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Loans at amortized cost, etc. - Changes in deferred loan origination costs and fees (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in deferred loan origination costs [Abstract]    
Beginning balance ₩ 645,569 ₩ 505,986
Loan origination 306,840 344,963
Amortization, etc. (224,660) (205,380)
Ending balance ₩ 727,749 ₩ 645,569