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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings per share
Net income, Basic	$ 7,144	$ 5,957	$ 13,556	$ 11,811
Average common shares outstanding, Basic	7,399,302	7,396,533	7,399,178	7,396,519
Earnings per share, Basic	$ 0.96	$ 0.81	$ 1.83	$ 1.60
Net income, Diluted	$ 7,144	$ 5,957	$ 13,556	$ 11,811
Average common shares outstanding, Diluted	7,399,302	7,396,533	7,399,178	7,396,519
Earnings per share, Diluted	$ 0.96	$ 0.81	$ 1.83	$ 1.60

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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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