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Subsequent Events (Details) $ in Millions	1 Months Ended
	Nov. 03, 2022 USD ($)
Subsequent Event
Subsequent Event [Line Items]
Securitization of eligible investor loans	$ 234.8

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- Definition

Financing Receivable Securitization, Gross

+ References

No definition available.

+ Details

Name:	mfa_FinancingReceivableSecuritizationGross
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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.

+ Details

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

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- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: