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Residential Loans - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 loans | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) loans | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gain (loss) on payoff and sale of mortgage loans |  |  |  |  |  |  |  |  |  | $ 18,100 | $ 2,900 | $ 4,200 |
Principal outstanding | $ 406,293 |  |  |  |  |  |  |  |  | 406,293 |  |  |
Payments to acquire other investments |  |  |  |  |  |  |  |  |  | 477 | 991 | 183 |
Unrealized (losses) gains, net | 1,861 | $ (1,067) | $ (934) | $ (147,918) | $ 86 | $ 6,102 | $ 4,448 | $ 22,006 |  | (148,058) | 32,642 | (7,775) |
Allowance for loan losses |  |  |  |  | 3,508 |  |  |  |  |  | $ 3,508 | $ 3,759 | $ 4,191
Allowance for loan losses, basis points |  |  |  |  |  |  |  |  |  |  | 74300.00% |  |
Distressed residential mortgage loans | Financial Asset Acquired with Credit Deterioration |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Distressed residential mortgage loans, net, held in securitization trusts |  |  |  |  | 158,700 |  |  |  |  |  | $ 158,700 |  |
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  | 10,200 |  |  |  |  |  | 10,200 |  |
Number of delinquent loans | loans |  |  |  |  |  |  |  |  | 18 |  |  |  |
Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization | Payment Deferral |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding |  |  |  |  | $ 6,700 |  |  |  |  |  | $ 6,700 |  |
Modified percent |  |  |  |  | 66.00% |  |  |  |  |  | 66.00% |  |
Consolidated SLST |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of other investments |  |  |  |  |  |  |  |  |  | 62,600 |  |  |
Unrealized (losses) gains, net |  |  |  |  |  |  |  |  |  | 2,400 |  |  |
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount | 212,100 |  |  |  | $ 276,800 |  |  |  |  | 212,100 | $ 276,800 |  |
Payments to acquire other investments |  |  |  |  |  |  |  |  |  | 40,000 |  |  |
Financial Asset, Equal to or Greater than 90 Days Past Due | Residential mortgage loans held in securitization trusts and real estate owned held in residential securitization |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of delinquent loans | loans |  |  |  |  |  |  |  |  |  |  | 16 |  |
Residential Mortgage Loans | Financial Asset, Equal to or Greater than 90 Days Past Due | VIE, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal outstanding | $ 236,700 |  |  |  | $ 50,700 |  |  |  |  | $ 236,700 | $ 50,700 |  |

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + 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)(1) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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