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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 17,111,096 | $ 17,005,937
90 Days Past Due & Accruing | 709 | 603
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 37,540 | 48,196
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 131,992 | 81,698
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 169,532 | 129,894
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,941,564 | 16,876,043
Consumer: |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 299,997 | 308,994
90 Days Past Due & Accruing | 603 | 529
Consumer: | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,811 | 3,576
Consumer: | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 849 | 1,016
Consumer: | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,660 | 4,592
Consumer: | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 296,337 | 304,402
Consumer: | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 176,166 | 181,675
90 Days Past Due & Accruing | 603 | 529
Consumer: | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,916 | 1,824
Consumer: | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 667 | 635
Consumer: | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,583 | 2,459
Consumer: | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 173,583 | 179,216
Consumer: | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 123,831 | 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 | 895 | 1,752
Consumer: | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 182 | 381
Consumer: | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,077 | 2,133
Consumer: | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 122,754 | 125,186
Real Estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,371,707 | 13,391,531
90 Days Past Due & Accruing | 17 | 0
Real Estate | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 29,090 | 40,416
Real Estate | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 101,110 | 53,516
Real Estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 130,200 | 93,932
Real Estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,241,507 | 13,297,599
Real Estate | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,784,578 | 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 | 5,258 | 332
Real Estate | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 10,000 | 10,530
Real Estate | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,258 | 10,862
Real Estate | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,769,320 | 2,778,387
Real Estate | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,625,717 | 2,689,946
90 Days Past Due & Accruing | 17 | 0
Real Estate | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,154 | 34,651
Real Estate | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 18,391 | 16,013
Real Estate | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 36,545 | 50,664
Real Estate | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,589,172 | 2,639,282
Real Estate | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,961,412 | 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 | 5,678 | 5,433
Real Estate | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 72,719 | 26,973
Real Estate | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 78,397 | 32,406
Real Estate | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,883,015 | 7,879,930
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,773,585 | 2,695,329
90 Days Past Due & Accruing | 89 | 74
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5,639 | 3,928
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 30,030 | 27,163
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 35,669 | 31,091
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,737,916 | 2,664,238
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,440,507 | 2,434,175
90 Days Past Due & Accruing | 89 | 74
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,845 | 3,535
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 29,244 | 27,059
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 34,089 | 30,594
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,406,418 | 2,403,581
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 333,078 | 261,154
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 794 | 393
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 786 | 104
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,580 | 497
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 331,498 | 260,657
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 665,807 | 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 | $ 665,804 | $ 609,804

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