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Securities purchased (sold) under resale (repurchase) agreements - Securities sold under repurchase agreements (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements R$ 33,340,511 R$ 31,790,091
Securities purchased under agreements to resell 14,888,978 7,603,820
Available portfolio    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities purchased under agreements to resell 2,760,296 646,478
National Treasury Bills    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 3,274,568 8,569,145
National Treasury Notes    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 8,456,861 12,347,218
Financial Treasury Bills    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 1,867,365 533,509
Debentures    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 8,776,735 1,831,846
Real Estate Receivable Certificates    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 9,201,853 6,471,410
Financial credit bills    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements 954,447 1,111,890
Agribusiness Receivables Certificates (CRAs) (ii)    
Securities Purchased Under Agreements to Resell [Line Items]    
Securities sold under repurchase agreements R$ 808,682 R$ 925,073