Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 17,298,840	$ 17,205,479
Business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	5,994,974	6,019,036
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	1,497,647	1,446,764
Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,711,602	3,719,306
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,039,885	3,026,041
Consumer
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,119,308	2,077,723
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	322,523	319,894
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	564,388	589,913
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 48,513	$ 6,802