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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 96,920 | $ 86,935 | $ 92,728 | $ 83,936
Initial allowance on loans purchased with credit deterioration |  | (7) |  | 71
Charge- offs | (1,730) | (451) | (3,012) | (1,688)
Recoveries | 274 | 531 | 602 | 1,252
Net charge-offs | (1,456) | 80 | (2,410) | (436)
Provision for/(benefit from) credit losses | 2,312 | 2,863 | 7,458 | 6,300
Balance at end of period | 97,776 | 89,871 | 97,776 | 89,871
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,808 | 6,928 | 6,416 | 7,550
Charge- offs | (805) |  | (853) | (20)
Recoveries | 3 | 426 | 55 | 504
Net charge-offs | (802) | 426 | (798) | 484
Provision for/(benefit from) credit losses | 809 | (231) | 1,197 | (911)
Balance at end of period | 6,815 | 7,123 | 6,815 | 7,123
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 33,432 | 16,315 | 30,190 | 16,807
Charge- offs |  |  | (3) |
Net charge-offs |  |  | (3) |
Provision for/(benefit from) credit losses | 1,182 | 7,371 | 4,427 | 6,879
Balance at end of period | 34,614 | 23,686 | 34,614 | 23,686
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,440 | 3,680 | 3,778 | 3,454
Charge- offs |  |  | (4) |
Recoveries | 3 | 3 | 9 | 8
Net charge-offs | 3 | 3 | 5 | 8
Provision for/(benefit from) credit losses | 467 | 461 | 127 | 682
Balance at end of period | 3,910 | 4,144 | 3,910 | 4,144
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 | 3,553 | 1,183 | 3,275 | 1,051
Provision for/(benefit from) credit losses | (9) | 1,124 | 269 | 1,256
Balance at end of period | 3,544 | 2,307 | 3,544 | 2,307
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,755 | 3,355 | 4,092 | 3,048
Initial allowance on loans purchased with credit deterioration |  |  |  | 2
Charge- offs | (100) | (11) | (144) | (60)
Recoveries |  | 15 | 13 | 28
Net charge-offs | (100) | 4 | (131) | (32)
Provision for/(benefit from) credit losses | 109 | (18) | 803 | 323
Balance at end of period | 4,764 | 3,341 | 4,764 | 3,341
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 1,661 | 1,480 | 1,418 | 1,567
Charge- offs |  | (2) | (28) | (38)
Recoveries | 1 | 1 | 4 | 403
Net charge-offs | 1 | (1) | (24) | 365
Provision for/(benefit from) credit losses | 3 | 84 | 271 | (369)
Balance at end of period | 1,665 | 1,563 | 1,665 | 1,563
Commercial Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 25,127 | 25,370 | 25,106 | 25,565
Initial allowance on loans purchased with credit deterioration |  | (4) |  | 44
Charge- offs | (239) | (187) | (517) | (961)
Recoveries | 243 | 26 | 392 | 162
Net charge-offs | 4 | (161) | (125) | (799)
Provision for/(benefit from) credit losses | (886) | (251) | (736) | 144
Balance at end of period | 24,245 | 24,954 | 24,245 | 24,954
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,344 | 4,050 | 4,132 | 3,694
Initial allowance on loans purchased with credit deterioration |  | (3) |  | 25
Charge- offs | (427) | (171) | (965) | (404)
Recoveries | 24 | 59 | 116 | 139
Net charge-offs | (403) | (112) | (849) | (265)
Provision for/(benefit from) credit losses | 448 | 270 | 1,106 | 751
Balance at end of period | 4,389 | 4,205 | 4,389 | 4,205
Oil and Gas [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 7,374 | 16,618 | 8,104 | 12,808
Charge- offs |  |  | (2) |
Net charge-offs |  |  | (2) |
Provision for/(benefit from) credit losses | 23 | (6,576) | (705) | (2,766)
Balance at end of period | 7,397 | 10,042 | 7,397 | 10,042
Agriculture [Member] | Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,426 | 7,956 | 6,217 | 8,392
Charge- offs | (159) | (80) | (496) | (205)
Recoveries |  | 1 | 13 | 8
Net charge-offs | (159) | (79) | (483) | (197)
Provision for/(benefit from) credit losses | 166 | 629 | 699 | 311
Balance at end of period | $ 6,433 | $ 8,506 | $ 6,433 | $ 8,506

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