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Securities at fair value through other comprehensive income and securities at amortized cost - Income or loss on equity securities at fair value through other comprehensive income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income or loss on equity securities at fair value through other comprehensive income [Line Items]    
Fair value at the date of disposal ₩ 156,691 ₩ 109,833
Cumulative net gain at the time of disposal 4,478 9,434
Stocks [Member]    
Income or loss on equity securities at fair value through other comprehensive income [Line Items]    
Fair value at the date of disposal 155,004 106,810
Cumulative net gain at the time of disposal 4,467 9,429
Contingent Convertible Bonds [Member]    
Income or loss on equity securities at fair value through other comprehensive income [Line Items]    
Fair value at the date of disposal 1,687 3,023
Cumulative net gain at the time of disposal ₩ 11 ₩ 5