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Loans - Summary of Activities in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Allowance for Loan Losses |  |  |
Balance at beginning of year | $ 25,826 | $ 25,024 | $ 25,024
Provision for (recovery of) credit losses - loans | 811 | (289) | 944
Charge Offs | (335) | (192) | (480)
Recoveries | 50 | 137 | 338
Balance at ending of year | 26,352 | 24,680 | 25,826
Consumer Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 3,543 | 3,581 | 3,581
Provision for (recovery of) credit losses - loans | 139 | (290) | (31)
Charge Offs |  | (10) | (13)
Recoveries | 1 | 4 | 6
Balance at ending of year | 3,683 | 3,285 | 3,543
Agricultural Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 895 | 312 | 312
Provision for (recovery of) credit losses - loans | (124) | 859 | 583
Balance at ending of year | 771 | 1,171 | 895
Agricultural [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 285 | 336 | 336
Provision for (recovery of) credit losses - loans | 12 | 41 | (52)
Recoveries | 9 |  | 1
Balance at ending of year | 306 | 377 | 285
Commercial Real Estate [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 16,560 | 17,400 | 17,400
Provision for (recovery of) credit losses - loans | 344 | (1,450) | (834)
Charge Offs |  |  | (15)
Recoveries | 3 | 3 | 9
Balance at ending of year | 16,907 | 15,953 | 16,560
Commercial and Industrial [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 2,969 | 1,766 | 1,766
Provision for (recovery of) credit losses - loans | 215 | 517 | 1,176
Charge Offs | (25) | (101) | (106)
Recoveries | 6 | 66 | 133
Balance at ending of year | 3,165 | 2,248 | 2,969
Consumer [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 1,012 | 1,302 | 1,302
Provision for (recovery of) credit losses - loans | 219 | (123) | (133)
Charge Offs | (310) | (81) | (346)
Recoveries | 31 | 64 | 189
Balance at ending of year | 952 | 1,162 | 1,012
Other [Member] |  |  |
Allowance for Loan Losses |  |  |
Balance at beginning of year | 562 | 327 | 327
Provision for (recovery of) credit losses - loans | 6 | 157 | 235
Balance at ending of year | $ 568 | $ 484 | $ 562

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