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Residential Loans, at Fair Value - Components of Net Gains (Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated SLST | VIE, Primary Beneficiary      
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 $ (31,128) $ 33,479 $ 300
Residential 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 20,403 (4,440) $ 42,087
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 $ 34,932 $ 29,690