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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, 2017	Dec. 31, 2016
New York
Concentration Risk [Line Items]
Geographic concentrations	24.10%	0.00%
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	31.80%	33.80%
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	20.70%	19.90%
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	11.90%	10.80%
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	8.80%	8.90%
Geographic Concentration Risk | Residential Mortgage Loans Held in Securitization Trusts and Real Estate Owned Held in Residential Securitization | Connecticut
Concentration Risk [Line Items]
Geographic concentrations	7.30%	7.40%
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	5.20%	5.10%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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