Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 17,163,065	$ 17,205,479
Business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	6,090,724	6,019,036
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	1,396,515	1,446,764
Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,572,539	3,719,306
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,055,182	3,026,041
Consumer
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,145,609	2,077,723
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	331,381	319,894
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	566,925	589,913
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 4,190	$ 6,802