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Financial risk management - Credit risk - maximum exposure (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk R$ 35,012,793 R$ 18,997,105
Maximum transaction value R$ 15,000  
Maximum percentage of regulatory capital 1.00%  
Balances of "Cash and cash equivalents"    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk R$ 500,446 2,154,687
Amounts due from financial institutions    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 2,051,862 502,369
Compulsory deposits at Banco Central do Brasil [Member]    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 2,399,488 1,709,729
Derivative financial instrument    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 86,948 27,513
Loans and advances to customer    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 17,216,362 8,790,058
Other financial assets    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 12,757,687 5,812,622
Subtotal    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk R$ 35,012,793 18,996,978
Financial guarantees provided    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk   R$ 127