XML 111 R100.htm IDEA: XBRL DOCUMENT
v3.20.2

Use of Special Purpose Entities and Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |  |  |
Residential whole loans, carrying value | [1] | $ 4,493,805 | $ 4,493,805 |  | $ 6,069,370
Residential whole loans, at fair value | [1] | 1,229,664 | 1,229,664 |  | 1,381,583
Residential whole loans, net |  | 4,387,559 | 4,387,559 |  | 6,066,345
Total residential whole loans |  | 5,600,000 | 5,600,000 |  | 7,400,000
Asset-backed Securities, Securitized Loans and Receivables |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from issuance of debt |  |  | 1,193,969 | $ 802,815 |
Residential whole loans, carrying value |  | 568,600 | 568,600 |  | 186,400
Residential whole loans, at fair value |  | 521,200 | 521,200 |  | 567,400
Securitized debt |  | 837,700 | 837,700 |  | 571,000
Asset-backed Securities, Securitized Loans and Receivables | Other Assets |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Real estate owned at fair value |  | 80,300 | 80,300 |  | $ 137,800
Senior Bonds |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |
Proceeds from issuance of debt |  | 372,800 | 399,800 |  |
Proceed from debt net of offering expenses and underwriting discount |  | $ 372,800 | $ 391,200 |  |
[1] | Includes approximately $568.6 million and $186.4 million of Residential whole loans, at carrying value and $521.2 million and $567.4 million of Residential whole loans, at fair value transferred to consolidated variable interest entities (“VIEs”) at September 30, 2020 and December 31, 2019, respectively. Such assets can be used only to settle the obligations of each respective VIE.

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, Carrying Value + References No definition available. + Details
Name: | mfa_ResidentialWholeLoansCarryingValue
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Residential Whole Loans, Net + References No definition available. + Details
Name: | mfa_ResidentialWholeLoansNet
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121585399&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
Name: | us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Namespace Prefix: | us-gaap_
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 http://asc.fasb.org/extlink&oid=121636179&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 http://asc.fasb.org/extlink&oid=121586364&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 http://asc.fasb.org/extlink&oid=121586364&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: |