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Residential Loans - Components of Net Gains (Losses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
VIE, Primary Beneficiary | Consolidated SLST |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unrealized gain (loss) on real estate mortgage loans, net | $ 33,479 | $ 300 |
Residential mortgage loans held in securitization trust, at fair value |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unrealized gain (loss) on real estate mortgage loans, net | 29,690 |  |
Residential Mortgage Loans |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |
Unrealized gain (loss) on real estate mortgage loans, net | $ (4,440) | $ 42,087 | $ 4,096

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