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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings per share
Net income, Basic	$ 7,148	$ 6,717	$ 20,704	$ 18,528
Average common shares outstanding, Basic	7,394,992	7,399,054	7,397,768	7,397,373
Earnings per share, Basic	$ 0.97	$ 0.91	$ 2.80	$ 2.50
Net income, Diluted	$ 7,148	$ 6,717	$ 20,704	$ 18,528
Average common shares outstanding, Diluted	7,394,992	7,399,054	7,397,768	7,397,373
Earnings per share, Diluted	$ 0.97	$ 0.91	$ 2.80	$ 2.50

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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