3.25.1 html 485 533 1 false 87 0 false 10 false false R1.htm 0000001 - Document - Cover Sheet http://myopenbank.com/role/Cover Cover Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://myopenbank.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Statement - CONSOLIDATED BALANCE SHEETS Sheet http://myopenbank.com/role/CONSOLIDATEDBALANCESHEETS CONSOLIDATED BALANCE SHEETS Statements 3 false false R4.htm 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Sheet http://myopenbank.com/role/CONSOLIDATEDBALANCESHEETSParenthetical CONSOLIDATED BALANCE SHEETS (Parenthetical) Statements 4 false false R5.htm 9952153 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://myopenbank.com/role/CONSOLIDATEDSTATEMENTSOFINCOME CONSOLIDATED STATEMENTS OF INCOME Statements 5 false false R6.htm 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://myopenbank.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 6 false false R7.htm 9952155 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Sheet http://myopenbank.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITY CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Statements 7 false false R8.htm 9952156 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Sheet http://myopenbank.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINSHAREHOLDERSEQUITYParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) Statements 8 false false R9.htm 9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://myopenbank.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 9 false false R10.htm 9952158 - Disclosure - Business and Basis of Presentation Sheet http://myopenbank.com/role/BusinessandBasisofPresentation Business and Basis of Presentation Notes 10 false false R11.htm 9952159 - Disclosure - Securities Sheet http://myopenbank.com/role/Securities Securities Notes 11 false false R12.htm 9952160 - Disclosure - Loans and Allowance for Credit Losses on Loans Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoans Loans and Allowance for Credit Losses on Loans Notes 12 false false R13.htm 9952161 - Disclosure - Premises and Equipment Sheet http://myopenbank.com/role/PremisesandEquipment Premises and Equipment Notes 13 false false R14.htm 9952162 - Disclosure - Servicing Assets Sheet http://myopenbank.com/role/ServicingAssets Servicing Assets Notes 14 false false R15.htm 9952163 - Disclosure - Leases Sheet http://myopenbank.com/role/Leases Leases Notes 15 false false R16.htm 9952164 - Disclosure - Deposits Sheet http://myopenbank.com/role/Deposits Deposits Notes 16 false false R17.htm 9952165 - Disclosure - Borrowing Arrangements Sheet http://myopenbank.com/role/BorrowingArrangements Borrowing Arrangements Notes 17 false false R18.htm 9952166 - Disclosure - Income Taxes Sheet http://myopenbank.com/role/IncomeTaxes Income Taxes Notes 18 false false R19.htm 9952167 - Disclosure - Commitments and Contingencies Sheet http://myopenbank.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 19 false false R20.htm 9952168 - Disclosure - Stock-Based Compensation Sheet http://myopenbank.com/role/StockBasedCompensation Stock-Based Compensation Notes 20 false false R21.htm 9952169 - Disclosure - Employee Benefit Plan Sheet http://myopenbank.com/role/EmployeeBenefitPlan Employee Benefit Plan Notes 21 false false R22.htm 9952170 - Disclosure - Fair Value of Financial Instruments Sheet http://myopenbank.com/role/FairValueofFinancialInstruments Fair Value of Financial Instruments Notes 22 false false R23.htm 9952171 - Disclosure - Derivative Financial Instruments Sheet http://myopenbank.com/role/DerivativeFinancialInstruments Derivative Financial Instruments Notes 23 false false R24.htm 9952172 - Disclosure - Regulatory Capital Matters Sheet http://myopenbank.com/role/RegulatoryCapitalMatters Regulatory Capital Matters Notes 24 false false R25.htm 9952173 - Disclosure - Earnings Per Share Sheet http://myopenbank.com/role/EarningsPerShare Earnings Per Share Notes 25 false false R26.htm 9952174 - Disclosure - Parent Company Condensed Financial Statements Sheet http://myopenbank.com/role/ParentCompanyCondensedFinancialStatements Parent Company Condensed Financial Statements Notes 26 false false R27.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 27 false false R28.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 28 false false R29.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 29 false false R30.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 30 false false R31.htm 9955511 - Disclosure - Business and Basis of Presentation (Policies) Sheet http://myopenbank.com/role/BusinessandBasisofPresentationPolicies Business and Basis of Presentation (Policies) Policies 31 false false R32.htm 9955512 - Disclosure - Business and Basis of Presentation (Tables) Sheet http://myopenbank.com/role/BusinessandBasisofPresentationTables Business and Basis of Presentation (Tables) Tables http://myopenbank.com/role/BusinessandBasisofPresentation 32 false false R33.htm 9955513 - Disclosure - Securities (Tables) Sheet http://myopenbank.com/role/SecuritiesTables Securities (Tables) Tables http://myopenbank.com/role/Securities 33 false false R34.htm 9955514 - Disclosure - Loans and Allowance for Credit Losses on Loans (Tables) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansTables Loans and Allowance for Credit Losses on Loans (Tables) Tables http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoans 34 false false R35.htm 9955515 - Disclosure - Premises and Equipment (Tables) Sheet http://myopenbank.com/role/PremisesandEquipmentTables Premises and Equipment (Tables) Tables http://myopenbank.com/role/PremisesandEquipment 35 false false R36.htm 9955516 - Disclosure - Servicing Assets (Tables) Sheet http://myopenbank.com/role/ServicingAssetsTables Servicing Assets (Tables) Tables http://myopenbank.com/role/ServicingAssets 36 false false R37.htm 9955517 - Disclosure - Leases (Tables) Sheet http://myopenbank.com/role/LeasesTables Leases (Tables) Tables http://myopenbank.com/role/Leases 37 false false R38.htm 9955518 - Disclosure - Deposits (Tables) Sheet http://myopenbank.com/role/DepositsTables Deposits (Tables) Tables http://myopenbank.com/role/Deposits 38 false false R39.htm 9955519 - Disclosure - Borrowing Arrangements (Tables) Sheet http://myopenbank.com/role/BorrowingArrangementsTables Borrowing Arrangements (Tables) Tables http://myopenbank.com/role/BorrowingArrangements 39 false false R40.htm 9955520 - Disclosure - Income Taxes (Tables) Sheet http://myopenbank.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://myopenbank.com/role/IncomeTaxes 40 false false R41.htm 9955521 - Disclosure - Commitments and Contingencies (Tables) Sheet http://myopenbank.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://myopenbank.com/role/CommitmentsandContingencies 41 false false R42.htm 9955522 - Disclosure - Stock-Based Compensation (Tables) Sheet http://myopenbank.com/role/StockBasedCompensationTables Stock-Based Compensation (Tables) Tables http://myopenbank.com/role/StockBasedCompensation 42 false false R43.htm 9955523 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://myopenbank.com/role/FairValueofFinancialInstruments 43 false false R44.htm 9955524 - Disclosure - Derivative Financial Instruments (Tables) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsTables Derivative Financial Instruments (Tables) Tables http://myopenbank.com/role/DerivativeFinancialInstruments 44 false false R45.htm 9955525 - Disclosure - Regulatory Capital Matters (Tables) Sheet http://myopenbank.com/role/RegulatoryCapitalMattersTables Regulatory Capital Matters (Tables) Tables http://myopenbank.com/role/RegulatoryCapitalMatters 45 false false R46.htm 9955526 - Disclosure - Earnings Per Share (Tables) Sheet http://myopenbank.com/role/EarningsPerShareTables Earnings Per Share (Tables) Tables http://myopenbank.com/role/EarningsPerShare 46 false false R47.htm 9955527 - Disclosure - Parent Company Condensed Financial Statements (Tables) Sheet http://myopenbank.com/role/ParentCompanyCondensedFinancialStatementsTables Parent Company Condensed Financial Statements (Tables) Tables http://myopenbank.com/role/ParentCompanyCondensedFinancialStatements 47 false false R48.htm 9955528 - Disclosure - Business and Basis of Presentation - Additional Information (Details) Sheet http://myopenbank.com/role/BusinessandBasisofPresentationAdditionalInformationDetails Business and Basis of Presentation - Additional Information (Details) Details 48 false false R49.htm 9955529 - Disclosure - Business and Basis of Presentation - Schedule of New Accounting Pronouncements Adopted (Details) Sheet http://myopenbank.com/role/BusinessandBasisofPresentationScheduleofNewAccountingPronouncementsAdoptedDetails Business and Basis of Presentation - Schedule of New Accounting Pronouncements Adopted (Details) Details 49 false false R50.htm 9955530 - Disclosure - Securities - Schedule of Amortized Cost, Fair Value, and Corresponding Amounts of Gross Unrealized Gains and Losses for Available for Sale Securities (Details) Sheet http://myopenbank.com/role/SecuritiesScheduleofAmortizedCostFairValueandCorrespondingAmountsofGrossUnrealizedGainsandLossesforAvailableforSaleSecuritiesDetails Securities - Schedule