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Loans - Financing Receivable Credit Exposures by Internally Assigned Grades, by Origination Year (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]          
Total Loans $ 2,335,388   $ 2,335,388   $ 2,313,242
Gross charge-offs 20 $ 1,212 801 $ 2,568  
Commercial Real Estate [Member]          
Loans [Abstract]          
2025/2024 73,928   73,928   52,207
2024/2023 64,110   64,110   86,332
2023/2022 111,917   111,917   384,368
2022/2021 380,563   380,563   205,586
2021/2020 184,599   184,599   116,840
Prior 328,599   328,599   243,887
Revolving Loans Amortized Cost Basis 34,930   34,930   30,028
Revolving Loans Converted to Term 2,009   2,009   2,187
Total Loans 1,180,655   1,180,655   1,121,435
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     40   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs     40   0
Commercial Real Estate [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 73,928   73,928   52,122
2024/2023 64,110   64,110   84,465
2023/2022 110,083   110,083   360,989
2022/2021 352,232   352,232   200,869
2021/2020 172,025   172,025   114,839
Prior 310,598   310,598   223,601
Revolving Loans Amortized Cost Basis 34,042   34,042   28,178
Revolving Loans Converted to Term 1,661   1,661   1,786
Total Loans 1,118,679   1,118,679   1,066,849
Commercial Real Estate [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   810
2023/2022 801   801   3,495
2022/2021 5,834   5,834   1,874
2021/2020 9,652   9,652   1,372
Prior 7,486   7,486   8,501
Revolving Loans Amortized Cost Basis 735   735   1,674
Revolving Loans Converted to Term 0   0   0
Total Loans 24,508   24,508   17,726
Commercial Real Estate [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 0   0   85
2024/2023 0   0   1,057
2023/2022 1,033   1,033   19,884
2022/2021 22,497   22,497   2,843
2021/2020 2,922   2,922   629
Prior 10,515   10,515   11,785
Revolving Loans Amortized Cost Basis 153   153   176
Revolving Loans Converted to Term 348   348   401
Total Loans 37,468   37,468   36,860
Commercial Real Estate [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
Agricultural Real Estate Loans [Member]          
Loans [Abstract]          
2025/2024 42,903   42,903   35,837
2024/2023 31,946   31,946   25,650
2023/2022 23,460   23,460   55,932
2022/2021 52,213   52,213   27,382
2021/2020 23,766   23,766   29,770
Prior 152,945   152,945   135,795
Revolving Loans Amortized Cost Basis 14,974   14,974   17,128
Revolving Loans Converted to Term 280   280   228
Total Loans 342,487   342,487   327,722
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs     0   0
Agricultural Real Estate Loans [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 42,153   42,153   32,199
2024/2023 31,229   31,229   22,372
2023/2022 20,155   20,155   46,644
2022/2021 49,577   49,577   26,132
2021/2020 22,740   22,740   29,770
Prior 147,094   147,094   126,876
Revolving Loans Amortized Cost Basis 12,770   12,770   14,351
Revolving Loans Converted to Term 202   202   115
Total Loans 325,920   325,920   298,459
Agricultural Real Estate Loans [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 86   86   2,930
2024/2023 41   41   3,138
2023/2022 3,305   3,305   7,109
2022/2021 582   582   0
2021/2020 354   354   0
Prior 1,331   1,331   5,315
Revolving Loans Amortized Cost Basis 1,558   1,558   2,248
Revolving Loans Converted to Term 0   0   0
Total Loans 7,257   7,257   20,740
Agricultural Real Estate Loans [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 664   664   708
2024/2023 676   676   140
2023/2022 0   0   2,179
2022/2021 2,054   2,054   1,250
2021/2020 672   672   0
Prior 4,520   4,520   3,604
Revolving Loans Amortized Cost Basis 646   646   529
Revolving Loans Converted to Term 78   78   113
Total Loans 9,310   9,310   8,523
Agricultural Real Estate Loans [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
Construction Loans [Member]          
Loans [Abstract]          
2025/2024 17,128   17,128   48,026
2024/2023 18,978   18,978   56,916
2023/2022 30,621   30,621   54,796
2022/2021 32,869   32,869   3,233
2021/2020 3,228   3,228   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 5,043   5,043   1,355
