Loans And Allowance For Credit Losses (Summary Classification Of Held To Maturity Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 15,686,627	$ 15,176,359
Business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	5,441,592	5,303,535
Real estate - construction and land
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	1,266,260	1,118,266
Real estate - business
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	3,215,578	3,058,837
Real estate - personal
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,836,835	2,805,401
Consumer
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	2,089,592	2,032,225
Revolving Home Equity [Member]
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	271,854	275,945
Consumer credit card
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	558,102	575,410
Overdrafts
Loans And Allowance For Loan Losses [Line Items]
Held for Investment Loans	$ 6,814	$ 6,740