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Credit Quality (Summary Of Impaired Loans) (Details) (USD $)
In Thousands
9 Months Ended12 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Financing Receivable, Impaired [Line Items]  
Recorded Investment$ 35,553 
Related Allowance10,246 
Commercial [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment69,98270,832
Unpaid Principal Balance92,34395,725
Average Recorded Investment67,55181,394
Interest Income Recognized34798
Direct Installment [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment7,8474,542
Unpaid Principal Balance8,0914,669
Average Recorded Investment9,8945,613
Interest Income Recognized24477
Residential Mortgages [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment9,4088,032
Unpaid Principal Balance9,5708,055
Average Recorded Investment12,4118,233
Interest Income Recognized208260
Indirect Installment [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment967750
Unpaid Principal Balance1,0621,930
Average Recorded Investment971833
Interest Income Recognized8 
Consumer Lines Of Credit [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,148589
Unpaid Principal Balance1,148604
Average Recorded Investment1,108584
Interest Income Recognized7 
Commercial Leases [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,350979
Unpaid Principal Balance1,350979
Average Recorded Investment1,045749
Other [Member] | With No Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment  
Unpaid Principal Balance  
Related Allowance  
Average Recorded Investment  
Interest Income Recognized  
Commercial [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment35,68137,532
Unpaid Principal Balance38,47139,250
Related Allowance9,01210,313
Average Recorded Investment34,65438,070
Interest Income Recognized65 
Direct Installment [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 6,262
Unpaid Principal Balance 6,340
Related Allowance 626
Average Recorded Investment 4,503
Interest Income Recognized 275
Residential Mortgages [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 5,568
Unpaid Principal Balance 5,568
Related Allowance 557
Average Recorded Investment 4,252
Interest Income Recognized 246
Indirect Installment [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment  
Unpaid Principal Balance  
Related Allowance  
Average Recorded Investment  
Interest Income Recognized  
Consumer Lines Of Credit [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment 217
Unpaid Principal Balance 217
Related Allowance 22
Average Recorded Investment 138
Interest Income Recognized 9
Commercial Leases [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment  
Unpaid Principal Balance  
Related Allowance  
Average Recorded Investment  
Interest Income Recognized  
Other [Member] | With A Specific Allowance Recorded [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment  
Unpaid Principal Balance  
Related Allowance  
Average Recorded Investment  
Interest Income Recognized  
Commercial [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment105,663108,364
Unpaid Principal Balance130,814134,975
Related Allowance9,01210,313
Average Recorded Investment102,205119,464
Interest Income Recognized41298
Direct Installment [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment7,84710,804
Unpaid Principal Balance8,09111,009
Related Allowance 626
Average Recorded Investment9,89410,116
Interest Income Recognized244352
Residential Mortgages [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment9,40813,600
Unpaid Principal Balance9,57013,623
Related Allowance 557
Average Recorded Investment12,44112,485
Interest Income Recognized208506
Indirect Installment [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment967750
Unpaid Principal Balance1,0621,930
Average Recorded Investment971833
Interest Income Recognized8 
Consumer Lines Of Credit [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,148806
Unpaid Principal Balance1,148821
Related Allowance 22
Average Recorded Investment1,108722
Interest Income Recognized79
Commercial Leases [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment1,350979
Unpaid Principal Balance1,350979
Average Recorded Investment1,045749
Other [Member]
  
Financing Receivable, Impaired [Line Items]  
Recorded Investment  
Unpaid Principal Balance  
Related Allowance  
Average Recorded Investment  
Interest Income Recognized