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Summary of Significant Accounting Policies (Residential Whole Loans) (Details)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Number of days considered to classify loans delinquent	60 days
Weighted Average LTV Ratio	80.00%

X

- Definition

Represents the number of days considered to classify loans delinquent.

+ References

No definition available.

+ Details

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

X

- Definition

The LTV of which the Company has assessed its residential whole loans at carrying value will have a higher likelihood of default than newly originated mortgage loans

+ References

No definition available.

+ Details

Name:	mfa_RatioLoanToValue
Namespace Prefix:	mfa_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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