Revolving Loans Converted to Term 0   0   0
Total Loans 107,867   107,867   164,326
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs     0   0
Construction Loans [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 17,128   17,128   48,026
2024/2023 18,978   18,978   56,916
2023/2022 29,832   29,832   34,995
2022/2021 27,144   27,144   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 5,043   5,043   1,355
Revolving Loans Converted to Term 0   0   0
Total Loans 98,125   98,125   141,292
Construction Loans [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   19,391
2022/2021 207   207   2,950
2021/2020 2,945   2,945   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 3,152   3,152   22,341
Construction Loans [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 789   789   410
2022/2021 5,518   5,518   283
2021/2020 283   283   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 6,590   6,590   693
Construction Loans [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
Residential Real Estate [Member]          
Loans [Abstract]          
2025/2024 10,591   10,591   11,487
2024/2023 13,285   13,285   23,870
2023/2022 23,832   23,832   88,963
2022/2021 84,637   84,637   46,482
2021/2020 43,741   43,741   28,000
Prior 117,279   117,279   102,933
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 293,365   293,365   301,735
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   5
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs     0   5
Residential Real Estate [Member] | Performing [Member]          
Loans [Abstract]          
2025/2024 10,591   10,591   11,487
2024/2023 13,285   13,285   23,870
2023/2022 23,832   23,832   88,581
2022/2021 83,437   83,437   45,731
2021/2020 42,591   42,591   27,537
Prior 115,668   115,668   101,823
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 289,404   289,404   299,029
Residential Real Estate [Member] | Nonperforming [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   382
2022/2021 1,200   1,200   751
2021/2020 1,150   1,150   463
Prior 1,611   1,611   1,110
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 3,961   3,961   2,706
Home Equity [Member]          
Loans [Abstract]          
2025/2024 2,713   2,713   2,987
2024/2023 2,757   2,757   3,456
2023/2022 2,686   2,686   2,418
2022/2021 1,896   1,896   1,454
2021/2020 1,207   1,207   1,608
Prior 7,692   7,692   8,019
Revolving Loans Amortized Cost Basis 32,178   32,178   29,302
Revolving Loans Converted to Term 296   296   419
Total Loans 51,425   51,425   49,663
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs     0   0
Home Equity [Member] | Performing [Member]          
Loans [Abstract]          
2025/2024 2,713   2,713   2,987
2024/2023 2,757   2,757   3,456
2023/2022 2,686   2,686   2,418
2022/2021 1,896   1,896   1,454
2021/2020 1,204   1,204   1,525
Prior 7,630   7,630   7,937
Revolving Loans Amortized Cost Basis 32,178   32,178   29,302
Revolving Loans Converted to Term 296   296   419
Total Loans 51,360   51,360   49,498
Home Equity [Member] | Nonperforming [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 3   3   83
Prior 62   62   82
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 65   65   165
Consumer [Member]          
Loans [Abstract]          
2025/2024 2,216   2,216   2,076
2024/2023 1,209   1,209   887
2023/2022 513   513   589
2022/2021 388   388   543
2021/2020 436   436   323
Prior 3,477   3,477   3,516
Revolving Loans Amortized Cost Basis 101,218   101,218   101,570
Revolving Loans Converted to Term 1   1   1
Total Loans 109,458   109,458   109,505
2025/2024     0   0
2024/2023     0   13
2023/2022     9   27
2022/2021     1   0
2021/2020     0   0
Prior     275   38
Revolving Loans Amortized Cost Basis     22   29
Revolving Loans Converted to Term     0   0
Gross charge-offs     307   107
Consumer [Member] | Performing [Member]          
Loans [Abstract]          
2025/2024 2,216   2,216   2,076
2024/2023 1,209   1,209   880
2023/2022 511   511   589
2022/2021 388   388   543
2021/2020 425   425   317
Prior 2,698   2,698   2,520
Revolving Loans Amortized Cost Basis 101,218   101,218   101,570
