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Net gains (losses) on financial instruments measured at fair value through profit or loss (Tables) | 12 Months Ended
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Dec. 31, 2025
Net gains (losses) on financial instruments measured at fair value through profit or loss [Abstract] |
Summary of Net gains (losses) on financial instruments measured at fair value through profit or loss | Net gains (losses) on financial instruments measured at fair value through profit or loss for the years ended December 31, 2023, 2024 and 2025 are as follows:
|  | 2023 |  |  | 2024 |  |  | 2025 |
Net gain (loss) on due from banks measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on valuation |  | W | 3,964 |  |  |  | (711 | ) |  |  | 6,465 |
Net gain (loss) on loans measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Loss on valuation |  |  | (6,562 | ) |  |  | (2,755 | ) |  |  | (68,284 | )
Gain on sale |  |  | 36,774 |  |  |  | 90,227 |  |  |  | 487 |
|  |  | 30,212 |  |  |  | 87,472 |  |  |  | (67,797 | )
Net gain on securities measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  |  |  |  |  |  |  |  |  |  |
Gain on valuation |  |  | 755,501 |  |  |  | 663,877 |  |  |  | 204,485 |
Gain (loss) on sale |  |  | 197,148 |  |  |  | (39,354 | ) |  |  | (10,263 | )
Other gains |  |  | 624,282 |  |  |  | 803,645 |  |  |  | 687,136 |
|  |  | 1,576,931 |  |  |  | 1,428,168 |  |  |  | 881,358 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |
Gain on valuation |  |  | 540,188 |  |  |  | 161,316 |  |  |  | 934,475 |
Gain on sale |  |  | 428,947 |  |  |  | 485,566 |  |  |  | 495,672 |
|  |  | 969,135 |  |  |  | 646,882 |  |  |  | 1,430,147 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Gain on valuation |  |  | 11,635 |  |  |  | 36,688 |  |  |  | 337,239 |
|  |  | 2,557,701 |  |  |  | 2,111,738 |  |  |  | 2,648,744 |
Net loss on financial liabilities measured at FVTPL |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on valuation |  |  | (60,144 | ) |  |  | (3,593 | ) |  |  | 9,972 |
Loss on disposal |  |  | (88,398 | ) |  |  | (249,398 | ) |  |  | (39,802 | )
|  |  | (148,542 | ) |  |  | (252,991 | ) |  |  | (29,830 | )
Other |  |  |  |  |  |  |  |  |  |  |  |
Loss on valuation |  |  | (60,565 | ) |  |  | (173,058 | ) |  |  | (527,558 | )
Gain on disposal |  |  | 1,606 |  |  |  | 2,930 |  |  |  | 12,331 |
|  |  | (58,959 | ) |  |  | (170,128 | ) |  |  | (515,227 | )
|  |  | (207,501 | ) |  |  | (423,119 | ) |  |  | (545,057 | )
Derivatives: |  |  |  |  |  |  |  |  |  |  |  |
Gain on valuation |  |  | 292,483 |  |  |  | 82,184 |  |  |  | 510,524 |
Loss on transaction |  |  | (183,233 | ) |  |  | (646,793 | ) |  |  | (143,514 | )
|  |  | 109,250 |  |  |  | (564,609 | ) |  |  | 367,010 |
|  | W | 2,493,626 |  |  |  | 1,210,771 |  |  |  | 2,409,365 |

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