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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings per share
Net income, Basic	$ 9,478	$ 5,281
Average common shares outstanding - basic	7,210,952	7,379,438
Net income - basic	$ 1.31	$ 0.72
Net income, Diluted	$ 9,478	$ 5,281
Average common shares outstanding - diluted	7,246,016	7,405,703
Net income - diluted	$ 1.31	$ 0.71

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