3.20.1 html 283 588 1 true 83 0 false 6 false false R1.htm 00090 - Document - Document and Entity Information Sheet http://www.metropolitanbankny.com/role/DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 00100 - Statement - CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfFinancialCondition CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION Statements 2 false false R3.htm 00105 - 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 00200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfOperations CONSOLIDATED STATEMENTS OF OPERATIONS Statements 4 false false R5.htm 00300 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementsOfComprehensiveIncome CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Statements 5 false false R6.htm 00400 - 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 00500 - Statement - CONSOLIDATED STATEMENT OF CASH FLOWS Sheet http://www.metropolitanbankny.com/role/StatementConsolidatedStatementOfCashFlows CONSOLIDATED STATEMENT OF CASH FLOWS Statements 7 false false R8.htm 10101 - Disclosure - ORGANIZATION Sheet http://www.metropolitanbankny.com/role/DisclosureOrganization ORGANIZATION Notes 8 false false R9.htm 10201 - Disclosure - BASIS OF PRESENTATION Sheet http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentation BASIS OF PRESENTATION Notes 9 false false R10.htm 10301 - Disclosure - SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS Sheet http://www.metropolitanbankny.com/role/DisclosureSummaryOfRecentAccountingPronouncements SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS Notes 10 false false R11.htm 10401 - Disclosure - INVESTMENT SECURITIES Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecurities INVESTMENT SECURITIES Notes 11 false false R12.htm 10501 - Disclosure - LOANS Sheet http://www.metropolitanbankny.com/role/DisclosureLoans LOANS Notes 12 false false R13.htm 10601 - Disclosure - PREMISES AND EQUIPMENT Sheet http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipment PREMISES AND EQUIPMENT Notes 13 false false R14.htm 10701 - Disclosure - DEPOSITS Sheet http://www.metropolitanbankny.com/role/DisclosureDeposits DEPOSITS Notes 14 false false R15.htm 10801 - Disclosure - BORROWINGS Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowings BORROWINGS Notes 15 false false R16.htm 10901 - Disclosure - INCOME TAXES Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxes INCOME TAXES Notes 16 false false R17.htm 11001 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.metropolitanbankny.com/role/DisclosureRelatedPartyTransactions RELATED PARTY TRANSACTIONS Notes 17 false false R18.htm 11101 - Disclosure - COMMITMENTS AND CONTINGENCIES Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingencies COMMITMENTS AND CONTINGENCIES Notes 18 false false R19.htm 11201 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstruments FAIR VALUE OF FINANCIAL INSTRUMENTS Notes 19 false false R20.htm 11301 - Disclosure - STOCKHOLDERS' EQUITY Sheet http://www.metropolitanbankny.com/role/DisclosureStockholdersEquity STOCKHOLDERS' EQUITY Notes 20 false false R21.htm 11401 - Disclosure - STOCK COMPENSATION PLAN Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlan STOCK COMPENSATION PLAN Notes 21 false false R22.htm 11501 - Disclosure - EMPLOYEE BENEFIT PLAN Sheet http://www.metropolitanbankny.com/role/DisclosureEmployeeBenefitPlan EMPLOYEE BENEFIT PLAN Notes 22 false false R23.htm 11601 - Disclosure - FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK Sheet http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRisk FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK Notes 23 false false R24.htm 11701 - Disclosure - REGULATORY CAPITAL Sheet http://www.metropolitanbankny.com/role/DisclosureRegulatoryCapital REGULATORY CAPITAL Notes 24 false false R25.htm 11801 - Disclosure - EARNINGS PER COMMON SHARE Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShare EARNINGS PER COMMON SHARE Notes 25 false false R26.htm 11901 - Disclosure - PARENT COMPANY FINANCIAL INFORMATION Sheet http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformation PARENT COMPANY FINANCIAL INFORMATION Notes 26 false false R27.htm 12001 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLoss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Notes 27 false false R28.htm 12101 - Disclosure - UNAUDITED QUARTERLY FINANCIAL DATA Sheet http://www.metropolitanbankny.com/role/DisclosureUnauditedQuarterlyFinancialData UNAUDITED QUARTERLY FINANCIAL DATA Notes 28 false false R29.htm 12201 - Disclosure - REVENUE FROM CONTRACTS WITH CUSTOMERS Sheet http://www.metropolitanbankny.com/role/DisclosureRevenueFromContractsWithCustomers REVENUE FROM CONTRACTS WITH CUSTOMERS Notes 29 false false R30.htm 