Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 5,016	$ 4,112	$ 4,045	$ 4,046
Provision (credit) charged to expenses	976	264	2,165	213
Losses charged off	(38)	(308)	(403)	(467)
Recoveries	20	99	167	375
Balance, end of period	5,974	4,167	5,974	4,167
Commercial and industrial [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	691	497	456	400
Provision (credit) charged to expenses	114	(50)	345	47
Losses charged off	0	(47)	(14)	(47)
Recoveries	0	0	18	0
Balance, end of period	805	400	805	400
Commercial Secured By Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	3,465	2,720	2,924	2,745
Provision (credit) charged to expenses	466	372	1,277	298
Losses charged off	0	0	(270)	(7)
Recoveries	0	0	0	56
Balance, end of period	3,931	3,092	3,931	3,092
Residential Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	697	773	528	767
Provision (credit) charged to expenses	353	(101)	452	(189)
Losses charged off	(3)	(204)	(6)	(272)
Recoveries	1	73	74	235
Balance, end of period	1,048	541	1,048	541
Consumer [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	133	81	99	87
Provision (credit) charged to expenses	32	10	63	(12)
Losses charged off	(5)	(5)	(20)	(15)
Recoveries	3	4	21	30
Balance, end of period	163	90	163	90
Agricultural [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	26	38	34	46
Provision (credit) charged to expenses	(1)	1	(9)	(7)
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	25	39	25	39
Other [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	4	3	4	1
Provision (credit) charged to expenses	12	32	37	76
Losses charged off	(30)	(52)	(93)	(126)
Recoveries	16	22	54	54
Balance, end of period	$ 2	$ 5	$ 2	$ 5