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Loans and Allowance for Credit Losses - Schedule of Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 17,188,817 | $ 17,005,937
90 Days Past Due & Accruing | 423 | 603
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 39,762 | 48,196
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 116,371 | 81,698
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 156,133 | 129,894
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 17,032,684 | 16,876,043
Consumer: |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 285,355 | 308,994
90 Days Past Due & Accruing | 423 | 529
Consumer: | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,502 | 3,576
Consumer: | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 748 | 1,016
Consumer: | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,250 | 4,592
Consumer: | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 282,105 | 304,402
Consumer: | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 173,020 | 181,675
90 Days Past Due & Accruing | 423 | 529
Consumer: | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,360 | 1,824
Consumer: | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 613 | 635
Consumer: | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,973 | 2,459
Consumer: | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 171,047 | 179,216
Consumer: | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 112,335 | 127,319
90 Days Past Due & Accruing | 0 | 0
Consumer: | Other consumer | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,142 | 1,752
Consumer: | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 135 | 381
Consumer: | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,277 | 2,133
Consumer: | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 111,058 | 125,186
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,368,321 | 13,391,531
90 Days Past Due & Accruing | 0 | 0
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,669 | 40,416
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 89,477 | 53,516
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 121,146 | 93,932
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,247,175 | 13,297,599
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,874,823 | 2,789,249
90 Days Past Due & Accruing | 0 | 0
Real Estate | Construction and development | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 283 | 332
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,285 | 10,530
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 9,568 | 10,862
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,865,255 | 2,778,387
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,617,849 | 2,689,946
90 Days Past Due & Accruing | 0 | 0
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,401 | 34,651
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,250 | 16,013
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 30,651 | 50,664
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,587,198 | 2,639,282
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,875,649 | 7,912,336
90 Days Past Due & Accruing | 0 | 0
Real Estate | Other commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,985 | 5,433
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 67,942 | 26,973
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 80,927 | 32,406
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,794,722 | 7,879,930
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,750,569 | 2,695,329
90 Days Past Due & Accruing | 0 | 74
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,591 | 3,928
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,143 | 27,163
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,734 | 31,091
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,718,835 | 2,664,238
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,397,388 | 2,434,175
90 Days Past Due & Accruing | 0 | 74
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,953 | 3,535
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,251 | 27,059
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 30,204 | 30,594
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,367,184 | 2,403,581
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 353,181 | 261,154
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 638 | 393
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 892 | 104
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,530 | 497
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 351,651 | 260,657
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 784,572 | 610,083
90 Days Past Due & Accruing | 0 | 0
Other | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 276
Other | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 3
Other | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3 | 279
Other | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 784,569 | $ 609,804

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