20202 - Disclosure - SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS (Policies) Sheet http://www.metropolitanbankny.com/role/DisclosureSummaryOfRecentAccountingPronouncementsPolicies SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS (Policies) Policies 30 false false R31.htm 30403 - Disclosure - INVESTMENT SECURITIES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables INVESTMENT SECURITIES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureInvestmentSecurities 31 false false R32.htm 30503 - Disclosure - LOANS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansTables LOANS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureLoans 32 false false R33.htm 30603 - Disclosure - PREMISES AND EQUIPMENT (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentTables PREMISES AND EQUIPMENT (Tables) Tables http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipment 33 false false R34.htm 30703 - Disclosure - DEPOSITS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureDepositsTables DEPOSITS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureDeposits 34 false false R35.htm 30803 - Disclosure - BORROWINGS (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables BORROWINGS (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureBorrowings 35 false false R36.htm 30903 - Disclosure - INCOME TAXES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesTables INCOME TAXES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureIncomeTaxes 36 false false R37.htm 31103 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables COMMITMENTS AND CONTINGENCIES (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingencies 37 false false R38.htm 31203 - 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 38 false false R39.htm 31403 - Disclosure - STOCK COMPENSATION PLAN (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables STOCK COMPENSATION PLAN (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlan 39 false false R40.htm 31603 - Disclosure - FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRisk 40 false false R41.htm 31703 - Disclosure - REGULATORY CAPITAL (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureRegulatoryCapitalTables REGULATORY CAPITAL (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureRegulatoryCapital 41 false false R42.htm 31803 - Disclosure - EARNINGS PER COMMON SHARE (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShareTables EARNINGS PER COMMON SHARE (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShare 42 false false R43.htm 31903 - Disclosure - PARENT COMPANY FINANCIAL INFORMATION (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationTables PARENT COMPANY FINANCIAL INFORMATION (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformation 43 false false R44.htm 32003 - 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 44 false false R45.htm 32103 - Disclosure - UNAUDITED QUARTERLY FINANCIAL DATA (Tables) Sheet http://www.metropolitanbankny.com/role/DisclosureUnauditedQuarterlyFinancialDataTables UNAUDITED QUARTERLY FINANCIAL DATA (Tables) Tables http://www.metropolitanbankny.com/role/DisclosureUnauditedQuarterlyFinancialData 45 false false R46.htm 32201 - 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 46 false false R47.htm 40201 - Disclosure - BASIS OF PRESENTATION (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentationDetails BASIS OF PRESENTATION (Details) Details http://www.metropolitanbankny.com/role/DisclosureBasisOfPresentation 47 false false R48.htm 40301 - Disclosure - SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureSummaryOfRecentAccountingPronouncementsDetails SUMMARY OF RECENT ACCOUNTING PRONOUNCEMENTS (Details) Details http://www.metropolitanbankny.com/role/DisclosureSummaryOfRecentAccountingPronouncementsPolicies 48 false false R49.htm 40401 - 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 49 false false R50.htm 40402 - 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 50 false false R51.htm 40403 - 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 51 false false R52.htm 40404 - Disclosure - INVESTMENT SECURITIES (Proceeds from sales and calls of securities and associated gains and losses) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesProceedsFromSalesAndCallsOfSecuritiesAndAssociatedGainsAndLossesDetails INVESTMENT SECURITIES (Proceeds from sales and calls of securities and associated gains and losses) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 52 false false R53.htm 40405 - 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 53 false false R54.htm 40406 - Disclosure - INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesScheduleOfSecuritiesWithUnrealizedLossesDetails INVESTMENT