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Distressed and Other Residential Mortgage Loans, At Fair Value - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Florida
Concentration Risk [Line Items]
Geographic concentrations	12.00%	11.30%
Texas
Concentration Risk [Line Items]
Geographic concentrations	10.60%	16.60%
New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.00%	2.60%
Residential mortgage loans, at fair value | Geographic Concentration Risk | California
Concentration Risk [Line Items]
Geographic concentrations	23.90%	27.90%
Residential mortgage loans, at fair value | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentrations	9.40%	9.00%
Residential mortgage loans, at fair value | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentrations	8.00%	5.10%
Residential mortgage loans, at fair value | Geographic Concentration Risk | Texas
Concentration Risk [Line Items]
Geographic concentrations	5.40%	4.20%
Residential mortgage loans, at fair value | Geographic Concentration Risk | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.10%	3.80%

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