months or longer, fair value	$ 3,047,766	$ 757,794
Available for sale securities, 12 months or longer, unrealized losses	$ (262,561)	$ (139,388)
Available for sale securities, total, number of investment positions	433	469
Available for sale securities, total, fair value	$ 3,488,270	$ 3,431,001
Available for sale securities, total, unrealized losses	$ (271,507)	$ (365,223)
Held to Maturity securities, less than 12 months, number of investment positions	27	200
Held to Maturity securities, less than 12 months, fair value	$ 45,166	$ 821,756
Held to Maturity securities, less than 12 months, unrecognized losses	$ (1,274)	$ (42,390)
Held to Maturity securities, 12 months or longer, number of investment positions	165	2
Held to Maturity securities, 12 months or longer, fair value	$ 739,440	$ 682
Held to Maturity securities, 12 months or longer, unrecognized losses	$ (27,709)	$ (99)
Held to Maturity securities, total, number of investment positions	192	202
Held to Maturity securities, total, fair value	$ 784,606	$ 822,438
Held to Maturity securities, total, unrecognized losses	$ (28,983)	$ (42,489)
Agency Residential MBS [Member]
Available for sale securities, less than 12 months, number of investment positions	1	107
Available for sale securities, less than 12 months, fair value	$ 115	$ 279,139
Available for sale securities, less than 12 months, unrealized losses	$ (2)	$ (24,222)
Available for sale securities, 12 months or longer, number of investment positions	107	9
Available for sale securities, 12 months or longer, fair value	$ 238,642	$ 6,110
Available for sale securities, 12 months or longer, unrealized losses	$ (18,700)	$ (823)
Available for sale securities, total, number of investment positions	108	116
Available for sale securities, total, fair value	$ 238,757	$ 285,249
Available for sale securities, total, unrealized losses	$ (18,702)	$ (25,045)
Held to Maturity securities, less than 12 months, number of investment positions	1	97
Held to Maturity securities, less than 12 months, fair value	$ 0	$ 95,814
Held to Maturity securities, less than 12 months, unrecognized losses	$ 0	$ (7,404)
Held to Maturity securities, 12 months or longer, number of investment positions	93	2
Held to Maturity securities, 12 months or longer, fair value	$ 72,376	$ 682
Held to Maturity securities, 12 months or longer, unrecognized losses	$ (5,270)	$ (99)
Held to Maturity securities, total, number of investment positions	94	99
Held to Maturity securities, total, fair value	$ 72,376	$ 96,496
Held to Maturity securities, total, unrecognized losses	$ (5,270)	$ (7,503)
US Government Agencies Debt Securities [Member]
Available for sale securities, less than 12 months, number of investment positions	2	22
Available for sale securities, less than 12 months, fair value	$ 9,746	$ 289,067
Available for sale securities, less than 12 months, unrealized losses	$ (15)	$ (15,486)
Available for sale securities, 12 months or longer, number of investment positions	19	0
Available for sale securities, 12 months or longer, fair value	$ 278,265	$ 0
Available for sale securities, 12 months or longer, unrealized losses	$ (13,836)	$ 0
Available for sale securities, total, number of investment positions	21	22
Available for sale securities, total, fair value	$ 288,011	$ 289,067
Available for sale securities, total, unrealized losses	$ (13,851)	$ (15,486)
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities, less than 12 months, number of investment positions	2	56
Available for sale securities, less than 12 months, fair value	$ 2,280	$ 65,633
Available for sale securities, less than 12 months, unrealized losses	$ (15)	$ (1,902)
Available for sale securities, 12 months or longer, number of investment positions	50	8
Available for sale securities, 12 months or longer, fair value	$ 57,614	$ 3,265
Available for sale securities, 12 months or longer, unrealized losses	$ (1,423)	$ (177)
Available for sale securities, total, number of investment positions	52	64
Available for sale securities, total, fair value	$ 59,894	$ 68,898
Available for sale securities, total, unrealized losses	$ (1,438)	$ (2,079)
Held to Maturity securities, less than 12 months, number of investment positions	23	54
Held to Maturity securities, less than 12 months, fair value	$ 18,599	$ 53,536
Held to Maturity securities, less than 12 months, unrecognized losses	$ (90)	$ (538)
Held to Maturity securities, 12 months or longer, number of investment positions	26	0
Held to Maturity securities, 12 months or longer, fair value	$ 25,466	$ 0
Held to Maturity securities, 12 months or longer, unrecognized losses	$ (245)	$ 0
Held to Maturity securities, total, number of investment positions	49	54
Held to Maturity securities, total, fair value	$ 44,065	$ 53,536
Held to Maturity securities, total, unrecognized losses	$ (335)	$ (538)
Corporate Debt Securities [Member]
Available for sale securities, less than 12 months, number of investment positions	0	133
Available for sale securities, less than 12 months, fair value	$ 0	$ 1,521,294
Available for sale securities, less than 12 months, unrealized losses	$ 0	$ (170,453)
Available for sale securities, 12 months or longer, number of investment positions	151	56
Available for sale securities, 12 months or longer, fair value	$ 1,894,602	$ 555,727
Available for sale securities, 12 months or longer, unrealized losses	$ (220,035)	$ (137,190)
Available for sale securities, total, number of investment positions	151	189
Available for sale securities, total, fair value	$ 1,894,602	$ 2,077,021
Available for sale securities, total, unrealized losses	$ (220,035)	$ (307,643)
Held to Maturity securities, less than 12 months, number of investment positions	3	49
Held to Maturity securities, less than 12 months, fair value	$ 26,567	$ 672,406
Held to Maturity securities, less than 12 months, unrecognized losses	$ (1,184)	$ (34,448)
Held to Maturity securities, 12 months or longer, number of investment positions	46	0
Held to Maturity securities, 12 months or longer, fair value	$ 641,598	$ 0
Held to Maturity securities, 12 months or longer, unrecognized losses	$ (22,194)	$ 0
Held to Maturity securities, total, number of investment positions	49	49
Held to Maturity securities, total, fair value	$ 668,165	$ 672,406
Held to Maturity securities, total, unrecognized losses	$ (23,378)	$ (34,448)
Collateralized Debt Obligations [Member]
Available for sale securities, less than 12 months, number of investment positions	34	58
Available for sale securities, less than 12 months, fair value	$ 428,363	$ 518,074
Available for sale securities, less than 12 months, unrealized losses	$ (8,914)	$ (13,772)
Available for sale securities, 12 months or longer, number of investment positions	67	20
Available for sale securities, 12 months or longer, fair value	$ 578,643	$ 192,692
Available for sale securities, 12 months or longer, unrealized losses	$ (8,567)	$ (1,198)
Available for sale securities, total, number of investment positions	101	78
Available for sale securities, total, fair value	$ 1,007,006	$ 710,766
Available for sale securities, total, unrealized losses	$ (17,481)	$ (14,970)

Note 2 - Investment Securitie_6

Note 2 - Investment Securities - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Beginning balance	$ 1	$ 7	$ 9
Reversal of provision for credit losses	0	(6)	(2)
Chargeoffs	0	0	0
Recoveries	0	0	0
Ending balance	$ 1	$ 1	$ 7

Note 2 - Investment Securitie_7

Note 2 - Investment Securities - Credit Quality (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Held to maturity	$ 878,397	$ 915,914
AAA/AA/A [Member]
Held to maturity	655,602
BBB + [Member]
Held to maturity	222,142
B- [Member]
Held to maturity	653
NR [Member]
Held to maturity	878,397
Agency Residential MBS [Member]
Held to maturity	78,565	104,852
Agency Residential MBS [Member] | AAA/AA/A [Member]
Held to maturity	78,092
Agency Residential MBS [Member] | BBB + [Member]
Held to maturity	0
Agency Residential MBS [Member] | B- [Member]
Held to maturity	473
Agency Residential MBS [Member] | NR [Member]
Held to maturity	78,565
US States and Political Subdivisions Debt Securities [Member]
Held to maturity	71,182	89,208
US States and Political Subdivisions Debt Securities [Member] | AAA/AA/A [Member]
Held to maturity	71,002
US States and Political Subdivisions Debt Securities [Member] | BBB + [Member]
Held to maturity	0
US States and Political Subdivisions Debt Securities [Member] | B- [Member]
Held to maturity	180
US States and Political Subdivisions Debt Securities [Member] | NR [Member]
Held to maturity	71,182
Corporate Debt Securities [Member]
Held to maturity	728,650	$ 721,854
Corporate Debt Securities [Member] | AAA/AA/A [Member]
Held to maturity	506,508
Corporate Debt Securities [Member] | BBB + [Member]
Held to maturity	222,142
Corporate Debt Securities [Member] | B- [Member]
Held to maturity	0
Corporate Debt Securities [Member] | NR [Member]
Held to maturity	$ 728,650

Note 2 - Investment Securitie_8

Note 2 - Investment Securities - Interest Income From Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Taxable	$ 221,742	$ 158,465	$ 106,329
Tax-exempt from regular federal income tax	4,484	5,819	8,424
Total interest income from investment securities	$ 226,226	$ 164,284	$ 114,753

Note 3 - Loans and Allowance _3

Note 3 - Loans and Allowance for Credit Losses (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss	$ 16,867	$ 20,284	$ 23,514	$ 23,854
Loans and Leases Receivable, Nonaccrual, Commitment to Lend	0	0
Financing Receivable, Modified in Period, Amount	0	0
Financing Receivable, Held-for-Sale	0	0
Other Real Estate	0	0
Mortgage Loans in Process of Foreclosure, Amount	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss	$ 5,925	$ 5,888	6,529	5,660
Number of Collateral-dependent Loans	9	5
Collateral-dependent Loans, Balance	$ 10,900	$ 8,100
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Loss	6,455	8,076	$ 9,972	$ 8,936
Collateral-dependent Loans, Balance	377	625
Nonperforming Financial Instruments [Member]
Financing Receivable, Allowance for Credit Loss	$ 0	$ 0

Note 3 - Loans and Allowance _4

Note 3 - Loans and Allowance for Credit Losses - Loans Receivable at Carrying Amount (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans	$ 866,602	$ 958,488
Commercial Portfolio Segment [Member]
Loans	136,550	169,617
Commercial Real Estate Portfolio Segment [Member]
Loans	487,523	491,107
Construction Portfolio Segment [Member]
Loans	5,063	3,088
Residential Portfolio Segment [Member]
Loans	9,935	13,834
Consumer Portfolio Segment [Member]
Loans	$ 227,531	$ 280,842

Note 3 - Loans and Allowance _5

Note 3 - Loans and Allowance for Credit Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance at beginning of period	$ 20,284	$ 23,514	$ 23,854
(Reversal) provision	(1,150)	6	2
Chargeoffs	(7,954)	(6,225)	(3,248)
Recoveries	5,687	2,989	2,906
Total allowance for credit losses	16,867	20,284	23,514
Commercial Portfolio Segment [Member]
Balance at beginning of period	6,138	6,966	9,205
(Reversal) provision	(3,871)	(1,184)	(2,411)
Chargeoffs	(410)	(20)	(56)
Recoveries	2,359	376	228
Total allowance for credit losses	4,216	6,138	6,966
Commercial Real Estate Portfolio Segment [Member]
Balance at beginning of period	5,888	6,529	5,660
(Reversal) provision	11	(703)	126
Chargeoffs	(45)		0
Recoveries	71	62	743
Total allowance for credit losses	5,925	5,888	6,529
Construction Portfolio Segment [Member]
Balance at beginning of period	150	2	6
(Reversal) provision	95	148	(4)
Chargeoffs	0		0
Recoveries	0		0
Total allowance for credit losses	245	150	2
Residential Portfolio Segment [Member]
Balance at beginning of period	32	45	47
(Reversal) provision	(6)	(13)	(2)
Chargeoffs	0		0
Recoveries	0		0
Total allowance for credit losses	26	32	45
Consumer Portfolio Segment [Member]
Balance at beginning of period	8,076	9,972	8,936
(Reversal) provision	2,621	1,758	2,293
Chargeoffs	(7,499)	(6,205)	(3,192)
Recoveries	3,257	2,551	1,935
Total allowance for credit losses	$ 6,455	$ 8,076	$ 9,972

Note 3 - Loans and Allowance _6

Note 3 - Loans and Allowance for Credit Losses - Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans	$ 866,602	$ 958,488
Pass [Member]
Loans	845,629	941,650
Substandard [Member]
Loans	18,908	15,298
Doubtful [Member]
Loans	1,479	752
Unlikely to be Collected Financing Receivable [Member]
Loans	586	788
Commercial Portfolio Segment [Member]
Loans	136,550	169,617
Commercial Portfolio Segment [Member] | Pass [Member]
Loans	130,001	169,040
Commercial Portfolio Segment [Member] | Substandard [Member]
Loans	6,549	577
Commercial Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	487,523	491,107
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	475,870	477,842
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	11,653	13,265
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Construction Portfolio Segment [Member]
Loans	5,063	3,088
Construction Portfolio Segment [Member] | Pass [Member]
Loans	5,063	3,088
Construction Portfolio Segment [Member] | Substandard [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Loans	9,935	13,834
Residential Portfolio Segment [Member] | Pass [Member]
Loans	9,606	13,457
Residential Portfolio Segment [Member] | Substandard [Member]
Loans	329	377
Residential Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	227,531	280,842
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	225,089	278,223
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans	377	1,079
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans	1,479	752
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	$ 586	$ 788

Note 3 - Loans and Allowance _7

Note 3 - Loans and Allowance for Credit Losses - Loans by Delinquency and Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total loans	$ 866,602	$ 958,488
Nonaccrual	403	146
Financial Asset, Not Past Due [Member]
Total loans	857,250	949,456
Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	6,553	6,158
Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	2,008	2,100
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	388	628
Commercial Portfolio Segment [Member]
Total loans	136,550	169,617
Nonaccrual	71	50
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	136,421	169,337
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	58	172
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	58
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Total loans	487,523	491,107
Nonaccrual	330	53
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	485,476	490,354
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	951	508
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	766	192
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member]
Total loans	5,063	3,088
Nonaccrual	0	0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	5,063	3,088
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Residential Portfolio Segment [Member]
Total loans	9,935	13,834
Nonaccrual	2	27
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	9,933	13,430
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	0	377
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	0	0
Consumer Portfolio Segment [Member]
Total loans	227,531	280,842
Nonaccrual	0	16
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Total loans	220,357	273,247
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Total loans	5,544	5,101
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Total loans	1,242	1,850
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Total loans	$ 388	$ 628

Note 3 - Loans and Allowance _8

Note 3 - Loans and Allowance for Credit Losses - Risk Category of Loans by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans	$ 866,602	$ 958,488
Loans, write off	7,954	6,225	$ 3,248
Nonaccrual	403	146
Financial Asset, Not Past Due [Member]
Loans	857,250	949,456
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	6,553	6,158
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	2,008	2,100
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	388	628
Commercial Portfolio Segment [Member]
Originated prior	20,566	23,903
Originated four years before	6,963	5,549
Originated three years before	12,601	12,557
Originated two years before	34,605	17,293
Originated one years before	22,146	53,928
Originated current year	13,112	23,966
Total Term Loans	109,993	137,196
Revolving Loans Amortized Cost Basis	26,557	32,421
Loans	136,550	169,617
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	3
Originated two years before, writeoffs	135
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	138
Revolving Loans Amortized Cost Basis, write off	272
Loans, write off	410	20	56
Nonaccrual	71	50
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	136,421	169,337
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	58	172
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	58
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	5,063	3,088
Loans	5,063	3,088
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	0
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	0		0
Nonaccrual	0	0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	5,063	3,088
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Originated prior	182,981	154,671
Originated four years before	68,967	58,473
Originated three years before	70,110	73,552
Originated two years before	68,891	74,822
Originated one years before	50,899	71,618
Originated current year	45,675	57,971
Total Term Loans	487,523	491,107
Revolving Loans Amortized Cost Basis	0	0
Loans	487,523	491,107
Originated prior, writeoff	45
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	45
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	45		0
Nonaccrual	330	53
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	485,476	490,354
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	951	508
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	766	192
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Originated prior	9,935	13,834
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	9,935	13,834
Revolving Loans Amortized Cost Basis	0	0
Loans	9,935	13,834
Originated prior, writeoff	0
Originated four years before, writeoffs	0
Originated three years before, writeoffs	0
Originated two years before, writeoffs	0
Originated one years before, writeoffs	0
Originated current year, witeoffs	0
Total Term Loans, write off	0
Revolving Loans Amortized Cost Basis, write off	0
Loans, write off	0		0
Nonaccrual	2	27
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	9,933	13,430
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0	377
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0	0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Originated prior	6,736
Originated four years before	12,480
Originated three years before	23,541
Originated two years before	53,953
Originated one years before	73,689
Originated current year	39,153
Revolving Loans Amortized Cost Basis	17,979
Loans	227,531	280,842
Originated prior, writeoff	246
Originated four years before, writeoffs	161
Originated three years before, writeoffs	843
Originated two years before, writeoffs	2,329
Originated one years before, writeoffs	3,191
Originated current year, witeoffs	453
Total Term Loans, write off	7,223
Revolving Loans Amortized Cost Basis, write off	276
Loans, write off	7,499	6,205	$ 3,192
Financing Receivable, Term Loan	209,552
Nonaccrual	0	16
Consumer Portfolio Segment [Member] | Term Loan Originated Prior [Member]
Loans		6,179
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Term Loans Originated in 2018 [Member]
Loans		13,500
Nonaccrual		0
Consumer Portfolio Segment [Member] | Term Loans Originated in 2019 [Member]
Loans		22,985
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Term Loans Originated in 2020 [Member]
Loans		37,133
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Term Loans Originated in 2021 [Member]
Loans		78,754
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Term Loans Originated in 2022 [Member]
Loans		101,764
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Total Term Loans [Member]
Loans		260,315
Nonaccrual	0	0
Consumer Portfolio Segment [Member] | Revolving Loans Amortized Cost Basis [Member]
Loans		20,527
Nonaccrual	0	16
Consumer Portfolio Segment [Member] | Term Loans Originated in 2023 [Member]
Nonaccrual	0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Originated prior	6,545
Originated four years before	12,144
Originated three years before	22,700
Originated two years before	51,055
Originated one years before	71,388
Originated current year	38,699
Revolving Loans Amortized Cost Basis	17,826
Loans	220,357	273,247
Financing Receivable, Term Loan	202,531
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loan Originated Prior [Member]
Loans		6,017
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loans Originated in 2018 [Member]
Loans		13,147
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loans Originated in 2019 [Member]
Loans		22,330
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loans Originated in 2020 [Member]
Loans		35,783
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loans Originated in 2021 [Member]
Loans		76,126
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Term Loans Originated in 2022 [Member]
Loans		99,414
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Total Term Loans [Member]
Loans		252,817
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] | Revolving Loans Amortized Cost Basis [Member]
Loans		20,430
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Originated prior	160
Originated four years before	277
Originated three years before	600
Originated two years before	2,345
Originated one years before	1,733
Originated current year	332
Revolving Loans Amortized Cost Basis	97
Loans	5,544	5,101
Financing Receivable, Term Loan	5,447
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loan Originated Prior [Member]
Loans		117
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loans Originated in 2018 [Member]
Loans		268
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loans Originated in 2019 [Member]
Loans		572
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loans Originated in 2020 [Member]
Loans		1,014
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loans Originated in 2021 [Member]
Loans		1,709
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Term Loans Originated in 2022 [Member]
Loans		1,359
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Total Term Loans [Member]
Loans		5,039
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Revolving Loans Amortized Cost Basis [Member]
Loans		62
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Originated prior	31
Originated four years before	51
Originated three years before	153
Originated two years before	410
Originated one years before	430
Originated current year	122
Revolving Loans Amortized Cost Basis	45
Loans	1,242	1,850
Financing Receivable, Term Loan	1,197
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loan Originated Prior [Member]
Loans		42
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loans Originated in 2018 [Member]
Loans		65
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loans Originated in 2019 [Member]
Loans		67
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loans Originated in 2020 [Member]
Loans		275
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loans Originated in 2021 [Member]
Loans		635
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Term Loans Originated in 2022 [Member]
Loans		750
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Total Term Loans [Member]
Loans		1,834
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Revolving Loans Amortized Cost Basis [Member]
Loans		16
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Originated prior	0
Originated four years before	8
Originated three years before	88
Originated two years before	143
Originated one years before	138
Originated current year	0
Revolving Loans Amortized Cost Basis	11
Loans	388	628
Financing Receivable, Term Loan	377
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loan Originated Prior [Member]
Loans		3
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loans Originated in 2018 [Member]
Loans		20
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loans Originated in 2019 [Member]
Loans		16
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loans Originated in 2020 [Member]
Loans		61
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loans Originated in 2021 [Member]
Loans		284
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Term Loans Originated in 2022 [Member]
Loans		241
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Total Term Loans [Member]
Loans		625
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Revolving Loans Amortized Cost Basis [Member]
Loans		3
Pass [Member]
Loans	845,629	941,650
Pass [Member] | Commercial Portfolio Segment [Member]
Originated prior	20,554	23,891
Originated four years before	4,471	5,549
Originated three years before	12,601	12,557
Originated two years before	31,770	17,293
Originated one years before	22,146	53,928
Originated current year	13,112	23,966
Total Term Loans	104,654	137,184
Revolving Loans Amortized Cost Basis	25,347	31,856
Loans	130,001	169,040
Pass [Member] | Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	5,063	3,088
Loans	5,063	3,088
Pass [Member] | Commercial Real Estate Portfolio Segment [Member]
Originated prior	172,925	146,588
Originated four years before	68,156	58,473
Originated three years before	69,324	71,440
Originated two years before	68,891	74,016
Originated one years before	50,899	71,618
Originated current year	45,675	55,707
Total Term Loans	475,870	477,842
Revolving Loans Amortized Cost Basis	0	0
Loans	475,870	477,842
Pass [Member] | Residential Portfolio Segment [Member]
Originated prior	9,606	13,457
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	9,606	13,457
Revolving Loans Amortized Cost Basis	0	0
Loans	9,606	13,457
Pass [Member] | Consumer Portfolio Segment [Member]
Loans	225,089	278,223
Substandard [Member]
Loans	18,908	15,298
Substandard [Member] | Commercial Portfolio Segment [Member]
Originated prior	12	12
Originated four years before	2,492	0
Originated three years before	0	0
Originated two years before	2,835	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	5,339	12
Revolving Loans Amortized Cost Basis	1,210	565
Loans	6,549	577
Substandard [Member] | Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Originated prior	10,056	8,083
Originated four years before	811	0
Originated three years before	786	2,112
Originated two years before	0	806
Originated one years before	0	0
Originated current year	0	2,264
Total Term Loans	11,653	13,265
Revolving Loans Amortized Cost Basis	0	0
Loans	11,653	13,265
Substandard [Member] | Residential Portfolio Segment [Member]
Originated prior	329	377
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	329	377
Revolving Loans Amortized Cost Basis	0	0
Loans	329	377
Substandard [Member] | Consumer Portfolio Segment [Member]
Loans	377	1,079
Doubtful [Member]
Loans	1,479	752
Doubtful [Member] | Commercial Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] | Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] | Residential Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Loans	1,479	752
Unlikely to be Collected Financing Receivable [Member]
Loans	586	788
Unlikely to be Collected Financing Receivable [Member] | Commercial Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] | Construction Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] | Commercial Real Estate Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] | Residential Portfolio Segment [Member]
Originated prior	0	0
Originated four years before	0	0
Originated three years before	0	0
Originated two years before	0	0
Originated one years before	0	0
Originated current year	0	0
Total Term Loans	0	0
Revolving Loans Amortized Cost Basis	0	0
Loans	0	0
Unlikely to be Collected Financing Receivable [Member] | Consumer Portfolio Segment [Member]
Loans	$ 586	$ 788

Note 4 - Concentration of Cre_2

Note 4 - Concentration of Credit Risk (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Unsecured Loan Limit, Percentage of Shareholders' Equity, California Financial Code	15%
Secured and Unsecured Loan Limit Percentage, California Financial Code	25%
Loan Commitments Related to Real Estate Loans	$ 30,888	$ 34,790
Corporate Debt Securities [Member]
Concentration Risk, Issuer Relationships	107
Concentration Risk, Aggregate Securities Amount	$ 5,000
Commercial Real Estate Loans [Member]
Loan To Value Ratio Requirement	75%
Residential Real Estate Loans [Member]
Loan To Value Ratio Requirement	80%
Aggregate Loans [Member] | Customer Concentration Risk [Member]
Concentration Risk, Issuer Relationships	25
Aggregate Loans [Member] | Customer Concentration Risk [Member] | Minimum [Member]
Concentration Risk, Aggregate Loans Amount	$ 5,000

Note 5 - Premises, Equipment,_3

Note 5 - Premises, Equipment, Other Assets and Other Liabilities (Details Textual) $ / shares in Units, shares in Thousands, $ in Thousands			12 Months Ended
	Sep. 28, 2023	Jun. 29, 2023	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 29, 2023 $ / shares
Depreciation, Depletion and Amortization, Nonproduction			$ 2,942	$ 2,899	$ 2,978
Share Price (in dollars per share) | $ / shares			$ 56.41
LIHTC Investments			$ 28,667	34,421
Qualified Affordable Housing Project Investments, Commitment			$ 15,561	22,647
Lessee, Operating Lease, Term of Contract (Year)			5 years
Lessee, Operating Lease, Renewal Term (Year)			5 years
Operating Lease, Liability			$ 18,814	15,746
Operating Lease, Weighted Average Remaining Lease Term (Year)			3 years 8 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent			2.94%
Operating Lease, Right-of-Use Asset			$ 18,814	15,746
Occupancy and Equipment Expense [Member]
Operating Lease, Cost			6,604	$ 6,575	$ 6,581
Contingent Commitment, Year 1 [Member]
Qualified Affordable Housing Project Investments, Commitment			14,077
Contingent Commitment, Year 2 [Member]
Qualified Affordable Housing Project Investments, Commitment			600
Contingent Commitment, Year 3 [Member]
Qualified Affordable Housing Project Investments, Commitment			145
Contingent Commitment, Year 4 [Member]
Qualified Affordable Housing Project Investments, Commitment			189
Contingent Commitment, Thereafter [Member]
Qualified Affordable Housing Project Investments, Commitment			$ 550
Visa Inc. [Member]
Investment Owned, Balance, Shares (in shares) | shares			211
Conversion Rate of Class B Common Stock into Class A Common Stock	1.5875	1.5902
Share Price (in dollars per share) | $ / shares						$ 260.35
Visa Inc. [Member] | Reported Value Measurement [Member]
Investment Owned, at Fair Value			$ 0

Note 5 - Premises, Equipment,_4

Note 5 - Premises, Equipment, Other Assets and Other Liabilities - Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cost	$ 88,846	$ 88,904
Accumulated Depreciation and Amortization	(61,830)	(60,085)
Net Book Value	27,016	28,819
Land [Member]
Cost	11,453	11,453
Accumulated Depreciation and Amortization	0	0
Net Book Value	11,453	11,453
Building and Building Improvements [Member]
Cost	43,185	42,528
Accumulated Depreciation and Amortization	(31,742)	(30,601)
Net Book Value	11,443	11,927
Leasehold Improvements [Member]
Cost	7,622	8,157
Accumulated Depreciation and Amortization	(6,550)	(6,897)
Net Book Value	1,072	1,260
Furniture and Fixtures [Member]
Cost	26,586	26,766
Accumulated Depreciation and Amortization	(23,538)	(22,587)
Net Book Value	$ 3,048	$ 4,179

Note 5 - Premises, Equipment,_5

Note 5 - Premises, Equipment, Other Assets and Other Liabilities - Other Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Cost method equity investments:
Federal Reserve Bank stock (1)	[1]	$ 14,069	$ 11,743
Other investments		158	158
Total cost method equity investments		14,227	11,901
Life insurance cash surrender value		66,611	63,816
Net deferred tax asset		99,507	125,140
Right-of-use asset		18,814	15,746
Limited partnership investments		28,667	34,421
Interest receivable		54,568	53,558
Prepaid assets		5,200	4,894
Other assets		9,716	9,670
Total other assets		$ 297,310	$ 319,146
[1]A bank applying for membership in the Federal Reserve System is required to subscribe to stock in the Federal Reserve Bank (FRB) in its district in a sum equal to six percent of the bank’s paid-up capital stock and surplus. One-half of the amount of the bank's subscription shall be paid to the FRB and the remaining half will be subject to call when deemed necessary by the Board of Governors of the Federal Reserve System.

Note 5 - Premises, Equipment,_6

Note 5 - Premises, Equipment, Other Assets and Other Liabilities - Amounts Recognized in Net Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Limited partnership operating losses	$ 5,754	$ 5,724	$ 2,620
Tax credits recognized in provision for income taxes	$ 3,435	$ 3,250	$ 2,300

Note 5 - Premises, Equipment,_7

Note 5 - Premises, Equipment, Other Assets and Other Liabilities - Summary of Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Operating lease liability	$ 18,814	$ 15,746
Other liabilities	40,455	49,379
Total other liabilities	$ 59,269	$ 65,125

Note 5 - Premises, Equipment,_8

Note 5 - Premises, Equipment, Other Assets and Other Liabilities - Summarizes of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
2024	$ 6,067
2025	5,178
2026	3,518
2027	2,621
2028	1,865
Thereafter	818
Total minimum lease payments, operating lease	20,067
Less: discount, operating lease	(1,253)
Operating lease liability	18,814	$ 15,746
Other Liabilities [Member]
Operating lease liability	$ 18,814

Note 6 - Goodwill and Identif_3

Note 6 - Goodwill and Identifiable Intangible Assets (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill and Intangible Asset Impairment	$ 0	$ 0
Amortization Expense, Adjustment Resulting from a Change in Estimates of Useful Lives or Residual Values	$ 0	$ 0

Note 6 - Goodwill and Identif_4

Note 6 - Goodwill and Identifiable Intangible Assets - Carrying Values of Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Goodwill	$ 121,673	$ 121,673

Note 6 - Goodwill and Identif_5

Note 6 - Goodwill and Identifiable Intangible Assets - Gross Carrying Amount of Intangible Assets and Accumulated Amortization (Details) - Core Deposits [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Gross Carrying Amount	$ 56,808	$ 56,808
Accumulated Amortization	$ (56,461)	$ (56,225)

Note 6 - Goodwill and Identif_6

Note 6 - Goodwill and Identifiable Intangible Assets - Estimated Future Amortization Expense for Identifiable Intangible Assets (Details) - Core Deposits [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
For the year ended December 31, 2023 (actual)	$ 236
2024	222
2025	$ 125

Note 7 - Deposits and Borrowe_3

Note 7 - Deposits and Borrowed Funds (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Demand Deposit Overdrafts	$ 620	$ 995
Interest Expense, Time Deposits, $100,000 or More	116	$ 156	$ 265
Corresponding Banks [Member]
Line of Credit Facility, Maximum Borrowing Capacity	100,000
Proceeds from Lines of Credit	0
Line of Credit Facility, Average Outstanding Amount	0
Federal Reserve [Member]
Line of Credit Facility, Maximum Borrowing Capacity	996,935
Federal Reserve [Member] | Assets Available To Be Pledged As Collateral [Member]
Available for Sale and Held to Maturity Debt Securities	$ 1,945,176

Note 7 - Deposits and Borrowe_4

Note 7 - Deposits and Borrowed Funds - Deposits Detail (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Noninterest-bearing	$ 2,605,844	$ 2,947,277
Transaction	1,072,233	1,273,143
Savings	1,699,388	1,874,115
Time deposits less than $100 thousand	56,100	65,962
Time deposits $100 thousand through $250 thousand	31,107	42,733
Time deposits more than $250 thousand	9,595	22,060
Total deposits	$ 5,474,267	$ 6,225,290

Note 7 - Deposits and Borrowe_5

Note 7 - Deposits and Borrowed Funds - Short-term Borrowed Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Collateral Carrying Value	$ 259,616	$ 233,882
Short-term borrowed funds	58,162	57,792
Agency Residential MBS [Member]
Collateral Carrying Value	25,669	30,108
Corporate Debt Securities [Member]
Collateral Carrying Value	$ 233,947	$ 203,774

Note 7 - Deposits and Borrowe_6

Note 7 - Deposits and Borrowed Funds - Borrowed Funds, Highest Month End Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Securities Sold under Agreements to Repurchase [Member]
Securities sold under repurchase agreements	$ 138,005	$ 257,560

Note 8 - Shareholders' Equity_2

Note 8 - Shareholders' Equity (Details Textual) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares
Share Price (in dollars per share) | $ / shares	$ 56.41
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)	225,000	229,000	193,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) | $ / shares	$ 8.5	$ 7.9	$ 7.5
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $	$ 1,581
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value | $	113	$ 165	$ 454
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value | $	$ 1,309	$ 1,464	$ 1,783
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)	22,000	40,000	53,000
Excess Tax Deduction Exceeding Related Share-based Compensation, Operating Activities | $	$ 16	$ 143
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount | $	$ 5	$ 30
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	12,000	12,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)	0
Additional Classes of Stock Authorized	2
Additional Classes of Stock Authorized, Shares Authorized, Per Class (in shares)	1,000,000
Common Stock, Shares Authorized (in shares)	150,000,000	150,000,000
Common Stock, Shares, Outstanding, Ending Balance (in shares)	26,671,000	26,913,000
Common Class B [Member]
Common Stock, Shares, Outstanding, Ending Balance (in shares)	0
NQSO [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Restricted Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $	$ 508	$ 492	$ 527
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms (Year)		1 year 2 months 12 days
Share-Based Payment Arrangement, Expense | $	$ 250	$ 525	$ 610
Share-Based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	705
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 8 months 12 days
Stock Appreciation Rights (SARs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	0	0	0

Note 8 - Shareholders' Equity -

Note 8 - Shareholders' Equity - Information About Stock Options Granted (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) $ / shares shares
Options outstanding, range of exercise price, lower range (in dollars per share)	$ 40
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 70
Options outstanding, number outstanding (in shares) | shares	973
Options outstanding, aggregate intrinsic value | $	$ 157
Options outstanding, weighted average remaining contractual life (Year)	6 years 6 months
Options outstanding, weighted average exercise price (in dollars per share)	$ 60
Options exercisable, number outstanding (in shares) | shares	614
Options exercisable, aggregate intrinsic value | $	$ 157
Options exercisable, weighted average remaining contractual life (Year)	5 years 4 months 24 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 61
Range 1 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	40
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 45
Options outstanding, number outstanding (in shares) | shares	12
Options outstanding, aggregate intrinsic value | $	$ 149
Options outstanding, weighted average remaining contractual life (Year)	1 year 10 months 24 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 42
Options exercisable, number outstanding (in shares) | shares	12
Options exercisable, aggregate intrinsic value | $	$ 149
Options exercisable, weighted average remaining contractual life (Year)	1 year 10 months 24 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 42
Range 2 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	45
Options outstanding, range of exercise price, upper range (in dollars per share)	50
Range 3 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	50
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 55
Options outstanding, number outstanding (in shares) | shares	4
Options outstanding, aggregate intrinsic value | $	$ 8
Options outstanding, weighted average remaining contractual life (Year)	1 month 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 53
Options exercisable, number outstanding (in shares) | shares	4
Options exercisable, aggregate intrinsic value | $	$ 8
Options exercisable, weighted average remaining contractual life (Year)	1 month 6 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 53
Range 4 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	55
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 60
Options outstanding, number outstanding (in shares) | shares	572
Options outstanding, aggregate intrinsic value | $	$ 0
Options outstanding, weighted average remaining contractual life (Year)	7 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 57
Options exercisable, number outstanding (in shares) | shares	213
Options exercisable, aggregate intrinsic value | $	$ 0
Options exercisable, weighted average remaining contractual life (Year)	6 years 1 month 6 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 58
Range 5 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	60
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 65
Options outstanding, number outstanding (in shares) | shares	247
Options outstanding, weighted average remaining contractual life (Year)	4 years 7 months 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 62
Options exercisable, number outstanding (in shares) | shares	247
Options exercisable, weighted average remaining contractual life (Year)	4 years 7 months 6 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 62
Range 6 [Member]
Options outstanding, range of exercise price, lower range (in dollars per share)	65
Options outstanding, range of exercise price, upper range (in dollars per share)	$ 70
Options outstanding, number outstanding (in shares) | shares	138
Options outstanding, weighted average remaining contractual life (Year)	6 years 1 month 6 days
Options outstanding, weighted average exercise price (in dollars per share)	$ 66
Options exercisable, number outstanding (in shares) | shares	138
Options exercisable, weighted average remaining contractual life (Year)	6 years 1 month 6 days
Options exercisable, weighted average exercise price (in dollars per share)	$ 66

Note 8 - Shareholders' Equity_3

Note 8 - Shareholders' Equity - Weighted Average Assumptions Used in the Option Pricing to Value Stock Options Granted (Details) - $ / shares		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Expected volatility (1)	[1]	20%	19%	20%
Expected life in years (2) (Year)	[2]	4 years 8 months 12 days	4 years 7 months 6 days	4 years 8 months 12 days
Risk-free interest rate (3)	[3]	3.60%	1.73%	0.46%
Expected dividend yield		3.66%	3.02%	2.79%
Fair value per award (in dollars per share)		$ 8.5	$ 7.9	$ 7.5
[1]Measured using daily price changes of Company's stock over respective expected term of the option and the implied volatility derived from the market prices of the Company's stock and traded options.[2]The number of years that the Company estimates that the options will be outstanding prior to exercise.[3]The risk-free rate over the expected life based on the US Treasury yield curve in effect at the time of the grant.

Note 8 - Shareholders' Equity_4

Note 8 - Shareholders' Equity - Summary of Option Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Outstanding (in shares)	854
Outstanding (in dollars per share)	$ 60.02
Granted (in shares)	225	229	193
Granted (in dollars per share)	$ 55.47
Exercised (in shares)	(22)	(40)	(53)
Exercised (in dollars per share)	$ 43.3
Forfeited or expired (in shares)	(84)
Forfeited or expired (in dollars per share)	$ 55.26
Outstanding (in shares)	973	854
Outstanding (in dollars per share)	$ 59.5	$ 60.02
Outstanding (Year)	6 years 6 months
Exercisable (in shares)	614
Exercisable (in dollars per share)	$ 61.17
Exercisable at December 31, 2023 (Year)	5 years 4 months 24 days

Note 8 - Shareholders' Equity_5

Note 8 - Shareholders' Equity - Summary of Nonvested Option Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Nonvested at January 1, 2023 (in shares)	346
Nonvested at January 1, 2023 (in dollars per share)	$ 7.88
Granted (in shares)	225	229	193
Granted (in dollars per share)	$ 8.5
Vested (in shares)	(164)
Vested (in dollars per share)	$ 7.99
Forfeited (in shares)	(48)
Forfeited (in dollars per share)	$ 8.18
Nonvested at December 31, 2023 (in shares)	359	346
Nonvested at December 31, 2023 (in dollars per share)	$ 8.18

Note 8 - Shareholders' Equity_6

Note 8 - Shareholders' Equity - Summary of the Status of Restricted Performance Shares (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Outstanding at January 1, (in shares)	31	30
Granted (in shares)	12	12
Issued upon vesting (in shares)	(9)	(8)
Forfeited (in shares)	(2)	(3)
Outstanding at December 31, (in shares)	32	31

Note 9 - Regulatory Capital (De

Note 9 - Regulatory Capital (Details Textual)	Dec. 31, 2023
Capital Conservation Buffer	2.50%

Note 9 - Regulatory Capital - C

Note 9 - Regulatory Capital - Capital Ratios for the Company and the Bank (Details) $ in Thousands		Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Common Equity Tier 1 Capital		$ 841,611	$ 736,414
Common Equity Tier 1 Capital, ratio		0.1876	0.1522
Common Equity Tier 1 Capital Required for Capital Adequacy		$ 313,959	$ 338,748
Common Equity Tier 1 Capital Required for Capital Adequacy, ratio		7%	7%
Tier 1 Capital		$ 841,611	$ 736,414
Tier 1 Capital, raio		0.1876	0.1522
Tier 1 Capital Required for Capital Adequacy		$ 381,236	$ 411,337
Tier 1 Capital Required for Capital Adequacy, ratio		0.085	0.085
Total Capital		$ 858,680	$ 756,900
Total Capital, ratio		0.1915	0.1564
Total Capital Required for Capital Adequacy		$ 470,939	$ 508,123
Total Capital Required for Capital Adequacy, ratio		0.105	0.105
Leverage Ratio, amount	[1]	$ 841,611	$ 736,414
Leverage Ratio	[1]	0.1286	0.1018
Leverage Ratio Required for Capital Adequacy, amount	[1]	$ 261,739	$ 289,259
Leverage Ratio Required for Capital Adequacy	[1]	0.04	0.04
Westamerica Bank [Member]
Common Equity Tier 1 Capital		$ 641,252	$ 592,804
Common Equity Tier 1 Capital, ratio		0.1446	0.1237
Common Equity Tier 1 Capital Required for Capital Adequacy		$ 310,362	$ 335,351
Common Equity Tier 1 Capital Required for Capital Adequacy, ratio		7%	7%
Common Equity Tier 1 Capital To Be Well-capitalized		$ 288,193	$ 311,397
Common Equity Tier 1 Capital To Be Well-capitalized, ratio		6.50%	6.50%
Tier 1 Capital		$ 641,252	$ 592,804
Tier 1 Capital, raio		0.1446	0.1237
Tier 1 Capital Required for Capital Adequacy		$ 376,868	$ 407,212
Tier 1 Capital Required for Capital Adequacy, ratio		0.085	0.085
Tier 1 Capital To Be Well-capitalized		$ 354,700	$ 383,258
Tier 1 Capital To Be Well-capitalized, ratio		0.08	0.08
Total Capital		$ 664,321	$ 619,290
Total Capital, ratio		0.1498	0.1293
Total Capital Required for Capital Adequacy		$ 465,543	$ 503,026
Total Capital Required for Capital Adequacy, ratio		0.105	0.105
Total Capital To Be Well-capitalized		$ 443,375	$ 479,073
Total Capital To Be Well-capitalized, ratio		0.10	0.10
Leverage Ratio, amount	[1]	$ 641,252	$ 592,804
Leverage Ratio	[1]	0.0988	0.0826
Leverage Ratio Required for Capital Adequacy, amount	[1]	$ 259,617	$ 287,229
Leverage Ratio Required for Capital Adequacy	[1]	0.04	0.04
Leverage Ratio To Be Well-capitalized, amount	[1]	$ 324,521	$ 359,036
Leverage Ratio To Be Well-capitalized, ratio	[1]	0.05	0.05
[1]The leverage ratio consists of Tier 1capital divided by the most recent quarterly average total assets, excluding certain intangible assets.

Note 10 - Income Taxes (Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Unrecognized Tax Benefits	$ 0	$ 0
Income Tax Examination, Penalties and Interest Expense	$ 0	$ 0

Note 10 - Income Taxes - Compon

Note 10 - Income Taxes - Components of Net Deferred Tax Asset (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax asset
Allowance for credit losses	$ 4,853	$ 5,858
Securities available for sale	79,865	107,493
State franchise taxes	4,816	3,805
Deferred compensation	3,828	4,091
Purchased assets and assumed liabilities	321	229
Post-retirement benefits	367	405
Employee benefit accruals	3,454	3,096
VISA Class B shares	343	507
Accrued liabilities	1,172	840
Premises and equipment	1,175	1,193
Lease liability	5,413	4,548
Other	69	99
Total deferred tax asset	105,676	132,164
Deferred tax liability
Net deferred loan costs	0	193
Right-of-use asset	5,413	4,548
Intangible assets	451	453
Limited partnership investments	305	1,830
Total deferred tax liability	6,169	7,024
Net deferred tax asset	$ 99,507	$ 125,140

Note 10 - Income Taxes - Provis

Note 10 - Income Taxes - Provision for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal	$ 38,075	$ 26,785	$ 15,299
State	23,731	16,075	11,320
Total current	61,806	42,860	26,619
Federal	(1,197)	(1,349)	1,281
State	(798)	2,046	842
Total deferred	(1,995)	697	2,123
Change in valuation reserve	0	0	1,776
Provision for income taxes	59,811	43,557	30,518
Domestic Tax Authority [Member]
Change in valuation reserve	0	0	(472)
State and Local Jurisdiction [Member]
Change in valuation reserve	$ 0	$ 0	$ 2,248

Note 10 - Income Taxes - Reconc

Note 10 - Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Federal income taxes due at statutory rate	$ 46,532	$ 34,774	$ 24,576
Interest on state and municipal securities and loans not taxable for federal income tax purposes	(1,188)	(1,484)	(2,070)
State franchise taxes, net of federal income tax benefit	18,117	14,315	9,757
Change in valuation reserve	0	0	1,776
Stock compensation deduction less than (in excess of) book expense	3	30	0
Tax credits	(2,943)	(3,439)	(2,621)
Dividend received deduction	(66)	(56)	(48)
Cash value life insurance	(597)	(421)	(389)
Other	(47)	(162)	(463)
Provision for income taxes	$ 59,811	$ 43,557	$ 30,518

Note 11 - Fair Value Measurem_3

Note 11 - Fair Value Measurements (Details Textual)	12 Months Ended
	Dec. 31, 2023
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Appraisal Rate	10%

Note 11 - Fair Value Measurem_4

Note 11 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023		Dec. 31, 2022
Investment securities available for sale	$ 3,999,801		$ 4,331,743
Agency Residential MBS [Member]
Investment securities available for sale	239,454		286,048
US Government Agencies Debt Securities [Member]
Investment securities available for sale	294,919		290,853
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale	71,283		82,004
Corporate Debt Securities [Member]
Investment securities available for sale	1,909,548		2,099,955
Fair Value, Recurring [Member]
Investment securities available for sale	3,999,801		4,331,743
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	3,999,801		4,331,743
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	[1]	0	[2]
Fair Value, Recurring [Member] | Agency Residential MBS [Member]
Investment securities available for sale	239,454		286,048
Fair Value, Recurring [Member] | Agency Residential MBS [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | Agency Residential MBS [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	239,454		286,048
Fair Value, Recurring [Member] | Agency Residential MBS [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0		0	[2]
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Investment securities available for sale	294,919		290,853
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	294,919		290,853
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0		0	[2]
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale	71,283		82,004
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	71,283		82,004
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	[1]	0	[2]
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Investment securities available for sale	1,909,548		2,099,955
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	1,909,548		2,099,955
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	0	[1]	0	[2]
Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member]
Investment securities available for sale	1,484,597		1,572,883
Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Investment securities available for sale	0		0
Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 2 [Member]
Investment securities available for sale	1,484,597		1,572,883
Fair Value, Recurring [Member] | Collateralized Loan Obligations [Member] | Fair Value, Inputs, Level 3 [Member]
Investment securities available for sale	$ 0	[1]	$ 0	[2]
[1]There were no transfers in to or out of level 3 during the six months ended June 30, 2023.[2]There were no transfers in to or out of level 3 during the year ended December 31, 2022.

