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Loan operations - Loan operations by type (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) R$ 365,169,005 R$ 321,697,974
Expected Credit Loss (799,193) (688,978)
Financial Assets At Amortized Cost Loan Operations 34,142,085 29,228,463
Loans operations    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 34,618,028 29,648,544
Expected Credit Loss (475,943) (420,081)
Loans to consumers [member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 26,185,440 23,217,323
Loans to consumers [member] | Loans And Receivables, Pledged Asset Loan [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 14,155,005 12,674,565
Loans to consumers [member] | Loans And Receivables, Non-Pledged Loan [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 4,549,379 4,516,553
Loans to consumers [member] | Loans And Receivables, Credit Card [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 7,481,056 6,026,205
Loans to government [member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 8,432,588 6,431,221
Loans to government [member] | Loans And Receivables, Pledged Asset Loan [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 265,192 549,148
Loans to government [member] | Loans And Receivables, Non-Pledged Loan [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) 6,251,739 3,506,397
Loans to government [member] | Loans And Receivables, Credit Card [Member]    
Disclosure of financial assets [line items]    
Securities - Brazilian sovereign bonds (Note 7A) R$ 1,915,657 R$ 2,375,676