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Distressed Residential Mortgage Loans - Geographic Concentrations of Credit Risk (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	13.50%	3.90%
New York
Concentration Risk [Line Items]
Geographic concentration, percent	23.90%	24.10%
South Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	5.60%	7.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	11.20%	11.20%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	8.50%	8.30%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | California
Concentration Risk [Line Items]
Geographic concentration, percent	6.90%	6.90%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Georgia
Concentration Risk [Line Items]
Geographic concentration, percent	6.00%	5.80%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | New York
Concentration Risk [Line Items]
Geographic concentration, percent	5.90%	5.70%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | South Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	5.30%	5.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts, net | Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	5.00%	5.10%

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