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Distressed Residential Mortgage Loans, Net - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Florida
Concentration Risk [Line Items]
Geographic concentrations	11.30%	3.90%
Georgia
Concentration Risk [Line Items]
Geographic concentrations	15.30%	3.40%
South Carolina
Concentration Risk [Line Items]
Geographic concentrations	9.50%	7.00%
Virginia
Concentration Risk [Line Items]
Geographic concentrations	9.10%	10.80%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.40%	11.20%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | North Carolina
Concentration Risk [Line Items]
Geographic concentrations	9.00%	8.30%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Geographic concentrations	7.20%	5.80%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | South Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.60%	5.00%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentrations	5.40%	5.70%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Virginia
Concentration Risk [Line Items]
Geographic concentrations	5.30%	4.90%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Ohio
Concentration Risk [Line Items]
Geographic concentrations	5.00%	5.10%

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