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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings per share
Net income, Basic	$ 8,312	$ 7,148	$ 21,169	$ 20,704
Average common shares outstanding, Basic	7,277,189	7,394,992	7,332,539	7,397,768
Earnings per share, Basic	$ 1.14	$ 0.97	$ 2.89	$ 2.80
Net income, Diluted	$ 8,312	$ 7,148	$ 21,169	$ 20,704
Average common shares outstanding, Diluted	7,312,253	7,417,403	7,364,693	7,412,865
Earnings per share, Diluted	$ 1.14	$ 0.96	$ 2.87	$ 2.79

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