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5 Risk management (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of risk management [Line Items]    
Borrowings R$ 14,185,384 R$ 9,224,174
Certificado de deposito interbancario [member]    
Summary of risk management [Line Items]    
Borrowings [1] 7,836,988 1,866,755
Interest benchmark rate [member]    
Summary of risk management [Line Items]    
Borrowings [2] 1,619,416 1,675,203
Indice nacional de precos ao consumidor amplo [member]    
Summary of risk management [Line Items]    
Borrowings [3] 2,176,547 1,366,134
Taxa de juros a longo prazo [member]    
Summary of risk management [Line Items]    
Borrowings [4] 1,517,657 1,381,342
London interbank offered rate [member]    
Summary of risk management [Line Items]    
Borrowings [5] 870,337 2,829,073
Interest and charges [member]    
Summary of risk management [Line Items]    
Borrowings R$ 164,439 R$ 105,667
[1] CDI (Certificado de Deposito Interbancario), an interbank deposit certificate
[2] TR - Interest Benchmark Rate
[3] IPCA - (Indice Nacional de Precos ao Consumidor Amplo), a consumer price index
[4] TJLP - (Taxa de Juros a Longo Prazo), a long-term interest rate index
[5] LIBOR London Interbank Offered Rate