of Amortized Cost, Fair Value, and Corresponding Amounts of Gross Unrealized Gains and Losses for Available for Sale Securities (Details) Details 50 false false R51.htm 9955531 - Disclosure - Securities - Additional Information (Details) Sheet http://myopenbank.com/role/SecuritiesAdditionalInformationDetails Securities - Additional Information (Details) Details 51 false false R52.htm 9955532 - Disclosure - Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity (Details) Sheet http://myopenbank.com/role/SecuritiesScheduleofAmortizedCostandEstimatedFairValueofSecuritiesAvailableforSalebyContractualMaturityDetails Securities - Schedule of Amortized Cost and Estimated Fair Value of Securities Available for Sale by Contractual Maturity (Details) Details 52 false false R53.htm 9955533 - Disclosure - Securities - Schedule of Unrealized Losses on AFS Debt Securities (Details) Sheet http://myopenbank.com/role/SecuritiesScheduleofUnrealizedLossesonAFSDebtSecuritiesDetails Securities - Schedule of Unrealized Losses on AFS Debt Securities (Details) Details 53 false false R54.htm 9955534 - Disclosure - Securities - Schedule of Other Investments (Details) Sheet http://myopenbank.com/role/SecuritiesScheduleofOtherInvestmentsDetails Securities - Schedule of Other Investments (Details) Details 54 false false R55.htm 9955535 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Composition of Loan Portfolio (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofCompositionofLoanPortfolioDetails Loans and Allowance for Credit Losses on Loans - Schedule of Composition of Loan Portfolio (Details) Details 55 false false R56.htm 9955536 - Disclosure - Loans and Allowance for Credit Losses on Loans - Additional Information (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansAdditionalInformationDetails Loans and Allowance for Credit Losses on Loans - Additional Information (Details) Details 56 false false R57.htm 9955537 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Activity in Allowance for Credit Losses on Loans by Portfolio Segment (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofActivityinAllowanceforCreditLossesonLoansbyPortfolioSegmentDetails Loans and Allowance for Credit Losses on Loans - Schedule of Activity in Allowance for Credit Losses on Loans by Portfolio Segment (Details) Details 57 false false R58.htm 9955538 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Collateral Dependent Loans (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofCollateralDependentLoansDetails Loans and Allowance for Credit Losses on Loans - Schedule of Collateral Dependent Loans (Details) Details 58 false false R59.htm 9955539 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 or More Days and Still Accruing Interest by Portfolio Segment (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofRecordedInvestmentinNonaccrualLoansandLoansPastDue90orMoreDaysandStillAccruingInterestbyPortfolioSegmentDetails Loans and Allowance for Credit Losses on Loans - Schedule of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 or More Days and Still Accruing Interest by Portfolio Segment (Details) Details 59 false false R60.htm 9955540 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Aging Analysis of Recorded Investment in Past Due Loans (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofAgingAnalysisofRecordedInvestmentinPastDueLoansDetails Loans and Allowance for Credit Losses on Loans - Schedule of Aging Analysis of Recorded Investment in Past Due Loans (Details) Details 60 false false R61.htm 9955541 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Modified Loans (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofModifiedLoansDetails Loans and Allowance for Credit Losses on Loans - Schedule of Modified Loans (Details) Details 61 false false R62.htm 9955542 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Financial Effect of Loan Modifications (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofFinancialEffectofLoanModificationsDetails Loans and Allowance for Credit Losses on Loans - Schedule of Financial Effect of Loan Modifications (Details) Details 62 false false R63.htm 9955543 - Disclosure - Loans and Allowance for Credit Losses on Loans - Schedule of Credit Risk Ratings by Portfolio Segment (Details) Sheet http://myopenbank.com/role/LoansandAllowanceforCreditLossesonLoansScheduleofCreditRiskRatingsbyPortfolioSegmentDetails Loans and Allowance for Credit Losses on Loans - Schedule of Credit Risk Ratings by Portfolio Segment (Details) Details 63 false false R64.htm 9955544 - Disclosure - Premises and Equipment - Schedule