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5 Risk management (Details 3) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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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

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