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Distressed Residential Mortgage Loans - Geographic Concentrations of Credit Risk (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
New York
Concentration Risk [Line Items]
Geographic concentration, percent	21.60%	0.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.60%	12.20%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | North Carolina
Concentration Risk [Line Items]
Geographic concentration, percent	8.20%	7.70%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | Georgia
Concentration Risk [Line Items]
Geographic concentration, percent	7.40%	6.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | California
Concentration Risk [Line Items]
Geographic concentration, percent	6.60%	8.80%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | New York
Concentration Risk [Line Items]
Geographic concentration, percent	5.50%	5.40%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trust (net) | Ohio
Concentration Risk [Line Items]
Geographic concentration, percent	5.00%	4.80%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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