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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator [Abstract]        
Net income $ 12,402 $ 12,195 $ 23,340 $ 22,335
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 17,421,000 17,318,000 17,411,000 17,313,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options and restricted stock grants (in shares) 44,000 75,000 47,000 80,000
Adjusted weighted average shares (in shares) 17,465,000 17,393,000 17,458,000 17,393,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.71 $ 0.70 $ 1.34 $ 1.29
Diluted earnings per share (in dollars per share) $ 0.71 $ 0.70 $ 1.34 $ 1.28
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options excluded from diluted calculations (in shares) 58,063 65,519 58,063 0
Weighted average price for anti dilutive securities (in dollars per share) $ 35.409 $ 35.409 $ 35.409 $ 35.409