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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 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 + Details
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