3.24.2 html 359 623 1 true 71 0 false 4 false false R1.htm 0000001 - Document - Document and Entity Information Document Sheet http://www.carverbank.com/role/DocumentandEntityInformationDocument Document and Entity Information Document Cover 1 false false R2.htm 0000002 - Document - Audit Information Sheet http://www.carverbank.com/role/AuditInformation Audit Information Cover 2 false false R3.htm 9952151 - Document - Cover Page Sheet http://www.carverbank.com/role/CoverPage Cover Page Cover 3 false false R4.htm 9952152 - Statement - Consolidated Statements of Financial Condition Sheet http://www.carverbank.com/role/ConsolidatedStatementsofFinancialCondition Consolidated Statements of Financial Condition Statements 4 false false R5.htm 9952153 - Statement - Consolidated Statements of Financial Condition Parentheticals Sheet http://www.carverbank.com/role/ConsolidatedStatementsofFinancialConditionParentheticals Consolidated Statements of Financial Condition Parentheticals Statements 5 false false R6.htm 9952154 - Statement - Consolidated Statements of Operations Sheet http://www.carverbank.com/role/ConsolidatedStatementsofOperations Consolidated Statements of Operations Statements 6 false false R7.htm 9952155 - Statement - Consolidated Statements of Comprehensive Loss Sheet http://www.carverbank.com/role/ConsolidatedStatementsofComprehensiveLoss Consolidated Statements of Comprehensive Loss Statements 7 false false R8.htm 9952156 - Statement - Consolidated Statement of Changes in Equity Sheet http://www.carverbank.com/role/ConsolidatedStatementofChangesinEquity Consolidated Statement of Changes in Equity Statements 8 false false R9.htm 9952157 - Statement - Consolidated Statements of Cash Flows Sheet http://www.carverbank.com/role/ConsolidatedStatementsofCashFlows Consolidated Statements of Cash Flows Statements 9 false false R10.htm 9952158 - Disclosure - Organization Sheet http://www.carverbank.com/role/Organization Organization Notes 10 false false R11.htm 9952159 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.carverbank.com/role/SummaryofSignificantAccountingPolicies Summary of Significant Accounting Policies Notes 11 false false R12.htm 9952160 - Disclosure - Investment Securities Sheet http://www.carverbank.com/role/InvestmentSecurities Investment Securities Notes 12 false false R13.htm 9952161 - Disclosure - Loans Receivable and Allowance for Credit Losses Sheet http://www.carverbank.com/role/LoansReceivableandAllowanceforCreditLosses Loans Receivable and Allowance for Credit Losses Notes 13 false false R14.htm 9952162 - Disclosure - Premises and Equipment, Net Sheet http://www.carverbank.com/role/PremisesandEquipmentNet Premises and Equipment, Net Notes 14 false false R15.htm 9952163 - Disclosure - Leases Sheet http://www.carverbank.com/role/Leases Leases Notes 15 false false R16.htm 9952164 - Disclosure - Accrued Interest Receivable Sheet http://www.carverbank.com/role/AccruedInterestReceivable Accrued Interest Receivable Notes 16 false false R17.htm 9952165 - Disclosure - Deposits Sheet http://www.carverbank.com/role/Deposits Deposits Notes 17 false false R18.htm 9952166 - Disclosure - Borrowed Money Sheet http://www.carverbank.com/role/BorrowedMoney Borrowed Money Notes 18 false false R19.htm 9952167 - Disclosure - Income Taxes Sheet http://www.carverbank.com/role/IncomeTaxes Income Taxes Notes 19 false false R20.htm 9952168 - Disclosure - Earnings (Loss) Per Common Share Sheet http://www.carverbank.com/role/EarningsLossPerCommonShare Earnings (Loss) Per Common Share Notes 20 false false R21.htm 9952169 - Disclosure - Stockholders' Equity Sheet http://www.carverbank.com/role/StockholdersEquity Stockholders' Equity Notes 21 false false R22.htm 9952170 - Disclosure - Other Comprehensive Income (Loss) Sheet http://www.carverbank.com/role/OtherComprehensiveIncomeLoss Other Comprehensive Income (Loss) Notes 22 false false R23.htm 9952171 - Disclosure - Employee Benefit and Stock Compensation Plans Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlans