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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 450,288 | $ 507,666
Senior IO Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 165,610 | 179,864
Subordinate Securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 67,291 | 92,002
Subordinate Securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 217,387 | $ 235,800

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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