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Real Estate Securities - Trading Securities by Collateral Type (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Trading securities | $ 341,269 | $ 404,011
Senior Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 24,492 | 254,351
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 19,098 | 248,570
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 5,394 | 5,781
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 316,777 | 149,660
Subordinate Securities | Prime mezzanine |  |
Investment Holdings [Line Items] |  |
Trading securities | 194,832 | 136,140
Subordinate Securities | Prime subordinate |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 121,945 | $ 13,520

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