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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Balance beginning of period (in shares) 531,942    
Exercised (in shares) (113,312)    
Forfeited (in shares) 0    
Expired (in shares) (4,550)    
Balance end of period (in shares) 414,080 531,942  
Options Exercisable (in shares) 368,333    
Weighted Average Grant Date Fair Value      
Balance beginning of period (in usd per share) $ 11.54    
Exercised (in usd per share) 11.24    
Forfeited (in usd per share) 0    
Expired (in shares) 13.74    
Balance end of period (in usd per share) 11.60 $ 11.54  
Options Exercisable (in usd per share) $ 11.67    
Weighted Average Remaining Contractual Life      
Options Outstanding 2 years 2 months 12 days 3 years 1 month 6 days  
Options Exercisable at End of Period 2 years 3 months 18 days    
Aggregate Intrinsic Value ($ in millions)      
Options outstanding $ 2.3 $ 1.7  
Exercised 0.5 $ 0.5 $ 1.5
Options Exercisable $ 2.0