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Derivative Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Designated as hedging instruments [Member]
   
Derivative financial instruments    
Derivative instruments $ 1,904 $ 2,164
Not designated as hedging instruments [Member]
   
Derivative financial instruments    
Derivative assets 3,864 4,654
Derivative instruments 2,880 3,350
Other Assets [Member] | Not designated as hedging instruments [Member] | Interest rate contracts [Member]
   
Derivative financial instruments    
Derivative assets 1,488 3,083
Other Assets [Member] | Not designated as hedging instruments [Member] | Interest rate lock commitments [Member]
   
Derivative financial instruments    
Derivative assets 2,376 1,571
Other Liabilities [Member] | Designated as hedging instruments [Member] | Interest rate swaps [Member]
   
Derivative financial instruments    
Derivative instruments 1,904 2,164
Other Liabilities [Member] | Not designated as hedging instruments [Member] | Interest rate contracts [Member]
   
Derivative financial instruments    
Derivative instruments 1,488 3,152
Other Liabilities [Member] | Not designated as hedging instruments [Member] | Forward commitments [Member]
   
Derivative financial instruments    
Derivative instruments $ 1,392 $ 198