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EARNINGS PER SHARE (Details)-1 - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
EARNINGS PER SHARE        
Weighted-average anti-dilutive stock options outstanding (in shares) 30,000.00 200,000    
Basic earnings per share [Abstract]        
Net income $ 52,850 $ 40,134    
Income attributable to unvested stock-based compensation awards (130) (146)    
Income available to common shareholders $ 52,720 $ 39,988    
Weighted-average common shares outstanding - basic (in shares) 53,845,000 52,036,000    
Basic earnings per share (in dollars per share) $ 0.98 $ 0.77    
Diluted earnings per share [Abstract]        
Net income $ 52,850 $ 40,134    
Income attributable to unvested stock-based compensation awards (130) (146)    
Income available to common shareholders $ 52,720 $ 39,988    
Weighted-average common shares outstanding - basic (in shares) 53,845,000 52,036,000    
Assumed exercise of stock options (in shares) 438,000 420,000    
Weighted-average common shares outstanding - diluted (in shares) 54,283,000 52,456,000    
Diluted earnings per share (in dollars per share) $ 0.97 $ 0.76    
Stock Repurchase Program [Abstract]        
Number of common shares authorized to be repurchased (in shares)     2,680,000 2,600,000
Number of common shares repurchased (in shares) 0 0