Employee Benefit and Stock Compensation Plans Notes 23 false false R24.htm 9952172 - Disclosure - Commitments and Contingencies Sheet http://www.carverbank.com/role/CommitmentsandContingencies Commitments and Contingencies Notes 24 false false R25.htm 9952173 - Disclosure - Fair Value Measurements Sheet http://www.carverbank.com/role/FairValueMeasurements Fair Value Measurements Notes 25 false false R26.htm 9952174 - Disclosure - Fair Value of Financial Instruments Sheet http://www.carverbank.com/role/FairValueofFinancialInstruments Fair Value of Financial Instruments Notes 26 false false R27.htm 9952175 - Disclosure - Variable Interest Entities Sheet http://www.carverbank.com/role/VariableInterestEntities Variable Interest Entities Notes 27 false false R28.htm 9952176 - Disclosure - Non-interest Revenue and Expense Sheet http://www.carverbank.com/role/NoninterestRevenueandExpense Non-interest Revenue and Expense Notes 28 false false R29.htm 9952177 - Disclosure - Carver Bancorp Inc.-Parent Company Only Sheet http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnly Carver Bancorp Inc.-Parent Company Only Notes 29 false false R30.htm 9952178 - Disclosure - Subsequent Events Sheet http://www.carverbank.com/role/SubsequentEvents Subsequent Events Notes 30 false false R31.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 31 false false R32.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 32 false false R33.htm 9954471 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.carverbank.com/role/SummaryofSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) Policies http://www.carverbank.com/role/SummaryofSignificantAccountingPolicies 33 false false R34.htm 9954472 - Disclosure - Investment Securities (Tables) Sheet http://www.carverbank.com/role/InvestmentSecuritiesTables Investment Securities (Tables) Tables http://www.carverbank.com/role/InvestmentSecurities 34 false false R35.htm 9954473 - Disclosure - Loans Receivable and ACL (Tables) Sheet http://www.carverbank.com/role/LoansReceivableandACLTables Loans Receivable and ACL (Tables) Tables http://www.carverbank.com/role/LoansReceivableandAllowanceforCreditLosses 35 false false R36.htm 9954474 - Disclosure - Premises and Equipment, Net (Tables) Sheet http://www.carverbank.com/role/PremisesandEquipmentNetTables Premises and Equipment, Net (Tables) Tables http://www.carverbank.com/role/PremisesandEquipmentNet 36 false false R37.htm 9954475 - Disclosure - Leases (Tables) Sheet http://www.carverbank.com/role/LeasesTables Leases (Tables) Tables http://www.carverbank.com/role/Leases 37 false false R38.htm 9954476 - Disclosure - Accrued Interest Receivable (Tables) Sheet http://www.carverbank.com/role/AccruedInterestReceivableTables Accrued Interest Receivable (Tables) Tables http://www.carverbank.com/role/AccruedInterestReceivable 38 false false R39.htm 9954477 - Disclosure - Deposits (Tables) Sheet http://www.carverbank.com/role/DepositsTables Deposits (Tables) Tables http://www.carverbank.com/role/Deposits 39 false false R40.htm 9954478 - Disclosure - Borrowed Money (Tables) Sheet http://www.carverbank.com/role/BorrowedMoneyTables Borrowed Money (Tables) Tables http://www.carverbank.com/role/BorrowedMoney 40 false false R41.htm 9954479 - Disclosure - Income Taxes (Tables) Sheet http://www.carverbank.com/role/IncomeTaxesTables Income Taxes (Tables) Tables http://www.carverbank.com/role/IncomeTaxes 41 false false R42.htm 9954480 - Disclosure - Earnings (Loss) Per Common Share (Tables) Sheet http://www.carverbank.com/role/EarningsLossPerCommonShareTables Earnings (Loss) Per Common Share (Tables) Tables http://www.carverbank.com/role/EarningsLossPerCommonShare 42 false false R43.htm 9954481 - Disclosure - Stockholders' Equity (Tables) Sheet http://www.carverbank.com/role/StockholdersEquityTables Stockholders' Equity (Tables) Tables http://www.carverbank.com/role/StockholdersEquity 43 false false R44.htm 9954482 - Disclosure - Other Comprehensive Income (Loss) (Tables) Sheet http://www.carverbank.com/role/OtherComprehensiveIncomeLossTables Other Comprehensive Income (Loss) (Tables) Tables http://www.carverbank.com/role/OtherComprehensiveIncomeLoss 44 false false R45.htm 9954483 - Disclosure - Employee Benefit and Stock Compensation Plans (Tables) Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansTables Employee Benefit and Stock Compensation Plans (Tables) Tables http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlans 45 false false R46.htm 9954484 - Disclosure - Commitments and Contingencies (Tables) Sheet http://www.carverbank.com/role/CommitmentsandContingenciesTables Commitments and Contingencies (Tables) Tables http://www.carverbank.com/role/CommitmentsandContingencies 46 false false R47.htm 9954485 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.carverbank.com/role/FairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.carverbank.com/role/FairValueMeasurements 47 false false R48.htm 9954486 - Disclosure - Fair Value of Financial Instruments (Tables) Sheet http://www.carverbank.com/role/FairValueofFinancialInstrumentsTables Fair Value of Financial Instruments (Tables) Tables http://www.carverbank.com/role/FairValueofFinancialInstruments 48 false false R49.htm 9954487 - Disclosure - Non-interest Revenue and Expense (Tables) Sheet http://www.carverbank.com/role/NoninterestRevenueandExpenseTables Non-interest Revenue and Expense (Tables) Tables http://www.carverbank.com/role/NoninterestRevenueandExpense 49 false false R50.htm 9954488 - Disclosure - Carver Bancorp Inc.-Parent Company Only (Tables) Sheet http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnlyTables Carver Bancorp Inc.-Parent Company Only (Tables) Tables http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnly 50 false false R51.htm 9954489 - Disclosure - Organization Text Tag (Details) Sheet http://www.carverbank.com/role/OrganizationTextTagDetails Organization Text Tag (Details) Details 51 false false R52.htm 9954490 - Disclosure - Summary of Significant Accounting Policies Text Tag (Details) Sheet http://www.carverbank.com/role/SummaryofSignificantAccountingPoliciesTextTagDetails Summary of Significant Accounting Policies Text Tag (Details) Details http://www.carverbank.com/role/SummaryofSignificantAccountingPoliciesPolicies 52 false false R53.htm 9954491 - Disclosure - Investment Securities Text Tag (Details) Sheet http://www.carverbank.com/role/InvestmentSecuritiesTextTagDetails Investment Securities Text Tag (Details) Details 53 false false R54.htm 9954492 - Disclosure - Investment Securities-Unrealized Gain (Loss) on Investments (Details) Sheet http://www.carverbank.com/role/InvestmentSecuritiesUnrealizedGainLossonInvestmentsDetails Investment Securities-Unrealized Gain (Loss) on Investments (Details) Details 54 false false R55.htm 9954493 - Disclosure - Investment Securities-Schedule of Unrealized Loss on Investments (Details) Sheet http://www.carverbank.com/role/InvestmentSecuritiesScheduleofUnrealizedLossonInvestmentsDetails Investment Securities-Schedule of Unrealized Loss on Investments (Details) Details 55 false false R56.htm 9954494 - Disclosure - Investment Securities-Classified by Contractual Maturity Date (Details) Sheet http://www.carverbank.com/role/InvestmentSecuritiesClassifiedbyContractualMaturityDateDetails Investment Securities-Classified by Contractual Maturity Date (Details) Details 56 false false R57.htm 9954495 - Disclosure - Loans Receivable and ACL (Details) Sheet http://www.carverbank.com/role/LoansReceivableandACLDetails Loans Receivable and ACL (Details) Details http://www.carverbank.com/role/LoansReceivableandACLTables 57 false false R58.htm 9954496 - Disclosure - Allowance for Credit Losses (Details) Sheet http://www.carverbank.com/role/AllowanceforCreditLossesDetails Allowance for Credit Losses (Details) Details 58 false false R59.htm 9954497 - Disclosure - Nonaccrual loans (Details) Sheet http://www.carverbank.com/role/NonaccrualloansDetails Nonaccrual loans (Details) Details 59 false false R60.htm 9954498 - Disclosure - Credit Quality Indicators (Details) Sheet http://www.carverbank.com/role/CreditQualityIndicatorsDetails Credit Quality Indicators (Details) Details 60 false false R61.htm 9954499 - Disclosure - Past Due Financing Receivables (Details) Sheet http://www.carverbank.com/role/PastDueFinancingReceivablesDetails Past Due Financing Receivables (Details) Details 61 false false R62.htm 9954500 - Disclosure - Impaired Loans (Details) Sheet http://www.carverbank.com/role/ImpairedLoansDetails Impaired Loans (Details) Details 62 false false R63.htm 9954501 - Disclosure - Loans Receivable and ACL Text Tag (Details) Sheet http://www.carverbank.com/role/LoansReceivableandACLTextTagDetails Loans Receivable and ACL Text Tag (Details) Details 63 false false R64.htm 9954502 - Disclosure - Premises and Equipment, Net (Details) Sheet http://www.carverbank.com/role/PremisesandEquipmentNetDetails Premises and Equipment, Net (Details) Details http://www.carverbank.com/role/PremisesandEquipmentNetTables 64 false false R65.htm 9954503 - Disclosure - Premises and Equipment, Net Text Tag (Details) Sheet http://www.carverbank.com/role/PremisesandEquipmentNetTextTagDetails Premises and Equipment, Net Text Tag (Details) Details 65 false false R66.htm 9954504 - Disclosure - Leases (Details) Sheet http://www.carverbank.com/role/LeasesDetails Leases (Details) Details http://www.carverbank.com/role/LeasesTables 66 false false R67.htm 9954505 - Disclosure - Leases-Lease Liability, Maturity (Details) Sheet http://www.carverbank.com/role/LeasesLeaseLiabilityMaturityDetails Leases-Lease Liability, Maturity (Details) Details 67 false false R68.htm 9954506 - Disclosure - Leases Text Tags (Details) Sheet http://www.carverbank.com/role/LeasesTextTagsDetails Leases Text Tags (Details) Details 68 false false R69.htm 9954507 - Disclosure - Accrued Interest Receivable (Details) Sheet http://www.carverbank.com/role/AccruedInterestReceivableDetails Accrued Interest Receivable (Details) Details http://www.carverbank.com/role/AccruedInterestReceivableTables 69 false false R70.htm 9954508 - Disclosure - Deposits-Liabilities by Type (Details) Sheet http://www.carverbank.com/role/DepositsLiabilitiesbyTypeDetails Deposits-Liabilities by Type (Details) Details 70 false false R71.htm 9954509 - Disclosure - Deposits-CD Maturities (Details) Sheet http://www.carverbank.com/role/DepositsCDMaturitiesDetails Deposits-CD Maturities (Details) Details 71 false false R72.htm 9954510 - Disclosure - Deposits-Interest Expense (Details) Sheet http://www.carverbank.com/role/DepositsInterestExpenseDetails Deposits-Interest Expense (Details) Details 72 false false R73.htm 9954511 - Disclosure - Deposits-Other Deposit Liabilities (Details) Sheet http://www.carverbank.com/role/DepositsOtherDepositLiabilitiesDetails Deposits-Other Deposit Liabilities (Details) Details 73 false false R74.htm 9954512 - Disclosure - Borrowed Money Text Tag (Details) Sheet http://www.carverbank.com/role/BorrowedMoneyTextTagDetails Borrowed Money Text Tag (Details) Details 74 false false R75.htm 9954513 - Disclosure - Borrowed Money FHLB Advances (Details) Sheet http://www.carverbank.com/role/BorrowedMoneyFHLBAdvancesDetails Borrowed Money FHLB Advances (Details) Details 75 false false R76.htm 9954514 - Disclosure - Borrowed Money Maturities (Details) Sheet http://www.carverbank.com/role/BorrowedMoneyMaturitiesDetails Borrowed Money Maturities (Details) Details 76 false false R77.htm 9954515 - Disclosure - Borrowed Money (Details) Sheet http://www.carverbank.com/role/BorrowedMoneyDetails Borrowed Money (Details) Details http://www.carverbank.com/role/BorrowedMoneyTables 77 false false R78.htm 9954516 - Disclosure - Income Taxes-Effective Income Tax Rate Reconciliation (Details) Sheet http://www.carverbank.com/role/IncomeTaxesEffectiveIncomeTaxRateReconciliationDetails Income Taxes-Effective Income Tax Rate Reconciliation (Details) Details 78 false false R79.htm 9954517 - Disclosure - Income Taxes-Deferred Tax Assets and Liabilities (Details) Sheet http://www.carverbank.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails Income Taxes-Deferred Tax Assets and Liabilities (Details) Details 79 false false R80.htm 9954518 - Disclosure - Income Taxes Text Tag (Details) Sheet http://www.carverbank.com/role/IncomeTaxesTextTagDetails Income Taxes Text Tag (Details) Details 80 false false R81.htm 9954519 - Disclosure - Earnings (Loss) Per Common Share (Details) Sheet http://www.carverbank.com/role/EarningsLossPerCommonShareDetails Earnings (Loss) Per Common Share (Details) Details http://www.carverbank.com/role/EarningsLossPerCommonShareTables 81 false false R82.htm 9954520 - Disclosure - Stockholders' Equity Text Tag (Details) Sheet http://www.carverbank.com/role/StockholdersEquityTextTagDetails Stockholders' Equity Text Tag (Details) Details 82 false false R83.htm 9954521 - Disclosure - Stockholders' Equity-Schedule of Compliance with Regulatory Capital Requirements (Details) Sheet http://www.carverbank.com/role/StockholdersEquityScheduleofCompliancewithRegulatoryCapitalRequirementsDetails Stockholders' Equity-Schedule of Compliance with Regulatory Capital Requirements (Details) Details 83 false false R84.htm 9954522 - Disclosure - Other Comprehensive Income (Loss) - Components of AOCI (Details) Sheet http://www.carverbank.com/role/OtherComprehensiveIncomeLossComponentsofAOCIDetails Other Comprehensive Income (Loss) - Components of AOCI (Details) Details http://www.carverbank.com/role/OtherComprehensiveIncomeLossTables 84 false false R85.htm 9954523 - Disclosure - Other Comprehensive Income (Loss) Text Tag (Details) Sheet http://www.carverbank.com/role/OtherComprehensiveIncomeLossTextTagDetails Other Comprehensive Income (Loss) Text Tag (Details) Details http://www.carverbank.com/role/OtherComprehensiveIncomeLossTables 85 false false R86.htm 9954524 - Disclosure - Employee Benefit and Stock Compensation Plans Text Tag (Details) Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansTextTagDetails Employee Benefit and Stock Compensation Plans Text Tag (Details) Details http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansTables 86 false false R87.htm 9954525 - Disclosure - Employee Benefit and Stock Compensation Plans-Restricted Stock, Activity (Details) Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansRestrictedStockActivityDetails Employee Benefit and Stock Compensation Plans-Restricted Stock, Activity (Details) Details 87 false false R88.htm 9954526 - Disclosure - Employee Benefit and Stock Compensation Plans-Stock Options, Activity (Details) Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansStockOptionsActivityDetails Employee Benefit and Stock Compensation Plans-Stock Options, Activity (Details) Details 88 false false R89.htm 9954527 - Disclosure - Employee Benefit and Stock Compensation Plans-Stock Options, by Exercise Price Range (Details) Sheet http://www.carverbank.com/role/EmployeeBenefitandStockCompensationPlansStockOptionsbyExercisePriceRangeDetails Employee Benefit and Stock Compensation Plans-Stock Options, by Exercise Price Range (Details) Details 89 false false R90.htm 9954528 - Disclosure - Commitments and Contingencies (Details) Sheet http://www.carverbank.com/role/CommitmentsandContingenciesDetails Commitments and Contingencies (Details) Details http://www.carverbank.com/role/CommitmentsandContingenciesTables 90 false false R91.htm 9954529 - Disclosure - Commitments and Contingencies-Repurchase Request (Details) Sheet http://www.carverbank.com/role/CommitmentsandContingenciesRepurchaseRequestDetails Commitments and Contingencies-Repurchase Request (Details) Details 91 false false R92.htm 9954530 - Disclosure - Commitments and Contingencies-Representation and Warranty Reserves (Details) Sheet http://www.carverbank.com/role/CommitmentsandContingenciesRepresentationandWarrantyReservesDetails Commitments and Contingencies-Representation and Warranty Reserves (Details) Details 92 false false R93.htm 9954531 - Disclosure - Fair Value Measurements-Assets Measured on Recurring