Loss Contingencies [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Loans, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit [Table Text Block] Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit [Table Text Block] Summary Of Outstanding Commitments To Extend Credit And Letters Of Credit [Table Text Block] Deferred tax assets, accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Statistical Measurement [Domain] Statistical Measurement [Domain] Loans And Leases Receivable Allowance For Loan Losses Policy Loans And Leases Receivable Allowance For Loan Losses Policy [Policy Text Block] Loans And Leases Receivable Allowance For Loan Losses Policy Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, to be Paid, after Year Five Schedule of Condensed Balance Sheet [Table Text Block] Condensed Balance Sheet [Table Text Block] Defined contribution plan, employer discretionary contribution percent Defined Contribution Plan Employer Discretionary Contribution Percent Defined contribution plan, employer discretionary contribution, percentage of salaries. Interest income recognized on nonaccrual loans Financing Receivable, Nonaccrual, Interest Income Other subordinated debt, gross Other subordinated debt Including the current and noncurrent portions, carrying value as of the balance sheet date of other subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. Effective income tax rate reconciliation, stock compensation, percent Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Income tax (expense) benefit OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Interest rate swap [Member] Interest Rate Swap [Member] Operating lease, right of use asset Operating lease, right of use asset [Member] Operating lease contractual agreement that stipulates the lessee pay the lessor for use of an asset. Bank-owned life insurance Bank Owned Life Insurance Expense, defined contribution plan, employer contributions Defined Contribution Plan Employer Contribution Amount Defined contribution plan employer matching and discretionary contribution amounts. Leases [Abstract] Leases [Abstract] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Restricted stock unit employee expense Restricted Stock or Unit Expense Charge-offs Loans, Allowance for Credit Loss, Writeoff Financing Receivable, Allowance for Credit Loss, Writeoff Nonaccrual loans with no allowance for credit losses Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance Loans, Allowance for Credit Loss, Writeoff, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Originated, More than Five Years before Current Fiscal Year Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, by Balance Sheet Grouping [Table Text Block] Income tax reconciliation, tax-exempt increase in cash value of life insurance and gains, amount Income Tax Reconciliation, Tax-exempt increase in cash value of life insurance and gains, Amount Income Tax Reconciliation, tax-exempt increase in cash value of life insurance and gains Investment securities available for sale, gross unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Other real estate owned, included in other assets Other Real Estate Owned, included in Other Assets Other Real Estate Owned, included in Other Assets Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Measurement Basis [Axis] Basic earnings per common share Earnings Per Share, Basic Increase (decrease) in accrued expenses and other liabilities Increase (decrease) in accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Loans, Schedule of Collateral Dependent Loans [Line Items] Financing Receivable, Schedule of Collateral Dependent Loans [Line Items] Financing Receivable, Schedule of Collateral Dependent Loans [Line Items] Number of bank branches Number of Bank Branches The number of bank branches in a particular location. Deferred tax assets, restricted stock unit compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Loans, Nonaccrual [Table] Financing Receivable, Nonaccrual [Table] Deferred tax assets, gross Deferred Tax Assets, Gross Other comprehensive income (loss), net of tax Other comprehensive income (loss), net of tax Net current period other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Time deposit maturities, 2030 Time Deposit Maturities, Year Five Fair Value Transfer, Policy [Policy Text Block] Fair Value Transfer, Policy [Policy Text Block] (Increase) decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Common equity tier one risk-based capital required for capital adequacy to risk-weighted assets ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum FHLB MPF program remaining outstanding balance of loans sold FHLB MPF Program Remaining Outstanding Balance of Loans Sold FHLB MPF Program Remaining Outstanding Balance of Loans Sold Collateralized mortgage obligations [Member] Collateralized Mortgage Obligations [Member] Debt instrument, unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Consolidation, Policy [Policy Text Block] Consolidation, Policy [Policy Text Block] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Interest rate collar Interest rate collar [Member] A hedging arrangement where the Company pays the counterparty an incremental amount if the index rate falls below the floor rate. Conversely, the Company receives an incremental amount if the index rate rises above the cap rate. Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents, Policy [Policy Text Block] Debit cards [Member] Debit Card [Member] Taxable Interest Income, Securities, Operating, Taxable Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Cash dividends declared, common stock Dividends, Common Stock, Cash Total stockholders’ equity Beginning Balance Ending Balance Accumulated other comprehensive income Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Investment Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Stock compensation expense Share-Based Payment Arrangement, Expense Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Common stock, share authorized Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Transfers between levels, fair value disclosure Transfers between Levels, Fair Value Disclosure Amount of transfers of assets measured on a recurring basis between Levels of the fair value hierarchy. Total liabilities and stockholders’ equity Liabilities and Equity Fair value, measurements, recurring [Member] Fair Value, Recurring [Member] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Related party loans, effect of change in classification Loans and Leases Receivable, Related Parties, Effect of change in classification Amount of increase (decrease) in loans and leases receivable due from related parties due to a change in classification Tier one leverage capital required to be well-capitalized Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Deferred tax liabilities, net unrealized gains on interest rate swaps Deferred Tax Liabilities, Derivatives LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Common equity tier one risk-based capital required to be well-capitalized Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum State and Local Jurisdiction State and Local Jurisdiction [Member] Cover [Abstract] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Deferred tax assets, other Deferred Tax Assets, Other Maximum [Member] Maximum [Member] Deposits with banks Interest Income, Federal Funds Sold Property, Plant and Equipment, Net [Abstract] Property, Plant and Equipment, Net [Abstract] Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract] Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust [Abstract] Long-term Debt, Unclassified [Abstract] Long-Term Debt, Unclassified [Abstract] Accounting Policies [Abstract] Accounting Policies [Abstract] Related party loans, new loans Loans and Leases Receivable, Related Parties, Additions Investment securities available for sale, total, continuous unrealized loss position, fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Due after ten years, amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Tier one risk-based capital required to be well-capitalized Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Maturities of Time Deposits [Table Text Block] Schedule of Maturities of Time Deposits [Table Text Block] Tabular disclosure of the maturities of time deposits. Stock compensation plan, restricted stock units, vested in period, fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Loans, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Schedule of Loans, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Tier one leverage capital required to be well-capitalized to average assets ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Other assets [Member] Other Assets [Member] Loans, 90 or more days past due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] LIABILITIES Liabilities [Abstract] Equity in net income of West Bancorporation Capital Trust I Equity in net income of West Bancorporation Capital Trust I Equity in net (loss) income of wholly owned nonbank subsidiaries Equity in net (loss) income of wholly owned nonbank subsidiaries. Income before income taxes Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Tier one leverage capital to average assets ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Common Stock: Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag Securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] Deferred tax assets, net, before valuation allowance Deferred Tax Assets, Net, Before Valuation Allowance Net deferred tax assets before valuation allowance Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Regulatory Capital Requirements under Banking Regulations [Text Block] Regulatory Capital Requirements under Banking Regulations [Text Block] Net cash provided by operating activities - Parent Company Net cash provided by operating activities - Parent Company Amount of cash inflow (outflow) from parent company activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Loans, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Cash Beginning Ending Cash Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, to be Paid, Year Three Deferred tax assets, net unrealized losses on securities available for sale Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Coralville, Iowa [Member] Coralville, Iowa [Member] Coralville, Iowa [Member] Interest expense Interest Expense, Operating Tier one risk-based capital required to be well-capitalized to risk-weighted assets ratio Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Other commitments to extend credit Other commitments to extend credit [Member] Legally binding loan commitments to extend credit to a counterparty under certain terms and conditions, excluding real estate construction loan commitments. Loans by impairment method Loans by impairment method [Table Text Block] Loans by impairment method Secured debt [Member] Secured Debt [Member] Net increase in deposits Increase (Decrease) in Deposits Proceeds from principal paydowns, maturities and calls of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Loans, Nonaccrual [Line Items] Financing Receivable, Nonaccrual [Line Items] Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Allowance for credit losses, individually evaluated for impairment Financing Receivable, Allowance for Credit Loss, Individually Evaluated Document Fiscal Period Focus Document Fiscal Period Focus Investments securities, available for sale, continuous unrealized loss position , greater than 12 months, number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, 12 Months or Longer, Number of Positions Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. Intangible assets Intangible Assets, Net (Including Goodwill) Unsecured debt [Member] Unsecured Debt [Member] Nonaccrual loans Financing Receivable, Excluding Accrued Interest, Nonaccrual Unrealized Gain (Loss) on Investments [Table Text Block] Unrealized Gain (Loss) on Investments [Table Text Block] Investment in West Bancorporation Capital Trust I Investment in Wholly Owned Nonbank Subsidiaries Investment in wholly owned nonbank subsidiaries. Award Type [Axis] Award Type [Axis] Derivative instruments, gain (loss) reclassification from accumulated OCI to income, estimated net amount to be transferred Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred Hedging Relationship [Domain] Hedging Relationship [Domain] Parent Company [Member] Parent Company [Member] Legal Entity [Axis] Legal Entity [Axis] Deferral period option, junior subordinated debentures Deferral period option, junior subordinated debentures The amount of time the Company has the right to defer distributions (and related TPS) on its junior subordinated debentures. Total assets Assets Schedule of Condensed Cash Flow Statement [Table Text Block] Condensed Cash Flow Statement [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Share-based Payment Arrangement [Policy Text Block] Share-Based Payment Arrangement [Policy Text Block] Deferred tax assets, allowance for loan losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss Trading Symbol Trading Symbol Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Stock compensation plan, restricted stock units, vested in period, weighted average grant date fair value ($ per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Loans, Recorded Investment [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Tax-exempt Interest Income, Securities, Operating, Tax Exempt Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Commitments to Fund Real Estate Construction Loans Commitments to Fund Real Estate Construction Loans [Member] Commitments to Fund Real Estate Construction Loans Allowance for Loan Losses [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Entity Address, City or Town Entity Address, City or Town Cash Flows from Operating Activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Class of Loan [Axis] Class of Financing Receivable [Axis] Income tax reconciliation, energy-related investment tax credit, amount Income Tax Reconciliation, Energy-related investment tax credit, amount Income Tax Reconciliation, Energy-related investment tax credit, amount Restricted stock units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Loans pledged for Federal Home Loan Bank Advances Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Time deposit maturities, 2027 Time Deposit Maturities, Year Two Entity Emerging Growth Company Entity Emerging Growth Company Total capital required for capital adequacy to risk-weighted assets ratio Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Common equity tier one risk-based capital to risk-weighted assets ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Cash dividends declared per common share Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Cash, Cash Equivalents, and Federal Funds Sold [Abstract] Cash, Cash Equivalents, and Short-Term Investments [Abstract] Investment Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Revenue from contract with customer Revenue from Contract with Customer, Including Assessed Tax Fair value, inputs, level 2 [Member] Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Income tax reconciliation, state income taxes, amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount FHLB advances Interest Expense, FHLB Advances Interest expense incurred during the reporting period on borrowings associated with Federal Home Loan Bank advances. Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Total noninterest income Noninterest Income Net amortization and accretion Net amortization and accretion Net amortization and accretion of discounts and premiums on investments and amortization of prepayment penalties related to FHLB advances. Common stock, shares outstanding Common stock, shares outstanding Common stock, shares outstanding Common Stock, Shares, Outstanding 1-4 family residential first mortgages [Member] Residential Mortgage [Member] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Plan Name [Axis] Plan Name [Axis] Property, Plant and Equipment, Policy [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Noninterest expense: Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Tier one leverage capital Banking Regulation, Tier 1 Leverage Capital, Actual Investments Classified by Contractual Maturity Date [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Class of Loan [Domain] Loan Allowance [Domain] Class of Financing Receivable [Domain] Loans 90 Days or more past due and accruing Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Junior subordinated debt [Member] Junior Subordinated Debt [Member] Change in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Guarantor obligations, current carrying value Guarantor Obligations, Current Carrying Value Common equity tier one risk-based capital Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Interest-bearing demand Interest-Bearing Domestic Deposit, Demand Deferred tax liabilities, premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivative Instruments and Hedging Activities Disclosure [Abstract] Time Time deposits, total Time Deposits Federal Home Loan Bank stock quoted value Federal Home Loan Bank stock quoted value Federal Home Loan Bank stock quoted value Retained Earnings [Member] Retained Earnings [Member] Accrued expenses and other liabilities Accounts Payable and Accrued Liabilities Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Debt instrument, interest rate, effective percentage Debt Instrument, Interest Rate, Effective Percentage Entity Address, Postal Zip Code Entity Address, Postal Zip Code Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Beginning Ending Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income taxes Income tax expense Income tax benefits Income Tax Expense (Benefit) Investment securities available for sale, continuous unrealized loss position, 12 months or longer, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Interest expense [Member] Interest Expense [Member] Income tax (expense) benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other assets Other Assets Federal Home Loan Bank advances Federal Home Loan Bank advances, current and noncurrent Carrying amount of Federal Home Loan Bank advances, including current and noncurrent amounts. Preferred stock, shares issued Preferred Stock, Shares Issued Common equity tier one risk-based capital required for capital adequacy Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Designated as hedging instrument [Member] Designated as Hedging Instrument [Member] Credit loss expense - off balance sheet exposures Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-Sale [Abstract] Hedging Relationship [Axis] Hedging Relationship [Axis] Other comprehensive income (loss) on derivatives Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Long-term Purchase Commitment [Table] Long-Term Purchase Commitment [Table] Premises and equipment, gross Property, Plant and Equipment, Gross Cash and cash equivalents Cash, Cash Equivalents, and Short-Term Investments Purchases of Federal Home Loan Bank stock Payments to Acquire Federal Home Loan Bank Stock Derivative, notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Income tax reconciliation, tax exempt interest income, amount Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Subordinated debt with an interest rate swap contract Subordinated debt with an interest rate swap contract The amount of junior subordinated debt with an interest rate swap contract that effectively converts it from a variable-rate debt instrument to a fixed-rate debt instrument. Loans, Excluding Accrued Interest, Revolving Financing Receivable, Excluding Accrued Interest, Revolving City Area Code City Area Code Financing Receivable, Allowance for Credit Loss [Table Text Block] Financing Receivable, Allowance for Credit Loss [Table Text Block] Buildings [Member] Building and Building Improvements [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Interest rate cash flow hedge asset at fair value Interest Rate Cash Flow Hedge Asset at Fair Value Effective income rate tax reconciliation, tax exempt interest income, percent Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Consumer and other [Member] Consumer and Other Loans [Member] Consumer and Other Loans [Member] Loans and Allowance for Loan Losses [Abstract] Loans and Allowance for Credit Losses [Abstract] Note 7. Impaired Loans and Allowance for Credit Losses [Abstract] Other income Noninterest Income, Other Operating Income Stock compensation plan, restricted stock units, outstanding beginning of period (number of shares) Stock compensation plan, restricted stock units, outstanding end of period (number of shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Deferred tax liabilities, deferred loan costs Deferred Tax Liabilities, Deferred Loan Costs The amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the methods used to account for deferred loan costs for tax purposes and under generally accepted accounting principles which will increase future taxable income when such difference reverses. Junior subordinated debt, gross Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Deferred compensation plan liability Other Deferred Compensation Arrangements, Liability, Current and Noncurrent Loans, Allowance for Credit Loss, Writeoff, Year Three, Two Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year Three, Two Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year Three, Two Years before Current Fiscal Year Loans and Leases Receivable, Fee and Interest Income [Policy Text Block] Financing Receivable, Fee and Interest Income [Policy Text Block] Cash Flows from Investing Activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Federal Reserve, collateral Line of Credit Facility, Collateral Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accrued interest receivable Interest Receivable Dividends received from West Bancorporation Capital Trust I Cash dividends received from wholly owned nonbank subsidiaries Cash dividends received from wholly owned nonbank subsidiaries. Proceeds from sales of securities available for sale Proceeds from Sale of Debt Securities, Available-for-Sale Premises and equipment, useful life Property, Plant and Equipment, Useful Life Preferred stock, par value ($ per share) Preferred Stock, Par or Stated Value Per Share Cash flow hedging [Member] Cash Flow Hedging [Member] Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Net interest income Interest Income (Expense), Operating Tier one risk-based capital Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Counterparty collateral already posted Counterparty Collateral Already Posted, Fair Value The aggregate fair value of assets that are already posted by counterparties, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. Deferred federal income tax expense