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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic
Net income									$ 7,333	$ 6,168	$ 6,090
Weighted average common shares outstanding									3,614,302	3,621,216	3,624,037
Basic earnings per common shares	$ 0.51	$ 0.55	$ 0.51	$ 0.46	$ 0.37	$ 0.48	$ 0.45	$ 0.40	$ 2.03	$ 1.70	$ 1.68
Diluted
Net income									$ 7,333	$ 6,168	$ 6,090
Weighted average common shares outstanding									3,614,302	3,621,216	3,624,037
Plus dilutive stock options and restricted stock units									13,825	8,465	5,482
Weighted average common shares outstanding and potentially dilutive shares									3,628,127	3,629,681	3,629,519
Diluted earnings per common share	$ 0.50	$ 0.55	$ 0.51	$ 0.46	$ 0.37	$ 0.48	$ 0.45	$ 0.40	$ 2.02	$ 1.70	$ 1.68

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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