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Subsequent Events (Details) - Subsequent Event $ in Millions | 1 Months Ended
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Aug. 04, 2022 USD ($) securitization
Subsequent Event [Line Items] |
Number of securitizations | securitization | 2
Securitization of eligible investor loans | $ 550.2
Additional liquidity from securitization | $ 64.8

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- Definition Financing Receivable Securitization, Gross + References No definition available. + Details
Name: | mfa_FinancingReceivableSecuritizationGross
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number Of Accounts Receivable Securitizations + References No definition available. + Details
Name: | mfa_NumberOfAccountsReceivableSecuritizations
Namespace Prefix: | mfa_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash inflow from the securitization of receivables for loans to consumers. Securitization is the structured process whereby interests in loans and other receivables are packaged, underwritten, and sold in the form of asset-backed securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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