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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basic        
Net income $ 6,401 $ 6,138 $ 18,247 $ 18,243
Weighted-average common shares outstanding 11,480,981 11,450,978 11,482,850 11,435,400
Basic earnings per share $ 0.56 $ 0.54 $ 1.59 $ 1.60
Diluted        
Net Income $ 6,401 $ 6,138 $ 18,247 $ 18,243
Weighted-average common shares outstanding 11,480,981 11,450,978 11,482,850 11,435,400
Effect of dilutive restricted stock, stock options and stock appreciation rights 151,711 217,085 171,890 191,915
Weighted-average common shares outstanding assuming dilution 11,632,692 11,668,063 11,654,740 11,627,315
Diluted earnings per share $ 0.55 $ 0.53 $ 1.57 $ 1.57