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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | $ 26,352 | $ 24,680 | $ 25,826 | $ 25,024 | $ 25,024
Provision for (recovery of) credit losses - loans | 661 | 605 | 1,472 | 316 | 944
Charge Offs | (132) | (85) | (467) | (277) | (480)
Recoveries | 96 | 70 | 146 | 207 | 338
Balance at ending of year | 26,977 | 25,270 | 26,977 | 25,270 | 25,826
Consumer Real Estate [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 3,683 | 3,285 | 3,543 | 3,581 | 3,581
Provision for (recovery of) credit losses - loans | (31) | (82) | 108 | (372) | (31)
Charge Offs |  | (3) |  | (13) | (13)
Recoveries | 1 | 1 | 2 | 5 | 6
Balance at ending of year | 3,653 | 3,201 | 3,653 | 3,201 | 3,543
Agricultural Real Estate [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 771 | 1,171 | 895 | 312 | 312
Provision for (recovery of) credit losses - loans | (33) | (245) | (157) | 614 | 583
Balance at ending of year | 738 | 926 | 738 | 926 | 895
Agricultural [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 306 | 377 | 285 | 336 | 336
Provision for (recovery of) credit losses - loans | 27 | (92) | 39 | (51) | (52)
Recoveries | 1 |  | 10 |  | 1
Balance at ending of year | 334 | 285 | 334 | 285 | 285
Commercial Real Estate [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 16,907 | 15,953 | 16,560 | 17,400 | 17,400
Provision for (recovery of) credit losses - loans | 431 | 365 | 775 | (1,085) | (834)
Charge Offs |  |  |  |  | (15)
Recoveries | 16 | 1 | 19 | 4 | 9
Balance at ending of year | 17,354 | 16,319 | 17,354 | 16,319 | 16,560
Commercial and Industrial [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 3,165 | 2,248 | 2,969 | 1,766 | 1,766
Provision for (recovery of) credit losses - loans | 205 | 514 | 420 | 1,031 | 1,176
Charge Offs |  |  | (25) | (101) | (106)
Recoveries | 6 | 39 | 12 | 105 | 133
Balance at ending of year | 3,376 | 2,801 | 3,376 | 2,801 | 2,969
Consumer [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 952 | 1,162 | 1,012 | 1,302 | 1,302
Provision for (recovery of) credit losses - loans | 53 | 63 | 272 | (60) | (133)
Charge Offs | (132) | (82) | (442) | (163) | (346)
Recoveries | 72 | 29 | 103 | 93 | 189
Balance at ending of year | 945 | 1,172 | 945 | 1,172 | 1,012
Other [Member] |  |  |  |  |
Allowance for Loan Losses |  |  |  |  |
Balance at beginning of year | 568 | 484 | 562 | 327 | 327
Provision for (recovery of) credit losses - loans | 9 | 82 | 15 | 239 | 235
Balance at ending of year | $ 577 | $ 566 | $ 577 | $ 566 | $ 562

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