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Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total residential whole loans	$ 8,200,000	$ 8,200,000	$ 7,900,000
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt		5,040,474	3,682,082
Residential whole loans	3,900,000	3,900,000	3,000,000
Securitized debt	3,400,000	3,400,000	2,700,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value	33,500	$ 33,500	$ 35,400
Senior Bonds
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	860,900
Proceed from debt net of offering expenses and underwriting discount	$ 847,100

X

- Definition

Loans, Including Fair Value Loans, Credit Impaired Loans And Other Loans At Carrying Value

+ References

No definition available.

+ Details

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X

- Definition

Real Estate Owned At Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	mfa_
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Balance Type:	debit
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X

- Definition

Residential Whole Loans, At Fair Value And Carrying Value

+ References

No definition available.

+ Details

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

X

- Definition

Secured financing other than securities sold under agreements to repurchase and securities loaned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 15
-Paragraph 83
-URI https://asc.fasb.org/extlink&oid=126929950&loc=d3e34841-113949

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X

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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Period Type:	duration

X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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