| Line Item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 |
|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | |||||||||
| Operating Revenues | |||||||||
| Interest and similar income | |||||||||
| Interest and similar expense | |||||||||
| Income of Financial Assets and Liabilities at Fair Value through Profit or Loss | |||||||||
| Foreign exchange results and exchange variations in foreign transactions | |||||||||
| Commissions and Banking Fees | |||||||||
| Income from Insurance Contracts and Private Pension | |||||||||
| Income from Insurance Contracts and Private Pension, net of Reinsurance | |||||||||
| Financial Income from Insurance Contracts and Private Pension, net of Reinsurance | |||||||||
| Income from Financial Assets related to Insurance Contracts and Private Pension | |||||||||
| Other income / (expenses) | |||||||||
| Expected Credit Loss from Financial Assets | |||||||||
| Expected Credit Loss with Loan and Lease Operations | |||||||||
| Expected Credit Loss with Other Financial Asset, net | |||||||||
| Operating Revenues Net of Expected Credit Losses from Financial Assets | |||||||||
| Other operating income / (expenses) | |||||||||
| General and administrative expenses | |||||||||
| Tax expenses | |||||||||
| Share of profit or (loss) in associates and joint ventures | |||||||||
| Income / (loss) before income tax and social contribution | |||||||||
| Current income tax and social contribution | |||||||||
| Deferred income tax and social contribution | |||||||||
| Net income / (loss) | |||||||||
| Net income attributable to owners of the parent company | |||||||||
| Net income / (loss) attributable to non-controlling interests |