Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 23,789,886	$ 23,114,046	$ 21,846,068
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,581,514	3,092,605	2,615,807
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,504,931	1,577,347	1,570,725
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,762,428	3,560,991	3,641,243
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,768,252	1,703,592	1,408,727
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	13,172,761	13,179,511	12,609,566
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	10,113,932	10,146,453	9,645,092
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,058,829	$ 3,033,058	$ 2,964,474