Loans - Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Loans [Abstract]
Balance at beginning of period	$ 22,806	$ 21,699	$ 21,699
Charge-offs	(78)	(185)
Recoveries	22	29
Provision	144	538
Balance at end of period	22,894	22,081	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	3,112	1,940	1,940
Charge-offs	0	0
Recoveries	12	0
Provision	(383)	1,273
Balance at end of period	2,741	3,213	3,112
Real Estate Loans [Member] | Commercial [Member]
Loans [Abstract]
Balance at beginning of period	10,017	9,174	9,174
Charge-offs	0	(40)
Recoveries	0	0
Provision	588	103
Balance at end of period	10,605	9,237	10,017
Real Estate Loans [Member] | Agricultural [Member]
Loans [Abstract]
Balance at beginning of period	4,841	3,529	3,529
Charge-offs	0	0
Recoveries	0	0
Provision	(328)	821
Balance at end of period	4,513	4,350	4,841
Real Estate Loans [Member] | Construction [Member]
Loans [Abstract]
Balance at beginning of period	916	1,402	1,402
Charge-offs	0	0
Recoveries	0	0
Provision	(114)	150
Balance at end of period	802	1,552	916
Consumer [Member]
Loans [Abstract]
Balance at beginning of period	1,201	1,405	1,405
Charge-offs	(13)	(22)
Recoveries	7	26
Provision	(159)	9
Balance at end of period	1,036	1,418	1,201
Other Commercial Loans [Member]
Loans [Abstract]
Balance at beginning of period	2,534	3,699	3,699
Charge-offs	(65)	(123)	(491)
Recoveries	3	3
Provision	343	(1,547)
Balance at end of period	2,815	2,032	2,534
Other Agricultural Loans [Member]
Loans [Abstract]
Balance at beginning of period	115	133	133
Charge-offs	0	0	0
Recoveries	0	0
Provision	108	4
Balance at end of period	223	137	115
State and Political Subdivision Loans [Member]
Loans [Abstract]
Balance at beginning of period	55	61	61
Charge-offs	0	0	0
Recoveries	0	0
Provision	99	(4)
Balance at end of period	154	57	55
Unallocated [Member]
Loans [Abstract]
Balance at beginning of period	15	356	356
Charge-offs	0	0
Recoveries	0	0
Provision	(10)	(271)
Balance at end of period	$ 5	$ 85	$ 15