$WABC
Westamerica Bancorp Stock $wabc

$wabc Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000117184321003146 Filed on May 05, 2021

Income Statement

Concept	2021 Q1	2020 Q1
Revenue	$42.32M	$39.99M
YoY Change	5.81%	1.29%
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	$4.300M	$6.300M
YoY Change	-31.75%	31.25%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$475.0K	$442.0K
YoY Change	7.47%	-10.53%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$27.12M	$22.23M
YoY Change	22.0%	-12.42%
Income Tax	$6.977M	$5.271M
% Of Pretax Income	25.72%	23.71%
Net Earnings	$20.15M	$16.96M
YoY Change	18.78%	-13.66%
Net Earnings / Revenue	47.61%	42.41%
Basic Earnings Per Share	$0.75	$0.63
Diluted Earnings Per Share	$0.75	$0.63
COMMON SHARES
Basic Shares Outstanding	26.82M	27.07M
Diluted Shares Outstanding	26.84M	27.14M

Balance Sheet

Concept	2021 Q1	2020 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$866.5M	$304.6M
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	$32.22M	$35.40M
YoY Change	-9.0%	4.33%
Goodwill	$121.7M	$121.7M
YoY Change	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$14.20M	$14.20M
YoY Change	0.0%	0.0%
Other Assets		$21.00M
YoY Change		-23.08%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$6.912B	$5.628B
YoY Change	22.82%	1.3%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$20.60M	$17.20M
YoY Change	19.77%	-3.91%
Deferred Revenue
YoY Change
Short-Term Debt	$95.48M	$52.66M
YoY Change	81.3%	-9.69%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$20.60M	$17.20M
YoY Change	19.77%	-3.91%
LONG-TERM LIABILITIES
Long-Term Debt	$1.700M	$0.00
YoY Change
Other Long-Term Liabilities	$52.50M	$53.20M
YoY Change	-1.32%	75.0%
Total Long-Term Liabilities	$54.20M	$53.20M
YoY Change	1.88%	75.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$20.60M	$17.20M
Total Long-Term Liabilities	$54.20M	$53.20M
Total Liabilities	$6.100B	$4.923B
YoY Change	23.93%	0.48%
SHAREHOLDERS EQUITY
Retained Earnings	$273.3M	$238.9M
YoY Change	14.42%	12.72%
Common Stock	$469.9M	$465.7M
YoY Change	0.89%	2.28%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$812.1M	$705.5M
YoY Change
Total Liabilities & Shareholders Equity	$6.912B	$5.628B
YoY Change	22.82%	1.3%

Cashflow Statement

Concept	2021 Q1	2020 Q1
OPERATING ACTIVITIES
Net Income	$20.15M	$16.96M
YoY Change	18.78%	-13.66%
Depreciation, Depletion And Amortization	$4.300M	$6.300M
YoY Change	-31.75%	31.25%
Cash From Operating Activities	$32.27M	$54.45M
YoY Change	-40.73%	132.33%
INVESTING ACTIVITIES
Capital Expenditures	$145.0K	$1.796M
YoY Change	-91.93%	357.0%
Acquisitions
YoY Change
Other Investing Activities	-$9.200M	-$111.9M
YoY Change	-91.78%	-321.15%
Cash From Investing Activities	-$9.296M	-$113.7M
YoY Change	-91.82%	-326.38%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net	$232.0K	$9.247M
YoY Change	-97.49%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$222.2M	-$9.544M
YoY Change	-2428.23%	-86.77%
NET CHANGE
Cash From Operating Activities	$32.27M	$54.45M
Cash From Investing Activities	-$9.296M	-$113.7M
Cash From Financing Activities	$222.2M	-$9.544M
Net Change In Cash	$245.2M	-$68.79M
YoY Change	-456.41%	-4674.0%
FREE CASH FLOW
Cash From Operating Activities	$32.27M	$54.45M
Capital Expenditures	$145.0K	$1.796M
Free Cash Flow	$32.13M	$52.66M
YoY Change	-38.99%	128.5%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021Q1	wabc	High Risk Collateralized Mortgage Obligations HighRiskCollateralizedMortgageObligations	0	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	9000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	9000	USD
CY2021Q1	wabc	Debt Securities Heldtomaturity Fair Value Net DebtSecuritiesHeldtomaturityFairValueNet	480549000	USD
CY2020Q4	wabc	Debt Securities Heldtomaturity Fair Value Net DebtSecuritiesHeldtomaturityFairValueNet	529678000	USD
CY2021Q1	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q1	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2020Q4	us-gaap	Common Stock No Par Value CommonStockNoParValue	0
CY2021Q1	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000
CY2021Q2	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	26865423
CY2021Q1	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	26864000
CY2021Q1	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	26864000
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	26807000
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	26807000
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.41
CY2021Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.41
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2725177000	USD
CY2021Q1	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	3125291000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	121673000	USD
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities Domestic InterestBearingDepositLiabilitiesDomestic	2962802000	USD
CY2021Q1	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2798542000	USD
CY2021Q1	us-gaap	Other Than Temporary Impairment Loss Debt Securities Available For Sale OtherThanTemporaryImpairmentLossDebtSecuritiesAvailableForSale	0	USD
CY2020Q4	wabc	Loans And Leases Receivable Nonaccrual Commitment To Lend LoansAndLeasesReceivableNonaccrualCommitmentToLend	0	USD
CY2021Q1	wabc	Troubled Debt Restructurings During Period TroubledDebtRestructuringsDuringPeriod	0	pure
CY2020Q1	wabc	Troubled Debt Restructurings During Period TroubledDebtRestructuringsDuringPeriod	0	pure
CY2020Q1	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2020Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2020Q4	wabc	Other Real Estate Reserve OtherRealEstateReserve	0	USD
CY2021Q1	us-gaap	Lessee Operating Lease Term Of Contract LesseeOperatingLeaseTermOfContract	P5Y
CY2021Q1	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
CY2021Q1	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	us-gaap	Goodwill And Intangible Asset Impairment GoodwillAndIntangibleAssetImpairment	0	USD
CY2020	wabc	Amortization Expense Adjustment Resulting From A Change In Estimates Of Useful Lives Or Residual Values AmortizationExpenseAdjustmentResultingFromAChangeInEstimatesOfUsefulLivesOrResidualValues	0	USD
CY2021Q1	wabc	Amortization Expense Adjustment Resulting From A Change In Estimates Of Useful Lives Or Residual Values AmortizationExpenseAdjustmentResultingFromAChangeInEstimatesOfUsefulLivesOrResidualValues	0	USD
CY2020Q4	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	580000	USD
CY2021Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	866457000	USD
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	621275000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3990570000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4063185000	USD
CY2021Q1	wabc	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	469259000	USD
CY2020Q4	wabc	Held To Maturity Securities Net HeldToMaturitySecuritiesNet	515589000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	1293756000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1256243000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23483000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23854000	USD
CY2021Q1	us-gaap	Notes Receivable Net NotesReceivableNet	1270273000	USD
CY2020Q4	us-gaap	Notes Receivable Net NotesReceivableNet	1232389000	USD
CY2021Q1	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	32216000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	32813000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1035000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1104000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	121673000	USD
CY2021Q1	us-gaap	Other Assets OtherAssets	160998000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	159903000	USD
CY2021Q1	us-gaap	Assets Assets	6912481000	USD
CY2020Q4	us-gaap	Assets Assets	6747931000	USD
CY2021Q1	us-gaap	Deposits Deposits	5923833000	USD
CY2020Q4	us-gaap	Deposits Deposits	5687979000	USD
CY2021Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	95479000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	102545000	USD
CY2021Q1	us-gaap	Other Long Term Debt OtherLongTermDebt	1681000	USD
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	0	USD
CY2021Q1	us-gaap	Other Liabilities OtherLiabilities	79356000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	112598000	USD
CY2021Q1	us-gaap	Liabilities Liabilities	6100349000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	5903122000	USD
CY2021Q1	us-gaap	Common Stock Value CommonStockValue	469850000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	466006000	USD
CY2021Q1	wabc	Deferred Compensation DeferredCompensation	35000	USD
CY2021Q1	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	68901000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	114412000	USD
CY2020Q4	wabc	Deferred Compensation DeferredCompensation	35000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	69000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	73000	USD
CY2020Q1	wabc	Contract Courier Expense ContractCourierExpense	491000	USD
CY2021Q1	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	273346000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	264356000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	812132000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	844809000	USD
CY2021Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6912481000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	6747931000	USD
CY2021Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	14581000	USD
CY2020Q1	us-gaap	Interest And Fee Income Loans And Leases Held In Portfolio InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio	13809000	USD
CY2021Q1	wabc	Interest And Dividend Income Equity Securities Operating InterestAndDividendIncomeEquitySecuritiesOperating	110000	USD
CY2020Q1	wabc	Interest And Dividend Income Equity Securities Operating InterestAndDividendIncomeEquitySecuritiesOperating	103000	USD
CY2021Q1	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	24889000	USD
CY2020Q1	us-gaap	Interest Income Debt Securities Available For Sale Operating InterestIncomeDebtSecuritiesAvailableForSaleOperating	21315000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	2598000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Securities Held To Maturity InterestAndDividendIncomeSecuritiesHeldToMaturity	3908000	USD
CY2021Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	138000	USD
CY2020Q1	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	856000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	42316000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	39991000	USD
CY2021Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	459000	USD
CY2020Q1	us-gaap	Interest Expense Deposits InterestExpenseDeposits	434000	USD
CY2021Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	16000	USD
CY2020Q1	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	8000	USD
CY2021Q1	us-gaap	Interest Expense InterestExpense	475000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	442000	USD
CY2021Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	41841000	USD
CY2020Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	39549000	USD
CY2021Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2020Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4300000	USD
CY2021Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	41841000	USD
CY2020Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	35249000	USD
CY2021Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	783000	USD
CY2020Q1	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1587000	USD
CY2021Q1	us-gaap	Noninterest Income NoninterestIncome	10189000	USD
CY2020Q1	us-gaap	Noninterest Income NoninterestIncome	11648000	USD
CY2021Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	12665000	USD
CY2020Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	13018000	USD
CY2021Q1	us-gaap	Occupancy Net OccupancyNet	4880000	USD
CY2020Q1	us-gaap	Occupancy Net OccupancyNet	4932000	USD
CY2021Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2390000	USD
CY2020Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2405000	USD
CY2021Q1	us-gaap	Professional Fees ProfessionalFees	942000	USD
CY2020Q1	us-gaap	Professional Fees ProfessionalFees	389000	USD
CY2021Q1	wabc	Contract Courier Expense ContractCourierExpense	504000	USD
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3456000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3356000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	24906000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	24664000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	27124000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	22233000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6977000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-36744000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-19103000	USD
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CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	5271000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20147000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	16962000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26821000
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CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26842000
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CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63
CY2021Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.41
CY2020Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.41
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20147000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	16962000	USD
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CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-25364000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-8918000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	731417000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	16962000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-25880000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2266000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	534000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	525000	USD
CY2020Q1	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	21000	USD
CY2020Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	9247000	USD
CY2020Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	11104000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	705546000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	844809000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20147000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-45511000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2960000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	526000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Share Based Compensation Gross StockIssuedDuringPeriodValueShareBasedCompensationGross	368000	USD
CY2021Q1	us-gaap	Stock Granted During Period Value Sharebased Compensation StockGrantedDuringPeriodValueSharebasedCompensation	56000	USD
CY2021Q1	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	232000	USD
CY2021Q1	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	10991000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	812132000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20147000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	16962000	USD
CY2021Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	4256000	USD
CY2020Q1	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	6304000	USD
CY2021Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	0	USD
CY2020Q1	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	4300000	USD
CY2021Q1	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	1246000	USD
CY2020Q1	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	18000	USD
CY2021Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-1961000	USD
CY2020Q1	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	201000	USD
CY2021Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-7450000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	222206000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-9544000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	245182000	USD
CY2020Q1	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-4572000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-68793000	USD
CY2020Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2266000	USD
CY2021Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	232000	USD
CY2020Q1	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	9247000	USD
CY2021Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10991000	USD
CY2020Q1	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11104000	USD
CY2021Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	472000	USD
CY2020Q1	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-879000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3004000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3625000	USD
CY2021Q1	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	368000	USD
CY2020Q1	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	525000	USD
CY2021Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	16000	USD
CY2020Q1	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	10000	USD
CY2021Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2796000	USD
CY2020Q1	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	24743000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	32272000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	54451000	USD
CY2021Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	36544000	USD
CY2020Q1	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	-4545000	USD
CY2021Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	385553000	USD
CY2020Q1	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	438122000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	367499000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	266561000	USD
CY2021Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	45447000	USD
CY2020Q1	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	55112000	USD
CY2021Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	145000	USD
CY2020Q1	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1796000	USD
CY2021Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-9296000	USD
CY2020Q1	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-113700000	USD
CY2021Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	235854000	USD
CY2020Q1	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-13195000	USD
CY2021Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-5385000	USD
CY2020Q1	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	21736000	USD
CY2021Q1	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	2960000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	621275000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	373421000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	866457000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	304628000	USD
CY2021Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	3301000	USD
CY2020Q1	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	USD
CY2021Q1	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	5000000	USD
CY2020Q1	us-gaap	Other Significant Noncash Transaction Value Of Consideration Given1 OtherSignificantNoncashTransactionValueOfConsiderationGiven1	607000	USD
CY2021Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1618000	USD
CY2020Q1	us-gaap	Operating Lease Payments OperatingLeasePayments	1659000	USD
CY2021Q1	us-gaap	Interest Paid Net InterestPaidNet	459000	USD
CY2020Q1	us-gaap	Interest Paid Net InterestPaidNet	432000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	-7000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	9000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3892750000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	105578000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	7758000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3990570000	USD
CY2021Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	469268000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	11316000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	26000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	480558000	USD
CY2021Q1	wabc	Debt Securities Availableforsale And Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleAndHeldtomaturityAmortizedCost	4362018000	USD
CY2021Q1	wabc	Debt Securities Gross Unrecognized Gains DebtSecuritiesGrossUnrecognizedGains	116894000	USD
CY2021Q1	wabc	Debt Securities Gross Unrecognized Losses DebtSecuritiesGrossUnrecognizedLosses	7784000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	4471128000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3900751000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	163576000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1142000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4063185000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	515598000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	14121000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	32000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	529687000	USD
CY2020Q4	wabc	Debt Securities Availableforsale And Heldtomaturity Amortized Cost DebtSecuritiesAvailableforsaleAndHeldtomaturityAmortizedCost	4416349000	USD
CY2020Q4	wabc	Debt Securities Gross Unrecognized Gains DebtSecuritiesGrossUnrecognizedGains	177697000	USD
CY2020Q4	wabc	Debt Securities Gross Unrecognized Losses DebtSecuritiesGrossUnrecognizedLosses	1174000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity DebtSecuritiesAvailableForSaleAndHeldToMaturity	4592872000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	222016000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	224112000	USD
CY2021Q1	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	49319000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	49593000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	851915000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	894939000	USD
CY2021Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	129579000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	132526000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1829139000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1861379000	USD
CY2021Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	76641000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	79103000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	431314000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	432650000	USD
CY2021Q1	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	0	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	0	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3334384000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	3413080000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	255539000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	261222000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	558366000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	577490000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount	213729000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	219336000	USD
CY2021Q1	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3892750000	USD
CY2021Q1	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	3990570000	USD
CY2021Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	469268000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	480558000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	212140000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	213715000	USD
CY2020Q4	us-gaap	Heldtomaturity Securities Debt Maturities Next Rolling Twelve Months Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCost	54526000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	54927000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	922170000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	974438000	USD
CY2020Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Two Through Five Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCost	129786000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	133195000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1767747000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1851184000	USD
CY2020Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling Year Six Through Ten Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCost	89610000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	93043000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	368520000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	370896000	USD
CY2020Q4	us-gaap	Heldtomaturity Securities Debt Maturities Rolling After Ten Years Amortized Cost HeldtomaturitySecuritiesDebtMaturitiesRollingAfterTenYearsAmortizedCost	0	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount	241676000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	652952000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	0	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date Amortized Cost Basis AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	3270577000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Single Maturity Date AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate	3410233000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	273922000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	281165000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Maturities Without Single Maturity Date Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost	630174000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Debt Maturities Without Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue	248522000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	3900751000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	4063185000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	515598000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	529687000	USD
CY2020Q4	wabc	High Risk Collateralized Mortgage Obligations HighRiskCollateralizedMortgageObligations	0	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	75	pure
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	572382000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7737000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	2	pure
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	14996000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	21000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	77	pure
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	587378000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	7758000	USD
CY2021Q1	wabc	Heldtomaturity Securities Less Than12 Months Number Of Positions HeldtomaturitySecuritiesLessThan12MonthsNumberOfPositions	3	pure
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	880000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	7000	USD
CY2021Q1	wabc	Heldtomaturity Securities12 Months Or Longer Number Of Positions HeldtomaturitySecurities12MonthsOrLongerNumberOfPositions	3	pure
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	686000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	19000	USD
CY2021Q1	wabc	Heldtomaturity Securities In Unrealized Loss Positions Qualitative Disclosure Number Of Positions1 HeldtomaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1	6	pure
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	1566000	USD
CY2021Q1	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	26000	USD
CY2021Q1	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	844502000	USD
CY2020Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	888577000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	40	pure
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	269526000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1100000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	2	pure
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	14980000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	42000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	42	pure
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	284506000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1142000	USD
CY2020Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	9000	USD
CY2019Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	0	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Writeoff DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff	0	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0	USD
CY2020Q1	us-gaap	Debt Securities Held To Maturity Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityCreditLossExpenseReversal	0	USD
CY2020Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	21964000	USD
CY2020Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	25326000	USD
CY2021Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	2399000	USD
CY2020Q1	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	3362000	USD
CY2021Q1	us-gaap	Interest And Dividend Income Securities InterestAndDividendIncomeSecurities	27597000	USD
CY2020Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Writeoff DebtSecuritiesHeldToMaturityAllowanceForCreditLossWriteoff	0	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	0	USD
CY2020Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Recovery DebtSecuritiesHeldToMaturityAllowanceForCreditLossRecovery	0	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	9000	USD
CY2020Q1	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss DebtSecuritiesHeldToMaturityAllowanceForCreditLoss	16000	USD
CY2021Q1	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	469268000	USD
CY2021Q1	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0	USD
CY2021Q1	us-gaap	Interest Income Securities Taxable InterestIncomeSecuritiesTaxable	25198000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	1293756000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1256243000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23854000	USD
CY2021Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	0	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	929000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	558000	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	23483000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	19484000	USD
CY2020Q1	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	4300000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1573000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	576000	USD
CY2020Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	24804000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	1293756000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1256243000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1284801000	USD
CY2021Q1	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	3971000	USD
CY2021Q1	us-gaap	Notes Receivable Gross NotesReceivableGross	1293756000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1247222000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	4329000	USD
CY2020Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1256243000	USD
CY2021Q1	wabc	Loans And Leases Receivable Nonaccrual Commitment To Lend LoansAndLeasesReceivableNonaccrualCommitmentToLend	0	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	5	pure
CY2021Q1	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	7786000	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	5227000	USD
CY2021Q1	wabc	Financing Receivable Modifications Period End Impairment Allowance FinancingReceivableModificationsPeriodEndImpairmentAllowance	0	USD
CY2020	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	7	pure
CY2020	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	8608000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	6221000	USD
CY2020Q4	wabc	Financing Receivable Modifications Period End Impairment Allowance FinancingReceivableModificationsPeriodEndImpairmentAllowance	0	USD
CY2021Q1	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	0	USD
CY2021Q1	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2021Q1	wabc	Other Real Estate Reserve OtherRealEstateReserve	0	USD
CY2021Q1	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	365000	USD
CY2020Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	346000	USD
CY2021Q1	wabc	Unsecured Loan Limit Percentage Of Shareholders Equity California Financial Code UnsecuredLoanLimitPercentageOfShareholdersEquityCaliforniaFinancialCode	0.15	pure
CY2021Q1	wabc	Secured And Unsecured Loan Limit Percentage California Financial Code SecuredAndUnsecuredLoanLimitPercentageCaliforniaFinancialCode	0.25	pure
CY2021Q1	wabc	Loan Commitments Related To Real Estate Loans LoanCommitmentsRelatedToRealEstateLoans	36082000	USD
CY2020Q4	wabc	Loan Commitments Related To Real Estate Loans LoanCommitmentsRelatedToRealEstateLoans	37456000	USD
CY2021Q1	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14069000	USD
CY2020Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	14069000	USD
CY2021Q1	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	158000	USD
CY2020Q4	us-gaap	Other Investments And Securities At Cost OtherInvestmentsAndSecuritiesAtCost	158000	USD
CY2021Q1	us-gaap	Cost Method Investments CostMethodInvestments	14227000	USD
CY2020Q4	us-gaap	Cost Method Investments CostMethodInvestments	14227000	USD
CY2021Q1	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	61070000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	60444000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	20609000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	18832000	USD
CY2021Q1	wabc	Lihtc Investments LIHTCInvestments	17637000	USD
CY2020Q4	wabc	Lihtc Investments LIHTCInvestments	18335000	USD
CY2020Q4	us-gaap	Interest Receivable Current InterestReceivableCurrent	33022000	USD
CY2021Q1	us-gaap	Interest Receivable Current InterestReceivableCurrent	31061000	USD
CY2021Q1	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	4197000	USD
CY2020Q4	us-gaap	Prepaid Expense Current And Noncurrent PrepaidExpenseCurrentAndNoncurrent	4572000	USD
CY2021Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	200000	USD
CY2021Q1	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	6204000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	25778000	USD
CY2021Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	12197000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	20609000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	18832000	USD
CY2020Q1	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	225000	USD
CY2021Q1	wabc	Securities Purchases Pending Settlement SecuritiesPurchasesPendingSettlement	5000000	USD
CY2020Q4	wabc	Securities Purchases Pending Settlement SecuritiesPurchasesPendingSettlement	29000000	USD
CY2021Q1	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	47543000	USD
CY2020Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	10471000	USD
CY2021Q1	us-gaap	Other Assets OtherAssets	160998000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	159903000	USD
CY2021Q1	wabc	Lihtc Investments LIHTCInvestments	17637000	USD
CY2021Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	11240000	USD
CY2020Q4	wabc	Lihtc Investments LIHTCInvestments	18335000	USD
CY2020Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	12202000	USD
CY2021Q1	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	11240000	USD
CY2021Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	600000	USD
CY2020Q1	us-gaap	Income Loss From Affordable Housing Projects Equity Method Investments IncomeLossFromAffordableHousingProjectsEquityMethodInvestments	600000	USD
CY2020Q4	us-gaap	Other Sundry Liabilities OtherSundryLiabilities	38988000	USD
CY2021Q1	us-gaap	Other Liabilities OtherLiabilities	79356000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	112598000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	6204000	USD
CY2021Q1	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-22715000	USD
CY2021Q1	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	28919000	USD
CY2021Q1	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	97820000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	25778000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-22805000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	48021000	USD
CY2020	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	162434000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	20609000	USD
CY2021Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	20609000	USD
CY2021Q1	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y7M6D
CY2021Q1	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0183	pure
CY2021Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	1654000	USD
CY2020Q1	us-gaap	Operating Lease Cost OperatingLeaseCost	1659000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	4503000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	5331000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	4619000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	3025000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	1795000	USD
CY2021Q1	wabc	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	2114000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	21387000	USD
CY2021Q1	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	778000	USD
CY2021Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	20609000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	121673000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	121673000	USD
CY2021Q1	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2798542000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities Domestic NoninterestBearingDepositLiabilitiesDomestic	2725177000	USD
CY2021Q1	us-gaap	Demand Deposit Accounts DemandDepositAccounts	1179484000	USD
CY2020Q4	us-gaap	Demand Deposit Accounts DemandDepositAccounts	1102601000	USD
CY2021Q1	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1791636000	USD
CY2020Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1703812000	USD
CY2021Q1	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	78180000	USD
CY2020Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	79825000	USD
CY2021Q1	wabc	Time Deposits100 Thousand Through250 Thousand TimeDeposits100ThousandThrough250Thousand	49657000	USD
CY2020Q4	wabc	Time Deposits100 Thousand Through250 Thousand TimeDeposits100ThousandThrough250Thousand	49323000	USD
CY2021Q1	wabc	Time Deposits More Than250 Thousand TimeDepositsMoreThan250Thousand	26334000	USD
