Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
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	$ 721	$ 676
Collectively evaluated for impairment	12,363	12,208
Total	13,084	12,884	$ 11,587	$ 11,190
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	23	24
Collectively evaluated for impairment	1,066	1,081
Total	1,089	1,105	1,077	1,049
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	310	216
Collectively evaluated for impairment	3,820	3,899
Total	4,130	4,115	4,006	3,867
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	83	84
Collectively evaluated for impairment	4,309	4,180
Total	4,392	4,264	3,340	3,143
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	32	58
Total	32	58	39	23
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	124	120
Total	124	120	123	124
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	146	193
Collectively evaluated for impairment	1,137	1,161
Total	1,283	1,354	1,273	1,272
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	159	159
Collectively evaluated for impairment	597	593
Total	756	752	532	492
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	565	762
Total	565	762	789	816
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	713	354
Total	$ 713	$ 354	$ 408	$ 404