XML 67 R47.htm IDEA: XBRL DOCUMENT
v3.20.4

Residential Whole Loans (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | $ 106,246 | $ 136,589 | $ 218,011 | $ 3,025 | $ 2,271 | $ 1,986 | $ 1,651 | $ 968 | $ 3,025
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 70,555 |  |  |  |  | 70,600
Current provision/(reversal) | (18,583) | (30,062) | (10,614) | 74,897 | 1,031 | 347 | 385 | 683 |
Write-offs | (830) | (281) | (627) | (647) | (277) | (62) | (50) | 0 | (2,385)
Valuation adjustment on loans held for sale |  |  | (70,181) | 70,181 |  |  |  |  |
Ending balance | 86,833 | 106,246 | 136,589 | 218,011 | 3,025 | 2,271 | 1,986 | 1,651 | 86,833
Residential whole loans, at carrying value | 4,195,332 |  |  |  |  |  |  |  | 4,195,332
Gross up of the amortized cost basis of Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  | 62,400
Non-QM Loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 26,753 | 31,353 | 103,831 | 388 | 0 | 0 | 0 | 0 | 388
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 6,904 |  |  |  |  |
Current provision/(reversal) | (5,599) | (4,568) | (2,297) | 26,358 | 388 | 0 | 0 | 0 |
Write-offs | (86) | (32) | 0 | 0 | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale |  |  | (70,181) | 70,181 |  |  |  |  |
Ending balance | 21,068 | 26,753 | 31,353 | 103,831 | 388 | 0 | 0 | 0 | 21,068
Rehabilitation loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 22,633 | 30,000 | 35,633 | 2,331 | 388 | 450 | 500 | 0 | 2,331
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 517 |  |  |  |  |
Current provision/(reversal) | (3,837) | (7,140) | (5,213) | 33,213 | 2,220 | 0 | 0 | 500 |
Write-offs | (425) | (227) | (420) | (428) | (277) | (62) | (50) | 0 |
Valuation adjustment on loans held for sale |  |  | 0 | 0 |  |  |  |  |
Ending balance | 18,371 | 22,633 | 30,000 | 35,633 | 2,331 | 388 | 450 | 500 | 18,371
Residential whole loans, at carrying value | 161,800 |  |  |  |  |  |  |  | 161,800
Single-family rental loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 5,025 | 6,931 | 7,431 | 62 | 0 | 0 | 0 | 0 | 62
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 754 |  |  |  |  |
Current provision/(reversal) | (1,107) | (1,906) | (500) | 6,615 | 62 | 0 | 0 | 0 |
Write-offs | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale |  |  | 0 | 0 |  |  |  |  |
Ending balance | 3,918 | 5,025 | 6,931 | 7,431 | 62 | 0 | 0 | 0 | 3,918
Seasoned performing loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 150 | 224 | 249 | 0 | 0 | 0 | 0 | 0 | 0
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 19 |  |  |  |  |
Current provision/(reversal) | (43) | (74) | (25) | 230 | 0 | 0 | 0 | 0 |
Write-offs | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale |  |  | 0 | 0 |  |  |  |  |
Ending balance | 107 | 150 | 224 | 249 | 0 | 0 | 0 | 0 | 107
Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | 51,685 | 68,081 | 70,867 | 244 | 1,883 | 1,536 | 1,151 | 968 | 244
Transition adjustment on adoption of ASU 2016-13 |  |  |  | 62,361 |  |  |  |  |
Current provision/(reversal) | (7,997) | (16,374) | (2,579) | 8,481 | (1,639) | 347 | 385 | 183 |
Write-offs | (319) | (22) | (207) | (219) | 0 | 0 | 0 | 0 |
Valuation adjustment on loans held for sale |  |  | 0 | 0 |  |  |  |  |
Ending balance | 43,369 | $ 51,685 | $ 68,081 | $ 70,867 | $ 244 | $ 1,883 | $ 1,536 | $ 1,151 | 43,369
Residential whole loans, at carrying value | 70,300 |  |  |  |  |  |  |  | 70,300
Unfunded Loan Commitment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Ending balance | 1,200 |  |  |  |  |  |  |  | 1,200
Commitment to lend, unfunded | 60,600 |  |  |  |  |  |  |  | 60,600
Non-QM Loans |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  | (117)
Residential whole loans, at carrying value | 2,357,185 |  |  |  |  |  |  |  | 2,357,185
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |  |  |
Ending balance | $ 8,300 |  |  |  |  |  |  |  | $ 8,300

X
- Definition Financing Receivable, Allowance for Credit Loss, Adoption of New Accounting Principle + References No definition available. + Details
Name: | mfa_FinancingReceivableAllowanceforCreditLossAdoptionofNewAccountingPrinciple
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Gross Up of Amortized Cost of Purchased Credit Deteriorated Loans + References No definition available. + Details
Name: | mfa_FinancingReceivableGrossUpofAmortizedCostofPurchasedCreditDeterioratedLoans
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Valuation Allowance Adjustment + References No definition available. + Details
Name: | mfa_FinancingReceivableValuationAllowanceAdjustment
Namespace Prefix: | mfa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
Name: | us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allowance for credit loss, of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_NonQMLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_RehabilitationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_SingleFamilyRentalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_SeasonedPerformingLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mfa_PurchasedCreditDeterioratedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=mfa_NonQMLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |