3.25.4 html 458 633 1 false 110 0 false 8 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://hanoverbank.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfFinancialCondition CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Statements 2 false false R3.htm 995200105 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONSOLIDATED STATEMENTS OF INCOME Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfIncome CONSOLIDATED STATEMENTS OF INCOME Statements 4 false false R5.htm 995200300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 995200305 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfComprehensiveIncomeParenthetical CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) Statements 6 false false R7.htm 995200400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 7 false false R8.htm 995200405 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Statements 8 false false R9.htm 995200500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://hanoverbank.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 9 false false R10.htm 995210101 - Disclosure - Summary of Significant Accounting Policies Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 10 false false R11.htm 995210201 - Disclosure - Investment Securities Sheet http://hanoverbank.com/role/DisclosureInvestmentSecurities Investment Securities Notes 11 false false R12.htm 995210301 - Disclosure - Loans Sheet http://hanoverbank.com/role/DisclosureLoans Loans Notes 12 false false R13.htm 995210401 - Disclosure - Premises and Equipment Sheet http://hanoverbank.com/role/DisclosurePremisesAndEquipment Premises and Equipment Notes 13 false false R14.htm 995210501 - Disclosure - Leases Sheet http://hanoverbank.com/role/DisclosureLeases Leases Notes 14 false false R15.htm 995210601 - Disclosure - Deposits Sheet http://hanoverbank.com/role/DisclosureDeposits Deposits Notes 15 false false R16.htm 995210701 - Disclosure - Borrowings Sheet http://hanoverbank.com/role/DisclosureBorrowings Borrowings Notes 16 false false R17.htm 995210801 - Disclosure - Subordinated Debentures Sheet http://hanoverbank.com/role/DisclosureSubordinatedDebentures Subordinated Debentures Notes 17 false false R18.htm 995210901 - Disclosure - Derivatives Sheet http://hanoverbank.com/role/DisclosureDerivatives Derivatives Notes 18 false false R19.htm 995211001 - Disclosure - Goodwill and Other Intangible Assets Sheet http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 19 false false R20.htm 995211101 - Disclosure - Income Taxes Sheet http://hanoverbank.com/role/DisclosureIncomeTaxes Income Taxes Notes 20 false false R21.htm 995211201 - Disclosure - Equity Compensation Plans Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlans Equity Compensation Plans Notes 21 false false R22.htm 995211301 - Disclosure - Related Party Transactions Sheet http://hanoverbank.com/role/DisclosureRelatedPartyTransactions Related Party Transactions Notes 22 false false R23.htm 995211401 - Disclosure - Loan Commitments and Other Related Activities Sheet http://hanoverbank.com/role/DisclosureLoanCommitmentsAndOtherRelatedActivities Loan Commitments and Other Related Activities Notes 23 false false R24.htm 995211501 - Disclosure - Regulatory Matters Sheet http://hanoverbank.com/role/DisclosureRegulatoryMatters Regulatory Matters Notes 24 false false R25.htm 995211601 - Disclosure - Fair Value Measurements Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 25 false false R26.htm 995211701 - Disclosure - Parent Company Only Condensed Financial Information Sheet http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformation Parent Company Only Condensed Financial Information Notes 26 false false R27.htm 995211801 - Disclosure - Earnings Per Share Sheet http://hanoverbank.com/role/DisclosureEarningsPerShare Earnings Per Share Notes 27 false false R28.htm 995211901 - Disclosure - Accumulated Other Comprehensive (Loss) Income Sheet http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncome Accumulated Other Comprehensive (Loss) Income Notes 28 false false R29.htm 995212001 - Disclosure - Segment Information Sheet http://hanoverbank.com/role/DisclosureSegmentInformation Segment Information Notes 29 false false R30.htm 995212101 - Disclosure - Revenue from Contracts with Customers Sheet http://hanoverbank.com/role/DisclosureRevenueFromContractsWithCustomers Revenue from Contracts with Customers Notes 30 false false R31.htm 995212201 - Disclosure - Subsequent Events Sheet http://hanoverbank.com/role/DisclosureSubsequentEvents Subsequent Events Notes 31 false false R32.