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Securities purchased (sold) under resale (repurchase) agreements - Securities sold under repurchase agreements (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements R$ 58,713,869 R$ 71,779,721
Financial Assets At Amortized Cost Securities Purchased Under Agreements To Resell 17,063,099 22,057,137
Brazilian sovereign bonds [Member]    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 21,595,733 45,871,065
Debentures [Member]    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 22,607,747 14,889,816
Real Estate Receivable Certificates    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 7,336,475 9,260,382
Agribusiness Receivables Certificates (CRA) [Member]    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 1,544,830 1,741,369
Corporate debt – foreign [Member]    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements 5,629,084 0
Other securities sold under repurchase agreements [Member]    
Securities Purchased Under Agreements to Resell [Line Items]    
Financial Liabilities At Amortized Cost Securities Sold Under Repurchase Agreements R$ 0 R$ 17,088