CY2020Q4	wabc	Time Deposits More Than250 Thousand TimeDepositsMoreThan250Thousand	27241000	USD
CY2021Q1	us-gaap	Deposits Deposits	5923833000	USD
CY2020Q4	us-gaap	Deposits Deposits	5687979000	USD
CY2021Q1	wabc	Demand Deposit Overdrafts DemandDepositOverdrafts	1194000	USD
CY2020Q4	wabc	Demand Deposit Overdrafts DemandDepositOverdrafts	682000	USD
CY2021Q1	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	78000	USD
CY2020Q1	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	79000	USD
CY2021Q1	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"; text-indent: 0px;"><tbody><tr style="vertical-align: bottom;"><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;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"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom;"><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;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"; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom;"><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">Overnight and Continuous</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom;"><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">At March 31,</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">At December 31,</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom;"><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">2021</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="2" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> <p style="font-family:Times New Roman;font-size:10pt;font-variant:normal;text-align:center;margin:0pt;">2020</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt; width: 70%;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Repurchase agreements:</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td colspan="6" style="text-align: center; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> <p style="font-family:Times New Roman;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"; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 9pt;">Collateral securing borrowings:</p> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="font-family: "Times New Roman"; font-size: 10pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Agency residential MBS</p> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">58,799</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">67,019</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 18pt;">Corporate securities</p> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; padding-bottom: 1px;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 12%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);">181,119</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; padding-bottom: 1px;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td><td style="width: 12%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; text-align: right; border-bottom: 1px solid rgb(0, 0, 0);">188,195</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 1px solid rgb(0, 0, 0);"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(204, 238, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt; margin-left: 27pt;">Total collateral carrying value</p> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">239,918</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0); margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt; border-bottom: 3px double rgb(0, 0, 0);">255,214</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; border-bottom: 3px double rgb(0, 0, 0); margin-left: 0pt;"> </td></tr> <tr style="vertical-align: bottom; background-color: rgb(255, 255, 255);"><td style="font-family: "Times New Roman"; font-size: 10pt;"> <p style="font-family: "Times New Roman"; font-size: 10pt; font-variant: normal; margin-top: 0pt; margin-bottom: 0pt;">Total short-term borrowed funds</p> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">95,479</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt;"> </td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">$</td><td style="width: 12%; text-align: right; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;">102,545</td><td style="width: 1%; font-family: "Times New Roman"; font-size: 10pt; margin-left: 0pt;"> </td></tr> </tbody></table>
CY2021Q1	us-gaap	Carrying Value Of Securities Sold Under Repurchase Agreements And Deposits Received For Securities Loaned CarryingValueOfSecuritiesSoldUnderRepurchaseAgreementsAndDepositsReceivedForSecuritiesLoaned	239918000	USD
CY2020Q4	us-gaap	Carrying Value Of Securities Sold Under Repurchase Agreements And Deposits Received For Securities Loaned CarryingValueOfSecuritiesSoldUnderRepurchaseAgreementsAndDepositsReceivedForSecuritiesLoaned	255214000	USD
CY2021Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	95479000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	102545000	USD
CY2021Q1	wabc	Loan Commitments Not Unconditionally Cancellable LoanCommitmentsNotUnconditionallyCancellable	36082000	USD
CY2021Q1	wabc	Unfunded Loan Commitments UnfundedLoanCommitments	264131000	USD
CY2020Q4	wabc	Unfunded Loan Commitments UnfundedLoanCommitments	277878000	USD
CY2021Q1	us-gaap	Guarantee Obligations Current Carrying Value GuaranteeObligationsCurrentCarryingValue	580000	USD
CY2021Q1	wabc	Loan Commitments Not Unconditionally Cancellable LoanCommitmentsNotUnconditionallyCancellable	36082000	USD
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27068000
CY2021Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	21000
CY2020Q1	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	71000
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	26842000
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	20147000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	16962000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26821000
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	27068000
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.63
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	26821000
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	27139000
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.63

Files In Submission

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0001171843-21-003146-index-headers.html	Edgar Link	pending
0001171843-21-003146-index.html	Edgar Link	pending
0001171843-21-003146.txt	Edgar Link	pending
0001171843-21-003146-xbrl.zip	Edgar Link	pending
ex_245770.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
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wabc-20210331.xsd	Edgar Link	pending
wabc-20210331_cal.xml	Edgar Link	unprocessable
wabc-20210331_def.xml	Edgar Link	unprocessable
wabc-20210331_lab.xml	Edgar Link	unprocessable
wabc-20210331_pre.xml	Edgar Link	unprocessable
wabc20210331_10q.htm	Edgar Link	pending
wabc20210331_10q_htm.xml	Edgar Link	completed

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$WABC
Westamerica Bancorp Stock $wabc

2021 Q1 Form 10-Q Financial Statement

#000117184321003146 Filed on May 05, 2021

Income Statement

Balance Sheet

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$WABC Westamerica Bancorp Stock $wabc

2021 Q1 Form 10-Q Financial Statement

#000117184321003146 Filed on May 05, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$WABC
Westamerica Bancorp Stock $wabc