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18 RELATED-PARTY BALANCES AND TRANSACTIONS (Details 5) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related party transactions [abstract]      
Short-term benefits for employees and officers R$ 37,452 R$ 32,848 R$ 39,721
Post-employment benefits 109 105 110
Key management personnel compensation R$ 37,561 R$ 32,953 R$ 39,831