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Distressed and Other Residential Mortgage Loans, Net - Concentration of Risk (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Florida
Concentration Risk [Line Items]
Geographic concentrations	12.00%	11.30%
Georgia
Concentration Risk [Line Items]
Geographic concentrations	11.80%	15.30%
South Carolina
Concentration Risk [Line Items]
Geographic concentrations	6.30%	9.50%
Texas
Concentration Risk [Line Items]
Geographic concentrations	10.60%	16.60%
Virginia
Concentration Risk [Line Items]
Geographic concentrations	8.40%	9.10%
New Jersey
Concentration Risk [Line Items]
Geographic concentrations	5.00%	2.60%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | North Carolina
Concentration Risk [Line Items]
Geographic concentrations	10.50%	9.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | Florida
Concentration Risk [Line Items]
Geographic concentrations	10.10%	10.40%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | Georgia
Concentration Risk [Line Items]
Geographic concentrations	7.00%	7.20%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | South Carolina
Concentration Risk [Line Items]
Geographic concentrations	5.80%	5.60%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | Texas
Concentration Risk [Line Items]
Geographic concentrations	5.60%	4.90%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | New York
Concentration Risk [Line Items]
Geographic concentrations	5.50%	5.40%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | Ohio
Concentration Risk [Line Items]
Geographic concentrations	5.20%	5.00%
Geographic Concentration Risk | Distressed residential mortgage loans held in securitization trusts (net) | Virginia
Concentration Risk [Line Items]
Geographic concentrations	5.20%	5.30%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentrations	12.10%	9.90%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentrations	36.10%	33.90%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Massachusetts
Concentration Risk [Line Items]
Geographic concentrations	17.20%	20.00%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	12.80%	14.50%
Distressed residential mortgage loans held in securitization trusts (net) | Geographic Concentration Risk | Maryland
Concentration Risk [Line Items]
Geographic concentrations	5.50%	5.30%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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