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Transactions with related parties - Schedule of summary (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [line items]      
Income of loans and advances to costumers R$ (7,163)    
Interest expenses (1,542) R$ (20,638) R$ (14,956)
Other administrative revenues (expenses) (737) (1,085)  
Other operating expenses (180,352)    
Demand deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (97,116) (7,710)  
Time deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (259,975) (284,840)  
Other liabilities      
Disclosure of transactions between related parties [line items]      
Amounts payable (32,339)    
Loans and advances to costumers and Debentures      
Disclosure of transactions between related parties [line items]      
Amounts receivable 606,025 137,250  
Securities      
Disclosure of transactions between related parties [line items]      
Amounts receivable 81,534    
Parent Company      
Disclosure of transactions between related parties [line items]      
Income of loans and advances to costumers (7,163)    
Interest expenses (813) (2,503) (3,564)
Other operating expenses (180,352)    
Parent Company | Demand deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (86,997) (30)  
Parent Company | Time deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (87,928) (22,471)  
Parent Company | Other liabilities      
Disclosure of transactions between related parties [line items]      
Amounts payable (32,339)    
Parent Company | Loans and advances to costumers and Debentures      
Disclosure of transactions between related parties [line items]      
Amounts receivable 159,269 9  
Parent Company | Securities      
Disclosure of transactions between related parties [line items]      
Amounts receivable 81,534    
Key management personnel      
Disclosure of transactions between related parties [line items]      
Interest expenses (215) (2,181) (797)
Key management personnel | Demand deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (800) (2,287)  
Key management personnel | Time deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (25,962) (37,816)  
Key management personnel | Loans and advances to costumers and Debentures      
Disclosure of transactions between related parties [line items]      
Amounts receivable 19,789 2,615  
Other related parties      
Disclosure of transactions between related parties [line items]      
Interest expenses (514) (15,954) R$ (10,595)
Other administrative revenues (expenses) (737) (1,085)  
Other related parties | Demand deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (9,319) (5,393)  
Other related parties | Time deposits      
Disclosure of transactions between related parties [line items]      
Amounts payable (146,085) (224,553)  
Other related parties | Loans and advances to costumers and Debentures      
Disclosure of transactions between related parties [line items]      
Amounts receivable R$ 426,967 R$ 134,626