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Allowance for Loan Losses - Loan loss by the primary segments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Loans:
Individually evaluated for impairment	$ 826		$ 824
Collectively evaluated for impairment	919,335		881,882
Total loans	920,161		882,706
Allowance for loan losses:
Specific reserve allocation	86		92
General reserve allocation	9,613		9,187
Total allowance for loan losses	9,699	$ 9,334	9,279	$ 8,102	$ 8,107	$ 8,671
Commercial loans secured by non-owner occupied real estate
Loans:
Total loans	365,250		363,635
Real estate-residential mortgage
Loans:
Total loans	230,509		235,239
Consumer [Member]
Loans:
Total loans	17,010		18,255
Allocation for General Risk [Member]
Loans:
Individually evaluated for impairment	0
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	961		924
Total allowance for loan losses	961	925	924	797	782	863
Commercial
Loans:
Total loans	672,642		629,212
Commercial | Commercial
Loans:
Individually evaluated for impairment	818		816
Collectively evaluated for impairment	306,574		264,761
Total loans	307,392		265,577
Allowance for loan losses:
Specific reserve allocation	78		84
General reserve allocation	3,706		3,867
Total allowance for loan losses	3,784	3,860	3,951	2,538	2,614	3,057
Commercial | Commercial loans secured by non-owner occupied real estate
Loans:
Individually evaluated for impairment	8		8
Collectively evaluated for impairment	365,242		363,627
Total loans	365,250		363,635
Allowance for loan losses:
Specific reserve allocation	8		8
General reserve allocation	3,611		3,111
Total allowance for loan losses	3,619	3,288	3,119	3,425	3,373	3,389
Consumer
Loans:
Total loans	247,519		253,494
Consumer | Real estate-residential mortgage
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	230,509		235,239
Total loans	230,509		235,239
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,216		1,159
Total allowance for loan losses	1,216	1,141	1,159	1,218	1,213	1,235
Consumer | Consumer [Member]
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	17,010		18,255
Total loans	17,010		18,255
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	119		126
Total allowance for loan losses	$ 119	$ 120	$ 126	$ 124	$ 125	$ 127

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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