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Distressed Residential Mortgage Loans - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
New York
Concentration Risk [Line Items]
Geographic concentrations	24.10%	0.00%
South Carolina
Concentration Risk [Line Items]
Geographic concentrations	7.00%	9.40%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentrations	11.20%	12.20%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | North Carolina
Concentration Risk [Line Items]
Geographic concentrations	8.30%	7.70%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | California
Concentration Risk [Line Items]
Geographic concentrations	6.90%	8.80%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Georgia
Concentration Risk [Line Items]
Geographic concentrations	5.80%	6.00%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentrations	5.70%	5.40%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Ohio
Concentration Risk [Line Items]
Geographic concentrations	5.10%	4.80%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | South Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.00%	4.00%

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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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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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