SECURITIES (Schedule of Securities with Unrealized Losses) (Details) Details http://www.metropolitanbankny.com/role/DisclosureInvestmentSecuritiesTables 54 false false R55.htm 40501 - Disclosure - LOANS (Schedule of Loan Receivables) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfLoanReceivablesDetails LOANS (Schedule of Loan Receivables) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 55 false false R56.htm 40502 - Disclosure - LOANS (Schedule of Activity in the Allowance for Loan Losses by Segment) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfActivityInAllowanceForLoanLossesBySegmentDetails LOANS (Schedule of Activity in the Allowance for Loan Losses by Segment) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 56 false false R57.htm 40503 - Disclosure - LOANS (Schedule of Loans by Impairment Method) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfLoansByImpairmentMethodDetails LOANS (Schedule of Loans by Impairment Method) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 57 false false R58.htm 40504 - Disclosure - LOANS (Schedule of Impaired by Class of Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfImpairedByClassOfLoansDetails LOANS (Schedule of Impaired by Class of Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 58 false false R59.htm 40505 - Disclosure - LOANS (Schedule of Non-accrual Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfNonAccrualLoansDetails LOANS (Schedule of Non-accrual Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 59 false false R60.htm 40506 - Disclosure - LOANS (Schedule of Past Due Loans) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfPastDueLoansDetails LOANS (Schedule of Past Due Loans) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 60 false false R61.htm 40507 - Disclosure - LOANS (Schedule of Loans by Risk Category) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansScheduleOfLoansByRiskCategoryDetails LOANS (Schedule of Loans by Risk Category) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 61 false false R62.htm 40508 - Disclosure - LOANS (Troubled Debt Restructurings) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureLoansTroubledDebtRestructuringsDetails LOANS (Troubled Debt Restructurings) (Details) Details http://www.metropolitanbankny.com/role/DisclosureLoansTables 62 false false R63.htm 40601 - Disclosure - PREMISES AND EQUIPMENT (Schedule of Premises and equipment) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentScheduleOfPremisesAndEquipmentDetails PREMISES AND EQUIPMENT (Schedule of Premises and equipment) (Details) Details http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentTables 63 false false R64.htm 40602 - Disclosure - PREMISES AND EQUIPMENT (Schedule of Premises and equipment) (Useful life) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentScheduleOfPremisesAndEquipmentUsefulLifeDetails PREMISES AND EQUIPMENT (Schedule of Premises and equipment) (Useful life) (Details) Details http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentTables 64 false false R65.htm 40603 - Disclosure - PREMISES AND EQUIPMENT (Details) Sheet http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentDetails PREMISES AND EQUIPMENT (Details) Details http://www.metropolitanbankny.com/role/DisclosurePremisesAndEquipmentTables 65 false false R66.htm 40701 - Disclosure - DEPOSITS (Schedule of Deposits) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureDepositsScheduleOfDepositsDetails DEPOSITS (Schedule of Deposits) (Details) Details http://www.metropolitanbankny.com/role/DisclosureDepositsTables 66 false false R67.htm 40702 - Disclosure - DEPOSITS (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureDepositsDetails DEPOSITS (Details) Details http://www.metropolitanbankny.com/role/DisclosureDepositsTables 67 false false R68.htm 40703 - Disclosure - DEPOSITS (schedule maturities of time deposits) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureDepositsScheduleMaturitiesOfTimeDepositsDetails DEPOSITS (schedule maturities of time deposits) (Details) Details http://www.metropolitanbankny.com/role/DisclosureDepositsTables 68 false false R69.htm 40801 - Disclosure - BORROWINGS (Advances from the FHLB) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsAdvancesFromFhlbDetails BORROWINGS (Advances from the FHLB) (Details) Details http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables 69 false false R70.htm 40802 - Disclosure - BORROWINGS (Advances from the FHLB) - Fixed rate (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsAdvancesFromFhlbFixedRateDetails BORROWINGS (Advances from the FHLB) - Fixed rate (Details) Details http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables 70 false false R71.htm 40803 - Disclosure - BORROWINGS (Schedule of FHLB advances mature over the next five years and thereafter) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsScheduleOfFhlbAdvancesMatureOverNextFiveYearsAndThereafterDetails BORROWINGS (Schedule of FHLB advances mature over the next five years and thereafter) (Details) Details http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables 71 false false R72.htm 40804 - Disclosure - BORROWINGS (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureBorrowingsDetails BORROWINGS (Details) Details http://www.metropolitanbankny.com/role/DisclosureBorrowingsTables 72 false false R73.htm 40901 - Disclosure - INCOME TAXES (Schedule of Income tax expense) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesScheduleOfIncomeTaxExpenseDetails INCOME TAXES (Schedule of Income tax expense) (Details) Details http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesTables 73 false false R74.htm 40902 - Disclosure - INCOME TAXES (Schedule of Deferred tax assets and liabilities) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesScheduleOfDeferredTaxAssetsAndLiabilitiesDetails INCOME TAXES (Schedule of Deferred tax assets and liabilities) (Details) Details http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesTables 74 false false R75.htm 40903 - Disclosure - INCOME TAXES (Reconciliation of statutory federal income tax rate) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesReconciliationOfStatutoryFederalIncomeTaxRateDetails INCOME TAXES (Reconciliation of statutory federal income tax rate) (Details) Details http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesTables 75 false false R76.htm 40904 - Disclosure - INCOME TAXES (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesDetails INCOME TAXES (Details) Details http://www.metropolitanbankny.com/role/DisclosureIncomeTaxesTables 76 false false R77.htm 41001 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureRelatedPartyTransactionsDetails RELATED PARTY TRANSACTIONS (Details) Details http://www.metropolitanbankny.com/role/DisclosureRelatedPartyTransactions 77 false false R78.htm 41101 - Disclosure - COMMITMENTS AND CONTINGENCIES (Future minimum rental payments required) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesFutureMinimumRentalPaymentsRequiredDetails COMMITMENTS AND CONTINGENCIES (Future minimum rental payments required) (Details) Details http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables 78 false false R79.htm 41102 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesDetails COMMITMENTS AND CONTINGENCIES (Details) Details http://www.metropolitanbankny.com/role/DisclosureCommitmentsAndContingenciesTables 79 false false R80.htm 41201 - Disclosure - FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) Details http://www.metropolitanbankny.com/role/DisclosureFairValueOfFinancialInstrumentsTables 80 false false R81.htm 41202 - 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 81 false false R82.htm 41301 - Disclosure - STOCKHOLDERS' EQUITY (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockholdersEquityDetails STOCKHOLDERS' EQUITY (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockholdersEquity 82 false false R83.htm 41401 - Disclosure - STOCK COMPENSATION PLAN (Summary of the Status of the Stock Option Plan) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanSummaryOfStatusOfStockOptionPlanDetails STOCK COMPENSATION PLAN (Summary of the Status of the Stock Option Plan) (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 83 false false R84.htm 41402 - Disclosure - STOCK COMPENSATION PLAN (Summary of Stock Options Outstanding) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanSummaryOfStockOptionsOutstandingDetails STOCK COMPENSATION PLAN (Summary of Stock Options Outstanding) (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 84 false false R85.htm 41403 - 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 85 false false R86.htm 41404 - Disclosure - STOCK COMPENSATION PLAN (Summary of Performance Based Stock Awards) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanSummaryOfPerformanceBasedStockAwardsDetails STOCK COMPENSATION PLAN (Summary of Performance Based Stock Awards) (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 86 false false R87.htm 41405 - Disclosure - STOCK COMPENSATION PLAN (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanDetails STOCK COMPENSATION PLAN (Details) Details http://www.metropolitanbankny.com/role/DisclosureStockCompensationPlanTables 87 false false R88.htm 41501 - Disclosure - EMPLOYEE BENEFIT PLAN (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureEmployeeBenefitPlanDetails EMPLOYEE BENEFIT PLAN (Details) Details