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Commitments and Contingencies (Residential Whole Loan Purchase Commitments) (Details) $ in Millions	Mar. 31, 2021 USD ($)
Other Commitments [Line Items]
Unsettled residential whole loans	$ 112.2
Residential whole loans
Other Commitments [Line Items]
Unsettled residential whole loans	$ 112.2

X

- Definition

Unsettled Residential Whole Loans

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=mfa_ResidentialWholeLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: