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Loans - Loans and Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Jun. 29, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | ---
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | $ 20,938 |  |  | $ 19,796 |  |  |
Individually evaluated for impairment | 1,516 |  |  | 1,903 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 22,454 | $ 22,109 | $ 22,109 | 21,699 | $ 21,695 | $ 22,797 | $ 21,153
Collectively evaluated for impairment | 2,302,228 |  |  | 2,287,674 |  |  |
Individually evaluated for impairment | 33,160 |  |  | 25,568 |  |  |
Total Loans | 2,335,388 |  |  | 2,313,242 |  |  |
Consumer [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 402 |  |  | 324 |  |  |
Individually evaluated for impairment | 923 |  |  | 1,014 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 1,325 | 1,119 |  | 1,338 | 1,163 | 1,008 | 1,412
Collectively evaluated for impairment | 108,463 |  |  | 108,478 |  |  |
Individually evaluated for impairment | 995 |  |  | 1,027 |  |  |
Total Loans | 109,458 |  |  | 109,505 |  |  |
Other Commercial Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 2,007 |  |  | 3,019 |  |  |
Individually evaluated for impairment | 424 |  |  | 747 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 2,431 | 1,993 |  | 3,766 | 2,028 | 3,459 | 2,313
Collectively evaluated for impairment | 169,246 |  |  | 152,430 |  |  |
Individually evaluated for impairment | 2,099 |  |  | 2,582 |  |  |
Total Loans | 171,345 |  |  | 155,012 |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 125 |  |  | 133 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 125 | 132 |  | 133 | 116 | 206 | 270
Collectively evaluated for impairment | 26,739 |  |  | 29,125 |  |  |
Individually evaluated for impairment | 403 |  |  | 537 |  |  |
Total Loans | 27,142 |  |  | 29,662 |  |  |
State and Political Subdivision Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 58 |  |  | 61 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 58 | 56 |  | 61 | 63 | 63 | 45
Collectively evaluated for impairment | 51,644 |  |  | 54,182 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Loans | 51,644 |  |  | 54,182 |  |  |
Unallocated [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 81 |  |  | 356 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 81 | 34 |  | 356 | 1,766 | 26 | 367
Collectively evaluated for impairment | 0 |  |  | 0 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Loans | 0 |  |  | 0 |  |  |
Residential [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Total Loans | 293,365 |  |  | 301,735 |  |  |
Residential [Member] | Real Estate Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 3,142 |  |  | 1,902 |  |  |
Individually evaluated for impairment | 68 |  |  | 38 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 3,210 | 3,062 |  | 1,940 | 1,986 | 2,355 | 2,354
Collectively evaluated for impairment | 342,246 |  |  | 349,909 |  |  |
Individually evaluated for impairment | 2,544 |  |  | 1,489 |  |  |
Total Loans | 344,790 |  |  | 351,398 |  |  |
Commercial [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Total Loans | 1,180,655 |  |  | 1,121,435 |  |  |
Commercial [Member] | Real Estate Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 9,444 |  |  | 9,070 |  |  |
Individually evaluated for impairment | 9 |  |  | 104 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 9,453 | 9,898 |  | 9,174 | 9,287 | 10,283 | 9,178
Collectively evaluated for impairment | 1,157,239 |  |  | 1,105,847 |  |  |
Individually evaluated for impairment | 23,416 |  |  | 15,588 |  |  |
Total Loans | 1,180,655 |  |  | 1,121,435 |  |  |
Agricultural [Member] | Real Estate Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 4,804 |  |  | 3,529 |  |  |
Individually evaluated for impairment | 0 |  |  | 0 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 4,804 | 4,542 |  | 3,529 | 3,815 | 3,770 | 3,264
Collectively evaluated for impairment | 340,336 |  |  | 323,660 |  |  |
Individually evaluated for impairment | 2,151 |  |  | 4,062 |  |  |
Total Loans | 342,487 |  |  | 327,722 |  |  |
Construction [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Total Loans | 107,867 |  |  | 164,326 |  |  |
Construction [Member] | Real Estate Loans [Member] |  |  |  |  |  |  |
Loans [Abstract] |  |  |  |  |  |  |
Collectively evaluated for impairment | 875 |  |  | 1,402 |  |  |
Individually evaluated for impairment | 92 |  |  | 0 |  |  |
Total Allowance for Credit Losses - Loans for impairment | 967 | $ 1,273 |  | 1,402 | $ 1,471 | $ 1,627 | $ 1,950
Collectively evaluated for impairment | 106,315 |  |  | 164,043 |  |  |
Individually evaluated for impairment | 1,552 |  |  | 283 |  |  |
Total Loans | $ 107,867 |  |  | $ 164,326 |  |  |

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