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Derivative Financial Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Schedule of fair value derivative financial instruments    
Derivatives not designated as hedging instruments $ 3,502 $ 3,817
Total asset derivatives 3,502 3,817
Derivatives designated as hedging instruments 1,093 1,233
Derivatives not designated as hedging instruments 3,502 3,817
Total liability derivatives 4,595 5,050
Interest rate contracts [Member] | Other Assets [Member]
   
Schedule of fair value derivative financial instruments    
Derivatives not designated as hedging instruments 3,502 3,817
Interest rate contracts [Member] | Other Liabilities [Member]
   
Schedule of fair value derivative financial instruments    
Derivatives designated as hedging instruments 1,093 1,233
Derivatives not designated as hedging instruments $ 3,502 $ 3,817