XML 107 R93.htm IDEA: XBRL DOCUMENT
v3.20.4

Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($)
Commitments And Contingencies [Abstract] |
Employment agreements expiration description | Employment agreements expire at various dates through 2025
Future minimum payments | $ 12,056,000

X
- Definition Commitments And Contingencies [Abstract] + References No definition available. + Details
Name: | mfin_CommitmentsAndContingenciesAbstract
Namespace Prefix: | mfin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment Agreement Description + References No definition available. + Details
Name: | mfin_EmploymentAgreementDescription
Namespace Prefix: | mfin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment agreements future minimum payments due. + References No definition available. + Details
Name: | mfin_EmploymentAgreementsFutureMinimumPaymentsDue
Namespace Prefix: | mfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant