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Operating revenue
 12 Months Ended
Dec. 31, 2025
Revenue [abstract]  
Operating revenue
35.
Operating revenue
Operating revenue for the years ended December 31, 2023, 2024 and 2025 are as follows:
 
    
2023
     
2024
     
2025
  
Interest income
   
W
 27,579,211        29,209,338        27,988,801  
Fees and commission income
      4,175,243        4,295,366        4,564,323  
Insurance income
      2,899,599        3,116,553        3,364,322  
Reinsurance income
      44,985        73,578        202,299  
Insurance finance income
      143,064        202,363        44,087  
Dividend income
      181,486        239,097        209,681  
Net gain on financial instruments measured at FVTPL
      4,254,811        4,264,126        4,823,409  
Gain on trading derivatives measured at FVTPL
      17,208,758        22,397,247        17,568,108  
Net gain on financial instruments designated at FVTPL
      438,709        252,924        232,193  
Net gain on foreign currency transaction
      3,201,023        8,084,564        3,683,224  
Net gain on disposal of securities at FVOCI
      50,793        197,708        287,564  
Net gain on disposal of securities at amortized cost
      358        —         2  
Reversal of credit loss allowance
      136        4,311        107,122  
Gain related to hedging derivatives
      422,074        753,798        607,993  
Other operating income
      732,379        973,306        998,832  
  
 
 
     
 
 
     
 
 
  
  
W
 61,332,629        74,064,279        64,681,960