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Contingencies and Guarantees (Tables)
6 Months Ended
Jun. 30, 2011
Contingencies and Guarantees [Abstract]  
Remaining contractual amount of each class of commitments to extend credit
         
    June 30, 2011  
Loan Commitments
       
Commercial
  $ 2,367,898  
Consumer
    1,610,194  
 
     
Total loan commitments
  $ 3,978,092  
 
     
Outstanding guarantees
         
    June 30, 2011  
Financial guarantees
       
Standby letters of credit
  $ 109,621  
Loans sold with recourse
    41,576  
 
     
Total financial guarantees
  $ 151,197