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Securities purchased (sold) under resale (repurchase) agreements - Summary of securities purchased under agreements to resell (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Expected credit loss R$ (2,803) R$ (2,681)
Securities purchased under agreements to resell R$ 14,888,978 R$ 7,603,820
Investments in purchase and sale commitments, interest rate 1185.00% 13.65%
Available portfolio    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell R$ 3,891,759 R$ 834,975
Securities purchased under agreements to resell 2,760,296 646,478
Available portfolio | National Treasury Notes    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 2,013,366 645,188
Available portfolio | National Treasury Bills    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 820,487 0
Available portfolio | Debentures    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 89,234 84,065
Available portfolio | Real Estate Receivable Certificates    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 80,565 82,633
Available portfolio | Financial credit bills    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 88,690 23,089
Available portfolio | Financial Treasury Bills    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 799,417 0
Collateral held    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 11,000,022 6,771,526
Collateral held | National Treasury Notes    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 116,583 2,842,159
Collateral held | National Treasury Bills    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 2,416,143 227,713
Collateral held | Debentures    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 4,258,213 929,346
Collateral held | Real Estate Receivable Certificates    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 2,436,462 2,019,639
Collateral held | Agribusiness Receivables Certificates (CRAs) (ii)    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 459,896 101,091
Collateral held | Agribusiness Credit Bill (LCAs) (ii)    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 0 171,730
Collateral held | Other    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 107,908 479,848
Collateral held | Financial Treasury Bills    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 900,245 0
Collateral held | Interbank Deposits Certificates [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell R$ 304,572 R$ 0