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Subsequent Events (Details) - Subsequent Event $ in Millions	1 Months Ended
	Aug. 04, 2022 USD ($) securitization
Subsequent Event [Line Items]
Number of securitizations | securitization	2
Securitization of eligible investor loans	$ 550.2
Additional liquidity from securitization	$ 64.8

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- Definition

Financing Receivable Securitization, Gross

+ References

No definition available.

+ Details

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Namespace Prefix:	mfa_
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Balance Type:	debit
Period Type:	duration

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- Definition

Number Of Accounts Receivable Securitizations

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No definition available.

+ Details

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- Definition

The cash inflow from the securitization of receivables for loans to consumers. Securitization is the structured process whereby interests in loans and other receivables are packaged, underwritten, and sold in the form of asset-backed securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3179-108585

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Details

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