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Loans - Activity of Allowance for Credit Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | $ 22,109 | $ 22,797 | $ 21,699 | $ 21,153 | $ 21,153
Charge-offs | (20) | (1,212) | (801) | (2,568) |
Recoveries | 17 | 10 | 71 | 24 |
Provision | 348 | 100 | 1,485 | 3,086 |
Balance at end of period | 22,454 | 21,695 | 22,454 | 21,695 | 21,699
Residential [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Charge-offs |  |  | 0 |  | (5)
Commercial [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Charge-offs |  |  | (40) |  | 0
Construction [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Charge-offs |  |  | 0 |  | 0
Real Estate Loans [Member] | Residential [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 3,062 | 2,355 | 1,940 | 2,354 | 2,354
Charge-offs | 0 | (4) | 0 | (4) |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 148 | (365) | 1,270 | (364) |
Balance at end of period | 3,210 | 1,986 | 3,210 | 1,986 | 1,940
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 9,898 | 10,283 | 9,174 | 9,178 | 9,178
Charge-offs | 0 | 0 | (40) | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | (445) | (996) | 319 | 109 |
Balance at end of period | 9,453 | 9,287 | 9,453 | 9,287 | 9,174
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 4,542 | 3,770 | 3,529 | 3,264 | 3,264
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 262 | 45 | 1,275 | 551 |
Balance at end of period | 4,804 | 3,815 | 4,804 | 3,815 | 3,529
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 1,273 | 1,627 | 1,402 | 1,950 | 1,950
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | (306) | (156) | (435) | (479) |
Balance at end of period | 967 | 1,471 | 967 | 1,471 | 1,402
Consumer [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 1,119 | 1,008 | 1,338 | 1,412 | 1,412
Charge-offs | (10) | (25) | (307) | (62) |
Recoveries | 4 | 6 | 37 | 16 |
Provision | 212 | 174 | 257 | (203) |
Balance at end of period | 1,325 | 1,163 | 1,325 | 1,163 | 1,338
Other Commercial Loans [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 1,993 | 3,459 | 3,766 | 2,313 | 2,313
Charge-offs | (10) | (1,183) | (454) | (2,502) | (2,561)
Recoveries | 13 | 4 | 34 | 8 |
Provision | 435 | (252) | (915) | 2,209 |
Balance at end of period | 2,431 | 2,028 | 2,431 | 2,028 | 3,766
Other Agricultural Loans [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 132 | 206 | 133 | 270 | 270
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 |
Provision | (7) | (90) | (8) | (154) |
Balance at end of period | 125 | 116 | 125 | 116 | 133
State and Political Subdivision Loans [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 56 | 63 | 61 | 45 | 45
Charge-offs | 0 | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0 |
Provision | 2 | 0 | (3) | 18 |
Balance at end of period | 58 | 63 | 58 | 63 | 61
Unallocated [Member] |  |  |  |  |
Loans [Abstract] |  |  |  |  |
Balance at beginning of period | 34 | 26 | 356 | 367 | 367
Charge-offs | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Provision | 47 | 1,740 | (275) | 1,399 |
Balance at end of period | $ 81 | $ 1,766 | $ 81 | $ 1,766 | $ 356

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