Loans And Allowance For Credit Losses (Aging Information On Past Due And Accruing Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	$ 17,648,771	$ 17,093,789
30 – 89 Days Past Due	82,083	83,520
90 Days Past Due and Still Accruing	24,659	24,516
Non-accrual	15,750	18,278
Total	17,771,263	17,220,103
Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,439,380	6,053,820
Real Estate - Construction And Land [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,438,012	1,409,901
Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,674,567	3,661,218
Real Estate - Personal [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,053,435	3,058,195
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,196,822	2,073,123
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	375,159	356,650
Consumer Credit Card [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	589,694	595,930
Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	4,194	11,266
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	11,551,959	11,124,939
Commercial Portfolio Segment [Member] | Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	6,437,476	6,051,654
30 – 89 Days Past Due	1,241	1,501
90 Days Past Due and Still Accruing	540	564
Non-accrual	123	101
Total	6,439,380	6,053,820
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	1,437,727	1,409,681
30 – 89 Days Past Due	285	0
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	220
Total	1,438,012	1,409,901
Commercial Portfolio Segment [Member] | Real Estate - Business [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	3,636,517	3,640,643
30 – 89 Days Past Due	23,265	5,621
90 Days Past Due and Still Accruing	0	0
Non-accrual	14,785	14,954
Total	3,674,567	3,661,218
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,219,304	6,095,164
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	3,021,212	3,021,017
30 – 89 Days Past Due	19,450	25,267
90 Days Past Due and Still Accruing	11,931	10,885
Non-accrual	842	1,026
Total	3,053,435	3,058,195
Personal Banking Portfolio Segment [Member] | Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	2,165,109	2,029,115
30 – 89 Days Past Due	28,269	40,398
90 Days Past Due and Still Accruing	3,444	3,610
Non-accrual	0	0
Total	2,196,822	2,073,123
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	373,245	351,056
30 – 89 Days Past Due	1,493	2,798
90 Days Past Due and Still Accruing	421	819
Non-accrual	0	1,977
Total	375,159	356,650
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	573,698	579,670
30 – 89 Days Past Due	7,673	7,622
90 Days Past Due and Still Accruing	8,323	8,638
Non-accrual	0	0
Total	589,694	595,930
Personal Banking Portfolio Segment [Member] | Overdrafts [Member]
Loans And Allowance For Loan Losses [Line Items]
Current or Less than 30 days Past Due	3,787	10,953
30 – 89 Days Past Due	407	313
90 Days Past Due and Still Accruing	0	0
Non-accrual	0	0
Total	$ 4,194	$ 11,266