Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	$ 10,683,756	$ 9,696,644
30 - 89 Days Past Due	90,537	67,983
90 Days Past Due and Still Accruing	11,515	15,347
Non-accrual	37,846	51,410
Total	10,823,654	9,831,384
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	3,616,498	3,110,403
30 - 89 Days Past Due	5,837	10,054
90 Days Past Due and Still Accruing	596	1,288
Non-accrual	11,530	13,056
Total	3,634,461	3,134,801
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	342,953	325,541
30 - 89 Days Past Due	11,126	16,721
90 Days Past Due and Still Accruing	83	56
Non-accrual	9,032	13,678
Total	363,194	355,996
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	2,310,501	2,194,395
30 - 89 Days Past Due	35,495	3,276
90 Days Past Due and Still Accruing	0	0
Non-accrual	11,898	17,304
Total	2,357,894	2,214,975
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,747,785	1,564,281
30 - 89 Days Past Due	12,176	10,862
90 Days Past Due and Still Accruing	1,262	2,854
Non-accrual	5,386	6,862
Total	1,766,609	1,584,859
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,473,403	1,273,581
30 - 89 Days Past Due	14,008	13,926
90 Days Past Due and Still Accruing	1,655	2,143
Non-accrual	0	0
Total	1,489,066	1,289,650
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	419,333	433,437
30 - 89 Days Past Due	1,576	2,121
90 Days Past Due and Still Accruing	660	1,499
Non-accrual	0	510
Total	421,569	437,567
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	769,906	786,081
30 - 89 Days Past Due	10,050	10,657
90 Days Past Due and Still Accruing	7,259	7,507
Non-accrual	0	0
Total	787,215	804,245
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	3,377	8,925
30 - 89 Days Past Due	269	366
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 3,646	$ 9,291