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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Investment in Securities [Abstract]    
Amortized Cost, Due in 1 year or less $ 24,170  
Amortized Cost, Due after 1 year through 5 years 77,390  
Amortized Cost, Due after 5 years through 10 years 139,950  
Amortized Cost, Due after 10 years 110,957  
Amortized Cost, Total 352,467  
Fair Value, Due in 1 year or less 24,432  
Fair Value, Due after 1 year through 5 years 80,845  
Fair Value, Due after 5 years through 10 years 145,190  
Fair Value, Due after 10 years 112,686  
Fair Value, Total $ 363,153 $ 356,141