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Residential Loans, at Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains, net | $ 41,063 |  | $ 28,014 |
Residential loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains, net | 25,583 | $ 16,818 | (17,899) | $ 34,580
Residential loans held in securitization trusts |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains, net | $ 10,143 |  | $ 8,418 |

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- 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
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