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EMPLOYEE BENEFIT PLANS - Summary of changes in non-vested restricted shares (Details) - Restricted shares of common stock - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares      
Non-vested shares at beginning 678,220 815,540  
Granted 189,750 179,000  
Vested (194,800) (310,520)  
Forfeited (1,800) (5,800)  
Non-vested shares at ending 671,370 678,220 815,540
Weighted Average Grant-Date Fair Value      
Non-vested shares at beginning $ 12.89 $ 11.29  
Granted 16.55 15.00 $ 17.21
Vested 10.25 9.91  
Forfeited 11.76 13.09  
Non-vested shares at ending $ 14.70 $ 12.89 $ 11.29