Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 23,461,750	$ 23,299,447
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,057,307	3,961,328
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,347,705	1,369,845
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,940,309	3,798,612
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,219,514	1,281,115
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	12,896,915	12,888,547
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	9,760,733	9,876,592
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,136,182	$ 3,011,955