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 32 false false R33.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 33 false false R34.htm 995447 - Disclosure - Insider Trading Policies and Procedures Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc Insider Trading Policies and Procedures Notes 34 false false R35.htm 995550 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure Sheet http://xbrl.sec.gov/cyd/role/CybersecurityRiskManagementAndStrategyDisclosure Cybersecurity Risk Management and Strategy Disclosure Notes 35 false false R36.htm 99920102 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPolicies 36 false false R37.htm 99930203 - Disclosure - Investment Securities (Tables) Sheet http://hanoverbank.com/role/DisclosureInvestmentSecuritiesTables Investment Securities (Tables) Tables http://hanoverbank.com/role/DisclosureInvestmentSecurities 37 false false R38.htm 99930303 - Disclosure - Loans (Tables) Sheet http://hanoverbank.com/role/DisclosureLoansTables Loans (Tables) Tables http://hanoverbank.com/role/DisclosureLoans 38 false false R39.htm 99930403 - Disclosure - Premises and Equipment (Tables) Sheet http://hanoverbank.com/role/DisclosurePremisesAndEquipmentTables Premises and Equipment (Tables) Tables http://hanoverbank.com/role/DisclosurePremisesAndEquipment 39 false false R40.htm 99930503 - Disclosure - Leases (Tables) Sheet http://hanoverbank.com/role/DisclosureLeasesTables Leases (Tables) Tables http://hanoverbank.com/role/DisclosureLeases 40 false false R41.htm 99930603 - Disclosure - Deposits (Tables) Sheet http://hanoverbank.com/role/DisclosureDepositsTables Deposits (Tables) Tables http://hanoverbank.com/role/DisclosureDeposits 41 false false R42.htm 99930703 - Disclosure - Borrowings (Tables) Sheet http://hanoverbank.com/role/DisclosureBorrowingsTables Borrowings (Tables) Tables http://hanoverbank.com/role/DisclosureBorrowings 42 false false R43.htm 99930903 - Disclosure - Derivatives (Tables) Sheet http://hanoverbank.com/role/DisclosureDerivativesTables Derivatives (Tables) Tables http://hanoverbank.com/role/DisclosureDerivatives 43 false false R44.htm 99931003 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Tables http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssets 44 false false R45.htm 99931103 - Disclosure - Income Taxes (Tables) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://hanoverbank.com/role/DisclosureIncomeTaxes 45 false false R46.htm 99931203 - Disclosure - Equity Compensation Plans (Tables) Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlansTables Equity Compensation Plans (Tables) Tables http://hanoverbank.com/role/DisclosureEquityCompensationPlans 46 false false R47.htm 99931303 - Disclosure - Related Party Transactions (Tables) Sheet http://hanoverbank.com/role/DisclosureRelatedPartyTransactionsTables Related Party Transactions (Tables) Tables http://hanoverbank.com/role/DisclosureRelatedPartyTransactions 47 false false R48.htm 99931403 - Disclosure - Loan Commitments and Other Related Activities (Tables) Sheet http://hanoverbank.com/role/DisclosureLoanCommitmentsAndOtherRelatedActivitiesTables Loan Commitments and Other Related Activities (Tables) Tables http://hanoverbank.com/role/DisclosureLoanCommitmentsAndOtherRelatedActivities 48 false false R49.htm 99931503 - Disclosure - Regulatory Matters (Tables) Sheet http://hanoverbank.com/role/DisclosureRegulatoryMattersTables Regulatory Matters (Tables) Tables http://hanoverbank.com/role/DisclosureRegulatoryMatters 49 false false R50.htm 99931603 - Disclosure - Fair Value Measurements (Tables) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://hanoverbank.com/role/DisclosureFairValueMeasurements 50 false false R51.htm 99931703 - Disclosure - Parent Company Only Condensed Financial Information (Tables) Sheet http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformationTables