Loans - Loan Portfolio and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Loans [Abstract]
Total loans	$ 2,387,696		$ 2,271,271
Allowance for credit losses - loans	(23,786)	$ (23,559)	(22,806)	$ (22,454)	$ (22,109)	$ (21,699)
Net loans	2,363,910		2,248,465
Residential [Member]
Loans [Abstract]
Total loans	283,082		288,664
Commercial [Member]
Loans [Abstract]
Total loans	1,276,050		1,218,514
Construction [Member]
Loans [Abstract]
Total loans	103,498		93,965
Real Estate Loans [Member] \| Residential [Member]
Loans [Abstract]
Total loans	336,190		340,972
Allowance for credit losses - loans	(2,607)	(2,671)	(3,112)	(3,210)	(3,062)	(1,940)
Real Estate Loans [Member] \| Commercial [Member]
Loans [Abstract]
Total loans	1,276,050		1,218,514
Allowance for credit losses - loans	(11,702)	(11,006)	(10,017)	(9,453)	(9,898)	(9,174)
Real Estate Loans [Member] \| Agricultural [Member]
Loans [Abstract]
Total loans	370,505		347,448
Allowance for credit losses - loans	(4,685)	(4,411)	(4,841)	(4,804)	(4,542)	(3,529)
Real Estate Loans [Member] \| Construction [Member]
Loans [Abstract]
Total loans	103,498		93,965
Allowance for credit losses - loans	(1,021)	(913)	(916)	(967)	(1,273)	(1,402)
Consumer [Member]
Loans [Abstract]
Total loans	8,597		8,859
Allowance for credit losses - loans	(598)	(1,191)	(1,201)	(1,325)	(1,119)	(1,338)
Other Commercial Loans [Member]
Loans [Abstract]
Total loans	178,977		179,166
Allowance for credit losses - loans	(2,645)	(3,037)	(2,534)	(2,431)	(1,993)	(3,766)
Other Agricultural Loans [Member]
Loans [Abstract]
Total loans	31,323		30,247
Allowance for credit losses - loans	(218)	(190)	(115)	(125)	(132)	(133)
State and Political Subdivision Loans [Member]
Loans [Abstract]
Total loans	82,556		52,100
Allowance for credit losses - loans	$ (121)	$ (106)	$ (55)	$ (58)	$ (56)	$ (61)