Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 3,150	$ 2,837	$ 3,129	$ 3,121
Provision charged to expenses	396	677	486	746
Losses charged off	(208)	(856)	(326)	(1,276)
Recoveries	35	221	84	288
Balance, end of period	3,373	2,879	3,373	2,879
Commercial and Industrial [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	247	131	244	129
Provision charged to expenses	74	41	74	42
Losses charged off	(49)	(11)	(49)	(11)
Recoveries	1	1	4	2
Balance, end of period	273	162	273	162
Commercial Secured By Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	1,868	1,640	1,908	1,990
Provision charged to expenses	320	552	285	515
Losses charged off	(117)	(633)	(140)	(946)
Recoveries	0	96	18	96
Balance, end of period	2,071	1,655	2,071	1,655
Residential Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	896	934	854	926
Provision charged to expenses	(1)	53	65	117
Losses charged off	(14)	(115)	(42)	(197)
Recoveries	4	42	8	68
Balance, end of period	885	914	885	914
Consumer [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	81	54	54	63
Provision charged to expenses	(12)	16	49	(13)
Losses charged off	(9)	(18)	(53)	(29)
Recoveries	20	10	30	41
Balance, end of period	80	62	80	62
Agricultural [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	56	77	66	11
Provision charged to expenses	6	6	(4)	72
Losses charged off	0	(67)	0	(67)
Recoveries	0	67	0	67
Balance, end of period	62	83	62	83
Other [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	2	1	3	2
Provision charged to expenses	9	9	17	13
Losses charged off	(19)	(12)	(42)	(26)
Recoveries	10	5	24	14
Balance, end of period	$ 2	$ 3	$ 2	$ 3