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LOANS (Details 9) (Bank, USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Activity in insider loans granted to the entity's executive officers and directors, including their families and firms      
Loans outstanding, beginning of period $ 8,789us-gaap_LoansAndLeasesReceivableRelatedParties $ 9,043us-gaap_LoansAndLeasesReceivableRelatedParties $ 9,043us-gaap_LoansAndLeasesReceivableRelatedParties
New loans     33us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Net activity on revolving lines of credit 117mfnc_LoansAndLeasesReceivableRelatedPartiesActivityOnRevolvingLinesOfCreditNet 760mfnc_LoansAndLeasesReceivableRelatedPartiesActivityOnRevolvingLinesOfCreditNet 1,390mfnc_LoansAndLeasesReceivableRelatedPartiesActivityOnRevolvingLinesOfCreditNet
Repayment (2,412)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (1,436)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections (1,677)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Loans outstanding, end of period 6,494us-gaap_LoansAndLeasesReceivableRelatedParties 8,367us-gaap_LoansAndLeasesReceivableRelatedParties 8,789us-gaap_LoansAndLeasesReceivableRelatedParties
Unfunded commitments 255mfnc_LoansAndLeasesReceivableRelatedPartiesUnfundedCommitments    
Substandard (6)
     
Activity in insider loans granted to the entity's executive officers and directors, including their families and firms      
Loans outstanding, end of period $ 0us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ dei_LegalEntityAxis
= mfnc_MBankMember
$ 0us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ dei_LegalEntityAxis
= mfnc_MBankMember
$ 0us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
/ dei_LegalEntityAxis
= mfnc_MBankMember