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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investment in Securities [Abstract]    
Amortized Cost, Due in 1 year or less $ 19,013  
Amortized Cost, Due after 1 year through 5 years 71,441  
Amortized Cost, Due after 5 years through 10 years 147,006  
Amortized Cost, Due after 10 years 78,349  
Amortized Cost, Total 315,809  
Fair Value, Due in 1 year or less 19,303  
Fair Value, Due after 1 year through 5 years 75,511  
Fair Value, Due after 5 years through 10 years 150,185  
Fair Value, Due after 10 years 80,113  
Fair Value, Total $ 325,112 $ 317,767