Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 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	$ 810		$ 676
Collectively evaluated for impairment	12,869		12,208
Total	13,679	$ 13,304	12,884	$ 12,383	$ 11,941	$ 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	22		24
Collectively evaluated for impairment	1,069		1,081
Total	1,091	1,066	1,105	1,052	1,045	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	342		216
Collectively evaluated for impairment	4,299		3,899
Total	4,641	4,400	4,115	3,925	3,794	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	145		84
Collectively evaluated for impairment	4,567		4,180
Total	4,712	4,532	4,264	3,929	3,673	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	19		58
Total	19	36	58	49	44	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	119		120
Total	119	118	120	123	115	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	144		193
Collectively evaluated for impairment	1,205		1,161
Total	1,349	1,328	1,354	1,219	1,266	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	157		159
Collectively evaluated for impairment	712		593
Total	869	741	752	699	589	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	536		762
Total	536	539	762	751	767	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	343		354
Total	$ 343	$ 544	$ 354	$ 636	$ 648	$ 404