Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 17,379,421	$ 17,220,103
Business Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	6,239,276	6,053,820
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,419,572	1,409,901
Business Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,628,635	3,661,218
Personal Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	3,047,809	3,058,195
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,116,160	2,073,123
Revolving home equity
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	356,675	356,650
Credit Card Receivable [Member]
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	568,163	595,930
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 3,131	$ 11,266