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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