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22. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of transactions between related parties [abstract] |  |  |
Short-term benefits for employees and officers | R$ 40,522 | R$ 37,452 | R$ 32,848
Post-employment benefits | 111 | 109 | 105
Key management personnel compensation | R$ 40,633 | R$ 37,561 | R$ 32,953

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