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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings per share
Net income, Basic	$ 5,281	$ 6,412
Average common shares outstanding, Basic	7,379,438	7,399,054
Earnings per share, Basic	$ 0.72	$ 0.87
Net income, Diluted	$ 5,281	$ 6,412
Average common shares outstanding, Diluted	7,406,291	7,408,536
Earnings per share, Diluted	$ 0.71	$ 0.87

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