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Derivative financial instruments (Details 5) - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Nominal Value Retained Risk Total Rate Of Return Swap [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit Derivatives Portfolio Stockholders Equity Credit Swaps |  | R$ 4,421,208
Credit Derivatives Portfolio Stockholders Equity Credit Total |  | 4,421,208
Nominal Value Transferred Risk Credit Swap [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Credit Derivatives Portfolio Stockholders Equity Credit Swaps | 7,950,397 | 16,153,307
Credit Derivatives Portfolio Stockholders Equity Credit Total | R$ 7,950,397 | R$ 16,153,307

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