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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic        
Net income $ 5,880 $ 6,401 $ 16,967 $ 18,247
Weighted-average common shares outstanding 11,329,002 11,480,981 11,385,680 11,482,850
Basic earnings per share $ 0.52 $ 0.56 $ 1.49 $ 1.59
Diluted        
Net Income $ 5,880 $ 6,401 $ 16,967 $ 18,247
Weighted-average common shares outstanding 11,329,002 11,480,981 11,385,680 11,482,850
Effect of dilutive restricted stock, stock options and stock appreciation rights 158,177 151,711 161,005 171,890
Weighted-average common shares outstanding assuming dilution 11,487,179 11,632,692 11,546,685 11,654,740
Diluted earnings per share $ 0.51 $ 0.55 $ 1.47 $ 1.57