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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 595,641 | $ 829,245
Senior Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 71,290 | 279,251
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 63,469 | 210,993
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 7,821 | 68,258
Re-REMIC |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 161,234 | 165,064
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 363,117 | 384,930
Subordinate Securities | Prime mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 177,468 | 224,624
Subordinate Securities | Prime subordinate |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 185,649 | $ 160,306

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