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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
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
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 |  | 78
Charge- offs | (432) | (322)
Recoveries | 142 | 611
Net charge-offs | (290) | 289
Provision for/(benefit from) credit losses | 2,322 | 2,936
Balance at end of period | 94,760 | 87,239
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 | (48) | (16)
Recoveries | 49 | 48
Net charge-offs | 1 | 32
Provision for/(benefit from) credit losses | 130 | 680
Balance at end of period | 6,547 | 8,262
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 | 1,933 | 459
Balance at end of period | 32,120 | 16,348
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 | (2) |
Recoveries | 3 | 3
Net charge-offs | 1 | 3
Provision for/(benefit from) credit losses | (171) | (185)
Balance at end of period | 3,608 | 3,272
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
Provision for/(benefit from) credit losses | (49) | 52
Balance at end of period | 3,226 | 1,103
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 | (2) | (44)
Recoveries | 3 | 7
Net charge-offs | 1 | (37)
Provision for/(benefit from) credit losses | 361 | 381
Balance at end of period | 4,454 | 3,394
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 | (26) |
Recoveries | 2 | 402
Net charge-offs | (24) | 402
Provision for/(benefit from) credit losses | 50 | (409)
Balance at end of period | 1,444 | 1,560
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 |  | 48
Charge- offs | (176) | (57)
Recoveries | 22 | 110
Net charge-offs | (154) | 53
Provision for/(benefit from) credit losses | 127 | (503)
Balance at end of period | 25,079 | 25,163
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 |  | 28
Charge- offs | (140) | (80)
Recoveries | 57 | 38
Net charge-offs | (83) | (42)
Provision for/(benefit from) credit losses | 183 | 50
Balance at end of period | 4,232 | 3,730
Oil and Gas [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Balance at beginning of period | 8,104 | 12,808
Provision for/(benefit from) credit losses | (322) | (3,581)
Balance at end of period | 7,782 | 16,389
Agriculture [Member] | Real Estate [Member] |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |
Balance at beginning of period | 6,217 | 8,392
Charge- offs | (35) | (125)
Recoveries | 6 | 3
Net charge-offs | (29) | (122)
Provision for/(benefit from) credit losses | 80 | (252)
Balance at end of period | $ 6,268 | $ 8,018

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