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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Basic        
Net income $ 6,138 $ 6,092 $ 18,243 $ 17,962
Weighted-average common shares outstanding 11,450,978 11,380,047 11,435,400 11,371,141
Basic earnings per share $ 0.54 $ 0.53 $ 1.60 $ 1.58
Diluted        
Net Income $ 6,138 $ 6,092 $ 18,243 $ 17,962
Weighted-average common shares outstanding 11,450,978 11,380,047 11,435,400 11,371,141
Effect of dilutive restricted stock, stock options and stock appreciation rights 217,085 177,499 191,915 178,948
Weighted-average common shares outstanding assuming dilution 11,668,063 11,557,546 11,627,315 11,550,089
Diluted earnings per share $ 0.53 $ 0.53 $ 1.57 $ 1.56