of Premises and Equipment (Details) Sheet http://myopenbank.com/role/PremisesandEquipmentScheduleofPremisesandEquipmentDetails Premises and Equipment - Schedule of Premises and Equipment (Details) Details 64 false false R65.htm 9955545 - Disclosure - Premises and Equipment - Additional Information (Details) Sheet http://myopenbank.com/role/PremisesandEquipmentAdditionalInformationDetails Premises and Equipment - Additional Information (Details) Details 65 false false R66.htm 9955546 - Disclosure - Servicing Assets - Additional Information (Details) Sheet http://myopenbank.com/role/ServicingAssetsAdditionalInformationDetails Servicing Assets - Additional Information (Details) Details 66 false false R67.htm 9955547 - Disclosure - Servicing Assets - Schedule of Activity for Loan Servicing Assets (Details) Sheet http://myopenbank.com/role/ServicingAssetsScheduleofActivityforLoanServicingAssetsDetails Servicing Assets - Schedule of Activity for Loan Servicing Assets (Details) Details 67 false false R68.htm 9955548 - Disclosure - Leases - Additional Information (Details) Sheet http://myopenbank.com/role/LeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 68 false false R69.htm 9955549 - Disclosure - Leases - Schedule of Lease Cost (Details) Sheet http://myopenbank.com/role/LeasesScheduleofLeaseCostDetails Leases - Schedule of Lease Cost (Details) Details 69 false false R70.htm 9955550 - Disclosure - Leases - Schedule of Other Information Related to Operating Leases (Details) Sheet http://myopenbank.com/role/LeasesScheduleofOtherInformationRelatedtoOperatingLeasesDetails Leases - Schedule of Other Information Related to Operating Leases (Details) Details 70 false false R71.htm 9955551 - Disclosure - Leases - Schedule of Remaining Contractually Obligated Lease Payments and Reconciliation to Lease liability (Details) Sheet http://myopenbank.com/role/LeasesScheduleofRemainingContractuallyObligatedLeasePaymentsandReconciliationtoLeaseliabilityDetails Leases - Schedule of Remaining Contractually Obligated Lease Payments and Reconciliation to Lease liability (Details) Details 71 false false R72.htm 9955552 - Disclosure - Deposits - Additional Information (Details) Sheet http://myopenbank.com/role/DepositsAdditionalInformationDetails Deposits - Additional Information (Details) Details 72 false false R73.htm 9955553 - Disclosure - Deposits - Schedule of Maturities of Time Deposits (Details) Sheet http://myopenbank.com/role/DepositsScheduleofMaturitiesofTimeDepositsDetails Deposits - Schedule of Maturities of Time Deposits (Details) Details 73 false false R74.htm 9955554 - Disclosure - Borrowing Arrangements - Additional Information (Details) Sheet http://myopenbank.com/role/BorrowingArrangementsAdditionalInformationDetails Borrowing Arrangements - Additional Information (Details) Details 74 false false R75.htm 9955555 - Disclosure - Borrowing Arrangements - Schedule of Borrowings Available to the Company from Institutions (Details) Sheet http://myopenbank.com/role/BorrowingArrangementsScheduleofBorrowingsAvailabletotheCompanyfromInstitutionsDetails Borrowing Arrangements - Schedule of Borrowings Available to the Company from Institutions (Details) Details 75 false false R76.htm 9955556 - Disclosure - Income Taxes - Schedule of Income Tax Expense (Details) Sheet http://myopenbank.com/role/IncomeTaxesScheduleofIncomeTaxExpenseDetails Income Taxes - Schedule of Income Tax Expense (Details) Details 76 false false R77.htm 9955557 - Disclosure - Income Taxes - Schedule of Effective Tax Rates Differ from Federal Statutory Rates (Details) Sheet http://myopenbank.com/role/IncomeTaxesScheduleofEffectiveTaxRatesDifferfromFederalStatutoryRatesDetails Income Taxes - Schedule of Effective Tax Rates Differ from Federal Statutory Rates (Details) Details 77 false false R78.htm 9955558 - Disclosure - Income Taxes - Schedule of Net Deferred Tax Assets Included in Statement of Financial Position (Details) Sheet http://myopenbank.com/role/IncomeTaxesScheduleofNetDeferredTaxAssetsIncludedinStatementofFinancialPositionDetails Income Taxes - Schedule of Net Deferred Tax Assets Included in Statement of Financial Position (Details) Details 78 false false R79.htm 9955559 - Disclosure - Income Taxes - Additional Information (Details) Sheet http://myopenbank.com/role/IncomeTaxesAdditionalInformationDetails Income Taxes - Additional Information (Details) Details 79 false false R80.htm 9955560 - Disclosure - Commitments and Contingencies - Schedule of Distribution of Undisbursed Credit-Related Commitments (Details) Sheet