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Allowance for Loan Losses - Loan loss by the primary segments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Loans:
Individually evaluated for impairment	$ 829		$ 11
Collectively evaluated for impairment	868,304		862,271
Total loans	869,133		862,282
Allowance for loan losses:
Specific reserve allocation	96		11
General reserve allocation	8,249		8,660
Total allowance for loan losses	8,345	$ 8,102	8,671	$ 9,439	$ 9,521	$ 10,214
Commercial [Member]
Loans:
Individually evaluated for impairment	820		0
Collectively evaluated for impairment	244,943		250,184
Total loans	245,763		250,184
Allowance for loan losses:
Specific reserve allocation	87		0
General reserve allocation	2,922		3,057
Total allowance for loan losses	3,009	2,538	3,057	3,758	3,566	4,298
Commercial Loans Secured by Nonowner Occupied Real Estate[Member]
Loans:
Individually evaluated for impairment	9		11
Collectively evaluated for impairment	367,036		356,532
Total loans	367,045		356,543
Allowance for loan losses:
Specific reserve allocation	9		11
General reserve allocation	3,347		3,378
Total allowance for loan losses	3,356	3,425	3,389	3,388	3,686	3,666
Real estate - residential mortgage [Member]
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	238,140		237,964
Total loans	238,140		237,964
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	1,197		1,235
Total allowance for loan losses	1,197	1,218	1,235	1,239	1,253	1,102
Consumer [Member]
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	18,185		17,591
Total loans	18,185		17,591
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	126		127
Total allowance for loan losses	126	124	127	128	125	128
Allocation for General Risk [Member]
Loans:
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	0		0
Total loans	0		0
Allowance for loan losses:
Specific reserve allocation	0		0
General reserve allocation	657		863
Total allowance for loan losses	$ 657	$ 797	$ 863	$ 926	$ 891	$ 1,020

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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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