| 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] | |||||||||
| Interest Income | |||||||||
| Interest and similar expenses | |||||||||
| Net Interest Income | |||||||||
| Equity instrument income | |||||||||
| Equity method income (loss) | |||||||||
| Fee and commission income | |||||||||
| Fee and commission expense | |||||||||
| Gains (losses) on financial assets and liabilities (net) | |||||||||
| Financial assets measured at fair value through profit or loss | |||||||||
| Financial instruments not measured at fair value through profit or loss | |||||||||
| Hedge and Other | |||||||||
| Foreign exchange fluctuations (net) | |||||||||
| Operating Income | |||||||||
| Total Income | |||||||||
| Administrative expenses | |||||||||
| Personnel expenses | |||||||||
| Other administrative expenses | |||||||||
| Depreciation and amortization | |||||||||
| Permanent assets | |||||||||
| Intangible assets | |||||||||
| Provisions (net) | |||||||||
| Impairment losses on financial assets (net) | |||||||||
| Financial assets measured at amortized cost | |||||||||
| Impairment losses on other assets (net) | |||||||||
| Other intangible assets | |||||||||
| Other assets | |||||||||
| Gains (losses) on disposal of assets not classified as non-current assets held for sale | |||||||||
| Gain/Loss on Dispositions | |||||||||
| Operating Income Before Tax | |||||||||
| Income taxes | |||||||||
| Consolidated Net Income for the Fiscal Year | |||||||||
| Net Income | |||||||||
| Net Income Attributable to Noncontrolling Interest |