v3.26.1
Financial investments - Summary of debt instruments measured at fair value through other comprehensive income (Detail) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of financial assets [line items]    
Accrued interest S/ 28,173,806 S/ 26,857,925
Estimated fair value 21,662,651 20,724,892
Debt instruments measured at fair value through other comprehensive income [member]    
Disclosure of financial assets [line items]    
Amortized cost 21,706,152 21,490,820
Unrealized gross amount - Gains 414,319 143,421
Unrealized gross amount - Losses (821,074) (1,256,436)
Accrued interest 363,254 347,087
Estimated fair value 21,299,397 20,377,805
Debt instruments measured at fair value through other comprehensive income [member] | Corporate, leasing and subordinated bonds [member]    
Disclosure of financial assets [line items]    
Amortized cost 9,667,248 9,867,060
Unrealized gross amount - Gains 213,688 111,866
Unrealized gross amount - Losses (679,257) (805,981)
Estimated fair value S/ 9,201,679 S/ 9,172,945
Debt instruments measured at fair value through other comprehensive income [member] | Corporate, leasing and subordinated bonds [member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 3.09% 2.20%
Annual effective interest rates - Foreign 3.23% 3.70%
Debt instruments measured at fair value through other comprehensive income [member] | Corporate, leasing and subordinated bonds [member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 41.26% 14.00%
Annual effective interest rates - Foreign 18.64% 10.86%
Debt instruments measured at fair value through other comprehensive income [member] | Sovereign bonds of the republic of peru [member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 8,855,018 S/ 8,331,426
Unrealized gross amount - Gains 183,759 24,387
Unrealized gross amount - Losses (128,769) (410,536)
Estimated fair value S/ 8,910,008 S/ 7,945,277
Debt instruments measured at fair value through other comprehensive income [member] | Sovereign bonds of the republic of peru [member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 2.08% 2.81%
Annual effective interest rates - Foreign 0.00% 0.00%
Debt instruments measured at fair value through other comprehensive income [member] | Sovereign bonds of the republic of peru [member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 6.58% 7.12%
Annual effective interest rates - Foreign 0.00% 0.00%
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable certificates of deposit issued by the Central Reserve Bank of Peru BCRP [member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 2,057,974 S/ 2,113,571
Unrealized gross amount - Gains 15 370
Unrealized gross amount - Losses (297) (17)
Estimated fair value S/ 2,057,692 S/ 2,113,924
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable certificates of deposit issued by the Central Reserve Bank of Peru BCRP [member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 3.96% 4.51%
Annual effective interest rates - Foreign 0.00% 0.00%
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable certificates of deposit issued by the Central Reserve Bank of Peru BCRP [member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 4.04% 4.68%
Annual effective interest rates - Foreign 0.00% 0.00%
Debt instruments measured at fair value through other comprehensive income [member] | Global bonds of the republic of peru [member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 550,343 S/ 548,697
Unrealized gross amount - Gains 5,424 0
Unrealized gross amount - Losses (7,727) (27,058)
Estimated fair value S/ 548,040 S/ 521,639
Debt instruments measured at fair value through other comprehensive income [member] | Global bonds of the republic of peru [member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 3.96% 5.00%
Debt instruments measured at fair value through other comprehensive income [member] | Global bonds of the republic of peru [member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 10.58% 6.14%
Debt instruments measured at fair value through other comprehensive income [member] | Bonds guaranteed by the peruvian government [member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 473,317 S/ 554,359
Unrealized gross amount - Gains 11,098 6,798
Unrealized gross amount - Losses (1,062) (4,603)
Estimated fair value S/ 483,353 S/ 556,554
Debt instruments measured at fair value through other comprehensive income [member] | Bonds guaranteed by the peruvian government [member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 3.35% 3.65%
Annual effective interest rates - Foreign 5.66% 6.37%
Debt instruments measured at fair value through other comprehensive income [member] | Bonds guaranteed by the peruvian government [member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 4.30% 4.74%
Annual effective interest rates - Foreign 6.64% 7.22%
Debt instruments measured at fair value through other comprehensive income [member] | Treasury Bonds Of The United States Of America [Member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 62,364 S/ 57,607
Unrealized gross amount - Gains 81 0
Unrealized gross amount - Losses (2,171) (5,082)
Estimated fair value S/ 60,274 S/ 52,525
Debt instruments measured at fair value through other comprehensive income [member] | Treasury Bonds Of The United States Of America [Member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 3.84% 4.46%
Debt instruments measured at fair value through other comprehensive income [member] | Treasury Bonds Of The United States Of America [Member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 4.84% 4.53%
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of The United States of Mexico [Member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 26,562 S/ 18,100
Unrealized gross amount - Gains 165 0
Unrealized gross amount - Losses (1,727) (3,159)
Estimated fair value S/ 25,000 S/ 14,941
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of The United States of Mexico [Member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 4.98% 6.51%
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of The United States of Mexico [Member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00% 0.00%
Annual effective interest rates - Foreign 5.62% 6.51%
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of the Republic of Chile    
Disclosure of financial assets [line items]    
Amortized cost S/ 11,357  
Unrealized gross amount - Gains 87  
Unrealized gross amount - Losses (64)  
Estimated fair value S/ 11,380  
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of the Republic of Chile | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00%  
Annual effective interest rates - Foreign 4.13%  
Debt instruments measured at fair value through other comprehensive income [member] | Global Bonds of the Republic of Chile | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 0.00%  
Annual effective interest rates - Foreign 4.55%  
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable Certificates of Deposit from financial institutions [Member]    
Disclosure of financial assets [line items]    
Amortized cost S/ 1,969  
Unrealized gross amount - Gains 2  
Unrealized gross amount - Losses 0  
Estimated fair value S/ 1,971  
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable Certificates of Deposit from financial institutions [Member] | Bottom of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 5.03%  
Annual effective interest rates - Foreign 0.00%  
Debt instruments measured at fair value through other comprehensive income [member] | Negotiable Certificates of Deposit from financial institutions [Member] | Top of range [member]    
Disclosure of financial assets [line items]    
Annual effective interest rates - Domestic 5.03%  
Annual effective interest rates - Foreign 0.00%