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Financial risk management - Credit risk - concentration of risk (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of credit risk exposure [line items]    
Securities R$ 33,406,040 R$ 19,515,659
Loans and advances to customer    
Disclosure of credit risk exposure [line items]    
Securities 17,216,362 8,790,058
Loans and advances to customer | Overdue by fewer than 15 days and to fall due within 90 days    
Disclosure of credit risk exposure [line items]    
Securities 2,849,136 2,593,572
Loans and advances to customer | From 3 to 12 months    
Disclosure of credit risk exposure [line items]    
Securities 3,868,156 1,357,068
Loans and advances to customer | Above 1 year    
Disclosure of credit risk exposure [line items]    
Securities 8,732,081 4,637,604
Loans and advances to customer | Overdue by 15 days or more    
Disclosure of credit risk exposure [line items]    
Securities 1,766,989 201,814
Loans and advances to customer | To fall due    
Disclosure of credit risk exposure [line items]    
Securities 15,449,373 8,588,244
Loans and advances to customer | To fall due | Overdue by fewer than 15 days and to fall due within 90 days    
Disclosure of credit risk exposure [line items]    
Securities 2,849,136 2,593,572
Loans and advances to customer | To fall due | From 3 to 12 months    
Disclosure of credit risk exposure [line items]    
Securities 3,868,156 1,357,068
Loans and advances to customer | To fall due | Above 1 year    
Disclosure of credit risk exposure [line items]    
Securities 8,732,081 4,637,604
Loans and advances to customer | Overdue    
Disclosure of credit risk exposure [line items]    
Securities 1,766,989 201,814
Loans and advances to customer | Overdue | Overdue by 15 days or more    
Disclosure of credit risk exposure [line items]    
Securities R$ 1,766,989 R$ 201,814