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
Basic
Net income	$ 5,869	$ 5,548	$ 11,702	$ 11,087
Weighted-average common shares outstanding	11,134,559	11,388,907	11,184,058	11,414,489
Basic earnings per share	$ 0.53	$ 0.49	$ 1.05	$ 0.97
Diluted
Net Income	$ 5,869	$ 5,548	$ 11,702	$ 11,087
Weighted-average common shares outstanding	11,134,559	11,388,907	11,184,058	11,414,489
Effect of dilutive restricted stock and stock appreciation rights	153,459	163,898	153,379	162,705
Weighted-average common shares outstanding assuming dilution	11,288,018	11,552,805	11,337,437	11,577,194
Diluted earnings per share	$ 0.52	$ 0.48	$ 1.03	$ 0.96

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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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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