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Securities at fair value through other comprehensive income and securities at amortized cost - Changes in allowance for credit loss of securities at fair value through other comprehensive income and securities at amortized cost (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Debt securities at fair value through other comprehensive income |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | ₩ 38,346 | ₩ 42,477
Transfer (from) to 12-month expected credit loss |  | 0 | 0
Transfer (from) to life time expected credit loss |  | 0 | 0
Provision (Reversal) |  | 25,916 | (2,699)
Disposal and others | [1] | (3,961) | (1,432)
Ending balance |  | 60,301 | 38,346
Debt securities at fair value through other comprehensive income | 12-month expected credit losses |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | 38,250 | 41,568
Transfer (from) to 12-month expected credit loss |  | 17 | 14
Transfer (from) to life time expected credit loss |  | (3) | 0
Provision (Reversal) |  | 23,479 | (2,279)
Disposal and others | [1] | (3,981) | (1,053)
Ending balance |  | 57,762 | 38,250
Debt securities at fair value through other comprehensive income | Lifetime expected credit losses |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | 96 | 909
Transfer (from) to 12-month expected credit loss |  | (17) | (14)
Transfer (from) to life time expected credit loss |  | 3 | 0
Provision (Reversal) |  | 2,437 | (420)
Disposal and others | [1] | 20 | (379)
Ending balance |  | 2,539 | 96
Debt securities at amortized cost |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | 10,188 | 11,423
Transfer (from) to 12-month expected credit loss |  | 0 | 0
Transfer (from) to life time expected credit loss |  | 0 | 0
Provision (Reversal) |  | (1,243) | (1,612)
Disposal and others | [1] | (254) | 377
Ending balance |  | 8,691 | 10,188
Debt securities at amortized cost | 12-month expected credit losses |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | 10,137 | 11,283
Transfer (from) to 12-month expected credit loss |  | 0 | 0
Transfer (from) to life time expected credit loss |  | 0 | 0
Provision (Reversal) |  | (1,196) | (1,515)
Disposal and others | [1] | (250) | 369
Ending balance |  | 8,691 | 10,137
Debt securities at amortized cost | Lifetime expected credit losses |  |  |
Changes in the allowance for credit losses [Line Items] |  |  |
Beginning balance |  | 51 | 140
Transfer (from) to 12-month expected credit loss |  | 0 | 0
Transfer (from) to life time expected credit loss |  | 0 | 0
Provision (Reversal) |  | (47) | (97)
Disposal and others | [1] | (4) | 8
Ending balance |  | ₩ 0 | ₩ 51
[1] | Includes the effects of restructuring of loans, debt-to-equity swaps, and changes in foreign exchange rates, among others.

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