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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings per share
Net Income, Basic	$ 6,717	$ 5,350	$ 18,528	$ 15,809
Average common shares outstanding, Basic	7,399,054	7,396,505	7,397,373	7,395,612
Earnings per share, Basic	$ 0.91	$ 0.72	$ 2.50	$ 2.14
Net Income, Diluted	$ 6,717	$ 5,350	$ 18,528	$ 15,809
Average common shares outstanding, Diluted	7,399,054	7,396,505	7,397,373	7,395,612
Earnings per share, Diluted	$ 0.91	$ 0.72	$ 2.50	$ 2.14

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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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