Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 23,299,447	$ 23,921,917
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,961,328	3,886,072
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,369,845	1,446,764
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,798,612	3,986,943
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,281,115	1,551,091
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	12,888,547	13,051,047
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	9,876,592	9,957,284
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,011,955	$ 3,093,763