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LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of Composition of Loan Portfolio, Net of Deferred Fees and Costs, By Loan Classification) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees $ 172,697us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 175,088us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome    
Allowance for loan losses (3,446)us-gaap_LoansAndLeasesReceivableAllowance (3,440)us-gaap_LoansAndLeasesReceivableAllowance (3,486)us-gaap_LoansAndLeasesReceivableAllowance (3,493)us-gaap_LoansAndLeasesReceivableAllowance
Loans, net 169,251us-gaap_LoansAndLeasesReceivableNetReportedAmount 171,648us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Commercial [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 6,702us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
7,253us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Allowance for loan losses (271)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(353)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(178)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
(184)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Construction [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 7,487us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
2,557us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
   
Commercial Real Estate Owner Occupied [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 17,633us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_CommercialRealEstateOwnerOccupiedReceivableMember
18,013us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_CommercialRealEstateOwnerOccupiedReceivableMember
   
Commercial Real Estate Other [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 15,425us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
19,493us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
   
Faith Based Non-Profit Construction [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 1,932us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitConstructionMember
6,156us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitConstructionMember
   
Faith Based Non-Profit Owner Occupied [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 88,998us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitOwnerOccupiedMember
84,499us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitOwnerOccupiedMember
   
Faith Based Non-Profit Other [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 3,260us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitOtherMember
4,707us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_FaithBasedNonProfitOtherMember
   
Residential Real Estate First Mortgage [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 18,359us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
18,995us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
   
Residential Real Estate Multifamily [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 2,955us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_ResidentialMultifamilyMember
3,001us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_ResidentialMultifamilyMember
   
Residential Real Estate Home Equity [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 4,011us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
4,124us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
   
Residential Real Estate Construction [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 122us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_ResidentialConstructionMember
506us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= mfbp_ResidentialConstructionMember
   
Consumer [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 1,259us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
1,232us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
   
Allowance for loan losses (29)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
(28)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
(19)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
(19)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Other [Member]        
Loans and allowance for loan losses ("ALLL") [Line Items]        
Loans, net of unearned income and deferred fees 4,554us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember
4,552us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember
   
Allowance for loan losses $ (210)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember
$ (265)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember
$ (37)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember
$ (106)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_FinanceReceivablesMember