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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic        
Net income $ 6,222 $ 5,880 $ 17,924 $ 16,967
Weighted-average common shares outstanding 11,110,824 11,329,002 11,159,469 11,385,680
Basic earnings per share $ 0.56 $ 0.52 $ 1.61 $ 1.49
Diluted        
Net Income $ 6,222 $ 5,880 $ 17,924 $ 16,967
Weighted-average common shares outstanding 11,110,824 11,329,002 11,159,469 11,385,680
Effect of dilutive restricted stock and stock appreciation rights 158,541 158,177 155,112 161,005
Weighted-average common shares outstanding assuming dilution 11,269,365 11,487,179 11,314,581 11,546,685
Diluted earnings per share $ .55 $ .51 $ 1.58 $ 1.47