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Loans Held for Investment and Allowance for Credit Losses on Loans - Age Analysis of Loans Held for Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | $ 6,827,772 | $ 6,169,442
Accruing Loans 90 Days or More Past Due | 3,167 | 4,964
Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 896,202 | 775,554
Accruing Loans 90 Days or More Past Due | 339 | 18
Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 1,230,074 | 1,095,324
Accruing Loans 90 Days or More Past Due | 36 |
Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 473,631 | 415,466
Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 311,168 | 254,524
Accruing Loans 90 Days or More Past Due | 366 |
Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 1,097,710 | 937,006
Accruing Loans 90 Days or More Past Due | 365 | 1,704
Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 188,508 | 161,018
Accruing Loans 90 Days or More Past Due | 83 | 431
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 256,821 | 272,179
Accruing Loans 90 Days or More Past Due | 92 | 139
Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 1,429,401 | 1,416,093
Accruing Loans 90 Days or More Past Due | 667 | 2,418
Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 431,913 | 413,370
Accruing Loans 90 Days or More Past Due | 565 | 254
Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Loans | 512,344 | 428,908
Accruing Loans 90 Days or More Past Due | 654 |
30 to 59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 13,238 | 19,966
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,518 | 2,046
30 to 59 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 525 | 7,244
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 224 | 136
30 to 59 Days Past Due [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 245 | 2,264
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,918 | 3,351
30 to 59 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 136 | 293
30 to 59 Days Past Due [Member] | Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 391 | 253
30 to 59 Days Past Due [Member] | Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,027 | 2,506
30 to 59 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,171 | 1,873
30 to 59 Days Past Due [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 83 |
60 to 89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 2,406 | 1,724
60 to 89 Days Past Due [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 64 | 223
60 to 89 Days Past Due [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 274 |
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 770 | 567
60 to 89 Days Past Due [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 155 | 30
60 to 89 Days Past Due [Member] | Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans |  | 37
60 to 89 Days Past Due [Member] | Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 307 | 546
60 to 89 Days Past Due [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 776 | 321
60 to 89 Days Past Due [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 60 |
90 Days and Greater [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 8,427 | 14,200
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 339 | 1,465
90 Days and Greater [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 36 |
90 Days and Greater [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 33 |
90 Days and Greater [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 469 |
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,158 | 2,817
90 Days and Greater [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 102 | 451
90 Days and Greater [Member] | Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 302 | 2,077
90 Days and Greater [Member] | Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,677 | 7,118
90 Days and Greater [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 657 | 272
90 Days and Greater [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 654 |
Past Due Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 24,071 | 35,890
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,921 | 3,734
Past Due Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 561 | 7,244
Past Due Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 531 | 136
Past Due Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 714 | 2,264
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 4,846 | 6,735
Past Due Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 393 | 774
Past Due Loans [Member] | Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 693 | 2,367
Past Due Loans [Member] | Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 7,011 | 10,170
Past Due Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 3,604 | 2,466
Past Due Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 797 |
Current Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 6,803,701 | 6,133,552
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 891,281 | 771,820
Current Loans [Member] | Real Estate [Member] | Commercial Real Estate Non-Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,229,513 | 1,088,080
Current Loans [Member] | Real Estate [Member] | Construction and Development Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 473,100 | 415,330
Current Loans [Member] | Real Estate [Member] | Construction Residential Real Estate Less than 60 Months [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 310,454 | 252,260
Current Loans [Member] | Real Estate [Member] | Residential Real Estate First Lien [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,092,864 | 930,271
Current Loans [Member] | Real Estate [Member] | Residential Real Estate All Other [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 188,115 | 160,244
Current Loans [Member] | Real Estate [Member] | Farmland [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 256,128 | 269,812
Current Loans [Member] | Commercial and Agricultural Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 1,422,390 | 1,405,923
Current Loans [Member] | Consumer Non-real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | 428,309 | 410,904
Current Loans [Member] | Oil and Gas [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due Loans | $ 511,547 | $ 428,908

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