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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
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.