Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 23,098,146	$ 23,299,447
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,025,145	3,961,328
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,337,826	1,369,845
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,809,664	3,798,612
Construction and Land Development [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,287,919	1,281,115
Total Commercial And Industrial [Member] | Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	12,637,592	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	9,636,594	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	$ 3,000,998	$ 3,011,955