Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 17,080,238	$ 16,229,187
30 – 89 Days Past Due	96,065	49,808
90 Days Past Due and Still Accruing	21,864	15,830
Non-accrual	7,312	8,306
Total	17,205,479	16,303,131
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,019,036	5,661,725
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,446,764	1,361,095
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,719,306	3,406,981
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,026,041	2,918,078
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,077,723	2,059,088
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	319,894	297,207
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	589,913	584,000
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,802	14,957
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	5,985,713	5,652,710
30 – 89 Days Past Due	29,087	1,759
90 Days Past Due and Still Accruing	614	505
Non-accrual	3,622	6,751
Commercial Portfolio Segment [Member] | Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	1,446,764	1,361,095
30 – 89 Days Past Due	0	0
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	3,714,579	3,406,207
30 – 89 Days Past Due	4,582	585
90 Days Past Due and Still Accruing	85	0
Non-accrual	60	189
Personal Banking Portfolio Segment [Member] | Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,999,988	2,895,742
30 – 89 Days Past Due	14,841	14,289
90 Days Past Due and Still Accruing	9,559	6,681
Non-accrual	1,653	1,366
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,036,353	2,031,827
30 – 89 Days Past Due	38,217	25,089
90 Days Past Due and Still Accruing	3,153	2,172
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	315,483	295,303
30 – 89 Days Past Due	1,564	1,201
90 Days Past Due and Still Accruing	870	703
Non-accrual	1,977	0
Personal Banking Portfolio Segment [Member] | Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	574,805	572,213
30 – 89 Days Past Due	7,525	6,238
90 Days Past Due and Still Accruing	7,583	5,549
Non-accrual	0	0
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	6,553	14,090
30 – 89 Days Past Due	249	647
90 Days Past Due and Still Accruing	0	220
Non-accrual	$ 0	$ 0