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STOCK BASED COMPENSATION PLANS - Restricted Stock Awards (Details) - Restricted Stock Awards - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Unvested, January 1, 2019 324,882    
Granted 78,952    
Vested (90,586)    
Forfeited (19,531)    
Unvested, December 31, 2019 293,717 324,882  
Weighted Average Grant-Date Fair Value      
Unvested, January 1, 2019 $ 29.13    
Granted 31.92    
Vested 27.20    
Forfeited 30.62    
Unvested, December 31, 2019 $ 30.37 $ 29.13  
2019 Equity Incentive Plan      
Shares      
Granted   83,782 71,781