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Securities at fair value through other comprehensive income and securities at amortized cost (Tables) | 12 Months Ended
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Dec. 31, 2025
Securities at fair value through other comprehensive income and securities at amortized cost [Abstract] |
Securities at fair value through other comprehensive income and securities at amortized cost |
| (a) | Details of securities at FVOCI and securities at amortized cost as of December 31, 2024 and 2025 are as follows:
|  | 2024 |  |  | 2025 |
Securities at FVOCI: |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |
Government bonds |  | W | 42,463,118 |  |  |  | 44,038,340 |
Financial institutions bonds |  |  | 25,983,405 |  |  |  | 35,435,282 |
Corporate bonds and others |  |  | 23,569,687 |  |  |  | 21,809,284 |
|  |  | 92,016,210 |  |  |  | 101,282,906 |
Equity securities (*): |  |  |  |  |  |  |  |
Stocks |  |  | 1,594,019 |  |  |  | 1,830,922 |
Equity investments |  |  | 4,367 |  |  |  | 594 |
Others |  |  | 190,773 |  |  |  | 102,528 |
|  |  | 1,789,159 |  |  |  | 1,934,044 |
|  |  | 93,805,369 |  |  |  | 103,216,950 |
Securities at amortized cost: |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |
Government bonds |  |  | 21,808,057 |  |  |  | 22,779,176 |
Financial institutions bonds |  |  | 3,787,661 |  |  |  | 1,837,790 |
Corporate bonds and others |  |  | 7,720,281 |  |  |  | 7,327,402 |
|  |  | 33,315,999 |  |  |  | 31,944,368 |
|  | W | 127,121,368 |  |  |  | 135,161,318 |
| (*) | The equity securities are designated as FVOCI, as the Group has exercised the FVOCI option for reasons including policy-driven holding requirements.
Changes in carrying value of securities at fair value through other comprehensive income and securities at amortized cost |
| (b) | Changes in carrying amount of debt securities at fair value through other comprehensive income and securities at amortized cost for the years ended December 31, 2024 and 2025 are as follows:
|  | 2024 |
|  | Debt securities at FVOCI |  |  | Debt securities at amortized cost |
| 12-month expected credit losses |  |  | Life time expected credit losses |  |  | Total |  |  | 12-month expected credit losses |  |  | Life time expected credit losses |  |  | Total |
Beginning balance |  | W | 88,545,051 |  |  |  | 91,949 |  |  |  | 88,637,000 |  |  |  | 35,690,387 |  |  |  | 7,523 |  |  |  | 35,697,910 |
Transfer (from) to 12-month expected credit losses |  |  | 3,798 |  |  |  | (3,798 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer (from) to lifetime expected credit losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net increase (decrease) (*) |  |  | 3,406,603 |  |  |  | (27,393 | ) |  |  | 3,379,210 |  |  |  | (2,367,844 | ) |  |  | (3,879 | ) |  |  | (2,371,723 | )
Ending balance |  | W | 91,955,452 |  |  |  | 60,758 |  |  |  | 92,016,210 |  |  |  | 33,322,543 |  |  |  | 3,644 |  |  |  | 33,326,187 |
|  | 2025 |
|  | Debt securities at FVOCI |  |  | Debt securities at amortized cost |
| 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |  |  | 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |
Beginning balance |  | W | 91,955,452 |  |  |  | 60,758 |  |  |  | 92,016,210 |  |  |  | 33,322,543 |  |  |  | 3,644 |  |  |  | 33,326,187 |
Transfer (from) to 12-month expected credit losses |  |  | 5,276 |  |  |  | (5,276 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer (from) to lifetime expected credit losses |  |  | (2,939 | ) |  |  | 2,939 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net increase (decrease) (*) |  |  | 9,298,286 |  |  |  | (31,590 | ) |  |  | 9,266,696 |  |  |  | (1,369,484 | ) |  |  | (3,644 | ) |  |  | (1,373,128 | )
Ending balance |  | W | 101,256,075 |  |  |  | 26,831 |  |  |  | 101,282,906 |  |  |  | 31,953,059 |  |  |  | — |  |  |  | 31,953,059 |
(*) | Includes the effects of purchases, disposals, redemptions, valuations, changes in foreign exchange rates, and the amortization of fair value adjustments recognized through business combination accounting, among others.
Changes in allowance for credit loss of securities at fair value through other comprehensive income and securities at amortized cost |
| (c) | Changes in allowance for credit loss of debt securities at fair value through other comprehensive income and securities at amortized cost for the years ended December 31, 2024 and 2025 are as follows:
|  | 2024 |
|  | Debt securities at FVOCI |  |  | Debt securities at amortized cost |
| 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |  |  | 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |
Beginning balance |  | W | 41,568 |  |  |  | 909 |  |  |  | 42,477 |  |  |  | 11,283 |  |  |  | 140 |  |  |  | 11,423 |
Transfer (from) to 12-month expected credit losses |  |  | 14 |  |  |  | (14 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer (from) to lifetime expected credit losses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Provision (Reversal) |  |  | (2,279 | ) |  |  | (420 | ) |  |  | (2,699 | ) |  |  | (1,515 | ) |  |  | (97 | ) |  |  | (1,612 | )
Disposal and others (*) |  |  | (1,053 | ) |  |  | (379 | ) |  |  | (1,432 | ) |  |  | 369 |  |  |  | 8 |  |  |  | 377 |
Ending balance |  | W | 38,250 |  |  |  | 96 |  |  |  | 38,346 |  |  |  | 10,137 |  |  |  | 51 |  |  |  | 10,188 |
|  | 2025 |
|  | Debt securities at FVOCI |  |  | Debt securities at amortized cost |
| 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |  |  | 12-month expected credit losses |  |  | Lifetime expected credit losses |  |  | Total |
Beginning balance |  | W | 38,250 |  |  |  | 96 |  |  |  | 38,346 |  |  |  | 10,137 |  |  |  | 51 |  |  |  | 10,188 |
Transfer (from) to 12-month expected credit losses |  |  | 17 |  |  |  | (17 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Transfer (from) to lifetime expected credit losses |  |  | (3 | ) |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Provision (Reversal) |  |  | 23,479 |  |  |  | 2,437 |  |  |  | 25,916 |  |  |  | (1,196 | ) |  |  | (47 | ) |  |  | (1,243 | )
Disposal and others (*) |  |  | (3,981 | ) |  |  | 20 |  |  |  | (3,961 | ) |  |  | (250 | ) |  |  | (4 | ) |  |  | (254 | )
Ending balance |  | W | 57,762 |  |  |  | 2,539 |  |  |  | 60,301 |  |  |  | 8,691 |  |  |  | — |  |  |  | 8,691 |
(*) | Includes the effects of restructuring of loans, debt-to-equity swaps, and changes in foreign exchange rates, among others.
Gain or loss on disposal of securities at fair value through other comprehensive income and securities at amortized cost |
| (d) | Gains and losses on disposal of securities at fair value through other comprehensive income and securities at amortized cost for the years ended December 31, 2023, 2024 and 2025 are as follows:
|  | 2023 |  |  | 2024 |  |  | 2025 |
Gain on disposal of securities at FVOCI |  | W | 50,793 |  |  |  | 197,708 |  |  |  | 287,564 |
Loss on disposal of securities at FVOCI |  |  | (180,368 | ) |  |  | (137,448 | ) |  |  | (93,952 | )
Gain on disposal of securities at amortized cost (*) |  |  | 358 |  |  |  | — |  |  |  | 2 |
Loss on disposal of securities at amortized cost (*) |  |  | (107 | ) |  |  | (23,155 | ) |  |  | (58 | )
|  | W | (129,324 | ) |  |  | 37,105 |  |  |  | 193,556 |
| (*) | The disposal of securities measured at amortized cost was driven by the exercise of early redemption options by the issuers and by the objective of securing additional asset duration for asset-liability management in response to changes in the interest rate environment.
Income or loss on equity securities at fair value through other comprehensive income |
| (e) | Income or loss on equity securities at fair value through other comprehensive income
| i) | The Group recognized dividends, amounting to W 60,139, W 86,107 million and W 71,328 million, related to equity securities designated at fair value through other comprehensive income for the years ended December 31, 2023, 2024 and 2025, respectively.
| ii) | The details of disposal of equity securities designated at fair value through other comprehensive income for the years ended December 31, 2024 and 2025 are as follows:
|  | Fair value at the date of disposal |  |  | Cumulative net gain at the time of disposal |
|  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |
Stocks |  | W | 106,810 |  |  |  | 155,004 |  |  |  | 9,429 |  |  |  | 4,467 |
Contingent convertible bonds |  |  | 3,023 |  |  |  | 1,687 |  |  |  | 5 |  |  |  | 11 |
|  | W | 109,833 |  |  |  | 156,691 |  |  |  | 9,434 |  |  |  | 4,478 |
| (*) | The reason for the disposal of stocks at fair value through other comprehensive income is the disposal of stocks acquired through debt-to-equity swaps, among others.

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