Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	$ 485	$ 510
Collectively evaluated for impairment	16,075	15,305
Total	16,560	15,815	$ 14,247	$ 13,845
Real Estate Loans [Member] | Residential [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	17	18
Collectively evaluated for impairment	1,150	1,156
Total	1,167	1,174	1,154	1,114
Real Estate Loans [Member] | Commercial [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	101	95
Collectively evaluated for impairment	6,582	6,121
Total	6,683	6,216	4,729	4,549
Real Estate Loans [Member] | Agricultural [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	12	83
Collectively evaluated for impairment	4,905	4,870
Total	4,917	4,953	4,878	5,022
Real Estate Loans [Member] | Construction [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	151	122
Total	151	122	56	43
Consumer [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	237	321
Total	237	321	117	112
Other Commercial Loans [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	170	170
Collectively evaluated for impairment	1,334	1,056
Total	1,504	1,226	1,297	1,255
Other Agricultural Loans [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	185	144
Collectively evaluated for impairment	604	720
Total	789	864	835	961
State and Political Subdivision Loans [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	470	479
Total	470	479	558	536
Unallocated [Member]
Summary of allowance for loan losses into amount required for loans individually evaluated for impairment and the amount required for loans collectively evaluated for impairment [Abstract]
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	642	460
Total	$ 642	$ 460	$ 623	$ 253