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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, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings per share
Net Income (Numerator), Basic	$ 19,583	$ 17,723	$ 17,649
Average common shares outstanding (Denominator), Basic	7,396,716	7,516,451	7,548,825
Earnings per share, Basic	$ 2.65	$ 2.36	$ 2.34
Net Income (Numerator), Diluted	$ 19,583	$ 17,723	$ 17,649
Average common shares outstanding (Denominator), Diluted	7,396,716	7,516,451	7,561,982
Earnings per share, Diluted	$ 2.65	$ 2.36	$ 2.34

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