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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net income available to common shareholders $ 18,251 $ 22,751 $ 47,249 $ 44,370
Less: earnings allocated to participating securities (180) (197) (463) (382)
Net earnings allocated to common shareholders 18,071 22,554 46,786 43,988
Distributed earnings allocated to common stock 9,073 8,615 18,147 17,231
Undistributed earnings allocated to common stock $ 8,998 $ 13,939 $ 28,639 $ 26,757
Average shares outstanding (in shares) 16,081 16,368 16,123 16,390
Effect of dilutive securities:        
Employee stock awards (in shares) 16 18 19 18
Average common shares outstanding, diluted (in shares) 16,097 16,386 16,142 16,408
Basic earnings per common share (in dollars per share) $ 1.12 $ 1.38 $ 2.90 $ 2.68
Diluted earnings per share (in dollars per share) $ 1.12 $ 1.38 $ 2.90 $ 2.68