Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	$ 11,105,928	$ 10,839,081
30 - 89 Days Past Due	56,050	54,975
90 Days Past Due and Still Accruing	12,487	13,966
Non-accrual	47,573	48,814
Total	11,222,038	10,956,836
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	3,922,118	3,697,589
30 - 89 Days Past Due	7,780	5,467
90 Days Past Due and Still Accruing	485	671
Non-accrual	11,011	11,592
Total	3,941,394	3,715,319
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	409,592	386,423
30 - 89 Days Past Due	4,609	9,601
90 Days Past Due and Still Accruing	19	0
Non-accrual	9,447	10,173
Total	423,667	406,197
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	2,284,479	2,292,385
30 - 89 Days Past Due	11,592	1,340
90 Days Past Due and Still Accruing	42	47
Non-accrual	19,054	19,778
Total	2,315,167	2,313,550
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,766,163	1,771,231
30 - 89 Days Past Due	11,569	9,755
90 Days Past Due and Still Accruing	767	1,560
Non-accrual	4,332	5,080
Total	1,782,831	1,787,626
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,547,246	1,492,960
30 - 89 Days Past Due	10,980	17,482
90 Days Past Due and Still Accruing	2,209	2,274
Non-accrual	1,538	0
Total	1,561,973	1,512,716
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	415,637	416,614
30 - 89 Days Past Due	884	1,082
90 Days Past Due and Still Accruing	664	702
Non-accrual	2,191	2,191
Total	419,376	420,589
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	758,313	777,564
30 - 89 Days Past Due	8,430	9,952
90 Days Past Due and Still Accruing	8,301	8,712
Non-accrual	0	0
Total	775,044	796,228
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	2,380	4,315
30 - 89 Days Past Due	206	296
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 2,586	$ 4,611