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