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Loans Held-for-Investment and Allowance for Credit Losses - Schedule of Allowance for Loan Losses by Portfolio Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | $ 26,381 | $ 22,817 | $ 24,892
Loans collectively evaluated for credit losses | 79,577 | 75,508 | 75,044
Total allowance for loan losses | 105,958 | 98,325 | 99,936
C&I [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 8,334 | 4,505 | 5,351
Loans collectively evaluated for credit losses | 10,003 | 10,931 | 11,424
Total allowance for loan losses | 18,337 | 15,436 | 16,775
Municipal [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 152 | 0 | 0
Loans collectively evaluated for credit losses | 186 | 200 | 197
Total allowance for loan losses | 338 | 200 | 197
Construction & Development [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 1,777 | 491 | 591
Loans collectively evaluated for credit losses | 21,155 | 19,370 | 19,756
Total allowance for loan losses | 22,932 | 19,861 | 20,347
Farm [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 237 | 450 | 989
Loans collectively evaluated for credit losses | 2,453 | 2,421 | 2,185
Total allowance for loan losses | 2,690 | 2,871 | 3,174
Non-Owner Occupied CRE [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 4,285 | 4,258 | 3,449
Loans collectively evaluated for credit losses | 10,912 | 10,406 | 10,451
Total allowance for loan losses | 15,197 | 14,664 | 13,900
Owner Occupied CRE [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 7,081 | 8,158 | 9,597
Loans collectively evaluated for credit losses | 14,323 | 13,255 | 13,322
Total allowance for loan losses | 21,404 | 21,413 | 22,919
Residential [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 3,993 | 3,660 | 3,017
Loans collectively evaluated for credit losses | 18,069 | 16,828 | 15,720
Total allowance for loan losses | 22,062 | 20,488 | 18,737
Auto [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 8 | 6 | 5
Loans collectively evaluated for credit losses | 1,590 | 1,180 | 1,106
Total allowance for loan losses | 1,598 | 1,186 | 1,111
Non-Auto [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 3 | 124 | 165
Loans collectively evaluated for credit losses | 462 | 429 | 386
Total allowance for loan losses | 465 | 553 | 551
Agriculture [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans individually evaluated for credit losses | 511 | 1,165 | 1,728
Loans collectively evaluated for credit losses | 424 | 488 | 497
Total allowance for loan losses | $ 935 | $ 1,653 | $ 2,225

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