v3.26.1
Due to banks and correspondents - Disclosure detail of dues to banks and correspondents (Parenthetical) (Detail) - PEN (S/)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Interest payable S/ 116,120,000 S/ 128,047,000
Notional amount 13,275,494,000 13,070,956,000
COFIDE [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations   123,772,000,000
COFIDE [Member] | Currency Repurchase Obligations [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations 450,000,000  
COFIDE [Member] | Peruvian Sovereign Bonds And Certificate Of Deposits [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations S/ 1,331,905,000 S/ 1,632,915,000
COFIDE [Member] | Bottom of range [member] | Currency Repurchase Obligations [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 0.70%  
Borrowings maturity January and April 2026  
COFIDE [Member] | Bottom of range [member] | Peruvian Sovereign Bonds And Certificate Of Deposits [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 4.51% 5.16%
Borrowings maturity January 2026 and April 2026 January 2025 and March 2025
COFIDE [Member] | Bottom of range [member] | Promotional Credit Lines [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 5.81% 5.81%
Borrowings maturity December 2029 December 2029
COFIDE [Member] | Top of range [member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations   S/ 123,857,000
COFIDE [Member] | Top of range [member] | Currency Repurchase Obligations [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations S/ 933,000  
Borrowings Effective Annual Interest Rate 0.92%  
COFIDE [Member] | Top of range [member] | Peruvian Sovereign Bonds And Certificate Of Deposits [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Repurchase obligations S/ 9,147,000 S/ 13,489,000
Borrowings Effective Annual Interest Rate 4.75% 5.46%
COFIDE [Member] | Top of range [member] | Promotional Credit Lines [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 10.14% 11.11%
Borrowings maturity October 2034 October 2034
FMV Loans [Member] | Promotional Credit Lines [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 7.75% 7.75%
FMV Loans [Member] | Bottom of range [member] | Promotional Credit Lines [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 5.00% 5.00%
Borrowings maturity January 2026 January 2025
FMV Loans [Member] | Top of range [member] | Promotional Credit Lines [Member]    
Disclosure Of Dues To Banks And Correspondents [Line Items]    
Borrowings Effective Annual Interest Rate 8.30% 8.30%
Borrowings maturity July 2050 July 2053