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Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | $ 8,278,247 | $ 8,025,110 | $ 8,180,361
Accruing Loans 90 Days or More Past Due | 7,959 | 7,739 |
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 937,976 | 931,709 |
Accruing Loans 90 Days or More Past Due | 3,505 | 569 |
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,703,037 | 1,578,483 |
Accruing Loans 90 Days or More Past Due | 0 | 41 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 661,882 | 756,662 |
Accruing Loans 90 Days or More Past Due | 248 | 116 |
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 249,539 | 250,373 |
Accruing Loans 90 Days or More Past Due | 82 |  |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,486,440 | 1,431,265 |
Accruing Loans 90 Days or More Past Due | 1,286 | 797 |
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 305,294 | 275,461 |
Accruing Loans 90 Days or More Past Due | 401 | 370 |
Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 445,530 | 449,190 |
Accruing Loans 90 Days or More Past Due | 457 | 4,754 |
Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,458,122 | 1,363,462 |
Accruing Loans 90 Days or More Past Due | 1,462 | 356 |
Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 493,900 | 478,647 |
Accruing Loans 90 Days or More Past Due | 518 | 504 |
Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 536,527 | 509,858 |
Accruing Loans 90 Days or More Past Due | 0 | 232 |
30 to 59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 18,646 | 25,401 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,982 | 2,810 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,225 | 603 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 91 | 317 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,028 | 292 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 6,370 | 9,128 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,943 | 1,498 |
30 to 59 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,005 | 1,569 |
30 to 59 Days Past Due [Member] | Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 2,256 | 4,325 |
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 2,646 | 3,748 |
30 to 59 Days Past Due [Member] | Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 100 | 1,111 |
60 to 89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 16,820 | 24,535 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 9,661 | 273 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,510 | 16,871 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 0 | 351 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 0 | 622 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,272 | 2,118 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 463 | 559 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,203 | 1,357 |
60 to 89 Days Past Due [Member] | Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,605 | 1,019 |
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,073 | 907 |
60 to 89 Days Past Due [Member] | Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 33 | 458 |
90 Days and Greater [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 46,981 | 46,755 |
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 8,984 | 7,963 |
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 18,529 | 610 |
90 Days and Greater [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,399 | 20,327 |
90 Days and Greater [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,028 | 616 |
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 3,473 | 3,332 |
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 556 | 828 |
90 Days and Greater [Member] | Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,503 | 5,691 |
90 Days and Greater [Member] | Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 8,894 | 5,983 |
90 Days and Greater [Member] | Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,203 | 1,173 |
90 Days and Greater [Member] | Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,412 | 232 |
Past Due Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 82,447 | 96,691 |
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 20,627 | 11,046 |
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 21,264 | 18,084 |
Past Due Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,490 | 20,995 |
Past Due Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 2,056 | 1,530 |
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 11,115 | 14,578 |
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 2,962 | 2,885 |
Past Due Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 3,711 | 8,617 |
Past Due Loans [Member] | Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 12,755 | 11,327 |
Past Due Loans [Member] | Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 4,922 | 5,828 |
Past Due Loans [Member] | Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,545 | 1,801 |
Current Loans [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 8,195,800 | 7,928,419 |
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 917,349 | 920,663 |
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,681,773 | 1,560,399 |
Current Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 660,392 | 735,667 |
Current Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 247,483 | 248,843 |
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,475,325 | 1,416,687 |
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 302,332 | 272,576 |
Current Loans [Member] | Real Estate [Member] | Agriculture [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 441,819 | 440,573 |
Current Loans [Member] | Commercial Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 1,445,367 | 1,352,135 |
Current Loans [Member] | Consumer Non-real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | 488,978 | 472,819 |
Current Loans [Member] | Oil and Gas [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Collateral Dependent Loans | $ 534,982 | $ 508,057 |

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