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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
Numerator [Abstract]        
Net income $ 11,222 $ 10,924 $ 34,562 $ 33,259
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 17,440,000 17,326,000 17,420,000 17,317,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options and restricted stock grants (in shares) 51,000 76,000 52,000 78,000
Adjusted weighted average shares (in shares) 17,491,000 17,402,000 17,472,000 17,395,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.64 $ 0.63 $ 1.98 $ 1.92
Diluted earnings per share (in dollars per share) $ 0.64 $ 0.63 $ 1.98 $ 1.91
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options excluded from diluted calculations (in shares) 0 63,270 0 0
Weighted average price for anti dilutive securities (in dollars per share)   $ 35.41   $ 35.41