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INVESTMENT SECURITIES (Narrative) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
N
Dec. 31, 2014
N
INVESTMENT SECURITIES [Abstract]    
Gross realized gains (losses) $ 112,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains $ (83,000)us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Number of investment positions 54us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 59us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Statement [Line Items]    
Investment securities available for sale, at fair value 74,660,000us-gaap_AvailableForSaleSecurities 69,703,000us-gaap_AvailableForSaleSecurities
Pledged to Federal Reserve Bank [Member]    
Statement [Line Items]    
Funds pledged for public deposits 1,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_FederalReserveBankMember
1,000,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_FederalReserveBankMember
Pledged to Public Housing [Member]    
Statement [Line Items]    
Funds pledged for public deposits 3,900,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_PublicHousingMember
3,800,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_PublicHousingMember
Pledged to NC State Treasurer [Member]    
Statement [Line Items]    
Funds pledged for public deposits $ 17,400,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_NCStateTreasurerMember
$ 18,100,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalHomeLoanBank
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= mfbp_NCStateTreasurerMember