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Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | $ 23,991,840 | $ 23,958,440
Residential Mortgages [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 3,950,154 | 4,016,917
Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 1,328,039 | 1,340,178
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 4,382,665 | 4,283,168
Construction and Land Development [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 1,320,224 | 1,239,086
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 13,010,758 | 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 | 9,710,891 | 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 | $ 3,299,867 | $ 3,270,080

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