XML 56 R46.htm IDEA: XBRL DOCUMENT v3.23.3

Summary of Significant Accounting Policies - Contingencies (Details)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Commitment, Period	10 years

X

- Definition

Commitment, Period

+ References

No definition available.

+ Details

Name:	mfa_CommitmentPeriod
Namespace Prefix:	mfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration