Allowance For Loan Losses (Summary Of Individual And Collective Allowance For Loan Losses And Loan Balances) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Allowance for loans individually evaluated for impairment	$ 8,440
Allowance for loans collectively evaluated for impairment	100,784
Loans Outstanding	6,702,595	6,088,155
Loans outstanding individually evaluated for impairment	115,156
Loans outstanding collectively evaluated for impairment	6,587,439
Commercial [Member]
Allowance for loans individually evaluated for impairment	8,440
Allowance for loans collectively evaluated for impairment	69,518
Loans Outstanding	3,776,287	3,337,992
Loans outstanding individually evaluated for impairment	115,156
Loans outstanding collectively evaluated for impairment	3,661,131
Direct Installment [Member]
Allowance for loans collectively evaluated for impairment	14,915
Loans Outstanding	1,039,270	1,002,725
Loans outstanding collectively evaluated for impairment	1,039,270
Residential Mortgages [Member]
Allowance for loans collectively evaluated for impairment	4,480
Loans Outstanding	676,574	622,242
Loans outstanding collectively evaluated for impairment	676,574
Indirect Installment [Member]
Allowance for loans collectively evaluated for impairment	5,705
Loans Outstanding	535,191	514,369
Loans outstanding collectively evaluated for impairment	535,191
Consumer Lines Of Credit [Member]
Allowance for loans collectively evaluated for impairment	4,796
Loans Outstanding	542,470	493,881
Loans outstanding collectively evaluated for impairment	542,470
Commercial Leases [Member]
Allowance for loans collectively evaluated for impairment	1,273
Loans Outstanding	93,273	79,429
Loans outstanding collectively evaluated for impairment	93,273
Other [Member]
Allowance for loans collectively evaluated for impairment	97
Loans Outstanding	39,530	37,517
Loans outstanding collectively evaluated for impairment	$ 39,530