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Derivative and Hedging Activities (Tables)
6 Months Ended
Jun. 30, 2011
Derivatives and Hedging Activities [Abstract]  
Notional values or contractual amounts and fair value of the Corporation's derivatives designated in hedge relationships
                                                                                                   
    Asset Derivatives       Liability Derivatives  
    June 30, 2011     December 31, 2010     June 30, 2010       June 30, 2011     December 31, 2010     June 30, 2010  
                    Notional/                                                          
    Notional/     Fair     Contract     Fair     Notional/     Fair       Notional/ Contract     Fair     Notional/     Fair     Notional/     Fair  
    Contract Amount     Value (a)     Amount     Value (a)     Contract Amount     Value (a)       Amount     Value (b)     Contract Amount     Value (b)     Contract Amount     Value (b)  
Interest rate swaps:
                                                                                                 
Fair value hedges
  $     $     $ 6,920     $     $     $       $ 267,792     $ 25,772     $ 303,933     $ 28,550     $ 350,743     $ 33,907  
 
(a)   Included in Other Assets on the Consolidated Balance Sheet
 
(b)   Included in Other Liabilities on the Consolidated Balance Sheet
Notional values or contractual amounts and fair value of the Corporation's derivatives not designated in hedge
                                                                                                   
    Asset Derivatives       Liability Derivatives  
    June 30, 2011     December 31, 2010     June 30, 2010       June 30, 2011     December 31, 2010     June 30, 2010  
    Notional/             Notional/             Notional/               Notional/             Notional/             Notional/        
    Contract     Fair     Contract     Fair     Contract     Fair       Contract     Fair     Contract     Fair     Contract     Fair  
    Amount     Value (a)     Amount     Value (a)     Amount     Value (a)       Amount     Value (b)     Amount     Value (b)     Amount     Value (b)  
Interest rate swaps
  $ 863,344     $ 46,246     $ 774,623     $ 44,270     $ 717,915     $ 49,391       $ 863,344     $ 46,246     $ 774,623     $ 44,270     $ 717,915     $ 49,391  
 
                                                                                                 
Mortgage loan commitments
    129,909       1,539       118,119       1,384       200,883       4,057                                        
Forward sales contracts
    84,517       5       113,426       2,106       132,084       (1,939 )                                      
Credit contracts
                                          24,714             44,983             61,175        
Foreign exchange
    4,076       19       3,733       4       3,167       102         4,076       19       3,733       4       3,167       102  
Other
                                          17,506             14,622             14,699        
 
                                                                         
Total
  $ 1,081,846     $ 47,809     $ 1,009,901     $ 47,764     $ 1,054,049     $ 51,611       $ 909,640     $ 46,265     $ 837,961     $ 44,274     $ 796,956     $ 49,493  
 
                                                                         
 
(a)   Included in Other Assets on the Consolidated Balance Sheet
 
(b)   Included in Other Liabilities on the Consolidated Balance Sheet
Gains and losses recognized in income on non-designated hedging instruments
                     
                 
        Amount of Gain / (Loss)  
        Recognized in Income on  
  Location of Gain / (Loss)   Derivative  
Derivatives not designated as   Recognized in Income on   Quarter ended,     Quarter ended,  
hedging instruments   Derivative   June 30, 2011     June 30, 2010  
Mortgage loan commitments
  Other income   $ 107     $ 2,818  
Forward sales contracts
  Other income     175       (2,064 )
 
               
Total
      $ 282     $ 754