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Summary of significant accounting policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per share
Net income, Basic	$ 25,736	$ 24,920	$ 18,457
Average common shares outstanding, Basic	7,395,429	7,397,797	7,395,837
Earnings per share, Basic	$ 3.48	$ 3.37	$ 2.50
Diluted earnings per share
Net income, Diluted	$ 25,736	$ 24,920	$ 18,457
Average common shares outstanding, Diluted	7,395,429	7,397,797	7,395,837
Earnings per share, Diluted	$ 3.48	$ 3.37	$ 2.50

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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