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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
SHARE-BASED COMPENSATION    
Net income $ 18,038 $ 8,326
Weighted average shares outstanding - basic 28,108,648 28,126,400
Weighted average shares outstanding - diluted 28,313,014 28,277,753
Basic earnings per common share (in dollars per share) $ 0.64 $ 0.30
Diluted earnings per common share (in dollars per share) $ 0.64 $ 0.29
Stock Option    
SHARE-BASED COMPENSATION    
Dilutive effect of share-based compensation arrangements 204,366 151,353