Note 11 - Fair Value Measurem_5

Note 11 - Fair Value Measurements - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value	$ 110	$ 225
Total Losses	0	0
Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value	110	225
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Fair Value	110	225
Total Losses	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value	0	0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value	$ 110	$ 225

Note 11 - Fair Value Measurem_6

Note 11 - Fair Value Measurements - Fair Value Estimates for Financial Instruments, Excluding Financial Instruments Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Cash and due from banks	$ 190,314	$ 294,236
Debt securities held to maturity	878,396	915,913
Loans	849,735	938,204
Deposits	5,474,267	6,225,290
Short-term borrowed funds	58,162	57,792
Estimate of Fair Value Measurement [Member]
Cash and due from banks	190,314	294,236
Debt securities held to maturity	849,562	873,511
Loans	847,031	905,720
Deposits	5,474,012	6,224,791
Short-term borrowed funds	58,162	57,792
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and due from banks	190,314	294,236
Debt securities held to maturity	0	0
Loans	0	0
Deposits	0	0
Short-term borrowed funds	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and due from banks	0	0
Debt securities held to maturity	849,562	873,511
Loans	0	0
Deposits	5,377,465	6,094,535
Short-term borrowed funds	58,162	57,792
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and due from banks	0	0
Debt securities held to maturity	0	0
Loans	847,031	905,720
Deposits	96,547	130,256
Short-term borrowed funds	$ 0	$ 0

Note 12 - Commitments and Con_2

Note 12 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loan Commitments, Not Unconditionally Cancellable	$ 29,958	$ 31,889
Unfunded Loan Commitments	206,028	202,696
Guarantor Obligations, Current Carrying Value	1,000	950
Other Liabilities [Member]
Reserve for Unfunded Commitments	201	201
Financial Standby Letter of Credit [Member]
Letters of Credit Outstanding, Amount	2,044	1,948
Commercial Standby Letters of Credit [Member]
Letters of Credit Outstanding, Amount	$ 95	$ 95

Note 13 - Retirement Benefit _3

Note 13 - Retirement Benefit Plans (Details Textual) - USD ($) Pure in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Plan, Cost	$ 1,090	$ 1,030	$ 1,028
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 873	$ 921	$ 972
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	0%

Note 13 - Retirement Benefit _4

Note 13 - Retirement Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Service benefit	$ (56)	$ (19)	$ (15)
Interest cost	70	38	30
Net periodic cost	$ 14	$ 19	$ 15

Note 13 - Retirement Benefit _5

Note 13 - Retirement Benefit Plans - Obligation and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Benefit obligation	$ 1,401	$ 1,527	$ 1,654
Service benefit	(56)	(19)	(15)
Interest cost	70	38	30
Benefits paid	(139)	(145)	(142)
Benefit obligation	1,276	1,401	1,527
Fair value of plan assets	0	0	0
Accumulated post-retirement benefit obligation in excess of plan assets	1,276	1,401	1,527
Retirees [Member]
Benefit obligation	1,401	1,527
Benefit obligation	1,276	1,401	1,527
Other Participants [Member]
Benefit obligation	0	0
Benefit obligation	$ 0	$ 0	$ 0

Note 13 - Retirement Benefit _6

Note 13 - Retirement Benefit Plans - Assumptions (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Discount rate	4.75%	5.01%	2.46%
Discount rate	5.01%	2.46%	1.80%

Note 13 - Retirement Benefit _7

Note 13 - Retirement Benefit Plans - Estimated Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
2024	$ 133
2025	133
2026	133
2027	127
2028	118
Years 2027-2031, estimated future benefit payment	$ 424

Note 14 - Related Party Trans_3

Note 14 - Related Party Transactions - Related Party Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance	$ 400	$ 454
Originations	0	0
Principal reductions	(51)	(54)
Balance	$ 349	$ 400
Percent of total loans outstanding.	0.04%	0.04%

Note 16 - Other Comprehensive_3

Note 16 - Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Other Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in net unrealized losses arising during the year, before tax	$ 93,326	$ (434,107)	$ (91,891)
Changes in net unrealized losses arising during the year, tax	(27,591)	128,338	27,167
Changes in net unrealized losses arising during the year, net of tax	65,735	(305,769)	(64,724)
Reclassification of losses (gains) included in net income	125	0	(34)
Deferred tax (benefit on losses) expense on gains included in net income	(37)	0	10
Reclassification of losses included in net income, net of tax	88		(24)
Other comprehensive income (loss), before tax	93,451	(434,107)	(91,925)
Other comprehensive income, tax	(27,628)	128,338	27,177
Other comprehensive income (loss), net of tax	65,823	(305,769)	(64,748)
Reclassification of gains (losses) included in net income, before tax	125	0	(34)
Reclassification of gains (losses) included in net income, tax	$ (37)	$ 0	$ 10

Note 16 - Other Comprehensive_4

Note 16 - Other Comprehensive Income (Loss) - Cumulative Other Comprehensive Income (Loss) Balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Balance	$ 602,110	$ 827,102	$ 844,809
Changes in unrealized gains on debt securities available for sale, net of tax	65,823	(305,769)	(64,748)
Balance	772,894	602,110	827,102
AOCI Attributable to Parent [Member]
Balance	(256,105)	49,664	114,412
Balance	$ (190,282)	(256,105)	49,664
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Changes in unrealized gains on debt securities available for sale, net of tax		$ (305,769)	$ (64,748)

Note 17 - Earnings Per Common_3

Note 17 - Earnings Per Common Share (Details Textual) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-Based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	983	787	649

Note 17 - Earnings Per Common_4

Note 17 - Earnings Per Common Share - Earnings Per Common Share and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income (numerator)	$ 39,468	$ 41,601	$ 40,248	$ 40,451	$ 39,344	$ 34,760	$ 25,314	$ 22,616	$ 21,720	$ 22,063	$ 22,579	$ 20,147	$ 161,768	$ 122,034	$ 86,509
Weighted average number of common shares outstanding - basic (denominator) (in shares)													26,703	26,895	26,855
Basic earnings per common share (in dollars per share)	$ 1.48	$ 1.56	$ 1.51	$ 1.51	$ 1.46	$ 1.29	$ 0.94	$ 0.84	$ 0.81	$ 0.82	$ 0.84	$ 0.75	$ 6.06	$ 4.54	$ 3.22
Add common stock equivalents for options (in shares)													3	12	15
Weighted average number of common shares outstanding - diluted (denominator) (in shares)													26,706	26,907	26,870
Diluted earnings per common share (in dollars per share)	$ 1.48	$ 1.56	$ 1.51	$ 1.51	$ 1.46	$ 1.29	$ 0.94	$ 0.84	$ 0.81	$ 0.82	$ 0.84	$ 0.75	$ 6.06	$ 4.54	$ 3.22

Note 18 - Westamerica Bancorp_3

Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) - Statements of Income and Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Salaries and related benefits													$ 47,871	$ 46,125	$ 48,011
Income before taxes and equity in undistributed income of subsidiaries	$ 54,848	$ 56,946	$ 54,743	$ 55,042	$ 54,096	$ 47,366	$ 34,149	$ 29,980	$ 29,467	$ 29,903	$ 30,533	$ 27,124	221,579	165,591	117,027
Income tax expense													(59,811)	(43,557)	(30,518)
Net Income	$ 39,468	$ 41,601	$ 40,248	$ 40,451	$ 39,344	$ 34,760	$ 25,314	$ 22,616	$ 21,720	$ 22,063	$ 22,579	$ 20,147	161,768	122,034	86,509
Other comprehensive income (loss), net of tax													65,823	(305,769)	(64,748)
Comprehensive income (loss)													227,591	(183,735)	21,761
Parent Company [Member]
Dividends from subsidiaries													110,769	70,267	29,279
Interest income													57	49	44
Other income													11,935	11,386	11,608
Total income													122,761	81,702	40,931
Salaries and related benefits													5,710	5,832	6,612
Other expense													2,315	2,609	2,279
Total expense													8,025	8,441	8,891
Income before taxes and equity in undistributed income of subsidiaries													114,736	73,261	32,040
Income tax expense													(1,179)	(881)	(645)
Earnings of subsidiaries greater than subsidiary dividends													48,211	49,654	55,114
Net Income													161,768	122,034	86,509
Other comprehensive income (loss), net of tax													65,823	(305,769)	(64,748)
Comprehensive income (loss)													$ 227,591	$ (183,735)	$ 21,761

Note 18 - Westamerica Bancorp_4

Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net Book Value	$ 27,016	$ 28,819
Other assets	297,310	319,146
Total assets	6,364,592	6,950,317
Other liabilities	59,269	65,125
Total liabilities	5,591,698	6,348,207
Shareholders' equity	772,894	602,110	$ 827,102	$ 844,809
Total liabilities and shareholders' equity	6,364,592	6,950,317
Parent Company [Member]
Cash	154,999	99,478
Net Book Value	9,123	9,411
Other assets	45,694	44,831
Total assets	789,143	618,918
Other liabilities	16,178	16,768
Total liabilities	16,249	16,808
Shareholders' equity	772,894	602,110
Total liabilities and shareholders' equity	789,143	618,918
Parent Company [Member] | Related Party [Member]
Accounts receivable from Westamerica Bank	341	245
Accounts payable to Westamerica Bank	71	40
Parent Company [Member] | Bank Subsidiary [Member]
Investment	578,535	464,500
Parent Company [Member] | Non-bank Subsidiaries [Member]
Investment	$ 451	$ 453

Note 18 - Westamerica Bancorp_5

Note 18 - Westamerica Bancorporation (Parent Company Only Condensed Financial Information) - Cash Flows Statement (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net Income	$ 39,468	$ 41,601	$ 40,248	$ 40,451	$ 39,344	$ 34,760	$ 25,314	$ 22,616	$ 21,720	$ 22,063	$ 22,579	$ 20,147	$ 161,768	$ 122,034	$ 86,509
Depreciation and amortization													11,774	16,565	16,617
Other assets													(3,443)	(2,415)	(3,534)
Stock option compensation expense													1,356	1,309	1,419
Provision for deferred income tax													(1,995)	697	2,123
(Decrease) increase in other liabilities													(7,484)	(6,827)	(6,940)
Net Cash Provided by Operating Activities													158,208	113,702	88,735
Net Cash Used in Investing Activities													547,274	(631,286)	(306,084)
Financing Activities:
Exercise of stock options													950	2,255	3,017
Retirement of common stock													(13,747)	(218)	(232)
Common stock dividends paid													45,954	45,182	44,304
Net Cash Used in Financing Activities													(809,404)	(320,265)	728,159
Net change in cash and due from banks													(103,922)	(837,849)	510,810
Cash and Due from Banks at Beginning of Period				294,236				1,132,085				621,275	294,236	1,132,085	621,275
Cash and Due from Banks at End of Period	190,314				294,236				1,132,085				190,314	294,236	1,132,085
Supplemental disclosure of cash flow activities:
Income tax payments for the period													64,017	39,840	27,673
Parent Company [Member]
Net Income													161,768	122,034	86,509
Depreciation and amortization													539	563	569
Decrease (increase) in accounts receivable from affiliates													1,224	(771)	117
Other assets													(2,048)	(1,639)	(1,223)
Stock option compensation expense													1,356	1,309	1,419
Provision for deferred income tax													1,179	881	645
(Decrease) increase in other liabilities													(1,326)	(38)	254
Earnings of subsidiaries greater than subsidiary dividends													(48,211)	(49,654)	(55,114)
Net Cash Provided by Operating Activities													114,481	72,685	33,176
Purchases of equipment													(209)	(5)	(78)
Net Cash Used in Investing Activities													(209)	(5)	(78)
Financing Activities:
Exercise of stock options													950	2,255	3,017
Retirement of common stock													(13,747)	(218)	(232)
Common stock dividends paid													45,954	45,182	44,304
Net Cash Used in Financing Activities													(58,751)	(43,145)	(41,519)
Net change in cash and due from banks													55,521	29,535	(8,421)
Cash and Due from Banks at Beginning of Period				$ 99,478				$ 69,943				$ 78,364	99,478	69,943	78,364
Cash and Due from Banks at End of Period	$ 154,999				$ 99,478				$ 69,943				154,999	99,478	69,943
Supplemental disclosure of cash flow activities:
Income tax payments for the period													$ 64,017	$ 39,840	$ 27,673

Note 19 - Quarterly Financial_3

Note 19 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and loan fee income	$ 71,052	$ 72,848	$ 70,489	$ 69,624	$ 69,198	$ 60,802	$ 47,997	$ 43,759	$ 43,041	$ 43,810	$ 44,276	$ 42,316	$ 284,013	$ 221,756	$ 173,443
Net interest income	69,373	71,715	69,882	69,153	68,723	60,315	47,514	43,279	42,537	43,318	43,792	41,841	280,123	219,831	171,488
Reversal of Provision for Credit Losses	0	400	0	(1,550)	0	0	0	0	0	0	0	0	(1,150)	0	0
Noninterest income	10,992	11,281	10,700	10,549	10,463	11,818	11,264	11,576	10,842	11,282	11,032	10,189	43,522	45,121	43,345
Noninterest expense	25,517	25,650	25,839	26,210	25,090	24,767	24,629	24,875	23,912	24,697	24,291	24,906	103,216	99,361	97,806
Income before taxes and equity in undistributed income of subsidiaries	54,848	56,946	54,743	55,042	54,096	47,366	34,149	29,980	29,467	29,903	30,533	27,124	221,579	165,591	117,027
Net Income	$ 39,468	$ 41,601	$ 40,248	$ 40,451	$ 39,344	$ 34,760	$ 25,314	$ 22,616	$ 21,720	$ 22,063	$ 22,579	$ 20,147	$ 161,768	$ 122,034	$ 86,509
Basic earnings per common share (in dollars per share)	$ 1.48	$ 1.56	$ 1.51	$ 1.51	$ 1.46	$ 1.29	$ 0.94	$ 0.84	$ 0.81	$ 0.82	$ 0.84	$ 0.75	$ 6.06	$ 4.54	$ 3.22
Diluted earnings per common share (in dollars per share)	1.48	1.56	1.51	1.51	1.46	1.29	0.94	0.84	0.81	0.82	0.84	0.75	6.06	4.54	3.22
Dividends paid (in dollars per share)	0.44	0.44	0.42	0.42	0.42	0.42	0.42	0.42	0.42	0.41	0.41	0.41	1.72	1.68	1.65
Share price, common stock (in dollars per share)	56.41												56.41
Minimum [Member]
Share price, common stock (in dollars per share)	42.59	38.87	36.85	44.04	52.22	52.29	55.66	57.54	53.78	54.03	57.67	55.82	42.59	52.22	53.78
Maximum [Member]
Share price, common stock (in dollars per share)	$ 57.21	$ 49.87	$ 43.5	$ 58.34	$ 63.39	$ 61.52	$ 61.3	$ 62.76	$ 58	$ 58.55	$ 64.8	$ 66.43	$ 57.21	$ 63.39	$ 58