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Net interest income - Summary of net interest income (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Interest income: |  |  |
Cash and due from banks at amortized cost | ₩ 781,197 | ₩ 780,046 | ₩ 590,831
Deposits at FVTPL | 1,305 | 133 | 0
Securities at FVTPL | 1,499,121 | 1,693,064 | 1,396,409
Securities at FVOCI | 2,888,284 | 2,744,083 | 2,357,108
Securities at amortized cost | 1,044,061 | 1,101,721 | 1,062,110
Loans at amortized cost | 21,311,377 | 22,410,903 | 21,676,818
Loans at FVTPL | 89,239 | 100,122 | 120,815
Insurance finance interest income | 232,272 | 219,409 | 240,534
Others | 141,945 | 159,857 | 134,586
Interest income | 27,988,801 | 29,209,338 | 27,579,211
Interest expense: |  |  |
Deposits | (9,202,286) | (10,220,774) | (9,790,811)
Financial liabilities designated at FVTPL | (14,792) | (13,292) | (9,804)
Borrowings | (1,534,773) | (1,862,406) | (1,895,913)
Debt securities issued | (3,332,621) | (3,408,678) | (2,735,421)
Insurance finance interest expense | (1,885,044) | (1,901,536) | (1,945,318)
Others | (324,829) | (400,350) | (384,022)
Interest expense | (16,294,345) | (17,807,036) | (16,761,289)
Net interest income | ₩ 11,694,456 | ₩ 11,402,302 | ₩ 10,817,922

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