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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Schedule of Geographic Concentrations of Credit Risk (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
New York
Concentration Risk [Line Items]
Geographic concentration, percent	23.90%	24.10%
Florida
Concentration Risk [Line Items]
Geographic concentration, percent	13.50%	3.90%
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	31.90%	31.80%
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	19.50%	20.70%
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	13.00%	11.90%
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	9.40%	8.80%
Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Geographic Concentration Risk | Connecticut
Concentration Risk [Line Items]
Geographic concentration, percent	7.70%	7.30%
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	4.90%	5.20%

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