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Distressed and Other Residential Mortgage Loans, At Fair Value - Components of Net Gains (Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Abstract]      
Net realized gains on payoff and sale of loans $ 9,187 $ 4,606 $ 1,719
Net unrealized gains (losses) $ 42,087 $ 4,096 $ (41)