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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, 2025
Dec. 31, 2024
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Expected credit loss R$ (2,565) R$ (2,364)
Financial Assets At Amortized Cost Securities Purchased Under Agreements To Resell R$ 17,063,099 R$ 22,057,137
Investments in purchase and sale commitments, interest rate 15.44% 12.30%
Collateral held    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed R$ 3,295,803 R$ 3,163,705
Collateral held | National Treasury Notes    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 2,530,502 3,020,502
Collateral held | Debentures [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 573,982 27,560
Collateral held | Real Estate Receivable Certificates    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 101,281 11,073
Collateral held | Other Securities purchased (sold) under resale (repurchase) agreements [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 90,038 104,570
Collateral repledge [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 11,866,126 18,895,796
Collateral repledge [Member] | Debentures [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 8,761,184 4,304,132
Collateral repledge [Member] | Real Estate Receivable Certificates    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 1,729,958 1,982,544
Collateral repledge [Member] | Agribusiness Receivables Certificates (CRA) [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 0 120,652
Collateral repledge [Member] | Other Securities purchased (sold) under resale (repurchase) agreements [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 482,098 375,193
Collateral repledge [Member] | Interbank Deposits Certificates [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 632,257 815,302
Collateral sold [Member]    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed 1,903,735 0
Collateral sold [Member] | National Treasury Notes    
Summary of Securities Purchased Under Agreements to Resell [Line Items]    
Reverse repurchase agreements and cash collateral on securities borrowed R$ 1,903,735 R$ 0