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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Geographic Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Florida
Concentration Risk [Line Items]
Geographic concentrations	11.30%	3.90%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | New York
Concentration Risk [Line Items]
Geographic concentrations	33.90%	31.80%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Massachusetts
Concentration Risk [Line Items]
Geographic concentrations	20.00%	20.70%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | New Jersey
Concentration Risk [Line Items]
Geographic concentrations	14.50%	11.90%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Florida
Concentration Risk [Line Items]
Geographic concentrations	9.90%	8.80%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Maryland
Concentration Risk [Line Items]
Geographic concentrations	5.30%	5.20%

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