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LONG-TERM INCENTIVE PLANS - Exercise of stock options (Details) - Stock options
Dec. 31, 2018
BRL (R$)
Y
Options
Dec. 31, 2017
BRL (R$)
Options
Dec. 31, 2016
BRL (R$)
Options
Dec. 31, 2015
BRL (R$)
Options
Exercise price of options        
Quantity (in shares) 15,480 292,391 569,115 1,074,246
Average exercise price | R$ R$ 16.72 R$ 17.91 R$ 16.64 R$ 18.36
Number exercisable at end of the period (in shares) 15,480 57,668 57,678  
R$ 16.86        
Exercise price of options        
Exercise price | R$ R$ 16.86      
Quantity (in shares) 10,754      
Average period of grace (in years) | Y 0.2      
Average exercise price | R$ R$ 15.90      
Number exercisable at end of the period (in shares) 10,754      
R$ 18.58        
Exercise price of options        
Exercise price | R$ R$ 18.58      
Quantity (in shares) 4,726      
Average period of grace (in years) | Y 4.0      
Average exercise price | R$ R$ 18.58      
Number exercisable at end of the period (in shares) 4,726