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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
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | $ 83,936 | $ 91,366 |
Initial allowance on loans purchased with credit deterioration | 71 | 8,299 |
Charge- offs | (2,781) | (7,845) |
Recoveries | 1,426 | 806 |
Net charge-offs | (1,355) | (7,039) |
Provision for credit losses on loans | 10,076 | (8,690) | $ 62,648
Balance at end of period | 92,728 | 83,936 | 91,366
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 7,568 | 8,470 |
Initial allowance on loans purchased with credit deterioration |  | 1,080 |
Charge- offs | (20) | (38) |
Recoveries | 507 | 74 |
Net charge-offs | 487 | 36 |
Provision for credit losses on loans | (1,643) | (2,018) |
Balance at end of period | 6,412 | 7,568 | 8,470
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 16,987 | 12,318 |
Initial allowance on loans purchased with credit deterioration |  | 824 |
Charge- offs |  | (803) |
Recoveries |  | 67 |
Net charge-offs |  | (736) |
Provision for credit losses on loans | 13,205 | 4,581 |
Balance at end of period | 30,192 | 16,987 | 12,318
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 3,490 | 2,723 |
Initial allowance on loans purchased with credit deterioration |  | 173 |
Charge- offs | (93) |  |
Recoveries | 12 | 12 |
Net charge-offs | (81) | 12 |
Provision for credit losses on loans | 369 | 582 |
Balance at end of period | 3,778 | 3,490 | 2,723
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 | 1,092 | 726 |
Provision for credit losses on loans | 2,184 | 366 |
Balance at end of period | 3,276 | 1,092 | 726
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 3,076 | 2,822 |
Initial allowance on loans purchased with credit deterioration | 2 | 126 |
Charge- offs | (106) | (87) |
Recoveries | 87 | 55 |
Net charge-offs | (19) | (32) |
Provision for credit losses on loans | 1,039 | 160 |
Balance at end of period | 4,098 | 3,076 | 2,822
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 2,104 | 2,236 |
Charge- offs | (38) | (521) |
Recoveries | 405 | 52 |
Net charge-offs | 367 | (469) |
Provision for credit losses on loans | (626) | 337 |
Balance at end of period | 1,845 | 2,104 | 2,236
Commercial and Agricultural Non-Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 28,085 | 34,643 |
Initial allowance on loans purchased with credit deterioration | 44 | 5,663 |
Charge- offs | (1,756) | (4,643) |
Recoveries | 222 | 219 |
Net charge-offs | (1,534) | (4,424) |
Provision for credit losses on loans | 716 | (7,797) |
Balance at end of period | 27,311 | 28,085 | 34,643
Consumer Non-real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 3,734 | 3,542 |
Initial allowance on loans purchased with credit deterioration | 25 | 38 |
Charge- offs | (768) | (864) |
Recoveries | 193 | 326 |
Net charge-offs | (575) | (538) |
Provision for credit losses on loans | 951 | 692 |
Balance at end of period | 4,135 | 3,734 | 3,542
Oil and Gas [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 12,978 | 20,733 |
Provision for credit losses on loans | (4,807) | (7,755) |
Balance at end of period | 8,171 | 12,978 | 20,733
Farmland [Member] | Real Estate [Member] |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |
Balance at beginning of period | 4,822 | 3,153 |
Initial allowance on loans purchased with credit deterioration |  | 395 |
Charge- offs |  | (889) |
Recoveries |  | 1 |
Net charge-offs |  | (888) |
Provision for credit losses on loans | (1,312) | 2,162 |
Balance at end of period | $ 3,510 | $ 4,822 | $ 3,153

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