XML 100 R87.htm IDEA: XBRL DOCUMENT v3.21.1

Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized (loss)/gain on sales of residential mortgage securities and residential whole loans	$ 0	$ (238,380)
Other, net	3,607	(2,011)
Net Income/(Loss) Available to Common Stock and Participating Securities	77,303	(914,210)
Amounts Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income/(Loss) Available to Common Stock and Participating Securities	0	(366,628)
Amounts Reclassified from AOCI | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net realized (loss)/gain on sales of residential mortgage securities and residential whole loans	0	(23,953)
Other, net	0	(344,269)
Net Income/(Loss) Available to Common Stock and Participating Securities	$ 0	(368,222)
Amounts Reclassified from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net		1,594
Net Income/(Loss) Available to Common Stock and Participating Securities		$ 1,594

X

- Definition

Debt Securities and Loans, Realized Gain (Loss), Excluding Other-than-temporary Impairment

+ References

No definition available.

+ Details

Name:	mfa_DebtSecuritiesandLoansRealizedGainLossExcludingOtherthantemporaryImpairment
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Net Income (Loss) Available to Common Stockholders, Basic and Participating Securities

+ References

No definition available.

+ Details

Name:	mfa_NetIncomeLossAvailabletoCommonStockholdersBasicandParticipatingSecurities
Namespace Prefix:	mfa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis=us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetInvestmentGainLossIncludingPortionAttributableToNoncontrollingInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: