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Residential Loans, at Fair Value - Components of Net Gain (Loss) on Residential Mortgages (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 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 $ (25,343) $ (88,100)
Residential loans    
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]    
Unrealized gains (losses), net 6,426 (81,680)
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 $ 12,251 $ (1,730)