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Distressed and Other Residential Mortgage Loans, At Fair Value - Concentration of Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Florida
Concentration Risk [Line Items]
Geographic concentrations	11.30%	3.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | California
Concentration Risk [Line Items]
Geographic concentrations	27.90%	35.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | Florida
Concentration Risk [Line Items]
Geographic concentrations	9.00%	6.60%
Geographic Concentration Risk | Residential mortgage loans, at fair value | Maryland
Concentration Risk [Line Items]
Geographic concentrations	5.20%	1.90%
Geographic Concentration Risk | Residential mortgage loans, at fair value | New York
Concentration Risk [Line Items]
Geographic concentrations	5.10%	3.80%

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