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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Trading securities	$ 860,540	$ 1,118,612
Senior IO Securities
Investment Holdings [Line Items]
Trading securities	150,067	158,670
Subordinate Securities | Mezzanine
Investment Holdings [Line Items]
Trading securities	538,489	610,819
Subordinate Securities | Subordinate
Investment Holdings [Line Items]
Trading securities	$ 171,984	$ 349,123

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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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