Subsidiaries - Additional information (Detail)	12 Months Ended
Subsidiaries - Additional information (Detail)	Dec. 31, 2025 PEN (S/) Offices	Dec. 31, 2024 PEN (S/) Offices	Dec. 31, 2023 PEN (S/)	Dec. 31, 2022 PEN (S/)
Disclosure of subsidiaries [line items]
Number of offices held \| Offices	146	149
Fair values of properties contributed	S/ 1,540,615,000	S/ 1,381,788,000	S/ 1,298,892,000	S/ 1,287,717,000
Interseguro Compaa de Seguros SA and Subsidiaries [Member]
Disclosure of subsidiaries [line items]
Fair values of properties contributed	S/ 95,328,000	S/ 89,124,000
Interseguro Compaa de Seguros SA and Subsidiaries [Member] \| Negocios e Inmuebles SA and Holding Retail Per SA [Member]
Disclosure of subsidiaries [line items]
Percentage of ownership interest in subsidiary	8.50%	8.50%
Interfondos SA Fund Management Company [Member]
Disclosure of subsidiaries [line items]
Percentage of ownership interest in subsidiary	99.99%	99.99%

The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.