Loans, Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 5,008	$ 4,126	$ 4,045	$ 4,046
Provision (credit) charged to expenses	16	54	1,189	(51)
Losses charged off	(44)	(95)	(365)	(159)
Recoveries	36	27	147	276
Balance, end of period	5,016	4,112	5,016	4,112
Commercial and industrial [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	633	451	456	400
Provision (credit) charged to expenses	72	46	231	97
Losses charged off	(14)	0	(14)	0
Recoveries	0	0	18	0
Balance, end of period	691	497	691	497
Commercial Secured By Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	3,574	2,858	2,924	2,745
Provision (credit) charged to expenses	(109)	(131)	811	(74)
Losses charged off	0	(7)	(270)	(7)
Recoveries	0	0	0	56
Balance, end of period	3,465	2,720	3,465	2,720
Residential Real Estate [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	629	693	528	767
Provision (credit) charged to expenses	68	107	99	(88)
Losses charged off	0	(35)	(3)	(68)
Recoveries	0	8	73	162
Balance, end of period	697	773	697	773
Consumer [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	129	77	99	87
Provision (credit) charged to expenses	(10)	9	31	(22)
Losses charged off	(3)	(10)	(15)	(10)
Recoveries	17	5	18	26
Balance, end of period	133	81	133	81
Agricultural [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	39	41	34	46
Provision (credit) charged to expenses	(13)	(3)	(8)	(8)
Losses charged off	0	0	0	0
Recoveries	0	0	0	0
Balance, end of period	26	38	26	38
Other [Member]
Allowance for loan losses [Roll Forward]
Balance, beginning of period	4	6	4	1
Provision (credit) charged to expenses	8	26	25	44
Losses charged off	(27)	(43)	(63)	(74)
Recoveries	19	14	38	32
Balance, end of period	$ 4	$ 3	$ 4	$ 3