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Earnings per share - Schedule of Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net Income (Numerator), Basic	$ 4,431	$ 3,331	$ 9,475	$ 8,029
Average common shares outstanding (Denominator), Basic	7,546,198	7,548,358	7,547,272	7,549,300
Earnings per share, Basic	$ 0.59	$ 0.44	$ 1.26	$ 1.06
Net Income (Numerator), Diluted	$ 4,431	$ 3,331	$ 9,475	$ 8,029
Average common shares outstanding (Denominator), Diluted	7,546,198	7,570,883	7,547,272	7,575,655
Earnings per share, Diluted	$ 0.59	$ 0.44	$ 1.26	$ 1.06

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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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