3.26.1 html 318 326 1 false 70 0 false 6 false false R1.htm 995200090 - Document - Document and Entity Information Sheet http://www.metropolitanbankny.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 995200100 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfFinancialCondition CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Statements 2 false false R3.htm 995200105 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfFinancialConditionParenthetical CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) Statements 3 false false R4.htm 995200200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 995200300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 995200400 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquity CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY Statements 6 false false R7.htm 995200405 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfChangesInStockholdersEquityParenthetical CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) Statements 7 false false R8.htm 995200500 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfCashFlows CONSOLIDATED STATEMENTS OF CASH FLOWS Statements 8 false false R9.htm 995210101 - Disclosure - ORGANIZATION Sheet http://www.metropolitanbankny.com/role/DisclosureOrganization ORGANIZATION Notes 9 false false R10.htm 995210201 - Disclosure - BASIS OF PRESENTATION Sheet http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentation BASIS OF PRESENTATION Notes 10 false false R11.htm 995210301 - Disclosure - SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS Sheet http://www.metropolitanbankny.com/role/DisclosureSummaryOfRecentAccountingPronouncements SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS Notes 11 false false R12.htm 995210401 - Disclosure - INVESTMENT SECURITIES Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecurities INVESTMENT SECURITIES Notes 12 false false R13.htm 995210501 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLosses LOANS AND ALLOWANCE FOR CREDIT LOSSES Notes 13 false false R14.htm 995210601 - Disclosure - BORROWINGS Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowings BORROWINGS Notes 14 false false R15.htm 995210701 - Disclosure - STOCKHOLDERS' EQUITY Sheet http://www.metropolitanbankny.com/role/DisclosureStockholdersEquity STOCKHOLDERS' EQUITY Notes 15 false false R16.htm 995210801 - Disclosure - EARNINGS PER SHARE Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerShare EARNINGS PER SHARE Notes 16 false false R17.htm 995210901 - Disclosure - STOCK COMPENSATION PLAN Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlan STOCK COMPENSATION PLAN Notes 17 false false R18.htm 995211001 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstruments FAIR VALUE OF FINANCIAL INSTRUMENTS Notes 18 false false R19.htm 995211101 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Notes 19 false false R20.htm 995211201 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 20 false false R21.htm 995211301 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS Sheet http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomers REVENUE FROM CONTRACTS WITH CUSTOMERS Notes 21 false false R22.htm 995211401 - Disclosure - DERIVATIVES Sheet http://www.metropolitanbankny.com/role/DisclosureDerivatives DERIVATIVES Notes 22 false false R23.htm 995211501 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.metropolitanbankny.com/role/DisclosureSubsequentEvents SUBSEQUENT EVENTS Notes 23 false false R24.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 24 false false R25.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 25 false false R26.htm 99920202 - Disclosure - BASIS OF PRESENTATION (Policies) Sheet http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentationPolicies BASIS OF PRESENTATION (Policies) Policies 26 false false R27.htm 99930403 - Disclosure - INVESTMENT SECURITIES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables INVESTMENT SECURITIES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureInvestmentSecurities 27 false false R28.htm 99930503 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLosses 28 false false R29.htm 99930603 - Disclosure - BORROWINGS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables BORROWINGS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureBorrowings 29 false false R30.htm 99930803 - Disclosure - EARNINGS PER SHARE (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerShareTables EARNINGS PER SHARE (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureEarningsPerShare 30 false false R31.htm 99930903 - Disclosure - STOCK COMPENSATION PLAN (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables STOCK COMPENSATION PLAN (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlan 31 false false R32.htm 99931003 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsTables FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstruments 32 false false R33.htm 99931103 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss 33 false false R34.htm 99931203 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingencies 34 false false R35.htm 99931303 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomersTables REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomers 35 false false R36.htm 99931403 - Disclosure - DERIVATIVES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureDerivativesTables DERIVATIVES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureDerivatives 36 false false R37.htm 99940201 - Disclosure - BASIS OF PRESENTATION (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentationDetails BASIS OF PRESENTATION (Details) Details http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentationPolicies 37 false false R38.htm 99940401 - Disclosure - INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities available-for-sale) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfAmortizedCostAndFairValueOfSecuritiesAvailableForSaleDetails INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities available-for-sale) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 38 false false R39.htm 99940402 - Disclosure - INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities held-to-maturity) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfAmortizedCostAndFairValueOfSecuritiesHeldToMaturityDetails INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities held-to-maturity) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 39 false false R40.htm 99940403 - Disclosure - INVESTMENT SECURITIES (Schedule of amortized cost and fair value of marketable equity securities) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfAmortizedCostAndFairValueOfMarketableEquitySecuritiesDetails INVESTMENT SECURITIES (Schedule of amortized cost and fair value of marketable equity securities) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 40 false false R41.htm 99940404 - Disclosure - INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfAmortizedCostAndFairValueOfSecuritiesClassifiedByContractualMaturityDetails INVESTMENT SECURITIES (Schedule of Amortized Cost and Fair Value of Securities Classified by Contractual Maturity) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 41 false false R42.htm 99940405 - Disclosure - INVESTMENT SECURITIES (Schedule of Securities with Unrealized/Unrecognized Losses) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfSecuritiesWithUnrealizedUnrecognizedLossesDetails INVESTMENT SECURITIES (Schedule of Securities with Unrealized/Unrecognized Losses) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 42 false false R43.htm 99940501 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Loan Receivables) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfLoanReceivablesDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Loan Receivables) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 43 false false R44.htm 99940502 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in the Allowance for Loan Losses by Segment) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfActivityInAllowanceForLoanLossesBySegmentDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Activity in the Allowance for Loan Losses by Segment) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 44 false false R45.htm 99940503 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Unfunded loan commitment allowances activity) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesUnfundedLoanCommitmentAllowancesActivityDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Unfunded loan commitment allowances activity) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 45 false false R46.htm 99940504 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Non-accrual Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfNonAccrualLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Non-accrual Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 46 false false R47.htm 99940505 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Past Due Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesScheduleOfPastDueLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Past Due Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 47 false false R48.htm 99940506 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Credit Quality Indicator) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesCreditQualityIndicatorDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Credit Quality Indicator) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 48 false false R49.htm 99940507 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Collateral dependent loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesCollateralDependentLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Collateral dependent loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 49 false false R50.htm 99940508 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesAmortizedCostBasisOfLoansDetails LOANS AND ALLOWANCE FOR CREDIT LOSSES (Amortized Cost Basis of Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 50 false false R51.htm 99940509 - Disclosure - LOANS AND ALLOWANCE FOR CREDIT LOSSES (Types of Modifications) (Detail) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTypesOfModificationsDetail LOANS AND ALLOWANCE FOR CREDIT LOSSES (Types of Modifications) (Detail) Details http://www.metropolitanbankny.com/role/DisclosureLoansAndAllowanceForCreditLossesTables 51 false false R52.htm 99940601 - Disclosure - BORROWINGS (Federal Funds Purchased and FHLB Advances) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsFederalFundsPurchasedAndFhlbAdvancesDetails BORROWINGS (Federal Funds Purchased and FHLB Advances) (Details) Details http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables 52 false false R53.htm 99940701 - Disclosure - STOCKHOLDERS' EQUITY (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockholdersEquityDetails STOCKHOLDERS' EQUITY (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockholdersEquity 53 false false R54.htm 99940801 - Disclosure - EARNINGS PER SHARE (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerShareDetails EARNINGS PER SHARE (Details) Details http://www.metropolitanbankny.com/role/DisclosureEarningsPerShareTables 54 false false R55.htm 99940901 - Disclosure - STOCK COMPENSATION PLAN (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanDetails STOCK COMPENSATION PLAN (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 55 false false R56.htm 99940902 - Disclosure - STOCK COMPENSATION PLAN (Summary of Non-Vested Restricted Stock Awards) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanSummaryOfNonVestedRestrictedStockAwardsDetails STOCK COMPENSATION PLAN (Summary of Non-Vested Restricted Stock Awards) (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 56 false false R57.htm 99941001 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringAndNonRecurringBasisDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured at Fair Value on a Recurring and Non-Recurring Basis) (Details) Details http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsTables 57 false false R58.htm 99941002 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsCarryingAmountAndEstimatedFairValuesOfFinancialInstrumentsDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Carrying Amount and Estimated Fair Values of Financial Instruments) (Details) Details http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsTables 58 false false R59.htm 99941003 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS - Narratives (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsNarrativesDetails FAIR VALUE OF FINANCIAL INSTRUMENTS - Narratives (Details) Details 59 false false R60.htm 99941101 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tax effects allocated to each component of Other Comprehensive Income (Loss) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTaxEffectsAllocatedToEachComponentOfOtherComprehensiveIncomeLossDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tax effects allocated to each component of Other Comprehensive Income (Loss) (Details) Details http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables 60 false false R61.htm 99941102 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (After-tax changes in the balances of each component of Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossAfterTaxChangesInBalancesOfEachComponentOfAccumulatedOtherComprehensiveIncomeLossDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (After-tax changes in the balances of each component of Accumulated Other Comprehensive Income (Loss) (Details) Details http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables 61 false false R62.htm 99941103 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossReclassificationsOutOfAccumulatedOtherComprehensiveIncomeLossDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) Details http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables 62 false false R63.htm 99941201 - Disclosure - COMMITMENTS AND CONTINGENCIES (Outstanding following off-balance-sheet financial instruments) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesOutstandingFollowingOffBalanceSheetFinancialInstrumentsDetails COMMITMENTS AND CONTINGENCIES (Outstanding following off-balance-sheet financial instruments) (Details) Details http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables 63 false false R64.htm 99941202 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables 64 false false R65.htm 99941301 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of non-interest income) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomersScheduleOfNonInterestIncomeDetails REVENUE FROM CONTRACTS WITH CUSTOMERS (Schedule of non-interest income) (Details) Details http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomersTables 65 false false R66.htm 99941401 - Disclosure - DERIVATIVES - (Derivative position) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureDerivativesDerivativePositionDetails DERIVATIVES - (Derivative position) (Details) Details http://www.metropolitanbankny.com/role/DisclosureDerivativesTables 66 false false R67.htm 99941501 - Disclosure - SUBSEQUENT EVENTS (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureSubsequentEventsDetails SUBSEQUENT EVENTS (Details) Details http://www.metropolitanbankny.com/role/DisclosureSubsequentEvents 67 false false All Reports Book All Reports mcb-20260331.xsd mcb-20260331_cal.xml mcb-20260331_def.xml mcb-20260331_lab.xml mcb-20260331_pre.xml mcb-20260331x10q.htm http://fasb.org/srt/2025 http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 true true