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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)