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LOANS AND ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
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Dec. 31, 2014
Mar. 31, 2014
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Loans and allowance for loan losses ("ALLL") [Line Items]          
Net charge-offs/(recoveries) $ (6)us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet $ 7us-gaap_AllowanceForLoanAndLeaseLossesWriteoffsNet      
Net Charge-offs/(recoveries), percentage (0.01%)mfbp_AllowanceForLoanAndLeaseLossesWriteOffsNetPercentage 0.02%mfbp_AllowanceForLoanAndLeaseLossesWriteOffsNetPercentage   0.06%mfbp_AllowanceForLoanAndLeaseLossesWriteOffsNetPercentage  
Concentration risk - percentage of financing receivables in faith-based non-profit organizations 54.54%us-gaap_ConcentrationRiskPercentage1        
Concentration risk - percentage of reserve allocated to faith-based non-profit organizations 41.79%mfbp_ConcentrationRiskPercentageAllowanceForLoanLosses        
Reserve for unfunded commitments 38mfbp_ReserveForUnfundedCommitments   38mfbp_ReserveForUnfundedCommitments 34mfbp_ReserveForUnfundedCommitments  
Change in loans       375us-gaap_IncreaseDecreaseInFinanceReceivables  
Number of loans on nonaccrual status   1mfbp_FinancingReceivableRecordedInvestmentNonaccrualStatusNumberOfContracts     1mfbp_FinancingReceivableRecordedInvestmentNonaccrualStatusNumberOfContracts
Non-accrual Loans 7,260us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 2,600us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 7,260us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 5,920us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 2,600us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Number of loans, TDRs 2mfbp_FinancingReceivableModificationsNumberOfContracts1BelowMarket    2mfbp_FinancingReceivableModificationsNumberOfContracts1BelowMarket    
Pre-modification Outstanding Recorded Investment $ 129mfbp_FinancingReceivableModificationsPreModificationRecordedInvestment1BelowMarketInterestRate   $ 129mfbp_FinancingReceivableModificationsPreModificationRecordedInvestment1BelowMarketInterestRate   $ 3,100mfbp_FinancingReceivableModificationsPreModificationRecordedInvestment1BelowMarketInterestRate