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Business segment reporting (Details 1) - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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IfrsStatementLineItems [Line Items] |  |
Total assets | R$ 1,270,029,465 | R$ 1,238,796,810
Loans and advances to customers | 564,548,556 | 566,089,914
Customer deposits | 593,328,796 | 605,068,163
Business Segment Reporting Commercial Banking [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total assets | 1,180,389,914 | 1,143,663,122
Loans and advances to customers | 484,676,332 | 484,849,401
Customer deposits | 475,642,024 | 446,780,888
Business Segment Reporting Global Wholesale Banking [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Total assets | 89,639,551 | 95,133,688
Loans and advances to customers | 79,872,224 | 81,240,513
Customer deposits | R$ 117,686,772 | R$ 158,287,275

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