Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 17,090,000	$ 17,205,479
Business Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	6,048,328	6,019,036
Real estate – construction and land
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	1,381,607	1,446,764
Business Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,586,999	3,719,306
Personal Real Estate Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,043,391	3,026,041
Consumer Loan [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,108,281	2,077,723
Revolving home equity
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	342,376	319,894
Credit Card Receivable [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	574,746	589,913
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 4,272	$ 6,802