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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Available-for-sale securities	$ 507,666	$ 572,752
Senior IO Securities
Investment Holdings [Line Items]
Available-for-sale securities	140,989	136,546
Re-REMIC
Investment Holdings [Line Items]
Available-for-sale securities	38,875	85,479
Subordinate Securities
Investment Holdings [Line Items]
Available-for-sale securities	327,802	350,727
Subordinate Securities | Mezzanine
Investment Holdings [Line Items]
Available-for-sale securities	92,002	163,715
Subordinate Securities | Subordinate
Investment Holdings [Line Items]
Available-for-sale securities	$ 235,800	$ 187,012

X

- 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

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