Business segment reporting (Details 1) - BRL (R$) R$ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| 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 |