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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Numerator [Abstract]    
Net income $ 11,602 $ 10,938
Basic earnings per share [Abstract]    
Weighted average shares (in shares) 17,513,000 17,400,000
Diluted earnings per share [Abstract]    
Effect of dilutive stock options and restricted stock grants (in shares) 20,000 51,000
Adjusted weighted average shares (in shares) 17,533,000 17,451,000
Earnings per share [Abstract]    
Basic earnings per share (in dollars per share) $ 0.66 $ 0.63
Diluted earnings per share (in dollars per share) $ 0.66 $ 0.63
Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Options excluded from diluted calculations (in shares) 57,953 68,063
Weighted average price for anti dilutive securities (in dollars per share) $ 35.41 $ 35.41