v3.26.1
Financial risk management - Summary of the sensitivity analysis of fair value measurement (Detail) - Interest rate risk [member] - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Insurance and reinsurance contracts [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Change in basis points, Increase 100.00%  
Impact on income before taxes, Increase S/ (7,229) S/ (4,958)
Impact on equity, Increase S/ 1,206,193 1,113,771
Change in basis points, Decrease 100.00%  
Impact on income before taxes, Decrease S/ 9,094 6,210
Impact on equity, Decrease S/ (1,469,217) (1,345,914)
Debt instruments [member]    
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, assets [line items]    
Change in basis points, Increase 100.00%  
Impact on income before taxes, Increase S/ (111) (99)
Impact on equity, Increase S/ (979,197) (928,453)
Change in basis points, Decrease 100.00%  
Impact on income before taxes, Decrease S/ 128 115
Impact on equity, Decrease S/ 1,125,978 S/ 1,068,856