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Commitments and Contingencies (Rehabilitation Loan Commitments) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded commitment for rehabilitation loans	$ 60.6

X

- Definition

Unfunded Commitment

+ References

No definition available.

+ Details

Name:	mfa_UnfundedCommitment
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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