http://www.metropolitanbankny.com/role/DisclosureEmployeeBenefitPlan 88 false false R89.htm 41601 - Disclosure - FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Outstanding following off-balance-sheet financial instruments) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskOutstandingFollowingOffBalanceSheetFinancialInstrumentsDetails FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Outstanding following off-balance-sheet financial instruments) (Details) Details http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables 89 false false R90.htm 41602 - Disclosure - FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskDetails FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details) Details http://www.metropolitanbankny.com/role/DisclosureFinancialInstrumentsWithOffBalanceSheetRiskTables 90 false false R91.htm 41701 - Disclosure - REGULATORY CAPITAL (Summary of actual capital amounts and ratios) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureRegulatoryCapitalSummaryOfActualCapitalAmountsAndRatiosDetails REGULATORY CAPITAL (Summary of actual capital amounts and ratios) (Details) Details http://www.metropolitanbankny.com/role/DisclosureRegulatoryCapitalTables 91 false false R92.htm 41801 - Disclosure - EARNINGS PER COMMON SHARE (Computation of Basic and Diluted Earnings per Share) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShareComputationOfBasicAndDilutedEarningsPerShareDetails EARNINGS PER COMMON SHARE (Computation of Basic and Diluted Earnings per Share) (Details) Details http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShareTables 92 false false R93.htm 41802 - Disclosure - EARNINGS PER COMMON SHARE (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShareDetails EARNINGS PER COMMON SHARE (Details) Details http://www.metropolitanbankny.com/role/DisclosureEarningsPerCommonShareTables 93 false false R94.htm 41901 - Disclosure - PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationCondensedBalanceSheetsDetails PARENT COMPANY FINANCIAL INFORMATION (Condensed Balance Sheets) (Details) Details http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationTables 94 false false R95.htm 41902 - Disclosure - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Income) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationCondensedStatementsOfIncomeDetails PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Income) (Details) Details http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationTables 95 false false R96.htm 41903 - Disclosure - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statement of Cash Flows) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationCondensedStatementOfCashFlowsDetails PARENT COMPANY FINANCIAL INFORMATION (Condensed Statement of Cash Flows) (Details) Details http://www.metropolitanbankny.com/role/DisclosureParentCompanyFinancialInformationTables 96 false false R97.htm 42001 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Schedule of Accumulated Other Comprehensive Loss) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossScheduleOfAccumulatedOtherComprehensiveLossDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Schedule of Accumulated Other Comprehensive Loss) (Details) Details http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables 97 false false R98.htm 42002 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Proceeds from sales and calls of securities and associated gains and losses (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossProceedsFromSalesAndCallsOfSecuritiesAndAssociatedGainsAndLossesDetails ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Proceeds from sales and calls of securities and associated gains and losses (Details) Details http://www.metropolitanbankny.com/role/DisclosureAccumulatedOtherComprehensiveIncomeLossTables 98 false false R99.htm 42003 - 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 99 false false R100.htm 42101 - Disclosure - UNAUDITED QUARTERLY FINANCIAL DATA (Selected Consolidated Quarterly Financial Data) (Details) Sheet http://www.metropolitanbankny.com/role/DisclosureUnauditedQuarterlyFinancialDataSelectedConsolidatedQuarterlyFinancialDataDetails UNAUDITED QUARTERLY FINANCIAL DATA (Selected Consolidated Quarterly Financial Data) (Details) Details http://www.metropolitanbankny.com/role/DisclosureUnauditedQuarterlyFinancialDataTables 100 false false R101.htm 42201 - 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 101 false false All Reports Book All Reports mcb-20191231.xml mcb-20191231.xsd mcb-20191231_cal.xml mcb-20191231_def.xml mcb-20191231_lab.xml mcb-20191231_pre.xml http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 http://fasb.org/us-gaap/2019-01-31 true true