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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 86,935 | $ 83,963 | $ 83,936 | $ 91,366
Initial allowance on loans purchased with credit deterioration | (7) | 1,027 | 71 | 8,299
Charge- offs | (451) | (300) | (1,688) | (5,414)
Recoveries | 531 | 290 | 1,252 | 678
Net charge-offs | 80 | (10) | (436) | (4,736)
Provision for (benefit from) credit losses | 2,863 | 1,483 | 6,300 | (8,466)
Balance at end of period | 89,871 | 86,463 | 89,871 | 86,463
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 6,945 | 8,298 | 7,568 | 8,470
Initial allowance on loans purchased with credit deterioration |  | 93 |  | 1,080
Charge- offs |  | (3) | (20) | (3)
Recoveries | 426 | 72 | 504 | 73
Net charge-offs | 426 | 69 | 484 | 70
Provision for (benefit from) credit losses | (291) | 91 | (972) | (1,069)
Balance at end of period | 7,080 | 8,551 | 7,080 | 8,551
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 22,937 | 15,038 | 16,987 | 12,318
Initial allowance on loans purchased with credit deterioration |  | 191 |  | 824
Charge- offs |  | (7) |  | (803)
Recoveries |  | 67 |  | 67
Net charge-offs |  | 60 |  | (736)
Provision for (benefit from) credit losses | 988 | 46 | 6,938 | 2,929
Balance at end of period | 23,925 | 15,335 | 23,925 | 15,335
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,728 | 3,095 | 3,490 | 2,723
Initial allowance on loans purchased with credit deterioration |  |  |  | 173
Recoveries | 3 | 4 | 8 | 9
Net charge-offs | 3 | 4 | 8 | 9
Provision for (benefit from) credit losses | 449 | (417) | 682 | 611
Balance at end of period | 4,180 | 3,516 | 4,180 | 3,516
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 | 2,292 | 998 | 1,092 | 726
Provision for (benefit from) credit losses | 115 | (25) | 1,315 | 247
Balance at end of period | 2,407 | 973 | 2,407 | 973
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,383 | 2,921 | 3,076 | 2,822
Initial allowance on loans purchased with credit deterioration |  | 9 | 2 | 126
Charge- offs | (11) | (4) | (60) | (56)
Recoveries | 15 | 9 | 28 | 36
Net charge-offs | 4 | 5 | (32) | (20)
Provision for (benefit from) credit losses | (8) | (199) | 333 | 206
Balance at end of period | 3,379 | 3,134 | 3,379 | 3,134
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,051 | 1,963 | 2,104 | 2,236
Charge- offs | (2) |  | (38) | (46)
Recoveries | 1 | 46 | 403 | 50
Net charge-offs | (1) | 46 | 365 | 4
Provision for (benefit from) credit losses | 59 | 206 | (360) | (25)
Balance at end of period | 2,109 | 2,215 | 2,109 | 2,215
Commercial and Agricultural Non-Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 27,833 | 34,310 | 28,085 | 34,643
Initial allowance on loans purchased with credit deterioration | (4) | 952 | 44 | 5,663
Charge- offs | (267) | (219) | (1,166) | (3,817)
Recoveries | 27 | 43 | 170 | 195
Net charge-offs | (240) | (176) | (996) | (3,622)
Provision for (benefit from) credit losses | 545 | (489) | 1,001 | (2,087)
Balance at end of period | 28,134 | 34,597 | 28,134 | 34,597
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,094 | 3,481 | 3,734 | 3,542
Initial allowance on loans purchased with credit deterioration | (3) | 30 | 25 | 38
Charge- offs | (171) | (67) | (404) | (689)
Recoveries | 59 | 49 | 139 | 247
Net charge-offs | (112) | (18) | (265) | (442)
Provision for (benefit from) credit losses | 268 | 66 | 753 | 421
Balance at end of period | 4,247 | 3,559 | 4,247 | 3,559
Oil and Gas [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 9,307 | 10,132 | 12,978 | 20,733
Provision for (benefit from) credit losses | 839 | (3) | (2,832) | (10,598)
Balance at end of period | 10,146 | 10,135 | 10,146 | 10,135
Farmland [Member] | Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,365 | 3,727 | 4,822 | 3,153
Initial allowance on loans purchased with credit deterioration |  | (248) |  | 395
Recoveries |  |  |  | 1
Net charge-offs |  |  |  | 1
Provision for (benefit from) credit losses | (101) | 969 | (558) | (899)
Balance at end of period | $ 4,264 | $ 4,448 | $ 4,264 | $ 4,448

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