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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Basic
Net income	$ 6,863	$ 6,222	$ 19,683	$ 17,924
Weighted-average common shares outstanding	11,137,451	11,110,824	11,143,116	11,159,469
Basic earnings per share	$ 0.62	$ 0.56	$ 1.77	$ 1.61
Diluted
Net Income	$ 6,863	$ 6,222	$ 19,683	$ 17,924
Weighted-average common shares outstanding	11,137,451	11,110,824	11,143,116	11,159,469
Effect of dilutive restricted stock and stock appreciation rights	164,439	158,541	166,442	155,112
Weighted-average common shares outstanding assuming dilution assuming dilution	11,301,890	11,269,365	11,309,558	11,314,581
Diluted earnings per share	$ 0.61	$ 0.55	$ 1.74	$ 1.58

X

- Definition

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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