Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 24,580,173	$ 23,958,440
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,909,076	4,016,917
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,347,871	1,340,178
Commercial Real Estate - Income Producing [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,602,813	4,283,168
Construction and Land Development [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,405,454	1,239,086
Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	13,314,959	13,079,091
Total Commercial And Industrial [Member] \| Commercial Non-Real Estate [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	9,961,458	9,809,011
Total Commercial And Industrial [Member] \| Commercial Real Estate - Owner Occupied [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 3,353,501	$ 3,270,080