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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)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	10.80%	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	33.90%	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	18.30%	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	14.90%	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	10.50%	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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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