Parent Company Only Condensed Financial Information (Tables) Tables http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformation 51 false false R52.htm 99931803 - Disclosure - Earnings Per Share (Tables) Sheet http://hanoverbank.com/role/DisclosureEarningsPerShareTables Earnings Per Share (Tables) Tables http://hanoverbank.com/role/DisclosureEarningsPerShare 52 false false R53.htm 99931903 - Disclosure - Accumulated Other Comprehensive (Loss) Income (Tables) Sheet http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncomeTables Accumulated Other Comprehensive (Loss) Income (Tables) Tables http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncome 53 false false R54.htm 99932103 - Disclosure - Revenue from Contracts with Customers (Tables) Sheet http://hanoverbank.com/role/DisclosureRevenueFromContractsWithCustomersTables Revenue from Contracts with Customers (Tables) Tables http://hanoverbank.com/role/DisclosureRevenueFromContractsWithCustomers 54 false false R55.htm 99940101 - Disclosure - Summary of Significant Accounting Policies - Basis of Presentation (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesBasisOfPresentationDetails Summary of Significant Accounting Policies - Basis of Presentation (Details) Details 55 false false R56.htm 99940103 - Disclosure - Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesAllowanceForCreditLossesDetails Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) Details 56 false false R57.htm 99940104 - Disclosure - Summary of Significant Accounting Policies - Servicing Rights (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesServicingRightsDetails Summary of Significant Accounting Policies - Servicing Rights (Details) Details 57 false false R58.htm 99940105 - Disclosure - Summary of Significant Accounting Policies - Foreclosed Assets and Premises and Equipment (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesForeclosedAssetsAndPremisesAndEquipmentDetails Summary of Significant Accounting Policies - Foreclosed Assets and Premises and Equipment (Details) Details 58 false false R59.htm 99940106 - Disclosure - Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesGoodwillAndOtherIntangibleAssetsDetails Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) Details 59 false false R60.htm 99940107 - Disclosure - Summary of Significant Accounting Policies - Operating Segments (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesOperatingSegmentsDetails Summary of Significant Accounting Policies - Operating Segments (Details) Details 60 false false R61.htm 99940108 - Disclosure - Summary of Significant Accounting Policies - Supplemental Executive Retirement Plan (Details) Sheet http://hanoverbank.com/role/DisclosureSummaryOfSignificantAccountingPoliciesSupplementalExecutiveRetirementPlanDetails Summary of Significant Accounting Policies - Supplemental Executive Retirement Plan (Details) Details 61 false false R62.htm 99940201 - Disclosure - Investment Securities - Investment Securities Available for Sale and Held to Maturity (Details) Sheet http://hanoverbank.com/role/DisclosureInvestmentSecuritiesInvestmentSecuritiesAvailableForSaleAndHeldToMaturityDetails Investment Securities - Investment Securities Available for Sale and Held to Maturity (Details) Details 62 false false R63.htm 99940202 - Disclosure - Investment Securities - Securities Portfolio Presented by Contractual Maturity (Details) Sheet http://hanoverbank.com/role/DisclosureInvestmentSecuritiesSecuritiesPortfolioPresentedByContractualMaturityDetails Investment Securities - Securities Portfolio Presented by Contractual Maturity (Details) Details 63 false false R64.htm 99940203 - Disclosure - Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) Sheet http://hanoverbank.com/role/DisclosureInvestmentSecuritiesGrossUnrealizedLossesAndFairValuesOfInvestmentSecuritiesDetails Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) Details 64 false false R65.htm 99940301 - Disclosure - Loans - Major classifications (Details) Sheet http://hanoverbank.com/role/DisclosureLoansMajorClassificationsDetails Loans - Major classifications (Details) Details 65 false false R66.htm 99940302 - Disclosure - Loans - Company's