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Funds Borrowed - Schedule of Outstanding Balances of Funds Borrowed (Parenthetical) (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Deferred costs	$ 5,805,000	$ 5,105,000
Reserve Deposits	$ 250,000

X

- Definition

Reserve deposits.

+ References

No definition available.

+ Details

Name:	mfin_ReserveDeposits
Namespace Prefix:	mfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

The carrying amount of deferred costs.

+ References

No definition available.

+ Details

Name:	us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant