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Residential Loans, at Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | $ 6,471 | $ 75,051 | $ (18,872) | $ (13,049)
Residential loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | 1,009 | 38,198 | 7,435 | (43,482)
Residential loans held in securitization trusts |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Unrealized gains (losses), net | $ 4,893 | $ 4 | $ 17,143 | $ (1,725)

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