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Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | $ 23,596,565 | $ 23,299,447
Residential Mortgages [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 4,027,600 | 3,961,328
Consumer [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 1,335,162 | 1,369,845
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 4,076,643 | 3,798,612
Construction and Land Development [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 1,197,305 | 1,281,115
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Accounts Notes And Loans Receivable [Line Items] |  |
Total loans | 12,959,855 | 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 | 9,680,597 | 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 | $ 3,279,258 | $ 3,011,955

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