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Allowance for Loan Losses - Loan loss by the primary segments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Loans:
Individually evaluated for impairment	$ 867		$ 824
Collectively evaluated for impairment	940,913		881,882
Total loans	941,780		882,706
Allowance for loan losses:
Specific reserve allocation	106		92
General reserve allocation	10,178		9,187
Total allowance for loan losses	10,284	$ 9,699	9,279	$ 8,345	$ 8,102	$ 8,671
Commercial loans secured by non-owner occupied real estate
Loans:
Total loans	378,858
Allocation for General Risk [Member]
Loans:
Individually evaluated for impairment	0
Collectively evaluated for impairment	0
Total loans	0
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,013		924
Total allowance for loan losses	1,013	961	924	657	797	863
Commercial
Loans:
Total loans	690,773		629,212
Commercial | Commercial
Loans:
Individually evaluated for impairment	859		816
Collectively evaluated for impairment	311,056		264,761
Total loans	311,915		265,577
Allowance for loan losses:
Specific reserve allocation	98		84
General reserve allocation	2,938		3,867
Total allowance for loan losses	3,036	3,784	3,951	3,009	2,538	3,057
Commercial | Commercial loans secured by non-owner occupied real estate
Loans:
Individually evaluated for impairment	8		8
Collectively evaluated for impairment	378,850		363,627
Total loans	378,858		363,635
Allowance for loan losses:
Specific reserve allocation	8		8
General reserve allocation	4,882		3,111
Total allowance for loan losses	4,890	3,619	3,119	3,356	3,425	3,389
Consumer
Loans:
Total loans	251,007		253,494
Consumer | Real estate-residential mortgage
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	233,811		235,239
Total loans	233,811		235,239
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,225		1,159
Total allowance for loan losses	1,225	1,216	1,159	1,197	1,218	1,235
Consumer | Consumer [Member]
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	17,196		18,255
Total loans	17,196		18,255
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	120		126
Total allowance for loan losses	$ 120	$ 119	$ 126	$ 126	$ 124	$ 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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