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Earnings Per Share - Computation of Basic and Diluted 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
Basic earnings per common share computation:        
Net income per consolidated statements of income $ 7,785 $ 10,357 $ 24,844 $ 29,597
Net earnings allocated to participating securities (24) (37) (82) (114)
Net earnings allocated to common stock $ 7,761 $ 10,320 $ 24,762 $ 29,483
Weighted average common shares outstanding, including shares considered participating securities (in shares) 16,616,000 15,197,000 15,785,000 15,218,000
Less: Average participating securities (in shares) (47,000) (51,000) (50,000) (58,000)
Weighted average shares (in shares) 16,569,000 15,146,000 15,735,000 15,160,000
Basic earnings per common share (in dollar per share) $ 0.47 $ 0.68 $ 1.57 $ 1.94
Diluted earnings per common share computation:        
Net earnings allocated to common stock $ 7,761 $ 10,320 $ 24,762 $ 29,483
Weighted average common shares outstanding for basic earnings per common share (in shares) 16,569,000 15,146,000 15,735,000 15,160,000
Add: Dilutive effects of performance based-shares (in shares) 0 0 0 0
Weighted average shares and dilutive potential common shares (in shares) 16,569,000 15,146,000 15,735,000 15,160,000
Diluted earnings per common share (in dollar per share) $ 0.47 $ 0.68 $ 1.57 $ 1.94
Distributed earnings allocated to common stock        
Basic earnings per common share computation:        
Net earnings allocated to common stock $ 2,863 $ 2,573 $ 8,079 $ 7,734
Undistributed earnings allocated to common stock        
Basic earnings per common share computation:        
Net earnings allocated to common stock $ 4,898 $ 7,747 $ 16,683 $ 21,749