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Other Real Estate Securities (Summary of Realized Gains) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale securities $ 0   $ 0   $ 0
Sale Price     0 $ 9,253  
Realized Gain $ 0 $ 0 $ 0 546  
Other Real Estate Securities          
Schedule of Available-for-sale Securities [Line Items]          
Aggregate Cost Basis       8,707  
Sale Price       9,253  
Realized Gain       $ 546