Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans And Allowance For Loan Losses [Line Items]
Total	$ 17,786,767	$ 17,220,103
Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	11,593,444	11,124,939
Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,193,323	6,095,164
Business Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,414,792	6,053,820
Business Loan [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	6,414,792	6,053,820
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Total	1,433,652	1,409,901
Real estate - construction and land | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	1,433,652	1,409,901
Business Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,745,000	3,661,218
Business Real Estate Loan [Member] | Commercial Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,745,000	3,661,218
Personal Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,070,980	3,058,195
Personal Real Estate Loan [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	3,070,980	3,058,195
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,171,599	2,073,123
Consumer Loan [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	2,171,599	2,073,123
Revolving home equity
Loans And Allowance For Loan Losses [Line Items]
Total	364,241	356,650
Revolving home equity | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	364,241	356,650
Credit Card Receivable [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	575,317	595,930
Credit Card Receivable [Member] | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	575,317	595,930
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Total	11,186	11,266
Overdrafts | Personal Banking Portfolio Segment [Member]
Loans And Allowance For Loan Losses [Line Items]
Total	$ 11,186	$ 11,266