Revolving Loans Converted to Term 1   1   1
Total Loans 108,666   108,666   108,496
Consumer [Member] | Nonperforming [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   7
2023/2022 2   2   0
2022/2021         0
2021/2020 11   11   6
Prior 779   779   996
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 792   792   1,009
Mortgage, Home Equity, and Consumer [Member]          
Loans [Abstract]          
2025/2024 15,520   15,520   16,550
2024/2023 17,251   17,251   28,213
2023/2022 27,031   27,031   91,970
2022/2021 86,921   86,921   48,479
2021/2020 45,384   45,384   29,931
Prior 128,448   128,448   114,468
Revolving Loans Amortized Cost Basis 133,396   133,396   154,574
Revolving Loans Converted to Term 297   297   420
Total Loans 454,248   454,248   460,903
Mortgage, Home Equity, and Consumer [Member] | Performing [Member]          
Loans [Abstract]          
2025/2024 15,520   15,520   16,550
2024/2023 17,251   17,251   28,206
2023/2022 27,029   27,029   91,588
2022/2021 85,721   85,721   47,728
2021/2020 44,220   44,220   29,379
Prior 125,997   125,997   112,280
Revolving Loans Amortized Cost Basis 133,396   133,396   130,872
Revolving Loans Converted to Term 297   297   420
Total Loans 449,431   449,431   457,023
Mortgage, Home Equity, and Consumer [Member] | Nonperforming [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   7
2023/2022 2   2   382
2022/2021 1,200   1,200   751
2021/2020 1,164   1,164   552
Prior 2,451   2,451   2,188
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 4,817   4,817   3,880
Commercial Portfolio Segment [Member]          
Loans [Abstract]          
2025/2024 23,614   23,614   33,444
2024/2023 28,899   28,899   22,808
2023/2022 18,772   18,772   8,766
2022/2021 7,108   7,108   7,720
2021/2020 6,129   6,129   2,446
Prior 4,947   4,947   4,161
Revolving Loans Amortized Cost Basis 80,171   80,171   73,883
Revolving Loans Converted to Term 1,705   1,705   1,784
Total Loans 171,345   171,345   155,012
2025/2024     0   0
2024/2023     49   0
2023/2022     0   59
2022/2021     0   0
2021/2020     0   0
Prior     63   0
Revolving Loans Amortized Cost Basis     342   2,502
Revolving Loans Converted to Term     0   0
Gross charge-offs 10 1,183 454 2,502 2,561
Commercial Portfolio Segment [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 23,614   23,614   33,211
2024/2023 28,770   28,770   22,808
2023/2022 18,772   18,772   6,773
2022/2021 5,306   5,306   7,542
2021/2020 6,085   6,085   2,150
Prior 4,220   4,220   3,464
Revolving Loans Amortized Cost Basis 75,561   75,561   68,573
Revolving Loans Converted to Term 76   76   75
Total Loans 162,404   162,404   144,596
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 0   0   20
2024/2023 0   0   0
2023/2022 0   0   1,798
2022/2021 1,802   1,802   178
2021/2020 5   5   62
Prior 0   0   56
Revolving Loans Amortized Cost Basis 4,139   4,139   4,888
Revolving Loans Converted to Term 0   0   32
Total Loans 5,946   5,946   7,034
Commercial Portfolio Segment [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 0   0   213
2024/2023 129   129   0
2023/2022 0   0   195
2022/2021 0   0   0
2021/2020 39   39   234
Prior 727   727   641
Revolving Loans Amortized Cost Basis 363   363   422
Revolving Loans Converted to Term 1,622   1,622   1,661
Total Loans 2,880   2,880   3,366
Commercial Portfolio Segment [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 108   108   0
Revolving Loans Converted to Term 7   7   16
Total Loans 115   115   16
Other Agricultural Loans [Member]          
Loans [Abstract]          
2025/2024 5,368   5,368   5,917
2024/2023 4,764   4,764   2,362
2023/2022 1,868   1,868   1,343
2022/2021 976   976   3,879
2021/2020 2,137   2,137   407
Prior 402   402   733
Revolving Loans Amortized Cost Basis 11,627   11,627   15,010
Revolving Loans Converted to Term         11
Total Loans 27,142   27,142   29,662
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs 0 0 0 0 0
Other Agricultural Loans [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 5,368   5,368   4,576
2024/2023 3,817   3,817   2,008
2023/2022 1,554   1,554   888
2022/2021 532   532   3,870
2021/2020 2,137   2,137   407
Prior 345   345   220
