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Income Taxes - Narrative (Details) $ in Millions	Mar. 31, 2025 USD ($)
Income Tax Disclosure [Abstract]
Percentage of REIT taxable income that is the Company's objective to distribute within the permitted timeframe	100.00%
Federal net operating loss carryforward	$ 354.0

X

- Definition

Percentage of REIT taxable income that is the Company's objective to distribute within the permitted timeframe

+ References

No definition available.

+ Details

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Namespace Prefix:	mfa_
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Balance Type:	na
Period Type:	instant

X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration