Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 17,129,326	$ 16,303,131
Business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	5,908,330	5,661,725
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	1,539,566	1,361,095
Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,647,168	3,406,981
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,024,639	2,918,078
Consumer
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,125,804	2,059,088
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	305,237	297,207
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	574,829	584,000
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 3,753	$ 14,957