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Subsequent Events (Details) - Subsequent Event $ in Millions | 1 Months Ended
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Nov. 06, 2024 USD ($) loan_securitization
Legacy RPL/NPL loans |
Subsequent Event [Line Items] |
Financing receivable number of whole loans sold | loan_securitization | 2
UPB | $ 423.8
Transitional Loans |
Subsequent Event [Line Items] |
UPB | $ 214.7

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

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- Definition Financing Receivable, Unpaid Principal Balance + References No definition available. + Details
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Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 855 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483399/855-10-50-2 + Details
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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: |
Period Type: |

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

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- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_TransitionalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |