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Residential Loans - Components of Net Gains (Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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