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Net gains (losses) on financial instruments designated at fair value through profit or loss (Tables) | 12 Months Ended
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Dec. 31, 2025
Net gains (losses) on financial instruments designated at fair value through profit or loss [Abstract] |
Summary of Net gains (losses) on financial instruments designated at fair value through profit or loss | Net gains (losses) on financial instruments designated at fair value through profit or loss for the years ended December 31, 2023, 2024 and 2025 are as follows:
|  | 2023 |  |  | 2024 |  |  | 2025 |
Financial liabilities designated at FVTPL: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities issued: |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on valuation |  | W | 2,495 |  |  |  | (6,466 | ) |  |  | 23,435 |
Gain on sale |  |  | — |  |  |  | — |  |  |  | 11 |
|  |  | 2,495 |  |  |  | (6,466 | ) |  |  | 23,446 |
Compound financial instruments: |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on valuation |  |  | 51,750 |  |  |  | (29,162 | ) |  |  | 19,796 |
Loss on sale and redemption |  |  | (492,025 | ) |  |  | (308,825 | ) |  |  | (457,190 | )
|  |  | (440,275 | ) |  |  | (337,987 | ) |  |  | (437,394 | )
|  | W | (437,780 | ) |  |  | (344,453 | ) |  |  | (413,948 | )

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