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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net Income (Numerator), Basic	$ 17,723	$ 17,649	$ 5,721
Average common shares outstanding (Denominator), Basic	7,516,451	7,548,825	4,733,059
Earnings per share, Basic	$ 2.36	$ 2.34	$ 1.21
Net Income (Numerator), Diluted	$ 17,723	$ 17,649	$ 5,721
Average common shares outstanding (Denominator), Diluted	7,516,451	7,561,982	4,733,059
Earnings per share, Diluted	$ 2.36	$ 2.34	$ 1.21

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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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