Revolving Loans Amortized Cost Basis 11,109   11,109   14,812
Revolving Loans Converted to Term 0   0   0
Total Loans 24,862   24,862   26,781
Other Agricultural Loans [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 0   0   1,341
2024/2023 947   947   0
2023/2022 17   17   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   400
Revolving Loans Amortized Cost Basis 288   288   67
Revolving Loans Converted to Term 0   0   0
Total Loans 1,252   1,252   1,808
Other Agricultural Loans [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   354
2023/2022 297   297   455
2022/2021 444   444   9
2021/2020 0   0   0
Prior 57   57   113
Revolving Loans Amortized Cost Basis 230   230   131
Revolving Loans Converted to Term 0   0   11
Total Loans 1,028   1,028   1,073
Other Agricultural Loans [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
State and political subdivision loans [Member]          
Loans [Abstract]          
2025/2024 58   58   0
2024/2023 28   28   1,442
2023/2022 1,309   1,309   13,460
2022/2021 12,775   12,775   10,522
2021/2020 10,076   10,076   5,319
Prior 27,072   27,072   23,439
Revolving Loans Amortized Cost Basis 326   326   0
Revolving Loans Converted to Term 0   0   0
Total Loans 51,644   51,644   54,182
2025/2024     0   0
2024/2023     0   0
2023/2022     0   0
2022/2021     0   0
2021/2020     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Gross charge-offs 0 $ 0 0 $ 0 0
State and political subdivision loans [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 58   58   0
2024/2023 28   28   1,442
2023/2022 1,309   1,309   13,460
2022/2021 12,775   12,775   10,522
2021/2020 10,076   10,076   5,319
Prior 27,072   27,072   23,439
Revolving Loans Amortized Cost Basis 326   326   0
Revolving Loans Converted to Term 0   0   0
Total Loans 51,644   51,644   54,182
State and political subdivision loans [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
State and political subdivision loans [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
State and political subdivision loans [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total Loans 0   0   0
Total Loans [Member]          
Loans [Abstract]          
2025/2024 162,999   162,999   175,431
2024/2023 148,725   148,725   195,510
2023/2022 187,947   187,947   518,665
2022/2021 486,504   486,504   258,322
2021/2020 229,935   229,935   154,782
Prior 513,965   513,965   408,015
Revolving Loans Amortized Cost Basis 147,071   147,071   137,404
Revolving Loans Converted to Term 3,994   3,994   4,210
Total Loans 1,881,140   1,881,140   1,852,339
Total Loans [Member] | Pass [Member]          
Loans [Abstract]          
2025/2024 162,249   162,249   170,134
2024/2023 146,932   146,932   190,011
2023/2022 181,705   181,705   463,749
2022/2021 447,566   447,566   248,935
2021/2020 213,063   213,063   152,485
Prior 489,329   489,329   377,600
Revolving Loans Amortized Cost Basis 138,851   138,851   127,269
Revolving Loans Converted to Term 1,939   1,939   1,976
Total Loans 1,781,634   1,781,634   1,732,159
Total Loans [Member] | Special Mention [Member]          
Loans [Abstract]          
2025/2024 86   86   4,291
2024/2023 988   988   3,948
2023/2022 4,123   4,123   31,793
2022/2021 8,425   8,425   5,002
2021/2020 12,956   12,956   1,434
Prior 8,817   8,817   14,272
Revolving Loans Amortized Cost Basis 6,720   6,720   8,877
Revolving Loans Converted to Term 0   0   32
Total Loans 42,115   42,115   69,649
Total Loans [Member] | Substandard [Member]          
Loans [Abstract]          
2025/2024 664   664   1,006
2024/2023 805   805   1,551
2023/2022 2,119   2,119   23,123
2022/2021 30,513   30,513   4,385
2021/2020 3,916   3,916   863
Prior 15,819   15,819   16,143
Revolving Loans Amortized Cost Basis 1,392   1,392   1,258
Revolving Loans Converted to Term 2,048   2,048   2,186
Total Loans 57,276   57,276   50,515
Total Loans [Member] | Doubtful [Member]          
Loans [Abstract]          
2025/2024 0   0   0
2024/2023 0   0   0
2023/2022 0   0   0
2022/2021 0   0   0
2021/2020 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 108   108   0
Revolving Loans Converted to Term 7   7   16
Total Loans $ 115   $ 115   $ 16