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Commitments and Contingencies - Residential Whole Loan Purchase Commitments (Details) $ in Millions | Mar. 31, 2022 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Estimated purchase price | $ 29.7
Unsettled residential whole loans | $ 28.9

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- Definition Residential Whole Loans, Estimated Purchase Price + References No definition available. + Details
Name: | mfa_ResidentialWholeLoansEstimatedPurchasePrice
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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

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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