$WABC
Westamerica Bancorp Stock $wabc

$wabc Overview Financials Valuation SEC Filings Company Website

2024 Q2 Form 10-Q Financial Statement

#000117184324002705 Filed on May 09, 2024

Income Statement

Concept	2024 Q2	2024 Q1
Revenue	$69.07M	$68.75M
YoY Change	-2.01%	-1.26%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.854M	$2.962M
YoY Change	5.39%	-2.69%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$3.001M
YoY Change		537.15%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$48.14M	$49.44M
YoY Change	-12.07%	-10.17%
Income Tax	$12.67M	$13.03M
% Of Pretax Income	26.33%	26.35%
Net Earnings	$35.46M	$36.42M
YoY Change	-11.89%	-9.97%
Net Earnings / Revenue	51.34%	52.97%
Basic Earnings Per Share	$1.33	$1.37
Diluted Earnings Per Share	$1.33	$1.37
COMMON SHARES
Basic Shares Outstanding	26.68M	26.67M
Diluted Shares Outstanding	26.68M	26.68M

Balance Sheet

Concept	2024 Q2	2024 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$486.1M	$434.3M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$26.28M	$26.46M
YoY Change	-5.85%	-6.61%
Goodwill	$121.7M	$121.7M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$158.0K	$158.0K
YoY Change	-98.89%	-98.88%
Other Assets	$100.8M	$100.4M
YoY Change	-17.69%	-12.42%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$6.312B	$6.465B
YoY Change	-4.11%	-3.52%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$9.051M
YoY Change
Accrued Expenses	$18.83M	$19.98M
YoY Change	12.18%	29.31%
Deferred Revenue
YoY Change
Short-Term Debt	$100.2M	$50.33M
YoY Change	-27.42%	-39.42%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$100.2M	$50.33M
YoY Change	-27.42%	-48.92%
LONG-TERM LIABILITIES
Long-Term Debt	$200.0M	$200.0M
YoY Change
Other Long-Term Liabilities	$64.94M	$67.74M
YoY Change	-25.31%	13.47%
Total Long-Term Liabilities	$264.9M	$267.7M
YoY Change	204.72%	348.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$100.2M	$50.33M
Total Long-Term Liabilities	$264.9M	$267.7M
Total Liabilities	$5.497B	$5.673B
YoY Change	-7.32%	-6.35%
SHAREHOLDERS EQUITY
Retained Earnings	$538.3M	$514.6M
YoY Change	24.49%	27.57%
Common Stock	$474.6M	$474.0M
YoY Change	0.66%	0.6%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$815.6M	$791.7M
YoY Change
Total Liabilities & Shareholders Equity	$6.312B	$6.465B
YoY Change	-4.11%	-3.52%

Cashflow Statement

Concept	2024 Q2	2024 Q1
OPERATING ACTIVITIES
Net Income	$35.46M	$36.42M
YoY Change	-11.89%	-9.97%
Depreciation, Depletion And Amortization	$2.854M	$2.962M
YoY Change	5.39%	-2.69%
Cash From Operating Activities	$19.03M	$52.21M
YoY Change	-63.8%	-5.21%
INVESTING ACTIVITIES
Capital Expenditures	$461.0K	$122.0K
YoY Change	483.54%	-76.13%
Acquisitions
YoY Change
Other Investing Activities	$218.5M	$131.0M
YoY Change	29.94%	-23.91%
Cash From Investing Activities	$218.0M	$130.8M
YoY Change	29.73%	-23.76%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-185.2M	$60.89M
YoY Change	23.74%	-118.69%
NET CHANGE
Cash From Operating Activities	19.03M	$52.21M
Cash From Investing Activities	218.0M	$130.8M
Cash From Financing Activities	-185.2M	$60.89M
Net Change In Cash	51.87M	$243.9M
YoY Change	-26.92%	-346.32%
FREE CASH FLOW
Cash From Operating Activities	$19.03M	$52.21M
Capital Expenditures	$461.0K	$122.0K
Free Cash Flow	$18.57M	$52.09M
YoY Change	-64.62%	-4.55%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2024Q1	dei	Entity Registrant Name EntityRegistrantName	WESTAMERICA BANCORPORATION
CY2024Q1	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q1
CY2024Q1	dei	Entity Central Index Key EntityCentralIndexKey	0000311094
CY2024Q1	dei	Amendment Flag AmendmentFlag	false
CY2024Q1	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2024Q1	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	829455000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	849562000	usd
CY2024Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2023Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2024Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000
CY2024Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	26678000
CY2024Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	26678000
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	26671000
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	26671000
CY2023Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.42
CY2024Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.44
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2023Q4	wabc	Loans And Leases Receivable Nonaccrual Commitment To Lend LoansAndLeasesReceivableNonaccrualCommitmentToLend	0	usd
CY2023Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	0	usd
CY2023Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	0	usd
CY2023Q4	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2023Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	usd
CY2024Q1	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P5Y
CY2024Q1	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2024Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19975000	usd
CY2024Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2023Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	usd
CY2023Q1	wabc	Amortization Expense Adjustment Resulting From A Change In Estimates Of Useful Lives Or Residual Values AmortizationExpenseAdjustmentResultingFromAChangeInEstimatesOfUsefulLivesOrResidualValues	0	usd
CY2024Q1	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2024Q1	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q1	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q1	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q1	dei	Document Type DocumentType	10-Q
CY2024Q1	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2024Q1	dei	Document Period End Date DocumentPeriodEndDate	2024-03-31
CY2024Q1	dei	Document Transition Report DocumentTransitionReport	false
CY2024Q1	dei	Entity File Number EntityFileNumber	001-09383
CY2024Q1	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	CA
CY2024Q1	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	94-2156203
CY2024Q1	dei	Entity Address Address Line1 EntityAddressAddressLine1	1108 FIFTH AVENUE
CY2024Q1	dei	Entity Address City Or Town EntityAddressCityOrTown	SAN RAFAEL
CY2024Q1	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
CY2024Q1	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	94901
CY2024Q1	dei	City Area Code CityAreaCode	707
CY2024Q1	dei	Local Phone Number LocalPhoneNumber	863-6000
CY2024Q1	dei	Security12b Title Security12bTitle	Common Stock, no par value
CY2024Q1	dei	Trading Symbol TradingSymbol	WABC
CY2024Q1	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2024Q1	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2024Q1	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2024Q1	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2024Q1	dei	Entity Small Business EntitySmallBusiness	false
CY2024Q1	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2024Q1	dei	Entity Shell Company EntityShellCompany	false
CY2024Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	26678401
CY2024Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	434250000	usd
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	190314000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3889177000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3999801000	usd
CY2024Q1	wabc	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	868725000	usd
CY2023Q4	wabc	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	878396000	usd
CY2024Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	844677000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	866602000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	15879000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16867000	usd
CY2024Q1	us-gaap	Notes Receivable Net NotesReceivableNet	828798000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	849735000	usd
CY2024Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	26458000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	27016000	usd
CY2024Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	291000	usd
CY2023Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	347000	usd
CY2024Q1	us-gaap	Goodwill Goodwill	121673000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	121673000	usd
CY2024Q1	us-gaap	Other Assets OtherAssets	295313000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	297310000	usd
CY2024Q1	us-gaap	Assets Assets	6464685000	usd
CY2023Q4	us-gaap	Assets Assets	6364592000	usd
CY2024Q1	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2514161000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2605844000	usd
CY2024Q1	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2840764000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2868423000	usd
CY2024Q1	us-gaap	Deposits Deposits	5354925000	usd
CY2023Q4	us-gaap	Deposits Deposits	5474267000	usd
CY2024Q1	wabc	Bank Term Funding Program Borrowings BankTermFundingProgramBorrowings	200000000	usd
CY2023Q4	wabc	Bank Term Funding Program Borrowings BankTermFundingProgramBorrowings	0	usd
CY2024Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	50334000	usd
CY2023Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	58162000	usd
CY2024Q1	us-gaap	Other Liabilities OtherLiabilities	67735000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	59269000	usd
CY2024Q1	us-gaap	Liabilities Liabilities	5672994000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	5591698000	usd
CY2024Q1	us-gaap	Common Stock Value CommonStockValue	473954000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	473136000	usd
CY2024Q1	wabc	Deferred Compensation DeferredCompensation	35000	usd
CY2023Q4	wabc	Deferred Compensation DeferredCompensation	35000	usd
CY2024Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-196857000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-190282000	usd
CY2024Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	514559000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	490005000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	791691000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	772894000	usd
CY2024Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6464685000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6364592000	usd
CY2024Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	11324000	usd
CY2023Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	11740000	usd
CY2024Q1	wabc	Interest And Dividend Income Equity Securities Operating InterestAndDividendIncomeEquitySecuritiesOperating	174000	usd
CY2023Q1	wabc	Interest And Dividend Income Equity Securities Operating InterestAndDividendIncomeEquitySecuritiesOperating	152000	usd
CY2024Q1	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	46243000	usd
CY2023Q1	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	46810000	usd
CY2024Q1	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	8722000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	8980000	usd
CY2024Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	2283000	usd
CY2023Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1942000	usd
CY2024Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	68746000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	69624000	usd
CY2024Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2106000	usd
CY2023Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	458000	usd
CY2024Q1	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	843000	usd
CY2023Q1	us-gaap	Interest Expense Federal Funds Purchased InterestExpenseFederalFundsPurchased	0	usd
CY2024Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	52000	usd
CY2023Q1	us-gaap	Interest Expense Securities Sold Under Agreements To Repurchase InterestExpenseSecuritiesSoldUnderAgreementsToRepurchase	13000	usd
CY2024Q1	us-gaap	Interest Expense InterestExpense	3001000	usd
CY2023Q1	us-gaap	Interest Expense InterestExpense	471000	usd
CY2024Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	65745000	usd
CY2023Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	69153000	usd
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	300000	usd
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-1550000	usd
CY2024Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	65445000	usd
CY2023Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	70703000	usd
CY2024Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	754000	usd
CY2023Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	987000	usd
CY2024Q1	us-gaap	Noninterest Income NoninterestIncome	10097000	usd
CY2023Q1	us-gaap	Noninterest Income NoninterestIncome	10549000	usd
CY2024Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	12586000	usd
CY2023Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	12067000	usd
CY2024Q1	us-gaap	Occupancy Net OccupancyNet	5040000	usd
CY2023Q1	us-gaap	Occupancy Net OccupancyNet	5485000	usd
CY2024Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2536000	usd
CY2023Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2444000	usd
CY2024Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1440000	usd
CY2023Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1434000	usd
CY2024Q1	wabc	Contract Courier Expense ContractCourierExpense	649000	usd
CY2023Q1	wabc	Contract Courier Expense ContractCourierExpense	615000	usd
CY2024Q1	us-gaap	Professional Fees ProfessionalFees	402000	usd
CY2023Q1	us-gaap	Professional Fees ProfessionalFees	476000	usd
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CY2023Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3689000	usd
CY2024Q1	us-gaap	Noninterest Expense NoninterestExpense	26099000	usd
CY2023Q1	us-gaap	Noninterest Expense NoninterestExpense	26210000	usd
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CY2023Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	55042000	usd
CY2024Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13026000	usd
CY2023Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14591000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	36417000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	40451000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26674000
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26859000
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26675000
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26866000
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.37
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.51
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.51
CY2024Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.44
CY2023Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.42
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	36417000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	40451000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-9335000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	34830000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2760000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	10298000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-6575000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	24532000	usd
CY2024Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	29842000	usd
CY2023Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	64983000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	602110000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	40451000	usd
CY2023Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	24532000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	508000	usd
CY2023Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	339000	usd
CY2023Q1	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	35000	usd
CY2023Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	13747000	usd
CY2023Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	11303000	usd
CY2023Q1	us-gaap	Stockholders Equity StockholdersEquity	642925000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	772894000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	36417000	usd
CY2024Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-6575000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	505000	usd
CY2024Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	364000	usd
CY2024Q1	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	31000	usd
CY2024Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	210000	usd
CY2024Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	11735000	usd
CY2024Q1	us-gaap	Stockholders Equity StockholdersEquity	791691000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	36417000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	40451000	usd
CY2024Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	2962000	usd
CY2023Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	3044000	usd
CY2024Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	300000	usd
CY2023Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-1550000	usd
CY2024Q1	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	150000	usd
CY2023Q1	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	128000	usd
CY2024Q1	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	364000	usd
CY2023Q1	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	339000	usd
CY2024Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-568000	usd
CY2023Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	118000	usd
CY2024Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-9742000	usd
CY2023Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-14336000	usd
CY2024Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-3285000	usd
CY2023Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-254000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-596000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1930000	usd
CY2024Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1009000	usd
CY2023Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	32000	usd
CY2024Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2881000	usd
CY2023Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-3508000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	52212000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	55082000	usd
CY2024Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-20787000	usd
CY2023Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-19213000	usd
CY2024Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	-0	usd
CY2023Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	2192000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	98966000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	147030000	usd
CY2024Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	11208000	usd
CY2023Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	8073000	usd
CY2024Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	122000	usd
CY2023Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	511000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	130839000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	171613000	usd
CY2024Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-119342000	usd
CY2023Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-325975000	usd
CY2024Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	192172000	usd
CY2023Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	25296000	usd
CY2024Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	210000	usd
CY2023Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	13747000	usd
CY2024Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11735000	usd
CY2023Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11303000	usd
CY2024Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	60885000	usd
CY2023Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-325729000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	243936000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-99034000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	190314000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	294236000	usd
CY2024Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	434250000	usd
CY2023Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	195202000	usd
CY2024Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2641000	usd
CY2023Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1144000	usd
CY2024Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1632000	usd
CY2023Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1519000	usd
CY2024Q1	us-gaap	Interest Paid Net InterestPaidNet	1992000	usd
CY2023Q1	us-gaap	Interest Paid Net InterestPaidNet	439000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	280884000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3889177000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	868726000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4168659000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1402000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	27000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	39298000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	829455000	usd
CY2024Q1	wabc	Debt Securities Availableforsale And Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleAndHeldtomaturityAmortizedCost	5037385000	usd
CY2024Q1	wabc	Debt Securities Gross Unrecognized Gains DebtSecuritiesGrossUnrecognizedGains	1429000	usd
CY2024Q1	wabc	Debt Securities Gross Unrecognized Losses DebtSecuritiesGrossUnrecognizedLosses	320182000	usd
CY2024Q1	wabc	Debt Securities Availableforsale And Heldtomaturity Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityBeforeAllowanceForCreditLoss	4718632000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4269948000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1360000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	271507000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3999801000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	878397000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	148000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	28983000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	849562000	usd
CY2023Q4	wabc	Debt Securities Availableforsale And Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleAndHeldtomaturityAmortizedCost	5148345000	usd
CY2023Q4	wabc	Debt Securities Gross Unrecognized Gains DebtSecuritiesGrossUnrecognizedGains	1508000	usd
CY2023Q4	wabc	Debt Securities Gross Unrecognized Losses DebtSecuritiesGrossUnrecognizedLosses	300490000	usd
CY2023Q4	wabc	Debt Securities Availableforsale And Heldtomaturity Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityBeforeAllowanceForCreditLoss	4849363000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	89869000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	88874000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	11839000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	11787000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	772465000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	731203000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	314968000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	307527000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1626990000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1422952000	usd
CY2024Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	468896000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	442615000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	2489324000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	2243029000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	795703000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	761929000	usd
CY2024Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4168659000	usd
CY2024Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3889177000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	868726000	usd
CY2024Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	829455000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	52703000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	52357000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	15117000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	15095000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	756658000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	721179000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	312847000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	307557000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1701189000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1502214000	usd
CY2023Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	471868000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	453598000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	2510550000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	2275750000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	799832000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	776250000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	4269948000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3999801000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	878397000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	849562000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	31	pure
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	279378000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4572000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	379	pure
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	3006026000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	276312000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	410	pure
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3285404000	usd
CY2024Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	280884000	usd
CY2024Q1	wabc	Heldtomaturity Securities Less Than12 Months Number Of Positions HeldtomaturitySecuritiesLessThan12MonthsNumberOfPositions	50	pure
CY2024Q1	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value Without Allowance For Credit Loss DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValueWithoutAllowanceForCreditLoss	90938000	usd
CY2024Q1	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1	1503000	usd
CY2024Q1	wabc	Heldtomaturity Securities12 Months Or Longer Number Of Positions HeldtomaturitySecurities12MonthsOrLongerNumberOfPositions	159	pure
CY2024Q1	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue1	728248000	usd
CY2024Q1	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1	37795000	usd
CY2024Q1	wabc	Heldtomaturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 HeldtomaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	209	pure
CY2024Q1	wabc	Debt Securities Heldtomaturity Unrealized Loss Position Fair Value1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionFairValue1	819186000	usd
CY2024Q1	wabc	Debt Securities Heldtomaturity Unrealized Loss Position Accumulated Loss DebtSecuritiesHeldtomaturityUnrealizedLossPositionAccumulatedLoss	39298000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	39	pure
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	440504000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	8946000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	394	pure
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	3047766000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	262561000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	433	pure
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	3488270000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	271507000	usd
CY2023Q4	wabc	Heldtomaturity Securities Less Than12 Months Number Of Positions HeldtomaturitySecuritiesLessThan12MonthsNumberOfPositions	27	pure
CY2023Q4	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value Without Allowance For Credit Loss DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValueWithoutAllowanceForCreditLoss	45166000	usd
CY2023Q4	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1	1274000	usd
CY2023Q4	wabc	Heldtomaturity Securities12 Months Or Longer Number Of Positions HeldtomaturitySecurities12MonthsOrLongerNumberOfPositions	165	pure
CY2023Q4	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue1	739440000	usd
CY2023Q4	wabc	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1	27709000	usd
CY2023Q4	wabc	Heldtomaturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 HeldtomaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	192	pure
CY2023Q4	wabc	Debt Securities Heldtomaturity Unrealized Loss Position Fair Value1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionFairValue1	784606000	usd
CY2023Q4	wabc	Debt Securities Heldtomaturity Unrealized Loss Position Accumulated Loss DebtSecuritiesHeldtomaturityUnrealizedLossPositionAccumulatedLoss	28983000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Writeoff DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff	0	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Writeoff DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff	0	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	0	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	0	usd
CY2024Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2023Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	1000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	866602000	usd
CY2024Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	868726000	usd
CY2024Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	54145000	usd
CY2023Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	54749000	usd
CY2024Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	994000	usd
CY2023Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	1193000	usd
CY2024Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	55139000	usd
CY2023Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	55942000	usd
CY2024Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	844677000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	866602000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16867000	usd
CY2024Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	300000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2003000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	715000	usd
CY2024Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	15879000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	20284000	usd
CY2023Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-1550000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2039000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2814000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	19509000	usd
CY2024Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	844677000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	866602000	usd
CY2024Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	958000	usd
CY2024Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	844677000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	403000	usd
CY2023Q4	wabc	Lihtc Investments LIHTCInvestments	28667000	usd
CY2023Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	15561000	usd
CY2024Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	14215000	usd
CY2024Q1	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	0	usd
CY2024Q1	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2024Q1	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	0	usd
CY2024Q1	wabc	Unsecured Loan Limit Percentage Of Shareholders Equity California Financial Code UnsecuredLoanLimitPercentageOfShareholdersEquityCaliforniaFinancialCode	0.15	pure
CY2024Q1	wabc	Secured And Unsecured Loan Limit Percentage California Financial Code SecuredAndUnsecuredLoanLimitPercentageCaliforniaFinancialCode	0.25	pure
CY2024Q1	wabc	Loan Commitments Related To Real Estate Loans LoanCommitmentsRelatedToRealEstateLoans	30565000	usd
CY2023Q4	wabc	Loan Commitments Related To Real Estate Loans LoanCommitmentsRelatedToRealEstateLoans	30888000	usd
CY2024Q1	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14069000	usd
CY2023Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14069000	usd
CY2024Q1	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	158000	usd
CY2023Q4	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	158000	usd
CY2024Q1	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	14227000	usd
CY2023Q4	us-gaap	Equity Securities Without Readily Determinable Fair Value Amount EquitySecuritiesWithoutReadilyDeterminableFairValueAmount	14227000	usd
CY2024Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	67366000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	66611000	usd
CY2024Q1	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	100357000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	99507000	usd
CY2024Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	19975000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	18814000	usd
CY2024Q1	wabc	Lihtc Investments LIHTCInvestments	27227000	usd
CY2023Q4	wabc	Lihtc Investments LIHTCInvestments	28667000	usd
CY2024Q1	us-gaap	Interest Receivable Current InterestReceivableCurrent	54000000	usd
CY2023Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	54568000	usd
CY2024Q1	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	4454000	usd
CY2023Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	5200000	usd
CY2024Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	7707000	usd
CY2023Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	9716000	usd
CY2024Q1	us-gaap	Other Assets OtherAssets	295313000	usd
CY2023Q4	us-gaap	Other Assets OtherAssets	297310000	usd
CY2024Q1	wabc	Lihtc Investments LIHTCInvestments	27227000	usd
CY2024Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	14215000	usd
CY2024Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1440000	usd
CY2023Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	-1434000	usd
CY2024Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	975000	usd
CY2023Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	1020000	usd
CY2024Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	19975000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	18814000	usd
CY2024Q1	wabc	Other Liabilities Excluding Operating Lease Liability OtherLiabilitiesExcludingOperatingLeaseLiability	47760000	usd
CY2023Q4	wabc	Other Liabilities Excluding Operating Lease Liability OtherLiabilitiesExcludingOperatingLeaseLiability	40455000	usd
CY2024Q1	us-gaap	Other Liabilities OtherLiabilities	67735000	usd
CY2023Q4	us-gaap	Other Liabilities OtherLiabilities	59269000	usd
CY2024Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	19975000	usd
CY2024Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y3M18D
CY2024Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0311	pure
CY2024Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	1678000	usd
CY2023Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	1656000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	4752000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5681000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4035000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3152000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2412000	usd
CY2024Q1	wabc	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	1407000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	21439000	usd
CY2024Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1464000	usd
CY2024Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	19975000	usd
CY2024Q1	wabc	Amortization Expense Adjustment Resulting From A Change In Estimates Of Useful Lives Or Residual Values AmortizationExpenseAdjustmentResultingFromAChangeInEstimatesOfUsefulLivesOrResidualValues	0	usd
CY2024Q1	us-gaap	Goodwill Goodwill	121673000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	121673000	usd
CY2024Q1	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2514161000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2605844000	usd
CY2024Q1	us-gaap	Demand Deposit Accounts DemandDepositAccounts	1066038000	usd
CY2023Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	1072233000	usd
CY2024Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1681921000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1699388000	usd
CY2024Q1	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	54249000	usd
CY2023Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	56100000	usd
CY2024Q1	wabc	Time Deposits100 Thousand Through250 Thousand TimeDeposits100ThousandThrough250Thousand	29020000	usd
CY2023Q4	wabc	Time Deposits100 Thousand Through250 Thousand TimeDeposits100ThousandThrough250Thousand	31107000	usd
CY2024Q1	wabc	Time Deposits More Than250 Thousand TimeDepositsMoreThan250Thousand	9536000	usd
CY2023Q4	wabc	Time Deposits More Than250 Thousand TimeDepositsMoreThan250Thousand	9595000	usd
CY2024Q1	us-gaap	Deposits Deposits	5354925000	usd
CY2023Q4	us-gaap	Deposits Deposits	5474267000	usd
CY2024Q1	wabc	Demand Deposit Overdrafts DemandDepositOverdrafts	553000	usd
CY2023Q1	wabc	Demand Deposit Overdrafts DemandDepositOverdrafts	620000	usd
CY2024Q1	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	21000	usd
CY2023Q1	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	34000	usd
CY2024Q1	us-gaap	Schedule Of Repurchase Agreements ScheduleOfRepurchaseAgreements	<table border="0" cellpadding="0" cellspacing="0" class="finTable" style="width: 100%; font-size: 10pt; font-family: "Times New Roman", Times, serif; text-indent: 0px;"><tbody><tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">Repurchase Agreements (Sweep)<br/> Accounted for as Secured Borrowings</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">Remaining Contractual Maturity of the Agreements</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">Overnight and Continuous</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">At March 31,</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">At December 31,</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt;"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">2024</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;">2023</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt; width: 70%;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">Repurchase agreements:</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; text-align: center; margin: 0pt;"><em style="font: inherit;"><em style="font: inherit;">(In thousands)</em></em></p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 9pt;">Collateral securing borrowings:</p> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 18pt;">Agency residential MBS</p> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">24,367</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">25,669</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 18pt;">Corporate securities</p> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 12%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);">233,569</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 12%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);">233,947</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt 0pt 0pt 27pt;">Total collateral carrying value</p> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">257,936</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0); margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">259,616</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0); margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; font-family: "Times New Roman", Times, serif; font-size: 10pt; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman", Times, serif; font-size: 10pt;"> <p style="font-family: "Times New Roman", Times, serif; font-size: 10pt; font-variant: normal; margin: 0pt;">Securities sold under repurchase agreements</p> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">50,334</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;">58,162</td><td style="width: 1%; font-family: "Times New Roman", Times, serif; font-size: 10pt; margin-left: 0pt;"> </td></tr> </tbody></table>
CY2024Q1	us-gaap	Carrying Value Of Securities Sold Under Repurchase Agreements And Deposits Received For Securities Loaned CarryingValueOfSecuritiesSoldUnderRepurchaseAgreementsAndDepositsReceivedForSecuritiesLoaned	257936000	usd
CY2023Q4	us-gaap	Carrying Value Of Securities Sold Under Repurchase Agreements And Deposits Received For Securities Loaned CarryingValueOfSecuritiesSoldUnderRepurchaseAgreementsAndDepositsReceivedForSecuritiesLoaned	259616000	usd
CY2024Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	50334000	usd
CY2023Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	58162000	usd
CY2024Q1	wabc	Loan Commitments Not Unconditionally Cancellable LoanCommitmentsNotUnconditionallyCancellable	29635000	usd
CY2023Q4	wabc	Loan Commitments Not Unconditionally Cancellable LoanCommitmentsNotUnconditionallyCancellable	29958000	usd
CY2024Q1	wabc	Unfunded Loan Commitments UnfundedLoanCommitments	212521000	usd
CY2023Q4	wabc	Unfunded Loan Commitments UnfundedLoanCommitments	206028000	usd
CY2024Q1	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	1000000	usd
CY2024Q1	wabc	Loan Commitments Not Unconditionally Cancellable LoanCommitmentsNotUnconditionallyCancellable	29635000	usd
CY2024Q1	us-gaap	Net Income Loss NetIncomeLoss	36417000	usd
CY2023Q1	us-gaap	Net Income Loss NetIncomeLoss	40451000	usd
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26674000
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26859000
CY2024Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.37
CY2023Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.51
CY2024Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26674000
CY2023Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26859000
CY2024Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1000
CY2023Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	7000
CY2024Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26675000
CY2023Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26866000
CY2024Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.37
CY2023Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.51

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Financial_Report.xlsx	Edgar Link	pending
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wabc-20240331.xsd	Edgar Link	pending
wabc20240331_10q.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
wabc-20240331_cal.xml	Edgar Link	unprocessable
wabc-20240331_def.xml	Edgar Link	unprocessable
wabc-20240331_lab.xml	Edgar Link	unprocessable
wabc-20240331_pre.xml	Edgar Link	unprocessable
wabc20240331_10q_htm.xml	Edgar Link	completed

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$WABC
Westamerica Bancorp Stock $wabc

2024 Q2 Form 10-Q Financial Statement

#000117184324002705 Filed on May 09, 2024

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$WABC Westamerica Bancorp Stock $wabc

2024 Q2 Form 10-Q Financial Statement

#000117184324002705 Filed on May 09, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WABC
Westamerica Bancorp Stock $wabc