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FAIR VALUE MEASUREMENT (Schedule of Assets Measured at Fair Value on Nonrecurring Basis and Quantitative Information about Level 3 Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Non-Recurring Fair Value Measurements    
OREO 2,772us-gaap_OtherRealEstateAndForeclosedAssets 3,069us-gaap_OtherRealEstateAndForeclosedAssets
Other Real Estate Owned- Fair Value [Member]    
Non-Recurring Fair Value Measurements    
Valuation technique
discounted appraisals
discounted appraisals
Significant Unobservable Inputs
collateral discounts
collateral discounts
General range of significant input values, minimum 6.00%mfbp_GeneralRangeOfSignificantInputValuesMinimum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_OtherRealEstateOwnedFairValueMember
6.00%mfbp_GeneralRangeOfSignificantInputValuesMinimum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_OtherRealEstateOwnedFairValueMember
General range of significant input values, maximum 20.00%mfbp_GeneralRangeOfSignificantInputValuesMaximum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_OtherRealEstateOwnedFairValueMember
20.00%mfbp_GeneralRangeOfSignificantInputValuesMaximum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_OtherRealEstateOwnedFairValueMember
Impaired Loans [Member]    
Non-Recurring Fair Value Measurements    
Valuation technique
discounted appraisals
discounted appraisals
Significant Unobservable Inputs
collateral discounts
collateral discounts
General range of significant input values, minimum 6.00%mfbp_GeneralRangeOfSignificantInputValuesMinimum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
6.00%mfbp_GeneralRangeOfSignificantInputValuesMinimum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
General range of significant input values, maximum 20.00%mfbp_GeneralRangeOfSignificantInputValuesMaximum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
20.00%mfbp_GeneralRangeOfSignificantInputValuesMaximum
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
Fair Value Measured on a Non-Recurring Basis [Member]    
Non-Recurring Fair Value Measurements    
OREO 2,772us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
3,069us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Commercial Real Estate 8,978mfbp_ImpairedLoansCommercialRealEstateFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
9,060mfbp_ImpairedLoansCommercialRealEstateFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Faith-based non-profit 16,264mfbp_ImpairedLoansFaithbasedNonprofitFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
17,119mfbp_ImpairedLoansFaithbasedNonprofitFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Residential real estate 3,843mfbp_ImpairedLoansResidentialRealEstateFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
4,214mfbp_ImpairedLoansResidentialRealEstateFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Consumer 2mfbp_ImpairedLoansConsumerFVDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Total Fair Value, non-recurring 31,859us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
33,462us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measured on a Non-Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Non-Recurring Fair Value Measurements    
OREO      
Impaired Loans - Commercial Real Estate      
Impaired Loans - Faith-based non-profit      
Impaired Loans - Residential real estate      
Impaired Loans - Consumer     
Total Fair Value, non-recurring      
Fair Value Measured on a Non-Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Non-Recurring Fair Value Measurements    
OREO      
Impaired Loans - Commercial Real Estate      
Impaired Loans - Faith-based non-profit      
Impaired Loans - Residential real estate      
Impaired Loans - Consumer     
Total Fair Value, non-recurring      
Fair Value Measured on a Non-Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Non-Recurring Fair Value Measurements    
OREO 2,772us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
3,069us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Commercial Real Estate 8,978mfbp_ImpairedLoansCommercialRealEstateFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
9,060mfbp_ImpairedLoansCommercialRealEstateFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Faith-based non-profit 16,264mfbp_ImpairedLoansFaithbasedNonprofitFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
17,119mfbp_ImpairedLoansFaithbasedNonprofitFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Residential real estate 3,843mfbp_ImpairedLoansResidentialRealEstateFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
4,214mfbp_ImpairedLoansResidentialRealEstateFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Impaired Loans - Consumer 2mfbp_ImpairedLoansConsumerFVDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Total Fair Value, non-recurring 31,859us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
33,462us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
Fair Value Measured on a Non-Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]    
Non-Recurring Fair Value Measurements    
Total Fair Value, non-recurring 29,087us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
30,393us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= mfbp_ImpairedLoansMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember