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Provision for credit loss allowance (Tables)
12 Months Ended
Dec. 31, 2025
Provision for allowance for credit loss [Abstract]  
Summary of Provision for credit loss allowance
Provision for credit loss allowance on financial assets for the years ended December 31, 2023, 2024 and 2025 are as follows:
 
    
2023
    
2024
    
2025
 
Allowance provided:
        
Loans at amortized cost
  
W
(2,114,442      (1,862,013      (2,014,137
Other financial assets at amortized cost
     (90,770      (113,662      (70,035
Securities at FVOCI
     (2,271      —         (25,915
Unused credit line and financial guarantee
     (37,156      (41,910      —   
  
 
 
    
 
 
    
 
 
 
     (2,244,639      (2,017,585      (2,110,087
  
 
 
    
 
 
    
 
 
 
Allowance reversed:
        
Securities at FVOCI
     —         2,699        —   
Securities at amortized cost
     136        1,612        1,243  
Unused credit line and financial guarantee
     —         —         105,879  
     
 
 
    
 
 
 
     136        4,311        107,122  
  
 
 
    
 
 
    
 
 
 
  
W
(2,244,503      (2,013,274      (2,002,965