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Net interest income
 12 Months Ended
Dec. 31, 2025
Interest Income Expense Net Disclosure [Abstract]  
Net interest income
36.
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