Loans - Loans and Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans [Abstract]
Collectively evaluated for impairment	$ 21,032	$ 20,893
Individually evaluated for impairment	1,862	1,913
Total Allowance for Credit Losses - Loans for impairment	22,894	22,806	$ 22,081	$ 21,699
Collectively evaluated for impairment	2,259,400	2,311,682
Individually evaluated for impairment	38,822	38,940
Total Loans	2,298,222	2,350,622
Consumer [Member]
Loans [Abstract]
Collectively evaluated for impairment	114	327
Individually evaluated for impairment	922	874
Total Allowance for Credit Losses - Loans for impairment	1,036	1,201	1,418	1,405
Collectively evaluated for impairment	18,669	87,301
Individually evaluated for impairment	923	909
Total Loans	19,592	88,210
Other Commercial Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	2,285	1,903
Individually evaluated for impairment	530	631
Total Allowance for Credit Losses - Loans for impairment	2,815	2,534	2,032	3,699
Collectively evaluated for impairment	162,807	171,343
Individually evaluated for impairment	7,821	7,823
Total Loans	170,628	179,166
Other Agricultural Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	194	115
Individually evaluated for impairment	29	0
Total Allowance for Credit Losses - Loans for impairment	223	115	137	133
Collectively evaluated for impairment	29,504	29,844
Individually evaluated for impairment	500	403
Total Loans	30,004	30,247
State and Political Subdivision Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	154	55
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	154	55	57	61
Collectively evaluated for impairment	63,877	52,100
Individually evaluated for impairment	0	0
Total Loans	63,877	52,100
Unallocated [Member]
Loans [Abstract]
Collectively evaluated for impairment	5	15
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	5	15	85	356
Collectively evaluated for impairment	0	0
Individually evaluated for impairment	0	0
Total Loans	0	0
Residential [Member]
Loans [Abstract]
Total Loans	283,986	288,664
Residential [Member] | Real Estate Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	2,682	3,050
Individually evaluated for impairment	59	62
Total Allowance for Credit Losses - Loans for impairment	2,741	3,112	3,213	1,940
Collectively evaluated for impairment	333,300	338,600
Individually evaluated for impairment	2,766	2,372
Total Loans	336,066	340,972
Commercial [Member]
Loans [Abstract]
Total Loans	1,249,900	1,218,514
Commercial [Member] | Real Estate Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	10,364	9,757
Individually evaluated for impairment	241	260
Total Allowance for Credit Losses - Loans for impairment	10,605	10,017	9,237	9,174
Collectively evaluated for impairment	1,225,728	1,193,742
Individually evaluated for impairment	24,172	24,772
Total Loans	1,249,900	1,218,514
Agricultural [Member] | Real Estate Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	4,513	4,841
Individually evaluated for impairment	0	0
Total Allowance for Credit Losses - Loans for impairment	4,513	4,841	4,350	3,529
Collectively evaluated for impairment	342,801	345,302
Individually evaluated for impairment	2,137	2,146
Total Loans	344,938	347,448
Construction [Member]
Loans [Abstract]
Total Loans	83,217	93,965
Construction [Member] | Real Estate Loans [Member]
Loans [Abstract]
Collectively evaluated for impairment	721	830
Individually evaluated for impairment	81	86
Total Allowance for Credit Losses - Loans for impairment	802	916	$ 1,552	$ 1,402
Collectively evaluated for impairment	82,714	93,450
Individually evaluated for impairment	503	515
Total Loans	$ 83,217	$ 93,965