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Distressed and Other Residential Mortgage Loans, Net - Schedule of Geographic Concentrations of Credit Risk Exceeding 5% of Total Loan Balances (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	5.00%	2.60%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	9.40%	11.30%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New York
Concentration Risk [Line Items]
Geographic concentration, percent	36.00%	33.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Massachusetts
Concentration Risk [Line Items]
Geographic concentration, percent	17.50%	20.00%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | New Jersey
Concentration Risk [Line Items]
Geographic concentration, percent	12.60%	14.50%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Florida
Concentration Risk [Line Items]
Geographic concentration, percent	11.80%	9.90%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Maryland
Concentration Risk [Line Items]
Geographic concentration, percent	5.40%	5.30%

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