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Loans and Allowance for Credit Losses - Loan Portfolio by Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 17,094,078 | $ 17,005,937
Consumer: |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 276,878 | 308,994
Consumer: | Credit cards |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 179,680 | 181,675
Consumer: | Other consumer |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 97,198 | 127,319
Real Estate: |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 13,477,000 | 13,391,531
Real Estate: | Construction and development |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,778,245 | 2,789,249
Real Estate: | Single family residential |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,647,451 | 2,689,946
Real Estate: | Other commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 8,051,304 | 7,912,336
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,637,150 | 2,695,329
Commercial | Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 2,372,681 | 2,434,175
Commercial | Agricultural |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | 264,469 | 261,154
Other |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Loans | $ 703,050 | $ 610,083

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