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Loans and Allowance for Credit Losses (Loans, at Amortized Cost Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
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Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | $ 23,455,587 | $ 23,921,917 | $ 23,983,679
Residential Mortgages [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 3,988,309 | 3,886,072 | 3,721,106
Consumer [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 1,370,520 | 1,446,764 | 1,463,262
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 3,988,661 | 3,986,943 | 4,027,553
Construction and Land Development [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 1,423,615 | 1,551,091 | 1,614,846
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 12,684,482 | 13,051,047 | 13,156,912
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 9,588,309 | 9,957,284 | 10,075,585
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | $ 3,096,173 | $ 3,093,763 | $ 3,081,327

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