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Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 37,932,613 |  | $ 35,485,776 |  |  |
Financing Receivable, Allowance for Credit Loss | (434,450) | $ (422,125) | (414,494) | $ (391,534) | $ (381,601) | $ (353,055)
Financing Receivable, after Allowance for Credit Loss | 37,498,163 |  | 35,071,282 |  |  |
Commercial real estate - owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,904,462 |  | 4,388,531 |  |  |
Financing Receivable, Allowance for Credit Loss | (40,190) | (37,070) | (36,997) | (31,700) | (29,847) | (28,690)
Commercial real estate - non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 8,088,289 |  | 8,130,118 |  |  |
Financing Receivable, Allowance for Credit Loss | (68,515) | (69,661) | (80,654) | (80,763) | (78,964) | (57,687)
Consumer real estate – mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | 4,914,482 |  |  |
Financing Receivable, Allowance for Credit Loss | (88,056) | (87,296) | (80,042) | (76,187) | (80,247) | (71,354)
Construction and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 3,389,451 |  | 3,699,321 |  |  |
Financing Receivable, Allowance for Credit Loss | (35,096) | (32,753) | (33,620) | (32,375) | (30,035) | (39,142)
Commercial and Industrial Portfolio Segment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 15,570,921 |  | 13,815,817 |  |  |
Financing Receivable, Allowance for Credit Loss | (192,454) | (187,020) | (174,799) | (162,371) | (154,014) | (148,212)
Consumer and other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 606,380 |  | 537,507 |  |  |
Financing Receivable, Allowance for Credit Loss | (10,139) | $ (8,325) | (8,382) | $ (8,138) | $ (8,494) | $ (7,970)
Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,373,110 |  | $ 4,914,482 |  |  |

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