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Derivatives and Hedging Activities (Tables)
6 Months Ended
Jun. 30, 2011
Derivatives and Hedging Activities  
Schedule of Fair Value Derivative Instruments
     Asset Derivatives      Liability Derivatives  
As of June 30,    2011      2010      2011      2010  
(in thousands)    Balance Sheet
Location
   Fair Value      Balance Sheet
Location
   Fair Value      Balance Sheet
Location
   Fair Value      Balance Sheet
Location
   Fair Value  

Derivatives not designated as hedging instruments

                       

Interest rate contracts

   Other assets    $ 10,476       Other assets    $ 12,002       Other liabilities    $ 10,476       Other liabilities    $ 12,002