Loans by Year of Origination and Internally Assigned Credit Risk and Gross Charge-offs (Details) Sheet http://hanoverbank.com/role/DisclosureLoansCompanySLoansByYearOfOriginationAndInternallyAssignedCreditRiskAndGrossChargeOffsDetails Loans - Company's Loans by Year of Origination and Internally Assigned Credit Risk and Gross Charge-offs (Details) Details 66 false false R67.htm 99940303 - Disclosure - Loans - Allowance for credit losses on unfunded commitments (Details) Sheet http://hanoverbank.com/role/DisclosureLoansAllowanceForCreditLossesOnUnfundedCommitmentsDetails Loans - Allowance for credit losses on unfunded commitments (Details) Details 67 false false R68.htm 99940304 - Disclosure - Loans - Provision for credit losses on loans and unfunded commitments (Details) Sheet http://hanoverbank.com/role/DisclosureLoansProvisionForCreditLossesOnLoansAndUnfundedCommitmentsDetails Loans - Provision for credit losses on loans and unfunded commitments (Details) Details 68 false false R69.htm 99940305 - Disclosure - Loans - Recorded investment in loans on nonaccrual status and loans past due over 89 days still accruing (Details) Sheet http://hanoverbank.com/role/DisclosureLoansRecordedInvestmentInLoansOnNonaccrualStatusAndLoansPastDueOver89DaysStillAccruingDetails Loans - Recorded investment in loans on nonaccrual status and loans past due over 89 days still accruing (Details) Details 69 false false R70.htm 99940306 - Disclosure - Loans - Amortized cost basis and related allowance for credit loss of individually analyzed loans considered to be collateral dependent (Details) Sheet http://hanoverbank.com/role/DisclosureLoansAmortizedCostBasisAndRelatedAllowanceForCreditLossOfIndividuallyAnalyzedLoansConsideredToBeCollateralDependentDetails Loans - Amortized cost basis and related allowance for credit loss of individually analyzed loans considered to be collateral dependent (Details) Details 70 false false R71.htm 99940307 - Disclosure - Loans - Aging of Recorded Investment in Past Due and Non-accrual Loans by Portfolio Segment (Details) Sheet http://hanoverbank.com/role/DisclosureLoansAgingOfRecordedInvestmentInPastDueAndNonAccrualLoansByPortfolioSegmentDetails Loans - Aging of Recorded Investment in Past Due and Non-accrual Loans by Portfolio Segment (Details) Details 71 false false R72.htm 99940308 - Disclosure - Loans - Modifications (Details) Sheet http://hanoverbank.com/role/DisclosureLoansModificationsDetails Loans - Modifications (Details) Details 72 false false R73.htm 99940309 - Disclosure - Loans - Activity in the allowance by portfolio segment (Details) Sheet http://hanoverbank.com/role/DisclosureLoansActivityInAllowanceByPortfolioSegmentDetails Loans - Activity in the allowance by portfolio segment (Details) Details 73 false false R74.htm 99940401 - Disclosure - Premises and Equipment (Details) Sheet http://hanoverbank.com/role/DisclosurePremisesAndEquipmentDetails Premises and Equipment (Details) Details http://hanoverbank.com/role/DisclosurePremisesAndEquipmentTables 74 false false R75.htm 99940501 - Disclosure - Leases - Additional Information (Details) Sheet http://hanoverbank.com/role/DisclosureLeasesAdditionalInformationDetails Leases - Additional Information (Details) Details 75 false false R76.htm 99940502 - Disclosure - Leases - Future undiscounted lease payments for operating leases (Details) Sheet http://hanoverbank.com/role/DisclosureLeasesFutureUndiscountedLeasePaymentsForOperatingLeasesDetails Leases - Future undiscounted lease payments for operating leases (Details) Details 76 false false R77.htm 99940601 - Disclosure - Deposits (Details) Sheet http://hanoverbank.com/role/DisclosureDepositsDetails Deposits (Details) Details http://hanoverbank.com/role/DisclosureDepositsTables 77 false false R78.htm 99940701 - Disclosure - Borrowings - Federal Home Loan Bank Advances (Details) Sheet http://hanoverbank.com/role/DisclosureBorrowingsFederalHomeLoanBankAdvancesDetails Borrowings - Federal Home Loan Bank Advances (Details) Details 78 false false R79.htm 99940702 - Disclosure - Borrowings - FHLB Advances Contractual Maturities and Weighted Average Interest Rates (Details) Sheet http://hanoverbank.com/role/DisclosureBorrowingsFhlbAdvancesContractualMaturitiesAndWeightedAverageInterestRatesDetails Borrowings - FHLB Advances Contractual Maturities and Weighted Average Interest Rates (Details) Details 79 false false R80.htm 99940703 - Disclosure - Borrowings - Federal Reserve Borrowings and Correspondent Bank Borrowings (Details) Sheet http://hanoverbank.com/role/DisclosureBorrowingsFederalReserveBorrowingsAndCorrespondentBankBorrowingsDetails Borrowings - Federal Reserve Borrowings and Correspondent Bank Borrowings (Details) Details 80 false false R81.htm 99940801 - Disclosure - Subordinated Debentures (Details) Sheet http://hanoverbank.com/role/DisclosureSubordinatedDebenturesDetails Subordinated Debentures (Details) Details http://hanoverbank.com/role/DisclosureSubordinatedDebentures 81 false false R82.htm 99940901 - Disclosure - Derivatives - Cash flow hedges included in the consolidated statements of financial condition (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesCashFlowHedgesIncludedInConsolidatedStatementsOfFinancialConditionDetails Derivatives - Cash flow hedges included in the consolidated statements of financial condition (Details) Details 82 false false R83.htm 99940902 - Disclosure - Derivatives - Additional Information (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesAdditionalInformationDetails Derivatives - Additional Information (Details) Details 83 false false R84.htm 99940903 - Disclosure - Derivatives - Gains (losses) in accumulated other comprehensive income and the consolidated statements, cash flow derivative instruments (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesGainsLossesInAccumulatedOtherComprehensiveIncomeAndConsolidatedStatementsCashFlowDerivativeInstrumentsDetails Derivatives - Gains (losses) in accumulated other comprehensive income and the consolidated statements, cash flow derivative instruments (Details) Details 84 false false R85.htm 99940904 - Disclosure - Derivatives - Fair value hedges on the Consolidated Statements of Income (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesFairValueHedgesOnConsolidatedStatementsOfIncomeDetails Derivatives - Fair value hedges on the Consolidated Statements of Income (Details) Details 85 false false R86.htm 99940905 - Disclosure - Derivatives - Cumulative basis adjustment for fair value hedges (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesCumulativeBasisAdjustmentForFairValueHedgesDetails Derivatives - Cumulative basis adjustment for fair value hedges (Details) Details 86 false false R87.htm 99940906 - Disclosure - Derivatives - Credit-Risk-Related Contingent Features (Details) Sheet http://hanoverbank.com/role/DisclosureDerivativesCreditRiskRelatedContingentFeaturesDetails Derivatives - Credit-Risk-Related Contingent Features (Details) Details 87 false false R88.htm 99941001 - Disclosure - Goodwill and Other Intangible Assets - Activity for Goodwill and Other Intangible Assets (Details) Sheet http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsActivityForGoodwillAndOtherIntangibleAssetsDetails Goodwill and Other Intangible Assets - Activity for Goodwill and Other Intangible Assets (Details) Details 88 false false R89.htm 99941002 - Disclosure - Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) Sheet http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsGrossCarryingAmountAndAccumulatedAmortizationDetails Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) Details 89 false false R90.htm 99941003 - Disclosure - Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Details) Sheet http://hanoverbank.com/role/DisclosureGoodwillAndOtherIntangibleAssetsEstimatedFutureAmortizationExpenseDetails Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Details) Details 90 false false R91.htm 99941101 - Disclosure - Income Taxes - Pretax income from continuing operations (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesPretaxIncomeFromContinuingOperationsDetails Income Taxes - Pretax income from continuing operations (Details) Details 91 false false R92.htm 99941102 - Disclosure - Income Taxes - Income tax expense (benefit) from continuing operations (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesIncomeTaxExpenseBenefitFromContinuingOperationsDetails