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Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 37,932,613 | $ 35,485,776
Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,904,462 | 4,388,531
Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,088,289 | 8,130,118
Consumer real estate – mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss |  | 4,914,482
Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,389,451 | 3,699,321
Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 15,570,921 | 13,815,817
Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 606,380 | 537,507
Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,373,110 | 4,914,482
30-59 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 34,197 | 47,769
30-59 days past due | Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,983 | 7,857
30-59 days past due | Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 179 | 1,217
30-59 days past due | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 293 | 125
30-59 days past due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 19,693 | 15,992
30-59 days past due | Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,689 | 2,592
30-59 days past due | Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,360 | 19,986
60-89 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 32,139 | 14,362
60-89 days past due | Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,448 | 2,726
60-89 days past due | Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,591 | 0
60-89 days past due | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 247 | 0
60-89 days past due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 12,336 | 8,515
60-89 days past due | Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,613 | 1,500
60-89 days past due | Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 14,904 | 1,621
90 days or more past due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 87,614 | 103,951
90 days or more past due | Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 10,378 | 10,089
90 days or more past due | Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 29,086 | 39,469
90 days or more past due | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,037 | 1,541
90 days or more past due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 26,312 | 31,077
90 days or more past due | Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 1,077 | 1,160
90 days or more past due | Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 18,724 | 20,615
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 153,950 | 166,082
Financial Asset, Past Due | Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 14,809 | 20,672
Financial Asset, Past Due | Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 30,856 | 40,686
Financial Asset, Past Due | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 2,577 | 1,666
Financial Asset, Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 58,341 | 55,584
Financial Asset, Past Due | Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 5,379 | 5,252
Financial Asset, Past Due | Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 41,988 | 42,222
Financial Asset, Not Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 37,778,663 | 35,319,694
Financial Asset, Not Past Due | Commercial real estate - owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 4,889,653 | 4,367,859
Financial Asset, Not Past Due | Commercial real estate - non-owner occupied |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 8,057,433 | 8,089,432
Financial Asset, Not Past Due | Construction and land development |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 3,386,874 | 3,697,655
Financial Asset, Not Past Due | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 15,512,580 | 13,760,233
Financial Asset, Not Past Due | Consumer and other |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | 601,001 | 532,255
Financial Asset, Not Past Due | Residential Mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,331,122 | $ 4,872,260

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