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Loans - Allowance for Credit Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Loans [Abstract]          
Balance at beginning of period $ 22,894 $ 22,081 $ 22,806 $ 21,699 $ 21,699
Charge-offs (74) (596) (152) (781)  
Recoveries 161 25 183 54  
Provision 578 599 722 1,137  
Balance at end of period 23,559 22,109 23,559 22,109 22,806
Residential [Member]          
Loans [Abstract]          
Charge-offs     0   0
Commercial [Member]          
Loans [Abstract]          
Charge-offs     0   (40)
Construction [Member]          
Loans [Abstract]          
Charge-offs     0   0
Real Estate Loans [Member] | Residential [Member]          
Loans [Abstract]          
Balance at beginning of period 2,741 3,213 3,112 1,940 1,940
Charge-offs 0 0 0 0  
Recoveries 0 0 12 0  
Provision (70) (151) (453) 1,122  
Balance at end of period 2,671 3,062 2,671 3,062 3,112
Real Estate Loans [Member] | Commercial [Member]          
Loans [Abstract]          
Balance at beginning of period 10,605 9,237 10,017 9,174 9,174
Charge-offs 0 0 0 (40)  
Recoveries 0 0 0 0  
Provision 401 661 989 764  
Balance at end of period 11,006 9,898 11,006 9,898 10,017
Real Estate Loans [Member] | Agricultural [Member]          
Loans [Abstract]          
Balance at beginning of period 4,513 4,350 4,841 3,529 3,529
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (102) 192 (430) 1,013  
Balance at end of period 4,411 4,542 4,411 4,542 4,841
Real Estate Loans [Member] | Construction [Member]          
Loans [Abstract]          
Balance at beginning of period 802 1,552 916 1,402 1,402
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 111 (279) (3) (129)  
Balance at end of period 913 1,273 913 1,273 916
Consumer [Member]          
Loans [Abstract]          
Balance at beginning of period 1,036 1,360 1,201 1,338 1,338
Charge-offs (7) (275) (20) (297)  
Recoveries 5 7 12 33  
Provision 157 27 (2) 45  
Balance at end of period 1,191 1,119 1,191 1,119 1,201
Other Commercial Loans [Member]          
Loans [Abstract]          
Balance at beginning of period 2,815 2,090 2,534 3,766 3,766
Charge-offs (67) (321) (132) (444) (491)
Recoveries 156 18 159 21  
Provision 133 206 476 (1,350)  
Balance at end of period 3,037 1,993 3,037 1,993 2,534
Other Agricultural Loans [Member]          
Loans [Abstract]          
Balance at beginning of period 223 137 115 133 133
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0  
Provision (33) (5) 75 (1)  
Balance at end of period 190 132 190 132 115
State and Political Subdivision Loans [Member]          
Loans [Abstract]          
Balance at beginning of period 154 57 55 61 61
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0  
Provision (48) (1) 51 (5)  
Balance at end of period 106 56 106 56 55
Unallocated [Member]          
Loans [Abstract]          
Balance at beginning of period 5 85 15 356 356
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision 29 (51) 19 (322)  
Balance at end of period $ 34 $ 34 $ 34 $ 34 $ 15