Income Taxes - Income tax expense (benefit) from continuing operations (Details) Details 92 false false R93.htm 99941103 - Disclosure - Income Taxes - Reconciliation of reported income tax expense (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesReconciliationOfReportedIncomeTaxExpenseDetails Income Taxes - Reconciliation of reported income tax expense (Details) Details 93 false false R94.htm 99941104 - Disclosure - Income Taxes - Components of income taxes paid (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesComponentsOfIncomeTaxesPaidDetails Income Taxes - Components of income taxes paid (Details) Details 94 false false R95.htm 99941105 - Disclosure - Income Taxes - Composition of deferred tax assets and liabilities (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesCompositionOfDeferredTaxAssetsAndLiabilitiesDetails Income Taxes - Composition of deferred tax assets and liabilities (Details) Details 95 false false R96.htm 99941106 - Disclosure - Income Taxes - Net operating loss carryforwards (Details) Sheet http://hanoverbank.com/role/DisclosureIncomeTaxesNetOperatingLossCarryforwardsDetails Income Taxes - Net operating loss carryforwards (Details) Details 96 false false R97.htm 99941201 - Disclosure - Equity Compensation Plans - 2021 and 2018 Equity Compensation Plans (Details) Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlans2021And2018EquityCompensationPlansDetails Equity Compensation Plans - 2021 and 2018 Equity Compensation Plans (Details) Details 97 false false R98.htm 99941202 - Disclosure - Equity Compensation Plans - Stock Options (Details) Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlansStockOptionsDetails Equity Compensation Plans - Stock Options (Details) Details 98 false false R99.htm 99941203 - Disclosure - Equity Compensation Plans - Stock Option Plan (Details) Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlansStockOptionPlanDetails Equity Compensation Plans - Stock Option Plan (Details) Details 99 false false R100.htm 99941204 - Disclosure - Equity Compensation Plans - Restricted Stock (Details) Sheet http://hanoverbank.com/role/DisclosureEquityCompensationPlansRestrictedStockDetails Equity Compensation Plans - Restricted Stock (Details) Details 100 false false R101.htm 99941301 - Disclosure - Related Party Transactions (Details) Sheet http://hanoverbank.com/role/DisclosureRelatedPartyTransactionsDetails Related Party Transactions (Details) Details http://hanoverbank.com/role/DisclosureRelatedPartyTransactionsTables 101 false false R102.htm 99941401 - Disclosure - Loan Commitments and Other Related Activities - Contractual amounts of financial instruments with off-balance sheet risk (Details) Sheet http://hanoverbank.com/role/DisclosureLoanCommitmentsAndOtherRelatedActivitiesContractualAmountsOfFinancialInstrumentsWithOffBalanceSheetRiskDetails Loan Commitments and Other Related Activities - Contractual amounts of financial instruments with off-balance sheet risk (Details) Details 102 false false R103.htm 99941501 - Disclosure - Regulatory Matters (Details) Sheet http://hanoverbank.com/role/DisclosureRegulatoryMattersDetails Regulatory Matters (Details) Details http://hanoverbank.com/role/DisclosureRegulatoryMattersTables 103 false false R104.htm 99941601 - Disclosure - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsAssetsMeasuredAtFairValueOnRecurringBasisDetails Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) Details 104 false false R105.htm 99941602 - Disclosure - Fair Value Measurements - Significant Inputs Utilized in Cash Flow Models (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsSignificantInputsUtilizedInCashFlowModelsDetails Fair Value Measurements - Significant Inputs Utilized in Cash Flow Models (Details) Details 105 false false R106.htm 99941603 - Disclosure - Fair Value Measurements - Changes in Loan Servicing Rights (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsChangesInLoanServicingRightsDetails Fair Value Measurements - Changes in Loan Servicing Rights (Details) Details 106 false false R107.htm 99941604 - Disclosure - Fair Value Measurements - Assets Measured at Fair Value on Non-recurring Basis (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsAssetsMeasuredAtFairValueOnNonRecurringBasisDetails Fair Value Measurements - Assets Measured at Fair Value on Non-recurring Basis (Details) Details 107 false false R108.htm 99941605 - Disclosure - Fair Value Measurements - Quantitative information measured at fair value on non-nonrecurring basis (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsQuantitativeInformationMeasuredAtFairValueOnNonNonrecurringBasisDetails Fair Value Measurements - Quantitative information measured at fair value on non-nonrecurring basis (Details) Details 108 false false R109.htm 99941606 - Disclosure - Fair Value Measurements - Carrying Amount and Fair Value of Financial Instruments (Details) Sheet http://hanoverbank.com/role/DisclosureFairValueMeasurementsCarryingAmountAndFairValueOfFinancialInstrumentsDetails Fair Value Measurements - Carrying Amount and Fair Value of Financial Instruments (Details) Details 109 false false R110.htm 99941701 - Disclosure - Parent Company Only Condensed Financial Information, Balance Sheets (Details) Sheet http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformationBalanceSheetsDetails Parent Company Only Condensed Financial Information, Balance Sheets (Details) Details 110 false false R111.htm 99941702 - Disclosure - Parent Company Only Condensed Financial Information, Statements of Income (Details) Sheet http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformationStatementsOfIncomeDetails Parent Company Only Condensed Financial Information, Statements of Income (Details) Details 111 false false R112.htm 99941703 - Disclosure - Parent Company Only Condensed Financial Information, Statements of Cash Flows (Details) Sheet http://hanoverbank.com/role/DisclosureParentCompanyOnlyCondensedFinancialInformationStatementsOfCashFlowsDetails Parent Company Only Condensed Financial Information, Statements of Cash Flows (Details) Details 112 false false R113.htm 99941801 - Disclosure - Earnings Per Share (Details) Sheet http://hanoverbank.com/role/DisclosureEarningsPerShareDetails Earnings Per Share (Details) Details http://hanoverbank.com/role/DisclosureEarningsPerShareTables 113 false false R114.htm 99941901 - Disclosure - Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (loss) income by Component, Net of Tax (Details) Sheet http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncomeChangesInAccumulatedOtherComprehensiveLossIncomeByComponentNetOfTaxDetails Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive (loss) income by Component, Net of Tax (Details) Details http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncomeTables 114 false false R115.htm 99941902 - Disclosure - Accumulated Other Comprehensive (Loss) Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) Sheet http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncomeReclassificationOutOfAccumulatedOtherComprehensiveIncomeDetails Accumulated Other Comprehensive (Loss) Income - Reclassification Out of Accumulated Other Comprehensive Income (Details) Details http://hanoverbank.com/role/DisclosureAccumulatedOtherComprehensiveLossIncomeTables 115 false false R116.htm 99942001 - Disclosure - Segment Information (Details) Sheet http://hanoverbank.com/role/DisclosureSegmentInformationDetails Segment Information (Details) Details http://hanoverbank.com/role/DisclosureSegmentInformation 116 false false R117.htm 99942101 - Disclosure - Revenue from Contracts with Customers (Details) Sheet http://hanoverbank.com/role/DisclosureRevenueFromContractsWithCustomersDetails Revenue from Contracts with Customers (Details) Details http://hanoverbank.com/role/DisclosureRevenueFromContractsWithCustomersTables 117 false false R118.htm 99942201 - Disclosure - Subsequent Events (Details) Sheet http://hanoverbank.com/role/DisclosureSubsequentEventsDetails Subsequent Events (Details) Details http://hanoverbank.com/role/DisclosureSubsequentEvents 118 false false All Reports Book All Reports hnvr-20251231.xsd hnvr-20251231_cal.xml hnvr-20251231_def.xml hnvr-20251231_lab.xml hnvr-20251231_pre.xml hnvr-20251231x10k.htm hnvr-20251231x10k003.jpg http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/cyd/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true