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Residential Mortgage Loans Held in Securitization Trusts, Net and Real Estate Owned - Loans in Delinquency (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans, Real estate owned through foreclosure | loan	1	1
Total Unpaid Principal, Real estate owned through foreclosure | $	$ 118	$ 268
% of Loan Portfolio, Real estate owned through foreclosure	0.15%	0.27%
30 - 60
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan	1	1
Total Unpaid Principal | $	$ 203	$ 247
% of Loan Portfolio	0.26%	0.25%
61 - 90
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan	1	0
Total Unpaid Principal | $	$ 173	$ 0
% of Loan Portfolio	0.22%	0.00%
90
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of Delinquent Loans | loan	24	30
Total Unpaid Principal | $	$ 16,147	$ 18,416
% of Loan Portfolio	20.80%	18.68%

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- Definition

Financing Receivable, Recorded Investment Past Due, Real Estate Owned Through Foreclosure.

+ References

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- Definition

The aggregate number of delinquent loans.

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- Definition

Number of delinquent loans through foreclosure.

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Percent of loan portfolio.

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- Definition

The aggregate percentage of the loan portfolio through foreclosure.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7A
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524

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