basis (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsAssetsMeasuredonRecurringbasisDetails Fair Value Measurements-Assets Measured on Recurring basis (Details) Details 93 false false R94.htm 9954532 - Disclosure - Fair Value Measurements-Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsAssetsMeasuredonRecurringBasisUnobservableInputReconciliationDetails Fair Value Measurements-Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) Details 94 false false R95.htm 9954533 - Disclosure - Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsFairValueAssetsMeasuredonRecurringBasisValuationTechniquesDetails Fair Value Measurements Fair Value, Assets Measured on Recurring Basis, Valuation Techniques (Details) Details 95 false false R96.htm 9954534 - Disclosure - Fair Value Measurements Fair Value on a Non-recurring basis (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsFairValueonaNonrecurringbasisDetails Fair Value Measurements Fair Value on a Non-recurring basis (Details) Details 96 false false R97.htm 9954535 - Disclosure - Fair Value Measurements-Assets Measured on a Non-recurring basis, Valuation Techniques (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsAssetsMeasuredonaNonrecurringbasisValuationTechniquesDetails Fair Value Measurements-Assets Measured on a Non-recurring basis, Valuation Techniques (Details) Details 97 false false R98.htm 9954536 - Disclosure - Fair Value Measurements Text Tag (Details) Sheet http://www.carverbank.com/role/FairValueMeasurementsTextTagDetails Fair Value Measurements Text Tag (Details) Details 98 false false R99.htm 9954537 - Disclosure - Fair Value of Financial Instruments (Details) Sheet http://www.carverbank.com/role/FairValueofFinancialInstrumentsDetails Fair Value of Financial Instruments (Details) Details http://www.carverbank.com/role/FairValueofFinancialInstrumentsTables 99 false false R100.htm 9954538 - Disclosure - Variable Interest Entities Text Tag (Details) Sheet http://www.carverbank.com/role/VariableInterestEntitiesTextTagDetails Variable Interest Entities Text Tag (Details) Details 100 false false R101.htm 9954539 - Disclosure - Disaggregation of Revenue (Details) Sheet http://www.carverbank.com/role/DisaggregationofRevenueDetails Disaggregation of Revenue (Details) Details 101 false false R102.htm 9954540 - Disclosure - Other Non-interest Income and Expense (Details) Sheet http://www.carverbank.com/role/OtherNoninterestIncomeandExpenseDetails Other Non-interest Income and Expense (Details) Details 102 false false R103.htm 9954541 - Disclosure - Carver Bancorp Inc.-Parent Company Only-Condensed Statements of Financial Condition (Details) Sheet http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnlyCondensedStatementsofFinancialConditionDetails Carver Bancorp Inc.-Parent Company Only-Condensed Statements of Financial Condition (Details) Details 103 false false R104.htm 9954542 - Disclosure - Carver Bancorp Inc.- Parent Company Only-Condensed Statements of Operations (Details) Sheet http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnlyCondensedStatementsofOperationsDetails Carver Bancorp Inc.- Parent Company Only-Condensed Statements of Operations (Details) Details 104 false false R105.htm 9954543 - Disclosure - Carver Bancorp Inc.- Parent Company Only-Condensed Statements of Cash Flow (Details) Sheet http://www.carverbank.com/role/CarverBancorpIncParentCompanyOnlyCondensedStatementsofCashFlowDetails Carver Bancorp Inc.- Parent Company Only-Condensed Statements of Cash Flow (Details) Details 105 false false R106.htm 9954544 - Disclosure - Subsequent Events Text Tag (Details) Sheet http://www.carverbank.com/role/SubsequentEventsTextTagDetails Subsequent Events Text Tag (Details) Details 106 false false All Reports Book All Reports carv-20240331.htm carv-20240331.xsd carv-20240331_cal.xml carv-20240331_def.xml carv-20240331_lab.xml carv-20240331_pre.xml http://fasb.org/srt/2024 http://fasb.org/us-gaap/2024 http://xbrl.sec.gov/dei/2024 http://xbrl.sec.gov/ecd/2024 true true