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Derivatives and Hedging Activity (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position $ 4,681 $ 7,769
Fair Value of Derivatives in a Liability Position 26,294 24,192
Derivatives designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position 63 125
Fair Value of Derivatives in a Liability Position 638 729
Derivatives not designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position 4,618 7,644
Fair Value of Derivatives in a Liability Position 25,656 23,463
Interest rate contracts | Derivatives designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position 63 125
Fair Value of Derivatives in a Liability Position 638 729
Interest rate contracts | Derivatives not designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position 1,874 5,102
Fair Value of Derivatives in a Liability Position 1,819 983
Foreign exchange contracts | Derivatives not designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position 502 269
Fair Value of Derivatives in a Liability Position 23,837 22,480
Credit spread instrument | Derivatives not designated as hedging instruments
   
Fair value of derivative instruments    
Fair Value of Derivatives in an Asset Position $ 2,242 $ 2,273