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Investment in Securities (Schedule of Amortized Cost and Fair Value of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investment in Securities [Abstract]    
Amortized Cost, Due in 1 year or less $ 12,838  
Amortized Cost, Due after 1 year through 5 years 69,279  
Amortized Cost, Due after 5 years through 10 years 139,442  
Amortized Cost, Due after 10 years 79,522  
Amortized Cost, Total 301,081  
Fair Value, Due in 1 year or less 12,961  
Fair Value, Due after 1 year through 5 years 73,393  
Fair Value, Due after 5 years through 10 years 141,773  
Fair Value, Due after 10 years 80,594  
Fair Value, Total $ 308,721 $ 341,935