LOANS - TROUBLED DEBT RESTRUCTURING (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) item loan	Sep. 30, 2019 loan
LOANS
Number of consecutive timely payments before being considered return to accruing status \| item	6
Number of TDR's \| loan	4	4
Restructured loan pre-modification	$ 568
Restructured loans post-modification	$ 540

Number of consecutive timely payments before the Company would consider a return of a restructured loan to accruing status in accordance with FDIC guidelines regarding restoration of credits to accrual status.

No definition available.

+ Details

Name:	mfnc_NumberOfConsecutiveTimelyPaymentsBeforeBeingConsideredReturnToAccruingStatus
Namespace Prefix:	mfnc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration