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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic:
Net income	$ 7,610	$ 6,863	$ 23,211	$ 19,683
Weighted-average common shares outstanding	12,245,975	12,251,084	12,239,678	12,257,337
Basic earnings per share	$ 0.62	$ 0.56	$ 1.90	$ 1.61
Diluted:
Net Income	$ 7,610	$ 6,863	$ 23,211	$ 19,683
Weighted-average common shares outstanding	12,245,975	12,251,084	12,239,678	12,257,337
Effect of dilutive restricted stock and stock appreciation rights	206,388	176,767	200,315	179,029
Weighted-average common shares outstanding assuming dilution	12,452,363	12,427,851	12,439,993	12,436,366
Diluted earnings per share	$ 0.61	$ 0.55	$ 1.87	$ 1.58

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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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