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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Basic        
Net income $ 5,548 $ 6,035 $ 11,087 $ 11,846
Weighted-average common shares outstanding 11,388,907 11,489,423 11,414,489 11,483,801
Basic earnings per share $ 0.49 $ 0.52 $ 0.97 $ 1.03
Diluted        
Net Income $ 5,548 $ 6,035 $ 11,087 $ 11,846
Weighted-average common shares outstanding 11,388,907 11,489,423 11,414,489 11,483,801
Effect of dilutive restricted stock, stock options and stock appreciation rights 163,898 169,724 162,705 182,146
Weighted-average common shares outstanding assuming dilution 11,552,805 11,659,147 11,577,194 11,665,947
Diluted earnings per share $ 0.48 $ 0.52 $ 0.96 $ 1.02