XML 110 R100.htm IDEA: XBRL DOCUMENT v3.23.1

Use of Special Purpose Entities and Variable Interest Entities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total residential whole loans	$ 7,800,000	$ 7,500,000
Asset-backed Securities, Securitized Loans and Receivables
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	5,807,409	5,286,305
Residential whole loans	4,600,000	4,000,000
Securitized debt	3,800,000	3,400,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets
Variable Interest Entity [Line Items]
Real estate owned at fair value	34,200	$ 36,500
Senior Bonds
Variable Interest Entity [Line Items]
Proceeds from issuance of debt	523,200
Proceed from debt net of offering expenses and underwriting discount	$ 521,100

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Real Estate Owned At Fair Value

+ References

No definition available.

+ Details

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

X

- Definition

Residential Whole Loans, At Fair Value And Carrying Value

+ References

No definition available.

+ Details

Name:	mfa_ResidentialWholeLoansAtFairValueAndCarryingValue
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

+ Details

Name:	us-gaap_OtherSecuredFinancings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

+ Details

Name:	us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

X

- Details

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

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: