Loans And Allowance For Loan Losses (Summary Of Consumer And Other Loans By Payment Activity) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Credit Quality [Line Items]
Non-Performing Loans	$ 82,943	$ 106,228
Loans, net of unearned income	7,979,450	6,856,667
Direct Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,128,310	1,029,187
Residential Mortgage [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,121,237	670,936
Indirect Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	583,939	540,789
Consumer Lines Of Credit [Member]
Credit Quality [Line Items]
Loans, net of unearned income	780,155	607,280
Other [Member]
Credit Quality [Line Items]
Loans, net of unearned income	37,462	38,261
Performing Financing Receivable [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Performing Loans	1,121,496	1,022,025
Performing Financing Receivable [Member] | Residential Mortgage [Member]
Credit Quality [Line Items]
Performing Loans	1,110,302	661,392
Performing Financing Receivable [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Performing Loans	582,817	539,810
Performing Financing Receivable [Member] | Consumer Lines Of Credit [Member]
Credit Quality [Line Items]
Performing Loans	779,628	606,533
Performing Financing Receivable [Member] | Other [Member]
Credit Quality [Line Items]
Performing Loans	33,962	34,761
Nonperforming Financing Receivable [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Non-Performing Loans	6,814	7,162
Nonperforming Financing Receivable [Member] | Residential Mortgage [Member]
Credit Quality [Line Items]
Non-Performing Loans	10,935	9,544
Nonperforming Financing Receivable [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,122	979
Nonperforming Financing Receivable [Member] | Consumer Lines Of Credit [Member]
Credit Quality [Line Items]
Non-Performing Loans	527	747
Nonperforming Financing Receivable [Member] | Other [Member]
Credit Quality [Line Items]
Non-Performing Loans	$ 3,500	$ 3,500