XML 80 R70.htm IDEA: XBRL DOCUMENT v3.22.2

Financing Agreements - Financing Agreements, at Fair Values Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Financing Agreements [Line Items]
Financial instruments	$ 7,132,366	$ 6,378,782
Non Mark to Market Financing Facilities
Financing Agreements [Line Items]
Financial instruments	$ 10,800
Extension term (up to)	10 months
Minimum | Non Mark to Market Financing Facilities
Financing Agreements [Line Items]
Facility maturity period	2 months
Maximum | Non Mark to Market Financing Facilities
Financing Agreements [Line Items]
Facility maturity period	39 months
Financing Agreement
Financing Agreements [Line Items]
Cash pledged as collateral	$ 18,000	$ 10,200

X

- Definition

Debt Instrument, Term, Extension

+ References

No definition available.

+ Details

Name:	mfa_DebtInstrumentTermExtension
Namespace Prefix:	mfa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Financing Agreements, Fair Value And Carrying Value1

+ References

No definition available.

+ Details

Name:	mfa_FinancingAgreementsFairValueAndCarryingValue1
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

[Line Items] for Financing Agreements [Table]

+ References

No definition available.

+ Details

Name:	mfa_FinancingAgreementsLineItems
Namespace Prefix:	mfa_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of right to receive cash collateral under master netting arrangements that have not been offset against securities sold under agreement to repurchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 13
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 20
-URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226038-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (d)(2)
-URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

+ Details

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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