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Fair Value of Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Fair Value Disclosures [Abstract]
Other real estate, fair value	$ 38.4	$ 59.2

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- Definition

Other Real Estate, Fair Value

+ References

No definition available.

+ Details

Name:	mfa_OtherRealEstateFairValue
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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