v3.26.1
Financial risk management - Additional information - (Detail)
 12 Months Ended
Dec. 31, 2025
PEN (S/)
Sbs
Dec. 31, 2024
PEN (S/)
Sbs
Dec. 31, 2025
USD ($)
Sbs
Dec. 31, 2024
USD ($)
Sbs
Disclosure of provision matrix [line items]        
Financial assets in fixed income instruments S/ 28,173,806,000 S/ 26,857,925,000    
Indirect loans S/ 5,567,722,000 5,068,694,000    
Interest rate risk [member]        
Disclosure of provision matrix [line items]        
Cash legal limit percentage 5.00%   5.00%  
Cash early warning limit percentage 4.00%   4.00%  
Value at risk internal indicator percentage 15.00%   15.00%  
Value at risk early warning indicator percentage 13.00%   13.00%  
Foreign currency [Member]        
Disclosure of provision matrix [line items]        
Indirect loans S/ 3,534,108,000 S/ 2,901,393,000 $ 1,050,880,000 $ 770,827,000
Closing foreign exchange rate | Sbs 3.363 3.764 3.363 3.764
Peru, Nuevos Soles        
Disclosure of provision matrix [line items]        
Financial assets in fixed income instruments S/ 20,387,567,000 S/ 19,356,325,000    
Impulso MyPeru [member]        
Disclosure of provision matrix [line items]        
Payment towards loans and advances 0 2,996,207,000,000    
Loans and advances to customers 1,304,815,000,000 2,780,282,000,000    
Interest income on loans and advances to customers 9,806,000,000 13,155,000,000    
Loan and advance amount covered by government guarantee S/ 914,339,000,000 S/ 1,797,725,000,000    
Top of range [member]        
Disclosure of provision matrix [line items]        
Absolute variation percentage 9.60% 8.00%    
Relative variation percentage 490.70% 473.90%    
Weighted average [member] | Peru, Nuevos Soles        
Disclosure of provision matrix [line items]        
Closing foreign exchange rate | Sbs 3.368 3.77 3.368 3.77
Weighted average [member] | Peru, Nuevos Soles | Peru Currency Ask For Every US Dollar Bid [Member]        
Disclosure of provision matrix [line items]        
Closing foreign exchange rate | Sbs 3.358 3.758 3.358 3.758
Financial Investments [Member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 89.70% 86.90% 89.70% 86.90%
Financial assets in fixed income instruments S/ 735,403,000,000 S/ 939,065,000,000    
Accounts Receivable Insurance Premiums        
Disclosure of provision matrix [line items]        
Expected credit loss rate 97.90% 97.10% 97.90% 97.10%
Direct loans [member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 3.10% 3.40% 3.10% 3.40%
Financial assets in fixed income instruments S/ 132,878,000,000 S/ 158,694,000,000    
Indirect Loans [Member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 0.20% 0.30% 0.20% 0.30%
Financial assets in fixed income instruments S/ 262,916,000,000 S/ 371,372,000,000    
Cash and due from banks [Member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 77.20% 80.80% 77.20% 80.80%
Loans [Member]        
Disclosure of provision matrix [line items]        
Financial assets in fixed income instruments S/ 395,794,000,000 S/ 530,066,000,000    
Loans [Member] | Lower Credit Risk [Member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 83.70% 84.70% 83.70% 84.70%
Loan Portfolio [Member] | Financial assets neither past due nor impaired [member]        
Disclosure of provision matrix [line items]        
Expected credit loss rate 93.60% 92.50% 93.60% 92.50%