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Real Estate Securities - Available for Sale Securities by Collateral Type (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Investment Holdings [Line Items]    
Available-for-sale securities $ 399,641 $ 507,666
Senior IO Securities    
Investment Holdings [Line Items]    
Available-for-sale securities 147,490 179,864
Subordinate Securities | Mezzanine    
Investment Holdings [Line Items]    
Available-for-sale securities 37,263 92,002
Subordinate Securities | Subordinate    
Investment Holdings [Line Items]    
Available-for-sale securities $ 214,888 $ 235,800