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Earnings per share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings per share
Net Income (Numerator), Basic	$ 4,882	$ 5,044
Average common shares outstanding (Denominator), Basic	7,403,510	7,548,358
Earnings per share, Basic	$ 0.66	$ 0.67
Net Income (Numerator), Diluted	$ 4,882	$ 5,044
Average common shares outstanding (Denominator), Diluted	7,403,510	7,548,358
Earnings per share, Diluted	$ 0.66	$ 0.67

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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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