XML 92 R81.htm IDEA: XBRL DOCUMENT
v3.21.2

Commitments and Contingencies (Representations and Warranties in Connection with Loan Securitization Transactions) (Details) | Jun. 30, 2021 USD ($)
--- | ---
Commitments and Contingencies Disclosure [Abstract] |
Repurchase loans allowance | $ 0

X
- Definition Repurchase Loans, Allowance + References No definition available. + Details
Name: | mfa_RepurchaseLoansAllowance
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration