3.22.4 html 420 518 1 false 85 0 false 9 false false R1.htm 0000001 - Document - Cover Sheet http://westbankiowa.com/role/Cover Cover Cover 1 false false R2.htm 0000002 - Statement - Consolidated Balance Sheets Sheet http://westbankiowa.com/role/ConsolidatedBalanceSheets Consolidated Balance Sheets Statements 2 false false R3.htm 0000003 - Statement - Consolidated Balance Sheets (Parentheticals) Sheet http://westbankiowa.com/role/ConsolidatedBalanceSheetsParentheticals Consolidated Balance Sheets (Parentheticals) Statements 3 false false R4.htm 0000004 - Statement - Consolidated Statements of Income Sheet http://westbankiowa.com/role/ConsolidatedStatementsofIncome Consolidated Statements of Income Statements 4 false false R5.htm 0000005 - Statement - Consolidated Statements of Comprehensive Income Sheet http://westbankiowa.com/role/ConsolidatedStatementsofComprehensiveIncome Consolidated Statements of Comprehensive Income Statements 5 false false R6.htm 0000006 - Statement - Consolidated Statements of Stockholders' Equity Sheet http://westbankiowa.com/role/ConsolidatedStatementsofStockholdersEquity Consolidated Statements of Stockholders' Equity Statements 6 false false R7.htm 0000007 - Statement - Consolidated Statements of Stockholders' Equity (Parentheticals) Sheet http://westbankiowa.com/role/ConsolidatedStatementsofStockholdersEquityParentheticals Consolidated Statements of Stockholders' Equity (Parentheticals) Statements 7 false false R8.htm 0000008 - Statement - Consolidated Statements of Cash Flows Sheet http://westbankiowa.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 8 false false R9.htm 0000009 - Statement - Subordinated Debt (Notes) Notes http://westbankiowa.com/role/SubordinatedDebtNotes Subordinated Debt (Notes) Statements 9 false false R10.htm 0000010 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Notes) Notes http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesNotes Organization and Nature of Business and Summary of Significant Accounting Policies (Notes) Notes 10 false false R11.htm 0000011 - Disclosure - Earnings per Common Share (Notes) Notes http://westbankiowa.com/role/EarningsperCommonShareNotes Earnings per Common Share (Notes) Notes 11 false false R12.htm 0000012 - Disclosure - Investment securities (Notes) Notes http://westbankiowa.com/role/InvestmentsecuritiesNotes Investment securities (Notes) Notes 12 false false R13.htm 0000013 - Disclosure - Loans and Allowance for Loan Losses (Notes) Notes http://westbankiowa.com/role/LoansandAllowanceforLoanLossesNotes Loans and Allowance for Loan Losses (Notes) Notes 13 false false R14.htm 0000014 - Disclosure - Premises and Equipment, Net (Notes) Notes http://westbankiowa.com/role/PremisesandEquipmentNetNotes Premises and Equipment, Net (Notes) Notes 14 false false R15.htm 0000015 - Disclosure - Operating Leases Operating Leases (Notes) Notes http://westbankiowa.com/role/OperatingLeasesOperatingLeasesNotes Operating Leases Operating Leases (Notes) Notes 15 false false R16.htm 0000016 - Disclosure - Deposits (Notes) Notes http://westbankiowa.com/role/DepositsNotes Deposits (Notes) Notes 16 false false R17.htm 0000017 - Disclosure - Federal Home Loan Bank Advances (Notes) Notes http://westbankiowa.com/role/FederalHomeLoanBankAdvancesNotes Federal Home Loan Bank Advances (Notes) Notes 17 false false R18.htm 0000018 - Disclosure - Long-term debt (Notes) Notes http://westbankiowa.com/role/LongtermdebtNotes Long-term debt (Notes) Notes 18 false false R19.htm 0000019 - Disclosure - Derivatives (Notes) Notes http://westbankiowa.com/role/DerivativesNotes Derivatives (Notes) Notes 19 false false R20.htm 0000020 - Disclosure - Income Taxes (Notes) Notes http://westbankiowa.com/role/IncomeTaxesNotes Income Taxes (Notes) Notes 20 false false R21.htm 0000021 - Disclosure - Stock Compensation Plans (Notes) Notes http://westbankiowa.com/role/StockCompensationPlansNotes Stock Compensation Plans (Notes) Notes 21 false false R22.htm 0000022 - Disclosure - Employee Savings and Stock Ownership Plan (Notes) Notes http://westbankiowa.com/role/EmployeeSavingsandStockOwnershipPlanNotes Employee Savings and Stock Ownership Plan (Notes) Notes 22 false false R23.htm 0000023 - Disclosure - Accumulated Other Comprehensive Income (Notes) Notes http://westbankiowa.com/role/AccumulatedOtherComprehensiveIncomeNotes Accumulated Other Comprehensive Income (Notes) Notes 23 false false R24.htm 0000024 - Disclosure - Regulatory Capital Requirements (Notes) Notes http://westbankiowa.com/role/RegulatoryCapitalRequirementsNotes Regulatory Capital Requirements (Notes) Notes 24 false false R25.htm 0000025 - Disclosure - Commitments and Contingencies (Notes) Notes http://westbankiowa.com/role/CommitmentsandContingenciesNotes Commitments and Contingencies (Notes) Notes 25 false false R26.htm 0000026 - Disclosure - Fair Value Measurements (Notes) Notes http://westbankiowa.com/role/FairValueMeasurementsNotes Fair Value Measurements (Notes) Notes 26 false false R27.htm 0000027 - Disclosure - West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Notes) Notes http://westbankiowa.com/role/WestBancorporationIncParentCompanyOnlyCondensedFinancialStatementsNotes West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Notes) Notes 27 false false R28.htm 0000028 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Policies) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies Organization and Nature of Business and Summary of Significant Accounting Policies (Policies) Policies http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesNotes 28 false false R29.htm 0000029 - Disclosure - Earnings per Common Share (Tables) Sheet http://westbankiowa.com/role/EarningsperCommonShareTables Earnings per Common Share (Tables) Tables http://westbankiowa.com/role/EarningsperCommonShareNotes 29 false false R30.htm 0000030 - Disclosure - Investment securities (Tables) Sheet http://westbankiowa.com/role/InvestmentsecuritiesTables Investment securities (Tables) Tables http://westbankiowa.com/role/InvestmentsecuritiesNotes 30 false false R31.htm 0000031 - Disclosure - Loans and Allowance for Loan Losses (Tables) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesTables Loans and Allowance for Loan Losses (Tables) Tables http://westbankiowa.com/role/LoansandAllowanceforLoanLossesNotes 31 false false R32.htm 0000032 - Disclosure - Premises and Equipment, Net (Tables) Sheet http://westbankiowa.com/role/PremisesandEquipmentNetTables Premises and Equipment, Net (Tables) Tables http://westbankiowa.com/role/PremisesandEquipmentNetNotes 32 false false R33.htm 0000033 - Disclosure - Operating Leases Operating Leases (Tables) Sheet http://westbankiowa.com/role/OperatingLeasesOperatingLeasesTables Operating Leases Operating Leases (Tables) Tables http://westbankiowa.com/role/OperatingLeasesOperatingLeasesNotes 33 false false R34.htm 0000034 - Disclosure - Deposits (Tables) Sheet http://westbankiowa.com/role/DepositsTables Deposits (Tables) Tables http://westbankiowa.com/role/DepositsNotes 34 false false R35.htm 0000035 - Disclosure - Long-term debt (Tables) Sheet http://westbankiowa.com/role/LongtermdebtTables Long-term debt (Tables) Tables http://westbankiowa.com/role/LongtermdebtNotes 35 false false R36.htm 0000036 - Disclosure - Derivatives (Tables) Sheet http://westbankiowa.com/role/DerivativesTables Derivatives (Tables) Tables http://westbankiowa.com/role/DerivativesNotes 36 false false R37.htm 0000037 - Disclosure - Income Taxes (Tables) Sheet http://westbankiowa.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://westbankiowa.com/role/IncomeTaxesNotes 37 false false R38.htm 0000038 - Disclosure - Stock Compensation Plans (Tables) Sheet http://westbankiowa.com/role/StockCompensationPlansTables Stock Compensation Plans (Tables) Tables http://westbankiowa.com/role/StockCompensationPlansNotes 38 false false R39.htm 0000039 - Disclosure - Accumulated Other Comprehensive Income (Tables) Sheet http://westbankiowa.com/role/AccumulatedOtherComprehensiveIncomeTables Accumulated Other Comprehensive Income (Tables) Tables http://westbankiowa.com/role/AccumulatedOtherComprehensiveIncomeNotes 39 false false R40.htm 0000040 - Disclosure - Regulatory Capital Requirements (Tables) Sheet http://westbankiowa.com/role/RegulatoryCapitalRequirementsTables Regulatory Capital Requirements (Tables) Tables http://westbankiowa.com/role/RegulatoryCapitalRequirementsNotes 40 false false R41.htm 0000041 - Disclosure - Commitments and Contingencies (Tables) Sheet http://westbankiowa.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://westbankiowa.com/role/CommitmentsandContingenciesNotes 41 false false R42.htm 0000042 - Disclosure - Fair Value Measurements (Tables) Sheet http://westbankiowa.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://westbankiowa.com/role/FairValueMeasurementsNotes 42 false false R43.htm 0000043 - Disclosure - West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Tables) Sheet http://westbankiowa.com/role/WestBancorporationIncParentCompanyOnlyCondensedFinancialStatementsTables West Bancorporation, Inc. (Parent Company Only) Condensed Financial Statements (Tables) Tables http://westbankiowa.com/role/WestBancorporationIncParentCompanyOnlyCondensedFinancialStatementsNotes 43 false false R44.htm 0000044 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Branches) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesBranchesDetails Organization and Nature of Business and Summary of Significant Accounting Policies (Branches) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 44 false false R45.htm 0000045 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (FHLB stock) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesFHLBstockDetails Organization and Nature of Business and Summary of Significant Accounting Policies (FHLB stock) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 45 false false R46.htm 0000046 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Useful Lives) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesUsefulLivesDetails Organization and Nature of Business and Summary of Significant Accounting Policies (Useful Lives) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 46 false false R47.htm 0000047 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (OREO) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesOREODetails Organization and Nature of Business and Summary of Significant Accounting Policies (OREO) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 47 false false R48.htm 0000048 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Trust assets) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesTrustassetsDetails Organization and Nature of Business and Summary of Significant Accounting Policies (Trust assets) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 48 false false R49.htm 0000049 - Disclosure - Organization and Nature of Business and Summary of Significant Accounting Policies (Deferred Compensation) (Details) Sheet http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesDeferredCompensationDetails Organization and Nature of Business and Summary of Significant Accounting Policies (Deferred Compensation) (Details) Details http://westbankiowa.com/role/OrganizationandNatureofBusinessandSummaryofSignificantAccountingPoliciesPolicies 49 false false R50.htm 0000050 - Disclosure - Earnings per Common Share (Details) Sheet http://westbankiowa.com/role/EarningsperCommonShareDetails Earnings per Common Share (Details) Details http://westbankiowa.com/role/EarningsperCommonShareTables 50 false false R51.htm 0000051 - Disclosure - Investment Securities Available-for-Sale by Security Type (Details) Sheet http://westbankiowa.com/role/InvestmentSecuritiesAvailableforSalebySecurityTypeDetails Investment Securities Available-for-Sale by Security Type (Details) Details 51 false false R52.htm 0000052 - Disclosure - Investment Securities Contractual Maturity (Details) Sheet http://westbankiowa.com/role/InvestmentSecuritiesContractualMaturityDetails Investment Securities Contractual Maturity (Details) Details 52 false false R53.htm 0000053 - Disclosure - Investment Securities Detail of Sale of Securities (Details) Sheet http://westbankiowa.com/role/InvestmentSecuritiesDetailofSaleofSecuritiesDetails Investment Securities Detail of Sale of Securities (Details) Details 53 false false R54.htm 0000054 - Disclosure - Investment Securities Gross Unrealized Losses - AFS (Details) Sheet http://westbankiowa.com/role/InvestmentSecuritiesGrossUnrealizedLossesAFSDetails Investment Securities Gross Unrealized Losses - AFS (Details) Details 54 false false R55.htm 0000055 - Disclosure - Investment Securities Other Narratives (Details) Sheet http://westbankiowa.com/role/InvestmentSecuritiesOtherNarrativesDetails Investment Securities Other Narratives (Details) Details 55 false false R56.htm 0000056 - Disclosure - Loans and Allowance for Loan Losses Schedule of Loans (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofLoansDetails Loans and Allowance for Loan Losses Schedule of Loans (Details) Details 56 false false R57.htm 0000057 - Disclosure - Loans and Allowance for Loan Losses Schedule of Loan Transactions with Related Parties (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofLoanTransactionswithRelatedPartiesDetails Loans and Allowance for Loan Losses Schedule of Loan Transactions with Related Parties (Details) Details 57 false false R58.htm 0000058 - Disclosure - Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without an Allowance (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofImpairedLoansWithandWithoutanAllowanceDetails Loans and Allowance for Loan Losses Schedule of Impaired Loans With and Without an Allowance (Details) Details 58 false false R59.htm 0000059 - Disclosure - Loans and Allowance for Loan Losses Impaired Loans (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesImpairedLoansDetails Loans and Allowance for Loan Losses Impaired Loans (Details) Details 59 false false R60.htm 0000060 - Disclosure - Loans and Allowance for Loan Losses Schedule of Past Due Loans (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofPastDueLoansDetails Loans and Allowance for Loan Losses Schedule of Past Due Loans (Details) Details 60 false false R61.htm 0000061 - Disclosure - Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loan Modifications (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofTroubledDebtRestructuredLoanModificationsDetails Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loan Modifications (Details) Details 61 false false R62.htm 0000062 - Disclosure - Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans that Subsequently Defaulted (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofTroubledDebtRestructuredLoansthatSubsequentlyDefaultedDetails Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructured Loans that Subsequently Defaulted (Details) Details 62 false false R63.htm 0000063 - Disclosure - Loans and Allowance for Loan Losses Schedule of Loans by Credit Quality Indicator (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofLoansbyCreditQualityIndicatorDetails Loans and Allowance for Loan Losses Schedule of Loans by Credit Quality Indicator (Details) Details 63 false false R64.htm 0000064 - Disclosure - Loans and Allowance for Loan Losses Schedule of Allowance for Loan Loss Activity (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofAllowanceforLoanLossActivityDetails Loans and Allowance for Loan Losses Schedule of Allowance for Loan Loss Activity (Details) Details 64 false false R65.htm 0000065 - Disclosure - Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses Based on Impairment Method (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofAllowanceforLoanLossesBasedonImpairmentMethodDetails Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses Based on Impairment Method (Details) Details 65 false false R66.htm 0000066 - Disclosure - Loans and Allowance for Loan Losses Schedule of Loans by Impairment Method (Details) Sheet http://westbankiowa.com/role/LoansandAllowanceforLoanLossesScheduleofLoansbyImpairmentMethodDetails Loans and Allowance for Loan Losses Schedule of Loans by Impairment Method (Details) Details 66 false false R67.htm 0000067 - Disclosure - Premises and Equipment, Net (Details) Sheet http://westbankiowa.com/role/PremisesandEquipmentNetDetails Premises and Equipment, Net (Details) Details http://westbankiowa.com/role/PremisesandEquipmentNetTables 67 false false R68.htm 0000068 - Disclosure - Operating Leases Operating Leases Narrative (Details) Sheet http://westbankiowa.com/role/OperatingLeasesOperatingLeasesNarrativeDetails Operating Leases Operating Leases Narrative (Details) Details 68 false false R69.htm 0000069 - Disclosure - Operating Leases Schedule of operating lease payments (Details) Sheet http://westbankiowa.com/role/OperatingLeasesScheduleofoperatingleasepaymentsDetails Operating Leases Schedule of operating lease payments (Details) Details 69 false false R70.htm 0000070 - Disclosure - Deposits Deposits (Details) Sheet http://westbankiowa.com/role/DepositsDepositsDetails Deposits Deposits (Details) Details 70 false false R71.htm 0000071 - Disclosure - Subordinated Debt (Details) Sheet http://westbankiowa.com/role/SubordinatedDebtDetails Subordinated Debt (Details) Details 71 false false R72.htm 0000072 - Disclosure - Federal Home Loan Bank Advances, Maturities Summary (Details) Sheet http://westbankiowa.com/role/FederalHomeLoanBankAdvancesMaturitiesSummaryDetails Federal Home Loan Bank Advances, Maturities Summary (Details) Details 72 false false R73.htm 0000073 - Disclosure - Federal Home Loan Bank Advances (Other Narratives) (Details) Sheet http://westbankiowa.com/role/FederalHomeLoanBankAdvancesOtherNarrativesDetails Federal Home Loan Bank Advances (Other Narratives) (Details) Details http://westbankiowa.com/role/FederalHomeLoanBankAdvancesNotes 73 false false R74.htm 0000074 - Disclosure - Long-term debt (Details) Sheet http://westbankiowa.com/role/LongtermdebtDetails Long-term debt (Details) Details http://westbankiowa.com/role/LongtermdebtTables 74 false false R75.htm 0000075 - Disclosure - Long-term debt Maturities of long-term debt (Details) Sheet http://westbankiowa.com/role/LongtermdebtMaturitiesoflongtermdebtDetails Long-term debt Maturities of long-term debt (Details) Details 75 false false R76.htm 0000076 - Disclosure - Derivatives (Details) Sheet http://westbankiowa.com/role/DerivativesDetails Derivatives (Details) Details http://westbankiowa.com/role/DerivativesTables 76 false false R77.htm 0000077 - Disclosure - Derivatives Pre-Tax Losses (Details) Sheet http://westbankiowa.com/role/DerivativesPreTaxLossesDetails Derivatives Pre-Tax Losses (Details) Details 77 false false R78.htm 0000078 - Disclosure - Income Taxes Schedule of Components of Income Tax Expense (Details) Sheet http://westbankiowa.com/role/IncomeTaxesScheduleofComponentsofIncomeTaxExpenseDetails Income Taxes Schedule of Components of Income Tax Expense (Details) Details 78 false false R79.htm 0000079 - Disclosure - Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://westbankiowa.com/role/IncomeTaxesScheduleofEffectiveIncomeTaxRateReconciliationDetails Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) Details 79 false false R80.htm 0000080 - Disclosure - Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) Sheet http://westbankiowa.com/role/IncomeTaxesScheduleofDeferredTaxAssetsandLiabilitiesDetails Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) Details 80 false false R81.htm 0000081 - Disclosure - Income Taxes Schedule of Operating Loss Carryforwards (Details) Sheet http://westbankiowa.com/role/IncomeTaxesScheduleofOperatingLossCarryforwardsDetails Income Taxes Schedule of Operating Loss Carryforwards (Details) Details 81 false false R82.htm 0000082 - Disclosure - Income Taxes Schedule of Penalties and Interest (Details) Sheet http://westbankiowa.com/role/IncomeTaxesScheduleofPenaltiesandInterestDetails Income Taxes Schedule of Penalties and Interest (Details) Details 82 false false R83.htm 0000083 - Disclosure - Stock Compensation Plans Restricted Stock Unit Activity (Details) Sheet http://westbankiowa.com/role/StockCompensationPlansRestrictedStockUnitActivityDetails Stock Compensation Plans Restricted Stock Unit Activity (Details) Details 83 false false R84.htm 0000084 - Disclosure - Stock Compensation Plans Narratives (Details) Sheet http://westbankiowa.com/role/StockCompensationPlansNarrativesDetails Stock Compensation Plans Narratives (Details) Details 84 false false R85.htm 0000085 - Disclosure - Employee Savings and Stock Ownership Plan (Details) Sheet http://westbankiowa.com/role/EmployeeSavingsandStockOwnershipPlanDetails Employee Savings and Stock Ownership Plan (Details) Details http://westbankiowa.com/role/EmployeeSavingsandStockOwnershipPlanNotes 85 false false R86.htm 0000086 - Disclosure - Changes in Accumulated Other Comprehensive Income (Details) Sheet http://westbankiowa.com/role/ChangesinAccumulatedOtherComprehensiveIncomeDetails Changes in Accumulated Other Comprehensive Income (Details) Details 86 false false R87.htm 0000087 - Disclosure - Regulatory Capital Requirements (Details) Sheet http://westbankiowa.com/role/RegulatoryCapitalRequirementsDetails Regulatory Capital Requirements (Details) Details http://westbankiowa.com/role/RegulatoryCapitalRequirementsTables 87 false false R88.htm 0000088 - Disclosure - Commitments and Contingencies Commitments (Details) Sheet http://westbankiowa.com/role/CommitmentsandContingenciesCommitmentsDetails Commitments and Contingencies Commitments (Details) Details 88 false false R89.htm 0000089 - Disclosure - Commitments and Contingencies Other Narratives (Details) Sheet http://westbankiowa.com/role/CommitmentsandContingenciesOtherNarrativesDetails Commitments and Contingencies Other Narratives (Details) Details 89 false false R90.htm 0000090 - Disclosure - Commitments and Contingencies Contractual commitments (Details) Sheet http://westbankiowa.com/role/CommitmentsandContingenciesContractualcommitmentsDetails Commitments and Contingencies Contractual commitments (Details) Details 90 false false R91.htm 0000091 - Disclosure - Fair Value Measurements Recurring Basis by Level (Details) Sheet http://westbankiowa.com/role/FairValueMeasurementsRecurringBasisbyLevelDetails Fair Value Measurements Recurring Basis by Level (Details) Details 91 false false R92.htm 0000092 - Disclosure - Fair Value Measurements Nonrecurring Basis by Level (Details) Sheet http://westbankiowa.com/role/FairValueMeasurementsNonrecurringBasisbyLevelDetails Fair Value Measurements Nonrecurring Basis by Level (Details) Details 92 false false R93.htm 0000093 - Disclosure - Fair Value Measurements Carrying Amounts and Fair Values (Details) Sheet http://westbankiowa.com/role/FairValueMeasurementsCarryingAmountsandFairValuesDetails Fair Value Measurements Carrying Amounts and Fair Values (Details) Details 93 false false R94.htm 0000094 - Disclosure - Fair Value Measurements Narratives (Details) Sheet http://westbankiowa.com/role/FairValueMeasurementsNarrativesDetails Fair Value Measurements Narratives (Details) Details 94 false false R95.htm 0000095 - Disclosure - Condensed Balance Sheets - Parent Company Only (Details) Sheet http://westbankiowa.com/role/CondensedBalanceSheetsParentCompanyOnlyDetails Condensed Balance Sheets - Parent Company Only (Details) Details 95 false false R96.htm 0000096 - Disclosure - Condensed Statements of Income- Parent Company Only (Details) Sheet http://westbankiowa.com/role/CondensedStatementsofIncomeParentCompanyOnlyDetails Condensed Statements of Income- Parent Company Only (Details) Details 96 false false R97.htm 0000097 - Disclosure - Condensed Statements of Cash Flows - Parent Company Only (Details) Sheet http://westbankiowa.com/role/CondensedStatementsofCashFlowsParentCompanyOnlyDetails Condensed Statements of Cash Flows - Parent Company Only (Details) Details 97 false false All Reports Book All Reports [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 3 fact(s) appearing in ix:hidden were eligible for transformation: us-gaap:PreferredStockSharesOutstanding, wtba:DebtInstrumentMaturityMonthandYear - wtba-20221231.htm 4 wtba-20221231.htm wtba-20221231.xsd wtba-20221231_cal.xml wtba-20221231_def.xml wtba-20221231_lab.xml wtba-20221231_pre.xml wtba-20221231x10kex1031.htm wtba-20221231x10kex21.htm wtba-20221231x10kex23.htm wtba-20221231x10kex311.htm wtba-20221231x10kex312.htm wtba-20221231x10kex321.htm wtba-20221231x10kex322.htm wtba-20221231_g1.jpg http://fasb.org/srt/2022 http://fasb.org/us-gaap/2022 http://xbrl.sec.gov/dei/2022 true true