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Loans and Allowance for Loan Losses (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Commercial & Industrial [Member]
Summary of Impaired loan activity
With no related allowance recorded, Recorded Investment	$ 329		$ 329
With no related allowance recorded, Unpaid Principal Balance	329		329
With no related allowance recorded, Related Allowance
With no related allowance recorded, Average Recorded Investment	763		777
With no related allowance recorded, Interest Income Recognized	(9)		19
With a specific allowance recorded, Recorded Investment
With a specific allowance recorded, Unpaid Principal Balance
With a specific allowance recorded, Related Allowance
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Total Recorded Investment	329		329
Total Unpaid Principal Balance	329		329
Total Related Allowance
Total Average Recorded Investment	763		777
Total Interest Income Recognized	(9)		19
Commercial RE & Construction [Member]
Summary of Impaired loan activity
With no related allowance recorded, Recorded Investment	287		287		696
With no related allowance recorded, Unpaid Principal Balance	287	29	287	29	722
With no related allowance recorded, Related Allowance
With no related allowance recorded, Average Recorded Investment	336	754	336	757	756
With no related allowance recorded, Interest Income Recognized	5	7	17		34
With a specific allowance recorded, Recorded Investment					689
With a specific allowance recorded, Unpaid Principal Balance		(2)		(2)	689
With a specific allowance recorded, Related Allowance					146
With a specific allowance recorded, Average Recorded Investment		689		721	713
With a specific allowance recorded, Interest Income Recognized
Total Recorded Investment	287		287		1,385
Total Unpaid Principal Balance	287	27	287	27	1,411
Total Related Allowance					146
Total Average Recorded Investment	336	1,443	336	1,478	1,469
Total Interest Income Recognized	5	7	17		34
Agricultural & Farmland [Member]
Summary of Impaired loan activity
With no related allowance recorded, Recorded Investment
With no related allowance recorded, Unpaid Principal Balance
With no related allowance recorded, Related Allowance
With no related allowance recorded, Average Recorded Investment
With no related allowance recorded, Interest Income Recognized
With a specific allowance recorded, Recorded Investment
With a specific allowance recorded, Unpaid Principal Balance
With a specific allowance recorded, Related Allowance
With a specific allowance recorded, Average Recorded Investment
With a specific allowance recorded, Interest Income Recognized
Total Recorded Investment
Total Unpaid Principal Balance
Total Related Allowance
Total Average Recorded Investment
Total Interest Income Recognized
Residential Real Estate [Member]
Summary of Impaired loan activity
With no related allowance recorded, Recorded Investment	1,021		1,021		752
With no related allowance recorded, Unpaid Principal Balance	1,064	20	1,064	20	795
With no related allowance recorded, Related Allowance
With no related allowance recorded, Average Recorded Investment	1,733	535	1,745	539	1,460
With no related allowance recorded, Interest Income Recognized	16	5	57		67
With a specific allowance recorded, Recorded Investment	868		868		1,078
With a specific allowance recorded, Unpaid Principal Balance	894	20	894	20	1,097
With a specific allowance recorded, Related Allowance	77		77		178
With a specific allowance recorded, Average Recorded Investment	424	625	428	631	628
With a specific allowance recorded, Interest Income Recognized	5	7	15		25
Total Recorded Investment	1,889		1,889		1,830
Total Unpaid Principal Balance	1,958	40	1,958	40	1,892
Total Related Allowance	77		77		178
Total Average Recorded Investment	2,157	1,160	2,173	1,170	2,088
Total Interest Income Recognized	21	12	72		92
Consumer & Other [Member]
Summary of Impaired loan activity
With no related allowance recorded, Recorded Investment	97		97		110
With no related allowance recorded, Unpaid Principal Balance	97	7	97	7	110
With no related allowance recorded, Related Allowance
With no related allowance recorded, Average Recorded Investment	102	126	106	130	128
With no related allowance recorded, Interest Income Recognized	2	2	5		9
With a specific allowance recorded, Recorded Investment	80		80		87
With a specific allowance recorded, Unpaid Principal Balance	80	4	80	4	87
With a specific allowance recorded, Related Allowance	4		4		5
With a specific allowance recorded, Average Recorded Investment	90	92	92	95	91
With a specific allowance recorded, Interest Income Recognized	1	1	4		5
Total Recorded Investment	177		177		197
Total Unpaid Principal Balance	177	11	177	11	197
Total Related Allowance	4		4		5
Total Average Recorded Investment	192	218	198	$ 225	219
Total Interest Income Recognized	$ 3	$ 3	$ 9		$ 14

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