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Loans Held for Investment and Allowance for Credit Losses on Loans - Activity in Allowance for Credit Losses on Loans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | $ 92,728 | $ 83,936 |
Initial allowance on loans purchased with credit deterioration |  | 71 |
Charge- offs | (4,240) | (2,781) |
Recoveries | 854 | 1,426 |
Net charge-offs | (3,386) | (1,355) |
Provision for/(benefit from) credit losses | 7,458 | 10,076 | $ (8,690)
Balance at end of period | 96,800 | 92,728 | 83,936
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 6,416 | 7,550 |
Charge- offs | (922) | (20) |
Recoveries | 68 | 507 |
Net charge-offs | (854) | 487 |
Provision for/(benefit from) credit losses | 1,921 | (1,621) |
Balance at end of period | 7,483 | 6,416 | 7,550
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 30,190 | 16,807 |
Charge- offs | (3) |  |
Net charge-offs | (3) |  |
Provision for/(benefit from) credit losses | 2,893 | 13,383 |
Balance at end of period | 33,080 | 30,190 | 16,807
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 3,778 | 3,454 |
Charge- offs | (6) | (93) |
Recoveries | 11 | 12 |
Net charge-offs | 5 | (81) |
Provision for/(benefit from) credit losses | 167 | 405 |
Balance at end of period | 3,950 | 3,778 | 3,454
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 3,275 | 1,051 |
Charge- offs | (94) |  |
Net charge-offs | (94) |  |
Provision for/(benefit from) credit losses | 233 | 2,224 |
Balance at end of period | 3,414 | 3,275 | 1,051
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 4,092 | 3,048 |
Initial allowance on loans purchased with credit deterioration |  | 2 |
Charge- offs | (165) | (106) |
Recoveries | 15 | 87 |
Net charge-offs | (150) | (19) |
Provision for/(benefit from) credit losses | 972 | 1,061 |
Balance at end of period | 4,914 | 4,092 | 3,048
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 1,418 | 1,567 |
Charge- offs | (60) | (38) |
Recoveries | 5 | 405 |
Net charge-offs | (55) | 367 |
Provision for/(benefit from) credit losses | 283 | (516) |
Balance at end of period | 1,646 | 1,418 | 1,567
Commercial Non-real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 25,106 | 25,565 |
Initial allowance on loans purchased with credit deterioration |  | 44 |
Charge- offs | (1,085) | (1,551) |
Recoveries | 446 | 209 |
Net charge-offs | (639) | (1,342) |
Provision for/(benefit from) credit losses | (1,722) | 839 |
Balance at end of period | 22,745 | 25,106 | 25,565
Consumer Non-real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 4,132 | 3,694 |
Initial allowance on loans purchased with credit deterioration |  | 25 |
Charge- offs | (1,350) | (768) |
Recoveries | 182 | 193 |
Net charge-offs | (1,168) | (575) |
Provision for/(benefit from) credit losses | 1,437 | 988 |
Balance at end of period | 4,401 | 4,132 | 3,694
Oil and Gas [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 8,104 | 12,808 |
Charge- offs | (59) |  |
Net charge-offs | (59) |  |
Provision for/(benefit from) credit losses | 985 | (4,704) |
Balance at end of period | 9,030 | 8,104 | 12,808
Agriculture [Member] | Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 6,217 | 8,392 |
Charge- offs | (496) | (205) |
Recoveries | 127 | 13 |
Net charge-offs | (369) | (192) |
Provision for/(benefit from) credit losses | 289 | (1,983) |
Balance at end of period | $ 6,137 | $ 6,217 | $ 8,392

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