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Premises and Equipment (Tables)
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block]
  At December 31,
(dollar amounts in thousands) 2011  2010
Land and land improvements$ 123,312 $ 120,069
Buildings  375,603   367,003
Leasehold improvements  218,957   204,830
Equipment  635,175   613,301
Total premises and equipment  1,353,047   1,305,203
Less accumulated depreciation and amortization  (788,618)   (813,601)
Net premises and equipment$ 564,429 $ 491,602
      
      
Depreciation And Amoritzation Charged to Expenase and Rental Income Credited To Net Occupancy Expense [Table Text Block]
(dollar amounts in thousands) 2011  2010  2009
         
Total depreciation and amortization of premises and equipment$ 70,413 $ 64,934 $ 66,089
Rental income credited to occupancy expense  10,878   10,108   11,755