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Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Loans that are Individually Evaluated for Credit Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
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Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | $ 252,958 | $ 233,851 | $ 229,923
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 26,381 | 22,817 | 24,892
Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 26,334 | 15,454 | 9,696
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 30,060 | 46,484 | 53,682
Related Allowance on Collateral Dependent Loans | 7,303 | 10,260 | 11,946
Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 19,078 | 12,557 | 12,946
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 196,564 | 171,913 | 166,545
C&I [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 39,546 | 29,762 | 25,237
Municipal [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 9,300 | 409 | 373
Construction & Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 16,270 | 11,174 | 10,021
Farm [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 9,641 | 10,588 | 10,324
Non-Owner Occupied CRE [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 36,786 | 39,894 | 38,394
Owner Occupied CRE [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 72,582 | 79,470 | 86,775
Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 61,996 | 53,659 | 51,180
Auto [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 3,423 | 3,579 | 3,108
Non-Auto [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 975 | 1,105 | 1,273
Commercial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 48,846 | 30,171 | 25,610
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 8,486 | 4,505 | 5,351
Commercial [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 350 | 854 | 1,137
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 3,377 | 3,130 | 2,815
Related Allowance on Collateral Dependent Loans | 968 | 1,463 | 1,430
Commercial [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 7,518 | 3,042 | 3,921
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 45,119 | 26,187 | 21,658
Commercial [Member] | C&I [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 39,546 | 29,762 | 25,237
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 8,334 | 4,505 | 5,351
Commercial [Member] | C&I [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 350 | 854 | 1,137
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 3,360 | 3,130 | 2,815
Related Allowance on Collateral Dependent Loans | 968 | 1,463 | 1,430
Commercial [Member] | C&I [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 7,366 | 3,042 | 3,921
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 35,836 | 25,778 | 21,285
Commercial [Member] | Municipal [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 9,300 | 409 | 373
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 152 | 0 | 0
Commercial [Member] | Municipal [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 0 | 0 | 0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 17 | 0 | 0
Related Allowance on Collateral Dependent Loans | 0 | 0 | 0
Commercial [Member] | Municipal [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 152 | 0 | 0
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 9,283 | 409 | 373
Agriculture [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 2,439 | 4,211 | 3,238
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 511 | 1,165 | 1,728
Agriculture [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 273 | 743 | 278
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 1,586 | 466 | 1,810
Related Allowance on Collateral Dependent Loans | 283 | 220 | 1,092
Agriculture [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 228 | 945 | 636
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 580 | 3,002 | 1,150
Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 197,275 | 194,785 | 196,694
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 17,373 | 17,017 | 17,643
Real Estate [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 25,711 | 13,857 | 8,281
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 23,938 | 41,944 | 48,013
Related Allowance on Collateral Dependent Loans | 6,049 | 8,525 | 9,336
Real Estate [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 11,324 | 8,492 | 8,307
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 147,626 | 138,984 | 140,400
Real Estate [Member] | Construction & Development [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 16,270 | 11,174 | 10,021
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 1,777 | 491 | 591
Real Estate [Member] | Construction & Development [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 281 | 732 | 1,091
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 1,552 | 409 | 526
Related Allowance on Collateral Dependent Loans | 210 | 26 | 35
Real Estate [Member] | Construction & Development [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 1,567 | 465 | 556
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 14,437 | 10,033 | 8,404
Real Estate [Member] | Farm [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 9,641 | 10,588 | 10,324
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 237 | 450 | 989
Real Estate [Member] | Farm [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 4,498 | 412 | 412
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 238 | 3,764 | 4,326
Related Allowance on Collateral Dependent Loans | 6 | 23 | 546
Real Estate [Member] | Farm [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 231 | 427 | 443
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 4,905 | 6,412 | 5,586
Real Estate [Member] | Non-Owner Occupied CRE [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 36,786 | 39,894 | 38,394
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 4,285 | 4,258 | 3,449
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 1,306 | 6,668 | 2,234
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 1,190 | 4,394 | 10,553
Related Allowance on Collateral Dependent Loans | 425 | 1,406 | 1,402
Real Estate [Member] | Non-Owner Occupied CRE [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 3,860 | 2,852 | 2,047
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 34,290 | 28,832 | 25,607
Real Estate [Member] | Owner Occupied CRE [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 72,582 | 79,470 | 86,775
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 7,081 | 8,158 | 9,597
Real Estate [Member] | Owner Occupied CRE [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 15,818 | 2,186 | 402
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 12,657 | 27,888 | 29,009
Related Allowance on Collateral Dependent Loans | 4,389 | 5,727 | 6,709
Real Estate [Member] | Owner Occupied CRE [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 2,692 | 2,431 | 2,888
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 44,107 | 49,396 | 57,364
Real Estate [Member] | Residential [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 61,996 | 53,659 | 51,180
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 3,993 | 3,660 | 3,017
Real Estate [Member] | Residential [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 3,808 | 3,859 | 4,142
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 8,301 | 5,489 | 3,599
Related Allowance on Collateral Dependent Loans | 1,019 | 1,343 | 644
Real Estate [Member] | Residential [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 2,974 | 2,317 | 2,373
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 49,887 | 44,311 | 43,439
Consumer [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 4,398 | 4,684 | 4,381
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 11 | 130 | 170
Consumer [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 0 | 0 | 0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 1,159 | 944 | 1,044
Related Allowance on Collateral Dependent Loans | 3 | 52 | 88
Consumer [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 8 | 78 | 82
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 3,239 | 3,740 | 3,337
Consumer [Member] | Auto [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 3,423 | 3,579 | 3,108
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 8 | 6 | 5
Consumer [Member] | Auto [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 0 | 0 | 0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 955 | 638 | 546
Related Allowance on Collateral Dependent Loans | 2 | 1 | 1
Consumer [Member] | Auto [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 6 | 5 | 4
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | 2,468 | 2,941 | 2,562
Consumer [Member] | Non-Auto [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Loans Individually Evaluated for Credit Losses | 975 | 1,105 | 1,273
Total Allowance for Credit Losses on Loans Individually Evaluated for Credit Losses | 3 | 124 | 165
Consumer [Member] | Non-Auto [Member] | Collateral Pledged [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Financing Receivable, Individually Evaluated, without Allowance for Credit Loss | 0 | 0 | 0
Financing Receivable, Individually Evaluated, with Allowance for Credit Loss | 204 | 306 | 498
Related Allowance on Collateral Dependent Loans | 1 | 51 | 87
Consumer [Member] | Non-Auto [Member] | Uncollateralized [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related Allowance On Non Collateral Dependent Loans | 2 | 73 | 78
Non Collateral Dependent Loans Individually Evaluated for Credit Losses | $ 771 | $ 799 | $ 775

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