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Summary of significant accounting policies - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share
Net Income, Basic									$ 18,457	$ 19,583	$ 17,723
Net Income (Loss) Attributable to Parent	$ 2,648	$ 5,350	$ 5,659	$ 4,800	$ 4,728	$ 5,118	$ 4,855	$ 4,882	$ 18,457	$ 19,583	$ 17,723
Average common shares outstanding, Basic									7,395,837	7,396,716	7,516,451
Earnings per share, Basic									$ 2.50	$ 2.65	$ 2.36
Diluted earnings per share
Net Income, Diluted									$ 18,457	$ 19,583	$ 17,723
Average common shares outstanding, Diluted									7,395,837	7,396,716	7,516,451
Earnings per share, Diluted									$ 2.50	$ 2.65	$ 2.36

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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