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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | $ 87,239 | $ 90,860 | $ 83,936 | $ 91,366
Initial allowance on loans purchased with credit deterioration |  | 7,272 | 78 | 7,272
Charge- offs | (915) | (4,448) | (1,237) | (5,114)
Recoveries | 110 | 228 | 721 | 388
Net charge-offs | (805) | (4,220) | (516) | (4,726)
Provision for (benefit from) credit losses | 501 | (9,949) | 3,437 | (9,949)
Balance at end of period | 86,935 | 83,963 | 86,935 | 83,963
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 8,281 | 6,505 | 7,568 | 8,470
Initial allowance on loans purchased with credit deterioration |  | 987 |  | 987
Charge- offs | (4) |  | (20) |
Recoveries | 30 | 1 | 78 | 1
Net charge-offs | 26 | 1 | 58 | 1
Provision for (benefit from) credit losses | (1,362) | 805 | (681) | (1,160)
Balance at end of period | 6,945 | 8,298 | 6,945 | 8,298
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 20,674 | 19,115 | 16,987 | 12,318
Initial allowance on loans purchased with credit deterioration |  | 633 |  | 633
Charge- offs |  | (758) |  | (796)
Net charge-offs |  | (758) |  | (796)
Provision for (benefit from) credit losses | 2,263 | (3,952) | 5,950 | 2,883
Balance at end of period | 22,937 | 15,038 | 22,937 | 15,038
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,309 | 2,943 | 3,490 | 2,723
Initial allowance on loans purchased with credit deterioration |  | 173 |  | 173
Recoveries | 2 | 2 | 5 | 5
Net charge-offs | 2 | 2 | 5 | 5
Provision for (benefit from) credit losses | 417 | (23) | 233 | 194
Balance at end of period | 3,728 | 3,095 | 3,728 | 3,095
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 | 2,164 | 1,092 | 1,092 | 726
Provision for (benefit from) credit losses | 128 | (94) | 1,200 | 272
Balance at end of period | 2,292 | 998 | 2,292 | 998
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,421 | 2,937 | 3,076 | 2,822
Initial allowance on loans purchased with credit deterioration |  | 117 | 2 | 117
Charge- offs | (5) | (9) | (49) | (52)
Recoveries | 6 | 12 | 13 | 27
Net charge-offs | 1 | 3 | (36) | (25)
Provision for (benefit from) credit losses | (39) | (136) | 341 | 7
Balance at end of period | 3,383 | 2,921 | 3,383 | 2,921
Real Estate [Member] | Residential Real Estate All Other [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 2,107 | 1,880 | 2,104 | 2,236
Charge- offs | (36) | (30) | (36) | (46)
Recoveries |  | 1 | 402 | 4
Net charge-offs | (36) | (29) | 366 | (42)
Provision for (benefit from) credit losses | (20) | 112 | (419) | (231)
Balance at end of period | 2,051 | 1,963 | 2,051 | 1,963
Commercial and Agricultural Non-Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 27,724 | 35,439 | 28,085 | 34,643
Initial allowance on loans purchased with credit deterioration |  | 4,711 | 48 | 4,711
Charge- offs | (717) | (3,442) | (899) | (3,598)
Recoveries | 30 | 125 | 143 | 152
Net charge-offs | (687) | (3,317) | (756) | (3,446)
Provision for (benefit from) credit losses | 796 | (2,523) | 456 | (1,598)
Balance at end of period | 27,833 | 34,310 | 27,833 | 34,310
Consumer Non-real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 3,771 | 3,421 | 3,734 | 3,542
Initial allowance on loans purchased with credit deterioration |  | 8 | 28 | 8
Charge- offs | (153) | (209) | (233) | (622)
Recoveries | 42 | 86 | 80 | 198
Net charge-offs | (111) | (123) | (153) | (424)
Provision for (benefit from) credit losses | 434 | 175 | 485 | 355
Balance at end of period | 4,094 | 3,481 | 4,094 | 3,481
Oil and Gas [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 11,405 | 14,440 | 12,978 | 20,733
Provision for (benefit from) credit losses | (2,098) | (4,308) | (3,671) | (10,601)
Balance at end of period | 9,307 | 10,132 | 9,307 | 10,132
Farmland [Member] | Real Estate [Member] |  |  |  |
Financing Receivable Allowance For Credit Losses [Line Items] |  |  |  |
Balance at beginning of period | 4,383 | 3,088 | 4,822 | 3,153
Initial allowance on loans purchased with credit deterioration |  | 643 |  | 643
Recoveries |  | 1 |  | 1
Net charge-offs |  | 1 |  | 1
Provision for (benefit from) credit losses | (18) | (5) | (457) | (70)
Balance at end of period | $ 4,365 | $ 3,727 | $ 4,365 | $ 3,727

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