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31. FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 12) - Federal risk [member]
 12 Months Ended
Dec. 31, 2020
A1 rating [member]  
Disclosure of credit risk exposure [line items]  
Equity Over R$ 3.5 billion
Percentage of limit per bank entity Between 6% and 9% [1]
A2 Rating [member]  
Disclosure of credit risk exposure [line items]  
Equity R$ 1.0 billion to R$ 3.5 billion
Percentage of limit per bank entity Between 5% and 8% [1]
A3 rating [member]  
Disclosure of credit risk exposure [line items]  
Equity R$ 400 to R$ 1.0 billion
Percentage of limit per bank entity Between 0% and 7% [1]
[1] The percentage assigned to each bank depends on individual assessment of indicators, e.g. liquidity, and quality of the credit portfolio.