Credit Quality (Summary Of Age Analysis Of Past Due Loans By Class) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
30-89 Days Past Due	$ 41,410	$ 43,622
>90 Days Past Due and Still Accruing	16,115	8,634
Non-Accrual	107,091	115,589
Total Past Due	164,616	167,845
Current	6,537,979	5,920,310
Total Loans	6,702,595	6,088,155
Commercial [Member]
30-89 Days Past Due	14,152	17,101
>90 Days Past Due and Still Accruing	10,060	3,020
Non-Accrual	97,174	106,724
Total Past Due	121,386	126,845
Current	3,654,901	3,211,147
Total Loans	3,776,287	3,337,992
Direct Installment [Member]
30-89 Days Past Due	8,528	8,603
>90 Days Past Due and Still Accruing	2,458	2,496
Non-Accrual	3,586	3,285
Total Past Due	14,572	14,384
Current	1,024,698	988,341
Total Loans	1,039,270	1,002,725
Residential Mortgages [Member]
30-89 Days Past Due	12,192	9,127
>90 Days Past Due and Still Accruing	2,775	2,144
Non-Accrual	3,832	3,272
Total Past Due	18,799	14,543
Current	657,775	607,699
Total Loans	676,574	622,242
Indirect Installment [Member]
30-89 Days Past Due	4,297	5,659
>90 Days Past Due and Still Accruing	260	394
Non-Accrual	908	750
Total Past Due	5,465	6,803
Current	529,726	507,566
Total Loans	535,191	514,369
Consumer Lines Of Credit [Member]
30-89 Days Past Due	857	1,581
>90 Days Past Due and Still Accruing	479	571
Non-Accrual	851	588
Total Past Due	2,187	2,740
Current	540,283	491,141
Total Loans	542,470	493,881
Commercial Leases [Member]
30-89 Days Past Due	1,339	1,551
>90 Days Past Due and Still Accruing	78	9
Non-Accrual	740	970
Total Past Due	2,157	2,530
Current	91,116	76,899
Total Loans	93,273	79,429
Other [Member]
30-89 Days Past Due	45
>90 Days Past Due and Still Accruing	5
Total Past Due	50
Current	39,480	37,517
Total Loans	$ 39,530	$ 37,517