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Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded	$ 1,331	$ 1,627	$ 961
Unpaid Principal Balance with no related allowance recorded	1,923	1,656	972
Average Recorded Investment with no related allowance recorded	1,404	1,279	1,018
Interest Income Recognized with no related allowance recorded	23	11	15
Recorded Investment with an allowance recorded	3,580	3,958	5,924
Unpaid Principal Balance with an allowance recorded	3,682	4,463	7,000
Related Allowance	403	506	1,114
Average Recorded Investment with an allowance recorded	4,267	4,567	6,708
Interest Income Recognized with an allowance recorded	146	148	179
Recorded Investment	4,911	5,585	6,885
Unpaid Principal Balance	5,605	6,119	7,972
Average Recorded Investment	5,671	5,846	7,726
Interest Income Recognized	169	159	194
Agricultural [Member]
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded	482
Unpaid Principal Balance with no related allowance recorded	485
Average Recorded Investment with no related allowance recorded	220		90
Interest Income Recognized with no related allowance recorded	13
Recorded Investment with an allowance recorded	44	50
Unpaid Principal Balance with an allowance recorded	44	50
Related Allowance	3	3
Average Recorded Investment with an allowance recorded	72	62	130
Interest Income Recognized with an allowance recorded	3	(6)
Recorded Investment	526	50
Unpaid Principal Balance	529	50
Average Recorded Investment	292	62	220
Interest Income Recognized	16	(6)
Commercial and Industrial [Member]
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded	206	74	38
Unpaid Principal Balance with no related allowance recorded	207	103	43
Average Recorded Investment with no related allowance recorded	91	25	81
Interest Income Recognized with no related allowance recorded	3
Recorded Investment with an allowance recorded	95	118
Unpaid Principal Balance with an allowance recorded	95	118
Related Allowance	11	15
Average Recorded Investment with an allowance recorded	218	44	292
Interest Income Recognized with an allowance recorded		1	4
Recorded Investment	301	192	38
Unpaid Principal Balance	302	221	43
Average Recorded Investment	309	69	373
Interest Income Recognized	3	1	4
Consumer [Member]
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded			8
Unpaid Principal Balance with no related allowance recorded			8
Average Recorded Investment with no related allowance recorded	1	2	3
Recorded Investment with an allowance recorded	28	24	28
Unpaid Principal Balance with an allowance recorded	28	24	28
Related Allowance	2	1	4
Average Recorded Investment with an allowance recorded	24	34	31
Interest Income Recognized with an allowance recorded	2	3	3
Recorded Investment	28	24	36
Unpaid Principal Balance	28	24	36
Average Recorded Investment	25	36	34
Interest Income Recognized	2	3	3
Commercial Real Estate [Member]
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded	342	1,540	413
Unpaid Principal Balance with no related allowance recorded	939	1,540	419
Average Recorded Investment with no related allowance recorded	925	1,061	352
Interest Income Recognized with no related allowance recorded	2	11	6
Recorded Investment with an allowance recorded	731	1,250	3,440
Unpaid Principal Balance with an allowance recorded	804	1,755	4,498
Related Allowance	91	191	745
Average Recorded Investment with an allowance recorded	1,281	2,002	3,932
Interest Income Recognized with an allowance recorded	33	64	81
Recorded Investment	1,073	2,790	3,853
Unpaid Principal Balance	1,743	3,295	4,917
Average Recorded Investment	2,206	3,063	4,284
Interest Income Recognized	35	75	87
Residential Real Estate [Member]
Impaired and Restructured Loans with or without related allowance recorded
Recorded Investment with no related allowance recorded	301	13	502
Unpaid Principal Balance with no related allowance recorded	292	13	502
Average Recorded Investment with no related allowance recorded	167	191	492
Interest Income Recognized with no related allowance recorded	5		9
Recorded Investment with an allowance recorded	2,682	2,516	2,456
Unpaid Principal Balance with an allowance recorded	2,711	2,516	2,474
Related Allowance	296	296	365
Average Recorded Investment with an allowance recorded	2,672	2,425	2,323
Interest Income Recognized with an allowance recorded	108	86	91
Recorded Investment	2,983	2,529	2,958
Unpaid Principal Balance	3,003	2,529	2,976
Average Recorded Investment	2,839	2,616	2,815
Interest Income Recognized	$ 113	$ 86	$ 100

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