XML 103 R83.htm IDEA: XBRL DOCUMENT v3.20.4

Commitments and Contingencies (Representations and Warranties in Connection with Loan Securitization Transactions) (Details)	Dec. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Allowance for repurchased loans	$ 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