http://myopenbank.com/role/CommitmentsandContingenciesScheduleofDistributionofUndisbursedCreditRelatedCommitmentsDetails Commitments and Contingencies - Schedule of Distribution of Undisbursed Credit-Related Commitments (Details) Details 80 false false R81.htm 9955561 - Disclosure - Commitments and Contingencies - Schedule of Balance and Total Unfunded Commitments Related to Investment in Low Income Housing Partnerships (Details) Sheet http://myopenbank.com/role/CommitmentsandContingenciesScheduleofBalanceandTotalUnfundedCommitmentsRelatedtoInvestmentinLowIncomeHousingPartnershipsDetails Commitments and Contingencies - Schedule of Balance and Total Unfunded Commitments Related to Investment in Low Income Housing Partnerships (Details) Details 81 false false R82.htm 9955562 - Disclosure - Commitments and Contingencies - Additional Information (Details) Sheet http://myopenbank.com/role/CommitmentsandContingenciesAdditionalInformationDetails Commitments and Contingencies - Additional Information (Details) Details 82 false false R83.htm 9955563 - Disclosure - Stock-Based Compensation - Additional Information (Details) Sheet http://myopenbank.com/role/StockBasedCompensationAdditionalInformationDetails Stock-Based Compensation - Additional Information (Details) Details 83 false false R84.htm 9955564 - Disclosure - Stock-Based Compensation - Schedule of Stock-based Compensation Stock Options Activity (Details) Sheet http://myopenbank.com/role/StockBasedCompensationScheduleofStockbasedCompensationStockOptionsActivityDetails Stock-Based Compensation - Schedule of Stock-based Compensation Stock Options Activity (Details) Details 84 false false R85.htm 9955565 - Disclosure - Stock-Based Compensation - Schedule of Information Related to Stock Option Plan (Details) Sheet http://myopenbank.com/role/StockBasedCompensationScheduleofInformationRelatedtoStockOptionPlanDetails Stock-Based Compensation - Schedule of Information Related to Stock Option Plan (Details) Details 85 false false R86.htm 9955566 - Disclosure - Stock-Based Compensation - Schedule of Changes in Non-vested Restricted Stock Awards (Details) Sheet http://myopenbank.com/role/StockBasedCompensationScheduleofChangesinNonvestedRestrictedStockAwardsDetails Stock-Based Compensation - Schedule of Changes in Non-vested Restricted Stock Awards (Details) Details 86 false false R87.htm 9955567 - Disclosure - Employee Benefit Plan - Additional Information (Details) Sheet http://myopenbank.com/role/EmployeeBenefitPlanAdditionalInformationDetails Employee Benefit Plan - Additional Information (Details) Details 87 false false R88.htm 9955568 - Disclosure - Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsScheduleofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetails Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) Details 88 false false R89.htm 9955569 - Disclosure - Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy and Fair Value of Assets that Were Still Held and Had Fair Value Adjustments Measured On a Nonrecurring Basis (Details) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsScheduleofFairValueHierarchyandFairValueofAssetsthatWereStillHeldandHadFairValueAdjustmentsMeasuredOnaNonrecurringBasisDetails Fair Value of Financial Instruments - Schedule of Fair Value Hierarchy and Fair Value of Assets that Were Still Held and Had Fair Value Adjustments Measured On a Nonrecurring Basis (Details) Details 89 false false R90.htm 9955570 - Disclosure - Fair Value of Financial Instruments - Schedule of Increase (Decrease) in Value of Certain Assets Held at End of Respective Reporting Periods Presented for Which a Nonrecurring Fair Value Adjustment (Details) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsScheduleofIncreaseDecreaseinValueofCertainAssetsHeldatEndofRespectiveReportingPeriodsPresentedforWhichaNonrecurringFairValueAdjustmentDetails Fair Value of Financial Instruments - Schedule of Increase (Decrease) in Value of Certain Assets Held at End of Respective Reporting Periods Presented for Which a Nonrecurring Fair Value Adjustment (Details) Details 90 false false R91.htm 9955571 - Disclosure - Fair Value of Financial Instruments - Schedule of Information about Significant Unobservable Inputs Utilized in Company's Nonrecurring Level 3 Fair Value Measurements (Details) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsScheduleofInformationaboutSignificantUnobservableInputsUtilizedinCompanysNonrecurringLevel3FairValueMeasurementsDetails Fair Value of Financial Instruments - Schedule of Information about Significant Unobservable Inputs Utilized in Company's Nonrecurring Level 3 Fair Value Measurements (Details) Details 91 false false R92.htm 9955572 - Disclosure - Fair Value of Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Sheet http://myopenbank.com/role/FairValueofFinancialInstrumentsScheduleofCarryingAmountsandEstimatedFairValuesofFinancialInstrumentsDetails Fair Value of Financial Instruments - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) Details 92 false false R93.htm 9955573 - Disclosure - Derivative Financial Instruments - Narrative (Details) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsNarrativeDetails Derivative Financial Instruments - Narrative (Details) Details 93 false false R94.htm 9955574 - Disclosure - Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsScheduleofDerivativeFinancialInstrumentsDetails Derivative Financial Instruments - Schedule of Derivative Financial Instruments (Details) Details 94 false false R95.htm 9955575 - Disclosure - Derivative Financial Instruments - Schedule of Cash Flow Hedge Accounting on Accumulated OCI (Details) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsScheduleofCashFlowHedgeAccountingonAccumulatedOCIDetails Derivative Financial Instruments - Schedule of Cash Flow Hedge Accounting on Accumulated OCI (Details) Details 95 false false R96.htm 9955576 - Disclosure - Derivative Financial Instruments - Schedule of Derivative Instruments, Effect on Statement of Income (Details) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsScheduleofDerivativeInstrumentsEffectonStatementofIncomeDetails Derivative Financial Instruments - Schedule of Derivative Instruments, Effect on Statement of Income (Details) Details 96 false false R97.htm 9955577 - Disclosure - Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) Sheet http://myopenbank.com/role/DerivativeFinancialInstrumentsOffsettingAssetsandLiabilitiesDetails Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) Details 97 false false R98.htm 9955578 - Disclosure - Regulatory Capital Matters - Additional Information (Details) Sheet http://myopenbank.com/role/RegulatoryCapitalMattersAdditionalInformationDetails Regulatory Capital Matters - Additional Information (Details) Details 98 false false R99.htm 9955579 - Disclosure - Regulatory Capital Matters - Schedule of Actual and Required Capital Amounts and Ratios, Exclusive of Capital Conservation Buffer (Details) Sheet http://myopenbank.com/role/RegulatoryCapitalMattersScheduleofActualandRequiredCapitalAmountsandRatiosExclusiveofCapitalConservationBufferDetails Regulatory Capital Matters - Schedule of Actual and Required Capital Amounts and Ratios, Exclusive of Capital Conservation Buffer (Details) Details 99 false false R100.htm 9955580 - Disclosure - Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) Sheet http://myopenbank.com/role/EarningsPerShareScheduleofComputationofBasicandDilutedEarningsPerShareDetails Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) Details 100 false false R101.htm 9955581 - Disclosure - Earnings Per Share - Additional Information (Details) Sheet http://myopenbank.com/role/EarningsPerShareAdditionalInformationDetails Earnings Per Share - Additional Information (Details) Details 101 false false R102.htm 9955582 - Disclosure - Parent Company Condensed Financial Statements - Schedule of Condensed Balance Sheets (Details) Sheet http://myopenbank.com/role/ParentCompanyCondensedFinancialStatementsScheduleofCondensedBalanceSheetsDetails Parent Company Condensed Financial Statements - Schedule of Condensed Balance Sheets (Details) Details 102 false false R103.htm 9955583 - Disclosure - Parent Company Condensed Financial Statements - Schedule of Condensed Statements of Income and Comprehensive Income (Details) Sheet http://myopenbank.com/role/ParentCompanyCondensedFinancialStatementsScheduleofCondensedStatementsofIncomeandComprehensiveIncomeDetails Parent Company Condensed Financial Statements - Schedule of Condensed Statements of Income and Comprehensive Income (Details) Details 103 false false R104.htm 9955584 - Disclosure - Parent Company Condensed Financial Statements - Schedule of Condensed Statements of Cash Flows (Details) Sheet http://myopenbank.com/role/ParentCompanyCondensedFinancialStatementsScheduleofCondensedStatementsofCashFlowsDetails Parent Company Condensed Financial Statements - Schedule of Condensed Statements of Cash Flows (Details) Details 104 false false All Reports Book All Reports opbk-20241231.htm opbk-20241231.xsd opbk-20241231_cal.xml opbk-20241231_def.xml opbk-20241231_lab.xml opbk-20241231_pre.xml http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/cyd/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/ecd/2024 true true