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Earnings per share - Schedule of Earnings per Share (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net Income (Numerator), Basic	$ 4,409	$ 5,236	$ 13,884	$ 13,265
Average common shares outstanding (Denominator), Basic	7,536,824	7,548,358	7,543,751	7,548,983
Earnings per share, Basic	$ 0.58	$ 0.70	$ 1.84	$ 1.76
Net Income (Numerator), Diluted	$ 4,409	$ 5,236	$ 13,884	$ 13,265
Average common shares outstanding (Denominator), Diluted	7,536,824	7,548,358	7,543,751	7,566,456
Earnings per share, Diluted	$ 0.58	$ 0.70	$ 1.84	$ 1.76

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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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