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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 574,788 | $ 572,752
Senior Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 137,209 | 136,546
Re-REMIC |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 73,730 | 85,479
Subordinate Securities |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 363,849 | 350,727
Subordinate Securities | Mezzanine |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | 153,777 | 163,715
Subordinate Securities | Subordinate |  |
Investment Holdings [Line Items] |  |
Available-for-sale securities | $ 210,072 | $ 187,012

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