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Allowance for Loan Losses - Loan loss by the primary segments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans:
Individually evaluated for impairment	$ 2,206		$ 855
Collectively evaluated for impairment	993,823		971,240
Total loans	996,029		972,095
Allowance for loan losses:
Specific reserve allocation	607		104
General reserve allocation	11,517		11,241
Total allowance for loan losses	12,124	$ 11,752	11,345	$ 10,284	$ 9,699	$ 9,279
Commercial loans secured by non-owner occupied real estate
Loans:
Total loans	432,529		400,751
Real estate-residential mortgage
Loans:
Total loans	281,711		249,989
Consumer.
Loans:
Total loans	15,610		16,363
Allocation for general risk
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,208		1,093
Total allowance for loan losses	1,208	1,172	1,093	1,013	961	924
Commercial
Loans:
Total loans	698,708		705,743
Commercial | Commercial.
Loans:
Individually evaluated for impairment	2,200		847
Collectively evaluated for impairment	263,979		304,145
Total loans	266,179		304,992
Allowance for loan losses:
Specific reserve allocation	601		96
General reserve allocation	2,523		3,376
Total allowance for loan losses	3,124	3,534	3,472	3,036	3,784	3,951
Commercial | Commercial loans secured by non-owner occupied real estate
Loans:
Individually evaluated for impairment	6		8
Collectively evaluated for impairment	432,523		400,743
Total loans	432,529		400,751
Allowance for loan losses:
Specific reserve allocation	6		8
General reserve allocation	6,212		5,365
Total allowance for loan losses	6,218	5,535	5,373	4,890	3,619	3,119
Consumer
Loans:
Total loans	297,321		266,352
Consumer | Real estate-residential mortgage
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	281,711		249,989
Total loans	281,711		249,989
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,457		1,292
Total allowance for loan losses	1,457	1,388	1,292	1,225	1,216	1,159
Consumer | Consumer.
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	15,610		16,363
Total loans	15,610		16,363
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	117		115
Total allowance for loan losses	$ 117	$ 123	$ 115	$ 120	$ 119	$ 126

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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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