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SHAREHOLDERS' EQUITY - Treasury shares (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
SHAREHOLDERS' EQUITY    
Quantity 12,042,004  
Average cost per share R$ 18.13  
Historical value R$ 218,265 R$ 218,265
Market value R$ 720,232