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v3.26.1

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

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