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Subsequent Events (Details) - Subsequent Event $ in Millions	1 Months Ended
	May 04, 2022 USD ($) securitization
Subsequent Event [Line Items]
Number of securitizations | securitization	2
Securitization of eligible investor loans	$ 509.5
Rehabilitation loans
Subsequent Event [Line Items]
Securitization of eligible investor loans	$ 250.0

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- Definition

Number Of Accounts Receivable Securitizations

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No definition available.

+ Details

Name:	mfa_NumberOfAccountsReceivableSecuritizations
Namespace Prefix:	mfa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- Definition

Purchased Performing Loans

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No definition available.

+ Details

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

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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:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=mfa_RehabilitationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: