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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings per share
Net Income (Numerator), Basic	$ 4,855	$ 4,431	$ 9,737	$ 9,475
Average common shares outstanding (Denominator), Basic	7,395,127	7,546,198	7,399,318	7,547,272
Earnings per share, Basic	$ 0.66	$ 0.59	$ 1.32	$ 1.26
Net Income (Numerator), Diluted	$ 4,855	$ 4,431	$ 9,737	$ 9,475
Average common shares outstanding (Denominator), Diluted	7,395,127	7,546,198	7,399,318	7,547,272
Earnings per share, Diluted	$ 0.66	$ 0.59	$ 1.32	$ 1.26

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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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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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