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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investment Holdings [Line Items]
Trading securities	$ 1,118,612	$ 968,844
Senior IO Securities
Investment Holdings [Line Items]
Trading securities	158,670	69,974
Subordinate Securities | Mezzanine
Investment Holdings [Line Items]
Trading securities	610,819	563,475
Subordinate Securities | Subordinate
Investment Holdings [Line Items]
Trading securities	$ 349,123	$ 335,395

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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