Loans And Allowance For Loan Losses (Summary Of Consumer And Other Loans By Payment Status) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Credit Quality [Line Items]
Non-Performing Loans	$ 80,880	$ 106,228
Loans, net of unearned income	8,137,719	6,856,667
Direct Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,178,530	1,029,187
Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,100,324	1,022,025
Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	8,541	7,162
Residential Mortgages [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,092,228	670,936
Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	642,406	661,392
Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	11,420	9,544
Indirect Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	582,037	540,789
Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	567,192	539,810
Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,132	979
Consumer Lines Of Credit [Member]
Credit Quality [Line Items]
Loans, net of unearned income	805,494	607,280
Consumer Lines Of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	731,788	606,533
Consumer Lines Of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	746	747
Other [Member]
Credit Quality [Line Items]
Loans, net of unearned income	39,937	38,261
Other [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	36,437	34,761
Other [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	3,500	3,500
Originated Loans [Member]
Credit Quality [Line Items]
Loans, net of unearned income	7,237,391	6,856,667
Originated Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	1,108,865	1,029,187
Originated Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Loans, net of unearned income	653,826	670,936
Originated Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Loans, net of unearned income	568,324	540,789
Originated Loans [Member] | Consumer Lines Of Credit [Member]
Credit Quality [Line Items]
Loans, net of unearned income	732,534	607,280
Originated Loans [Member] | Other [Member]
Credit Quality [Line Items]
Loans, net of unearned income	$ 39,937	$ 38,261