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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator [Abstract]        
Net income $ 17,447 $ 15,269 $ 43,678 $ 48,532
Basic earnings per share [Abstract]        
Weighted average shares (in shares) 17,746,000 17,726,000 17,746,000 17,720,000
Diluted earnings per share [Abstract]        
Effect of dilutive stock options and restricted stock grants (in shares) 6,000 17,000 7,000 13,000
Adjusted weighted average shares (in shares) 17,752,000 17,743,000 17,753,000 17,733,000
Earnings per share [Abstract]        
Basic earnings per share (in dollars per share) $ 0.98 $ 0.86 $ 2.46 $ 2.74
Diluted earnings per share (in dollars per share) $ 0.98 $ 0.86 $ 2.46 $ 2.74
Options [Member]        
Earnings Per Share [Abstract]        
Options excluded from diluted calculations (in shares) 20,000 0 20,000 0
Options excluded from diluted calculations, weighted average price (in dollars per share) $ 32.27   $ 32.27