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Derivatives and Hedging Activity (Details 2) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value$ 3,649$ 337
Derivative in Liability Position, Fair Value21,0629,400
Interest rate swaps | Derivatives designated as cash flow hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value 89
Derivative in Liability Position, Fair Value1,6111,714
Interest rate swaps | Derivatives not designated as hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value 248
Derivative in Liability Position, Fair Value11,154303
Forward contracts | Derivatives not designated as hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value3,588 
Derivative in Liability Position, Fair Value8,2977,383
Credit spread derivatives | Derivatives not designated as hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value61 
Derivatives designated as cash flow hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value 89
Derivative in Liability Position, Fair Value1,6111,714
Derivatives not designated as hedging instruments
  
Fair value of derivative instruments  
Derivative in a Asset Position, Fair Value3,649248
Derivative in Liability Position, Fair Value$ 19,451$ 7,686