Loans And Allowance For Loan Losses (Aging Information On Past Due And Accruing Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	$ 10,839,081	$ 9,696,644
30 – 89 Days Past Due	54,975	67,983
90 Days Past Due and Still Accruing	13,966	15,347
Non-accrual	48,814	51,410
Total	10,956,836	9,831,384
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	3,697,589	3,110,403
30 – 89 Days Past Due	5,467	10,054
90 Days Past Due and Still Accruing	671	1,288
Non-accrual	11,592	13,056
Total	3,715,319	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	386,423	325,541
30 – 89 Days Past Due	9,601	16,721
90 Days Past Due and Still Accruing	0	56
Non-accrual	10,173	13,678
Total	406,197	355,996
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	2,292,385	2,194,395
30 – 89 Days Past Due	1,340	3,276
90 Days Past Due and Still Accruing	47	0
Non-accrual	19,778	17,304
Total	2,313,550	2,214,975
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,771,231	1,564,281
30 – 89 Days Past Due	9,755	10,862
90 Days Past Due and Still Accruing	1,560	2,854
Non-accrual	5,080	6,862
Total	1,787,626	1,584,859
Consumer [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	1,492,960	1,273,581
30 – 89 Days Past Due	17,482	13,926
90 Days Past Due and Still Accruing	2,274	2,143
Non-accrual	0	0
Total	1,512,716	1,289,650
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	416,614	433,437
30 – 89 Days Past Due	1,082	2,121
90 Days Past Due and Still Accruing	702	1,499
Non-accrual	2,191	510
Total	420,589	437,567
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	777,564	786,081
30 – 89 Days Past Due	9,952	10,657
90 Days Past Due and Still Accruing	8,712	7,507
Non-accrual	0	0
Total	796,228	804,245
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less Than 30 Days Past Due	4,315	8,925
30 – 89 Days Past Due	296	366
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 4,611	$ 9,291