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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, Due in 1 year or less $ 36,857  
Amortized Cost, Due after 1 year through 5 years 56,860  
Amortized Cost, Due after 5 years through 10 years 146,015  
Amortized Cost, Due after 10 years 125,752  
Amortized Cost, Total 365,484  
Fair Value, Due in 1 year or less 37,215  
Fair Value, Due after 1 year through 5 years 58,725  
Fair Value, Due after 5 years through 10 years 155,834  
Fair Value, Due after 10 years 130,897  
Fair Value, Total $ 382,671 $ 375,696