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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans, Excluding Loans Acquired, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 17,094,078 | $ 17,005,937
90 Days Past Due & Accruing | 494 | 603
Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 45,889 | 48,196
90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 106,791 | 81,698
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 152,680 | 129,894
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 16,941,398 | 16,876,043
Consumer: |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 276,878 | 308,994
90 Days Past Due & Accruing | 459 | 529
Consumer: | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,476 | 3,576
Consumer: | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 716 | 1,016
Consumer: | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,192 | 4,592
Consumer: | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 273,686 | 304,402
Consumer: | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 179,680 | 181,675
90 Days Past Due & Accruing | 459 | 529
Consumer: | Credit cards | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,628 | 1,824
Consumer: | Credit cards | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 580 | 635
Consumer: | Credit cards | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,208 | 2,459
Consumer: | Credit cards | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 177,472 | 179,216
Consumer: | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 97,198 | 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 | 848 | 1,752
Consumer: | Other consumer | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 136 | 381
Consumer: | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 984 | 2,133
Consumer: | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 96,214 | 125,186
Real Estate: |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,477,000 | 13,391,531
90 Days Past Due & Accruing | 8 | 0
Real Estate: | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 38,732 | 40,416
Real Estate: | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 78,980 | 53,516
Real Estate: | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 117,712 | 93,932
Real Estate: | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,359,288 | 13,297,599
Real Estate: | Construction and development |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,778,245 | 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 | 426 | 332
Real Estate: | Construction and development | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 12,933 | 10,530
Real Estate: | Construction and development | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 13,359 | 10,862
Real Estate: | Construction and development | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,764,886 | 2,778,387
Real Estate: | Single family residential |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,647,451 | 2,689,946
90 Days Past Due & Accruing | 8 | 0
Real Estate: | Single family residential | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 28,076 | 34,651
Real Estate: | Single family residential | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 15,531 | 16,013
Real Estate: | Single family residential | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 43,607 | 50,664
Real Estate: | Single family residential | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,603,844 | 2,639,282
Real Estate: | Other commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,051,304 | 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 | 10,230 | 5,433
Real Estate: | Other commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 50,516 | 26,973
Real Estate: | Other commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 60,746 | 32,406
Real Estate: | Other commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 7,990,558 | 7,879,930
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,637,150 | 2,695,329
90 Days Past Due & Accruing | 27 | 74
Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,681 | 3,928
Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 27,092 | 27,163
Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 31,773 | 31,091
Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,605,377 | 2,664,238
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,372,681 | 2,434,175
90 Days Past Due & Accruing | 27 | 74
Commercial | Commercial | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,496 | 3,535
Commercial | Commercial | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,367 | 27,059
Commercial | Commercial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 30,863 | 30,594
Commercial | Commercial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,341,818 | 2,403,581
Commercial | Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 264,469 | 261,154
90 Days Past Due & Accruing | 0 | 0
Commercial | Agricultural | Gross 30-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 185 | 393
Commercial | Agricultural | 90 Days or More Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 725 | 104
Commercial | Agricultural | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 910 | 497
Commercial | Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 263,559 | 260,657
Other |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 703,050 | 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 | $ 703,047 | $ 609,804

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