Deferred Federal Income Tax Expense (Benefit) Equity Components [Axis] Equity Components [Axis] Loans, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Premises and equipment [Line Items] Property, Plant and Equipment [Line Items] Standby letters of credit [Member] Standby Letters of Credit [Member] Auditor Name Auditor Name Income tax reconciliation, stock compensation, amount Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Loans, Schedule of Collateral Dependent Loans [Table] Financing Receivable, Schedule of Collateral Dependent Loans [Table] Financing Receivable, Schedule of Collateral Dependent Loans [Table] Interest rate swap hedging deposit accounts [Member] Interest rate swap hedging deposit accounts [Member] Interest rate swap hedging deposit accounts [Member] Subtotal before securities without single maturities, fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Equipment Equipment [Member] Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Effective income tax rate reconciliation, energy-related investment tax credit, percent Effective Income Tax Rate Reconciliation, Tax Credit, Amount Energy-related investment tax credit percent Effective Income Tax Rate Reconciliation, Tax Credit, Amount Energy-related investment tax credit percent Debt instrument, interest rate, effective percentage on subordinated debt with interest rate swap Debt instrument, interest rate, effective percentage on debt with interest rate swap Effective interest rate for funds borrowed under the debt agreement hedged with an interest rate swap. The effective rate includes adjustments for discount amortization and interest rate swap terms, if applicable. Debt instrument tenor spread adjustment on variable rate Debt instrument basis spread reduction on variable rate Debt Instrument Tenor Spread Adjustment on Variable Rate Debt Instrument Tenor Spread Adjustment on Variable Rate Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Supplemental Disclosure of Cash Flow Information: Supplemental Cash Flow Information [Abstract] Commercial real estate [Member] Commercial Real Estate [Member] Investment securities available for sale, amortized cost Debt Securities, Available-for-Sale, Amortized Cost Entity Address, State or Province Entity Address, State or Province Substandard [Member] Substandard [Member] Stock-based compensation costs APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition Total interest income Interest and Dividend Income, Operating Loans, Allowance for Credit Loss, Writeoff, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year Four, Originated, Three Years before Current Fiscal Year Watch [Member] Special Mention [Member] Loans, Period Past Due [Domain] Financial Asset, Aging [Domain] Investment Securities, Policy [Policy Text Block] Marketable Securities, Policy [Policy Text Block] Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurement, Policy [Policy Text Block] Allowance for credit losses, collectively evaluated for impairment Financing Receivable, Allowance for Credit Loss, Collectively Evaluated Real Estate [Member] Real Estate [Member] Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Excluding Exchange Rate Effect, Including Discontinued Operation Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-Term Purchase Commitment, Category of Item Purchased [Domain] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy [Policy Text Block] Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Common stock dividends paid Common stock cash dividends Payments of Ordinary Dividends, Common Stock Document Annual Report Document Annual Report Entity [Domain] Entity [Domain] Net Cash Provided by (Used in) Investing Activities, Total Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Iowa income taxes paid State Income Taxes Paid Iowa State Income Taxes Paid Iowa Cash payments for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Collateralized mortgage obligations, and mortgage-backed securities, amortized cost Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Tier one leverage capital required for capital adequacy with capital conservation buffer to average assets ratio Tier one leverage capital ratio, capital adequacy with capital conservation buffer to average assets, minimum The minimum amount of tier one leverage capital for capital adequacy purposes plus the capital conservation buffer divided by average assets as defined in the regulations. 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Estimate of fair value, fair value disclosure [Member] Estimate of Fair Value Measurement [Member] Equity in net income of West Bank Equity in net income of West Bank Equity in Net Income (Loss) of Wholly Owned Bank Subsidiaries Equity in net income (loss) of wholly owned bank subsidiaries. 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Includes beneficial interest in securitized financial asset. Statistical Measurement [Axis] Statistical Measurement [Axis] Loans and Leases Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block] Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block] Loans, individually evaluated for impairment Financing Receivable, Individually Evaluated for Credit Loss Restricted stock units withheld for payroll taxes Payment, Tax Withholding, Share-Based Payment Arrangement Weighted average fixed interest rate paid Derivative, Average Fixed Interest Rate Federal Home Loan Bank Advances (Other Narratives) [Abstract] Federal Home Loan Bank Advances [Abstract] Federal Home Loan Bank Advances [Abstract] Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] Derivative Instruments, Gain (Loss) [Table Text Block] Collateral dependent loans Collateral dependent loans [Table Text Block] Collateral dependent