XML 84 R66.htm IDEA: XBRL DOCUMENT
v3.20.4

LOANS - CRE Debt and Preferred Equity Investments - Based on Outstanding Principal (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Real Estate [Roll Forward] |  |
Principal payments | $ (809,045) |
Realized gain | (101,248) |
Allowance for loan losses |  |
Beginning allowance | (20,100) |
Ending allowance | (169,500) | $ (20,100)
Ending balance, carrying value | 498,081 |
Cumulative Effect, Period of Adoption, Adjustment |  |
Allowance for loan losses |  |
Beginning allowance | (37,400) |
Ending allowance |  | (37,400)
Commercial Mortgage |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 1,606,091 | 1,296,803
Originations & advances (principal) | 218,464 | 593,913
Principal payments | (221,730) | (316,663)
Principal write off | (7,000) |
Transfers | (109,599) | 40,058
Net (increase) decrease in origination fees | (1,788) | (4,384)
Realized gain | 204 |
Amortization of net origination fees | 5,018 | 5,571
Allowance for loan losses |  |
Beginning allowance | (12,703) |
Current period allowance | (133,152) | (9,207)
Write offs | 23,687 |
Ending allowance | (129,933) | (12,703)
Ending balance, carrying value | 1,372,430 | 1,606,091
Commercial Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 1,618,794 |
Allowance for loan losses |  |
Ending balance, carrying value |  | 1,618,794
Commercial Mortgage | Cumulative Effect, Period of Adoption, Adjustment |  |
Allowance for loan losses |  |
Beginning allowance | (7,765) |
Ending allowance |  | (7,765)
Commercial Mortgage | Senior Mortgages |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 499,690 | 981,202
Originations & advances (principal) | 206,090 | 572,204
Principal payments | (77,344) | (16,785)
Principal write off | 0 |
Transfers | (245,120) | (1,034,754)
Net (increase) decrease in origination fees | (1,055) | (4,200)
Realized gain | 204 |
Amortization of net origination fees | 2,371 | 2,023
Allowance for loan losses |  |
Beginning allowance | 0 |
Current period allowance | (8,648) | 0
Write offs | 0 |
Ending allowance | (10,911) | 0
Ending balance, carrying value | 373,925 | 499,690
Commercial Mortgage | Senior Mortgages | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 499,690 |
Allowance for loan losses |  |
Ending balance, carrying value |  | 499,690
Commercial Mortgage | Senior Mortgages | Cumulative Effect, Period of Adoption, Adjustment |  |
Allowance for loan losses |  |
Beginning allowance | (2,263) |
Ending allowance |  | (2,263)
Commercial Mortgage | Senior Securitized Mortgages |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 936,378 | 0
Originations & advances (principal) | 0 | 0
Principal payments | (144,308) | (150,245)
Principal write off | 0 |
Transfers | 142,621 | 1,083,487
Net (increase) decrease in origination fees | (653) | 0
Realized gain | 0 |
Amortization of net origination fees | 2,460 | 3,136
Allowance for loan losses |  |
Beginning allowance | 0 |
Current period allowance | (57,983) | 0
Write offs | 0 |
Ending allowance | (62,149) | 0
Ending balance, carrying value | 874,349 | 936,378
Commercial Mortgage | Senior Securitized Mortgages | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 936,378 |
Allowance for loan losses |  |
Ending balance, carrying value |  | 936,378
Commercial Mortgage | Senior Securitized Mortgages | Cumulative Effect, Period of Adoption, Adjustment |  |
Allowance for loan losses |  |
Beginning allowance | (4,166) |
Ending allowance |  | (4,166)
Mezzanine Loans | Commercial Mortgage |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 170,023 | 315,601
Originations & advances (principal) | 12,374 | 21,709
Principal payments | (78) | (149,633)
Principal write off | (7,000) |
Transfers | (7,100) | (8,675)
Net (increase) decrease in origination fees | (80) | (184)
Realized gain | 0 |
Amortization of net origination fees | 187 | 412
Allowance for loan losses |  |
Beginning allowance | (12,703) |
Current period allowance | (66,521) | (9,207)
Write offs | 23,687 |
Ending allowance | (56,873) | (12,703)
Ending balance, carrying value | 124,156 | 170,023
Mezzanine Loans | Commercial Mortgage | Cumulative Effect, Period of Adoption, Adjusted Balance |  |
Real Estate [Roll Forward] |  |
Beginning balance, carrying value | 182,726 |
Allowance for loan losses |  |
Ending balance, carrying value |  | 182,726
Mezzanine Loans | Commercial Mortgage | Cumulative Effect, Period of Adoption, Adjustment |  |
Allowance for loan losses |  |
Beginning allowance | $ (1,336) |
Ending allowance |  | $ (1,336)

X
- Definition (Increase) Decrease in Lease Origination Costs + References No definition available. + Details
Name: | nly_IncreaseDecreaseInLeaseOriginationCosts
Namespace Prefix: | nly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Loans on Real Estate, Gains (Losses) + References No definition available. + Details
Name: | nly_MortgageLoansonRealEstateGainsLosses
Namespace Prefix: | nly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Loans on Real Estate, Transfers + References No definition available. + Details
Name: | nly_MortgageLoansonRealEstateTransfers
Namespace Prefix: | nly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Real Estate [Roll Forward] + References No definition available. + Details
Name: | nly_RealEstateRollForward
Namespace Prefix: | nly_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Principal Writeoff + References No definition available. + Details
Name: | nly_SECSchedule1229RealEstateCompaniesInvestmentinMortgageLoansonRealEstatePrincipalWriteoff
Namespace Prefix: | nly_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 6 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
Name: | srt_MortgageLoansOnRealEstateCollectionsOfPrincipal
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121604886&loc=d3e8622-111531 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
Name: | us-gaap_AmortizationOfDeferredLoanOriginationFeesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column G)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of addition to investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstateOtherAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: | srt_CumulativeEffectPeriodOfAdoptionAxis=srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=nly_CommercialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=nly_SeniorMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SecuritiesFinancingTransactionAxis=nly_SeniorSecuritizedMortgagesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=nly_MezzanineLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |