XML 113 R100.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized (loss)/gain on sales of securities and residential whole loans |  | $ 0 | $ (188,847) | $ 62,002
Other, net |  | 30,040 | (34,762) | 11,583
Net Income/(Loss) Available to Common Stock and Participating Securities |  | 295,995 | (709,186) | 363,117
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 | (660,594) | (47,234)
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 securities and residential whole loans |  | 0 | (389,127) | (44,600)
Other, net |  | 0 | (344,269) | (180)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | 0 | (733,396) | (44,780)
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 | $ 72,802 | 0 |  | (2,454)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | $ 0 | $ 72,802 | $ (2,454)

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: |