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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 94,760 | $ 87,239 | $ 92,728 | $ 83,936
Initial allowance on loans purchased with credit deterioration |  |  |  | 78
Charge- offs | (850) | (915) | (1,282) | (1,237)
Recoveries | 186 | 110 | 328 | 721
Net charge-offs | (664) | (805) | (954) | (516)
Provision for/(benefit from) credit losses | 2,824 | 501 | 5,146 | 3,437
Balance at end of period | 96,920 | 86,935 | 96,920 | 86,935
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,547 | 8,262 | 6,416 | 7,550
Charge- offs |  | (4) | (48) | (20)
Recoveries | 3 | 30 | 52 | 78
Net charge-offs | 3 | 26 | 4 | 58
Provision for/(benefit from) credit losses | 258 | (1,360) | 388 | (680)
Balance at end of period | 6,808 | 6,928 | 6,808 | 6,928
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 32,120 | 16,348 | 30,190 | 16,807
Charge- offs |  |  | (3) |
Net charge-offs |  |  | (3) |
Provision for/(benefit from) credit losses | 1,312 | (33) | 3,245 | (492)
Balance at end of period | 33,432 | 16,315 | 33,432 | 16,315
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,608 | 3,272 | 3,778 | 3,454
Charge- offs | (2) |  | (4) |
Recoveries | 3 | 2 | 6 | 5
Net charge-offs | 1 | 2 | 2 | 5
Provision for/(benefit from) credit losses | (169) | 406 | (340) | 221
Balance at end of period | 3,440 | 3,680 | 3,440 | 3,680
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 | 3,226 | 1,103 | 3,275 | 1,051
Provision for/(benefit from) credit losses | 327 | 80 | 278 | 132
Balance at end of period | 3,553 | 1,183 | 3,553 | 1,183
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,454 | 3,394 | 4,092 | 3,048
Initial allowance on loans purchased with credit deterioration |  |  |  | 2
Charge- offs | (42) | (5) | (44) | (49)
Recoveries | 10 | 6 | 13 | 13
Net charge-offs | (32) | 1 | (31) | (36)
Provision for/(benefit from) credit losses | 333 | (40) | 694 | 341
Balance at end of period | 4,755 | 3,355 | 4,755 | 3,355
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 1,444 | 1,560 | 1,418 | 1,567
Charge- offs | (2) | (36) | (28) | (36)
Recoveries | 1 |  | 3 | 402
Net charge-offs | (1) | (36) | (25) | 366
Provision for/(benefit from) credit losses | 218 | (44) | 268 | (453)
Balance at end of period | 1,661 | 1,480 | 1,661 | 1,480
Commercial Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 25,079 | 25,163 | 25,106 | 25,565
Initial allowance on loans purchased with credit deterioration |  |  |  | 48
Charge- offs | (102) | (717) | (278) | (774)
Recoveries | 127 | 26 | 149 | 136
Net charge-offs | 25 | (691) | (129) | (638)
Provision for/(benefit from) credit losses | 23 | 898 | 150 | 395
Balance at end of period | 25,127 | 25,370 | 25,127 | 25,370
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,232 | 3,730 | 4,132 | 3,694
Initial allowance on loans purchased with credit deterioration |  |  |  | 28
Charge- offs | (398) | (153) | (538) | (233)
Recoveries | 35 | 42 | 92 | 80
Net charge-offs | (363) | (111) | (446) | (153)
Provision for/(benefit from) credit losses | 475 | 431 | 658 | 481
Balance at end of period | 4,344 | 4,050 | 4,344 | 4,050
Oil and Gas [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 7,782 | 16,389 | 8,104 | 12,808
Charge- offs | (2) |  | (2) |
Net charge-offs | (2) |  | (2) |
Provision for/(benefit from) credit losses | (406) | 229 | (728) | 3,810
Balance at end of period | 7,374 | 16,618 | 7,374 | 16,618
Agriculture [Member] | Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,268 | 8,018 | 6,217 | 8,392
Charge- offs | (302) |  | (337) | (125)
Recoveries | 7 | 4 | 13 | 7
Net charge-offs | (295) | 4 | (324) | (118)
Provision for/(benefit from) credit losses | 453 | (66) | 533 | (318)
Balance at end of period | $ 6,426 | $ 7,956 | $ 6,426 | $ 7,956

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