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Derivative Instruments (Tables)
3 Months Ended
Mar. 31, 2012
Derivative Instruments [Abstract]  
Fair Value Of The Corporation's Derivative Financial Instruments And Their Classification On The Balance Sheet
     Balance
Sheet
Location
   March 31,
2012
     December 31,
2011
 

Interest Rate Products:

        

Asset derivatives

   Other assets    $ 48,813       $ 52,857   

Liability derivatives

   Other liabilities      49,093         52,904   
Effect Of The Corporation's Derivative Financial Instruments On The Income Statement
     Income    Three Months Ended  
     Statement    March 31,  
     Location    2012     2011  

Interest rate products

   Other income    $ (233   $ (153