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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings per share
Net income, Basic	$ 6,412	$ 5,854
Average common shares outstanding, Basic	7,399,054	7,396,505
Earnings per share, Basic	$ 0.87	$ 0.79
Net income, Diluted	$ 6,412	$ 5,854
Average common shares outstanding, Diluted	7,399,054	7,396,505
Earnings per share, Diluted	$ 0.87	$ 0.79

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