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5 Risk management (Details 7) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Summary of risk management [Line Items]    
Exposure interest rate risk R$ 3,563,170 R$ 6,382,009
Interest rate risk [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Liabilities (264,732)  
Exposure interest rate risk (121,762)  
Interest rate risk [member] | Scenario I (probable) [member] | Financial income [member]    
Summary of risk management [Line Items]    
Assets 113,348  
Interest rate risk [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Liabilities (330,916)  
Exposure interest rate risk (152,203)  
Interest rate risk [member] | Scenario II (+25%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities (293,887)  
Interest rate risk [member] | Scenario II (+25%) [member] | Financial income [member]    
Summary of risk management [Line Items]    
Assets 141,684  
Interest rate risk [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Liabilities (397,098)  
Exposure interest rate risk (182,643)  
Interest rate risk [member] | Scenario III (+50%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities (352,664)  
Interest rate risk [member] | Scenario III (+50%) [member] | Financial income [member]    
Summary of risk management [Line Items]    
Assets 170,021  
Interest rate risk [member] | Scenario I (+25%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities (235,110)  
Interest rate risk [member] | CDI [member] | Exposure [member]    
Summary of risk management [Line Items]    
Assets 3,778,252  
Liabilities (7,836,988)  
Exposure interest rate risk R$ (4,058,736)  
Interest rate risk [member] | CDI [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Interest, Assets [1] 3.00%  
Interest, Liabilities [1] 3.00%  
Interest rate risk [member] | CDI [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Interest, Assets 3.75%  
Interest, Liabilities 3.75%  
Interest rate risk [member] | CDI [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Interest, Assets 4.50%  
Interest, Liabilities 4.50%  
Interest rate risk [member] | TR [member] | Exposure [member]    
Summary of risk management [Line Items]    
Liabilities R$ (1,619,416)  
Interest rate risk [member] | TR [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities [2] 0.0001%  
Interest rate risk [member] | TR [member] | Scenario I (probable) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (2)  
Interest rate risk [member] | TR [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 0.0001%  
Interest rate risk [member] | TR [member] | Scenario II (+25%) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (2)  
Interest rate risk [member] | TR [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 0.0002%  
Interest rate risk [member] | TR [member] | Scenario III (+50%) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (3)  
Interest rate risk [member] | IPCA [member] | Exposure [member]    
Summary of risk management [Line Items]    
Liabilities R$ (2,176,547)  
Interest rate risk [member] | IPCA [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities [1] 3.32%  
Interest rate risk [member] | IPCA [member] | Scenario I (probable) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (72,261)  
Interest rate risk [member] | IPCA [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 4.15%  
Interest rate risk [member] | IPCA [member] | Scenario II (+25%) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (90,327)  
Interest rate risk [member] | IPCA [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 4.98%  
Interest rate risk [member] | IPCA [member] | Scenario III (+50%) [member] | Expenses to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (108,392)  
Interest rate risk [member] | TJLP [member] | Exposure [member]    
Summary of risk management [Line Items]    
Liabilities R$ (1,517,657)  
Interest rate risk [member] | TJLP [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities [1] 4.55%  
Interest rate risk [member] | TJLP [member] | Scenario I (probable) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (69,053)  
Interest rate risk [member] | TJLP [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 5.6875%  
Interest rate risk [member] | TJLP [member] | Scenario II (+25%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (86,317)  
Interest rate risk [member] | TJLP [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 6.825%  
Interest rate risk [member] | TJLP [member] | Scenario III (+50%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (103,580)  
Interest rate risk [member] | LIBOR [member] | Exposure [member]    
Summary of risk management [Line Items]    
Liabilities R$ (870,337)  
Interest rate risk [member] | LIBOR [member] | Scenario I (probable) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities [3] 0.19%  
Interest rate risk [member] | LIBOR [member] | Scenario I (probable) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (1,654)  
Interest rate risk [member] | LIBOR [member] | Scenario II (+25%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 0.2375%  
Interest rate risk [member] | LIBOR [member] | Scenario II (+25%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (2,067)  
Interest rate risk [member] | LIBOR [member] | Scenario III (+50%) [member]    
Summary of risk management [Line Items]    
Interest, Liabilities 0.285%  
Interest rate risk [member] | LIBOR [member] | Scenario III (+50%) [member] | Interest to be incurred [member]    
Summary of risk management [Line Items]    
Liabilities R$ (2,480)  
[1] Source: CDI and IPCA (BACEN Focus Report, December 31, 2020) and long-term interest rate as of December 31, 2020 (BACEN).
[2] Source: B3.
[3] Source: Bloomberg.