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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Numerator [Abstract]        
Net income $ 13,763 $ 12,312 $ 36,581 $ 35,480
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 17,633,000 17,554,000 17,625,000 17,532,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options and restricted stock grants (in shares) 20,000 15,000 20,000 16,000
Adjusted weighted average shares (in shares) 17,653,000 17,569,000 17,645,000 17,548,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.78 $ 0.70 $ 2.08 $ 2.02
Diluted earnings per share (in dollars per share) $ 0.78 $ 0.70 $ 2.07 $ 2.02
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Options excluded from diluted calculations (in shares) 0 0 0 15,730
Weighted average price for anti dilutive securities (in dollars per share)   $ 35.409   $ 35.409