loans Operating Expenses Total operating expenses Operating Expenses Fair value, inputs, level 1 [Member] Fair Value, Inputs, Level 1 [Member] Amount outstanding, line of credit Long-Term Line of Credit Long term debt with an interest rate swap contract Long term debt with an interest rate swap contract Other long term debt with an interest rate swap contract Diluted earnings per common share Earnings Per Share, Diluted Forecast [Member] Forecast [Member] FDIC insurance Federal Deposit Insurance Corporation Premium Expense Tier one risk-based capital required for capital adequacy with capital conservation buffer Tier One Risk-Based Capital, Capital Adequacy With Capital Conservation Buffer, Minimum The minimum amount of tier one risk-based capital required for capital adequacy purposes plus the capital conservation buffer. Title of 12(b) Security Title of 12(b) Security Due after five years through ten years, fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Schedule of Realized Gain (Loss) [Table Text Block] Schedule of Realized Gain (Loss) [Table Text Block] AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table] Effective income tax rate reconciliation other, amount Effective Income Tax Rate Reconciliation Other, Amount Effective Income Tax Rate Reconciliation Other, Amount Commercial [Member] Commercial Loan [Member] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, to be Paid, Year Five Long-term debt Interest on long-term debt Interest Expense, Other Long-Term Debt Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location Other subordinated debt, interest rate Subordinated Borrowing, Interest Rate Affordable Housing Project Investment [Member] Affordable Housing Project Investment [Member] Affordable Housing Project Investment [Member] Comprehensive Income, Policy [Policy Text Block] Comprehensive Income, Policy [Policy Text Block] US federal income taxes paid Income Tax Paid, Federal, before Refund Received Operating lease discount effect Lessee, Operating Lease, Liability, Undiscounted Excess Amount Effective income tax rate reconciliation, nondeductible interest expense to own tax-exempt securities, percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Time deposit maturities, 2026 Time Deposit Maturities, Year One Loans, Allowance for Loan Losses [Line Items] Loans, Allowance for Credit Losses [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Commitments to extend credit [Member] Commitments to Extend Credit [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Measurement Frequency [Domain] Measurement Frequency [Domain] Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, to be Paid Other comprehensive income (loss), before reclassifications, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Deferred state income tax expense Deferred State and Local Income Tax Expense (Benefit) Loans Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] Allowance for Credit Losses by Impairment Method Allowance for Credit Losses by Impairment Method [Table Text Block] Allowance for Credit Losses by Impairment Method [Table Text Block] Subordinated Borrowings [Text Block] Subordinated Borrowings Disclosure [Text Block] Net income Net income Net income Net Income (Loss) Attributable to Parent Shares of common stock per restricted stock unit Shares of common stock per restricted stock unit The number of shares of common stock each restricted stock unit entitles a participant to receive on the vesting date. Gain from bank-owned life insurance Gain from bank-owned life insurance Gain from bank-owned life insurance Collateralized Loan Obligations [Member] Collateralized Loan Obligations [Member] Total capital to risk weighted assets ratio Banking Regulation, Total Risk-Based Capital Ratio, Actual Interest rate cash flow hedge liability at fair value Interest Rate Cash Flow Hedge Liability at Fair Value Common equity tier one risk-based capital required to be well-capitalized to risk-weighted assets ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Weighted average floating interest rate received Derivative, Average Variable Interest Rate Premises and equipment, net Premises and equipment, net Property, Plant and Equipment, Net Preferred stock, shares authorized Preferred Stock, Shares Authorized Loans, gross Loans, gross Amortized cost excluding accrued interest, before allowance for credit loss, of loans and leases receivable. Schedule of Loans Past Due [Table] Financing Receivable, Past Due [Table] Entity Current Reporting Status Entity Current Reporting Status Expiration Date [Axis] Expiration Date [Axis] Expiration Date [Axis] Receivables [Abstract] Derivatives, Fair Value [Line Items] Derivative [Line Items] Allowance for credit Loss allocated to collateral dependent loan Allowance for credit Loss allocated to collateral dependent loan Allowance for credit Loss allocated to collateral dependent loan Collateral Held [Axis] Collateral Held [Axis] Operating Income (Loss) Total operating income Operating Income (Loss) Interest rate non-hedging derivative liability at fair value Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value Consolidated Entities [Domain] Consolidated Entities [Domain] Expiration Date [Domain] Expiration Date [Domain] [Domain] for Expiration Date [Axis] Retained earnings Retained Earnings (Accumulated Deficit) Income tax reconciliation, income tax expense, at federal statutory income tax rate, amount Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Federal Home Loan Bank, advances, fixed rate, maturing in the next 12 months Federal Home Loan Bank, Advance, Maturity, Fixed Rate, Year One Debt instrument, frequency of periodic payment Debt Instrument, Frequency of Periodic Payment Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Common equity tier one risk-based capital required for capital adequacy with capital conservation buffer to risk-weighted assets ratio Common Equity Tier One Risk-Based Capital Ratio, Capital Adequacy With Capital Conservation Buffer To Risk Weighted Assets, Minimum The minimum common equity tier one risk-based capital ratio including the capital conservation buffer. Investment securities available for sale, continuous unrealized loss position, 12 months or longer, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Effective income tax rate reconciliation, state income taxes, percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Class of Stock [Axis] Class of Stock [Axis] Subordinated debt used for subsidiary capital injection Subordinated debt used for subsidiary capital injection Subordinated debt used for subsidiary capital injection Loans with fixed rates of interest Loans Receivable with Fixed Rates of Interest Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Locations of Bank Branches [Table] Schedule of Locations of Bank Branches [Table] Schedule of Locations of Bank Branches [Table] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Investment securities available for sale, continuous unrealized loss position, less than 12 months, gross unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total deposits Deposits Deposits Deferred tax liabilities, other Deferred Tax Liabilities, Other Schedule of Allowance for Credit Losses by Impairment Method [Table] Schedule of Allowance for Loan Losses by Impairment Method [Table] Schedule of Allowance for Loan Losses by Impairment Method [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Stock compensation plan, restricted stock units, number of shares available for grant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Professional fees Professional Fees Statement [Table] Statement [Table] Federal Home Loan Bank stock, at cost Federal Home Loan Bank Stock Provision for deferred income taxes Deferred income tax (benefits) Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows from Financing Activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other expenses Other Noninterest Expense Pass [Member] Pass [Member] Construction, land and land development [Member] Construction Land and Land Development [Member] Construction Land and Land Development [Member] Investment in West Bank Investment in Wholly Owned Bank Subsidiaries. Investments in wholly owned bank subsidiaries. Investment securities available for sale, total, continuous unrealized loss position, gross unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Investment Securities Available for Sale, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Cash and Cash Equivalents: Cash: Cash and Cash Equivalents [Abstract] Number of anti-dilutive common stock equivalents excluded from diluted earnings per share computation Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag Stock compensation plan, tax benefit from vesting of restricted stock units Share-Based Payment Arrangement, Expense, Tax Benefit Investment Securities Available for Sale, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Stock compensation plan, restricted stock units, number of shares authorized Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Long-term debt, maturities, repayments of principal in year two Long-Term Debt, Maturity, Year Two Collateral Pledged Collateral Pledged [Member] Past Due Loans [Table Text Block] Financing Receivable, Past Due [Table Text Block] Lessee, Operating Leases Lessee, Operating Leases [Text Block] Schedule of Loans, Method of Impairment [Table] Schedule of Financing Receivable, Method of Impairment [Table] Schedule of Financing Receivable, Method of Impairment [Table] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Time deposit maturities, 2028 Time Deposit Maturities, Year Three Allowance for credit loss - loans, beginning balance Allowance for credit loss - loans, ending balance Allowance for credit loss - loans Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Provision for credit loss expense - loans Financing Receivable, Credit Loss, Expense (Reversal) Accrued interest receivable on securities available for sale Debt Securities, Available-for-Sale, Accrued Interest, before Allowance for Credit Loss Amount, before allowance for credit loss, of accrued interest on available-for-sale debt securities. Operating lease, weighted average discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Bank-Owned Life Insurance [Policy Text Block] Bank-Owned Life Insurance [Policy Text Block] Disclosure of accounting policy for bank-owned life insurance. Weighted average common shares outstanding (shares) Weighted Average Number of Shares Outstanding, Basic Premises and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Debt instrument, description of variable rate basis Debt Instrument, Description of Variable Rate Basis Operating lease liability Lease liabilities, operating leases Lease liabilities, operating leases Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating lease, rent expense Operating Lease, Expense Loans, Allowance For Credit Loss, Writeoff, Year Two, Originated, Fiscal Year before Current Fiscal Year Financing Receivable, Allowance For Credit Loss, Writeoff, Year Two, Originated, Fiscal Year before Current Fiscal Year Financing Receivable, Allowance For Credit Loss, Writeoff, Year Two, Originated, Fiscal Year before Current Fiscal Year Loans, after allowance for credit losses Loans, after allowance for credit losses Amortized cost, excluding accrued interest, after allowance for credit loss, of loans and receivable, and before deduction of deferred interest and fees Debt instrument, variable interest rate Long-Term Debt, Percentage Bearing Variable Interest, Percentage Rate Amortization Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Additional borrowing capacity, Federal Home Loan Bank advances Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Collateralized mortgage obligations and mortgage-backed securities, fair value Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Federal Home Loan Bank, advances, weighted average effective interest rate Federal Home Loan Bank, advances, weighted average effective interest rate Weighted average effective interest rate on Federal Home Loan Bank advances. The effective rate includes adjustments for discount amortization and interest rate swap terms, if applicable. Securities (gains)losses, net Securities (gains)losses, net Debt Securities, Available-for-Sale, Realized Gain (Loss) Unrealized holding gains (losses) on securities arising during the period OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Stock compensation plan [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Minnesota MINNESOTA Common stock, share issued Common Stock, Shares, Issued Effective income tax rate reconciliation, tax-exempt increase in cash value of life insurance and gains, percent Effective Income Tax Reconciliation, Tax-exempt increase in cash value of life insurance and gains, Percent The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to an increase in cash value of life insurance and gains that are exempt from income taxes under enacted federal laws Operating lease, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Tangible capital to tangible assets ratio Banking Regulation, Tangible Capital Ratio, Actual Loans, Allowance for Credit Loss, Writeoff, Year One, Originated, Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year One, Originated, Current Fiscal Year Financing Receivable, Allowance for Credit Loss, Writeoff, Year One, Originated, Current Fiscal Year Use of Estimates, Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Mortgage-backed securities [Member] Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Minnesota income taxes paid State Income Taxes Paid Minnesota State Income Taxes Paid Minnesota Total capital Banking Regulation, Total Capital, Actual Entity Public Float Entity Public Float Occupancy and equipment Occupancy, Net Loan swap fees Loan swap fees Fee income from loan swaps Loans, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Security Exchange Name Security Exchange Name Loans, not past due Financial Asset, Not Past Due [Member] Securities purchased under agreements to resell Securities Purchased under Agreements to Resell Total liabilities Liabilities Commitments to extend credit, expiration after one year [Member] Commitments to extend credit, expiration after one year [Member] Commitments to extend credit that expire after one year [Member] Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Financing Receivables [Text Block] Subtotal before securities without single maturities, amortized cost Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Maximum borrowing capacity, line of credit Line of Credit Facility, Maximum Borrowing Capacity Furniture and equipment [Member] Furniture and equipment [Member] Furniture represents the long-lived, depreciable assets, commonly used in offices and stores while equipment represents the tangible personal property, nonconsumable in nature, with finite lives used to produce goods and services. Operating Expenses [Abstract] Operating Expenses [Abstract] Net increase in loans Payments for (Proceeds from) Loans and Leases Effective income tax rate reconciliation, low income housing tax credits, percent Effective Income Tax Rate Reconciliation, Tax Credit, Amount Low Income Housing Credits percent Effective Income Tax Rate Reconciliation, Tax Credit, Amount Low Income Housing Credits percent Savings and money market Deposits, Savings Deposits Term of junior subordinated debenture maturity Term of Security Maturity Term of Security Maturity Income tax reconciliation, new markets tax credit, amount Income Tax Reconciliation, New markets tax credit, amount Income Tax Reconciliation, New markets tax credit, amount Federal funds purchased and other short-term borrowings Interest Expense, Federal Funds Purchased Statement [Line Items] Statement [Line Items] Subordinated notes Interest on subordinated notes Interest Expense, Subordinated Notes and Debentures Issuance of common stock upon vesting of restricted stock units, net of shares withheld for payroll taxes, value Restricted Stock, Value, Shares Issued Net of Tax Withholdings Loan commitments Unused Commitments to Extend Credit Common Stock [Member] Common stock [Member] Common Stock [Member] Stock compensation plan, restricted stock units, vested in period (number of shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Securities available for sale, at fair value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Net increase (decrease) in Federal Home Loan Bank advances Proceeds from-repayments of Federal Home Loan Bank borrowings Amount of cash inflow for proceeds from or (outflow for repayment of) Federal Home Loan Bank (FHLB) borrowing, classified as financing activity Corporate notes [Member] Corporate Debt Securities [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Federal Home Loan Bank Stock [Policy Text Block] Federal Home Loan Bank Stock [Policy Text Block] Disclosure of accounting policy for Federal Home Loan Bank stock. Cash pledged as collateral Collateral Already Posted, Aggregate Fair Value Locations of Bank Branches [Domain] Locations of Bank Branches [Domain] [Domain] for Locations of Bank Branches [Axis]