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Loans and Allowance for Credit Losses - Schedule of Categories of Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 17,188,817 | $ 17,005,937
Consumer: |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 285,355 | 308,994
Consumer: | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 173,020 | 181,675
Consumer: | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 112,335 | 127,319
Real Estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 13,368,321 | 13,391,531
Real Estate | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,874,823 | 2,789,249
Real Estate | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,617,849 | 2,689,946
Real Estate | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 7,875,649 | 7,912,336
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,750,569 | 2,695,329
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,397,388 | 2,434,175
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 353,181 | 261,154
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 784,572 | $ 610,083

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