Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 17,093,789	$ 17,080,238
30 – 89 Days Past Due	83,520	96,065
90 Days Past Due and Still Accruing	24,516	21,864
Non-accrual	18,278	7,312
Total	17,220,103	17,205,479
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,053,820	6,019,036
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,409,901	1,446,764
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,661,218	3,719,306
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,058,195	3,026,041
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,073,123	2,077,723
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	356,650	319,894
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	595,930	589,913
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	11,266	6,802
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	11,124,939	11,185,106
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	6,051,654	5,985,713
30 – 89 Days Past Due	1,501	29,087
90 Days Past Due and Still Accruing	564	614
Non-accrual	101	3,622
Total	6,053,820	6,019,036
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	1,409,681	1,446,764
30 – 89 Days Past Due	0	0
90 Days Past Due and Still Accruing	0	0
Non-accrual	220	0
Total	1,409,901	1,446,764
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	3,640,643	3,714,579
30 – 89 Days Past Due	5,621	4,582
90 Days Past Due and Still Accruing	0	85
Non-accrual	14,954	60
Total	3,661,218	3,719,306
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,095,164	6,020,373
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	3,021,017	2,999,988
30 – 89 Days Past Due	25,267	14,841
90 Days Past Due and Still Accruing	10,885	9,559
Non-accrual	1,026	1,653
Total	3,058,195	3,026,041
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,029,115	2,036,353
30 – 89 Days Past Due	40,398	38,217
90 Days Past Due and Still Accruing	3,610	3,153
Non-accrual	0	0
Total	2,073,123	2,077,723
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	351,056	315,483
30 – 89 Days Past Due	2,798	1,564
90 Days Past Due and Still Accruing	819	870
Non-accrual	1,977	1,977
Total	356,650	319,894
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	579,670	574,805
30 – 89 Days Past Due	7,622	7,525
90 Days Past Due and Still Accruing	8,638	7,583
Non-accrual	0	0
Total	595,930	589,913
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	10,953	6,553
30 – 89 Days Past Due	313	249
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 11,266	$ 6,802