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Summary of significant accounting policies - Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings per share
Net income, Basic									$ 29,354	$ 25,736	$ 24,920
Average common shares outstanding - basic	7,222,810	7,277,189	7,341,636	7,379,438	7,388,488	7,394,992	7,399,302	7,379,438	7,304,956	7,395,429	7,397,797
Net income - basic	$ 1.13	$ 1.14	$ 1.03	$ 0.72	$ 0.68	$ 0.97	$ 0.96	$ 0.87	$ 4.02	$ 3.48	$ 3.37
Diluted earnings per share
Net income, Diluted									$ 29,354	$ 25,736	$ 24,920
Average common shares outstanding - diluted	7,257,874	7,312,253	7,376,700	7,405,703	7,410,899	7,417,403	7,413,114	7,408,536	7,337,843	7,412,369	7,402,900
Net income - diluted	$ 1.13	$ 1.13	$ 1.03	$ 0.71	$ 0.68	$ 0.96	$ 0.96	$ 0.87	$ 4.00	$ 3.47	$ 3.37

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- Definition

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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