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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings per share
Net income, Basic	$ 7,576	$ 7,144	$ 12,857	$ 13,556
Average common shares outstanding, Basic	7,341,636	7,399,302	7,360,517	7,399,178
Earnings per share, Basic	$ 1.03	$ 0.96	$ 1.75	$ 1.83
Net income, Diluted			$ 12,857	$ 13,556
Average common shares outstanding, Diluted	7,376,700	7,413,114	7,391,202	7,410,558
Earnings per share, Diluted	$ 1.03	$ 0.96	$ 1.74	$ 1.83

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