v3.26.1
Bonds, notes and other obligations - Summary of bonds, notes and other obligations (Detail)
S/ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
PEN (S/)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
PEN (S/)
Disclosure of detailed information about borrowings [line items]      
Amount issued S/ 13,275,494   S/ 13,070,956
Borrowings 5,590,408   6,075,433
Interest payable S/ 116,120   128,047
Six Point Six Two Five Percentage Subordinated Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rate 6.625% 6.625%  
Annual interest rate, basis since that date, the interest rate changes to 5-year U.S. Treasury plus 365.2 basis points.    
Local Issuances [Member] | Subordinated Bonds Third Program Fourth Single Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interseguro    
Annual interest rate 7.09375% 7.09375%  
Interest Payment Semi-annually    
Borrowings Maturity 2034    
Amount issued | $   $ 34,780  
Borrowings S/ 116,965   130,912
Local Issuances [Member] | Subordinated Bonds Third Program Third Single Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interseguro    
Annual interest rate 4.84375% 4.84375%  
Interest Payment Semi-annually    
Borrowings Maturity 2030    
Amount issued | $   $ 25,000  
Borrowings     94,100
Local Issuances [Member] | Subordinated Bonds Third Program [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings S/ 116,965   225,012
Local Issuances [Member] | Negotiable Certificates Of Deposit Second Program First D Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 4.5625% 4.5625%  
Interest Payment Annual    
Borrowings Maturity 2026    
Amount issued S/ 106,650    
Borrowings S/ 104,107    
Local Issuances [Member] | Negotiable Certificates Of Deposit Second Program First E Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 4.46875% 4.46875%  
Interest Payment Annual    
Borrowings Maturity 2026    
Amount issued S/ 101,250    
Borrowings S/ 98,127    
Local Issuances [Member] | Negotiable Certificates of Deposit Second Program First A Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 5.21875% 5.21875%  
Interest Payment Annual    
Borrowings Maturity 2025    
Amount issued S/ 112,964    
Borrowings     110,010
Local Issuances [Member] | Negotiable Certificates of Deposit Second Program First B Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 4.9375% 4.9375%  
Interest Payment Annual    
Borrowings Maturity 2025    
Amount issued S/ 138,435    
Borrowings     133,852
Local Issuances [Member] | Negotiable Certificates of Deposit Second Program First C Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 4.59375% 4.59375%  
Interest Payment Annual    
Borrowings Maturity 2025    
Amount issued S/ 102,000    
Borrowings     97,643
Local Issuances [Member] | Negotiable Certificates of Deposit Second Program [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings S/ 202,234   341,505
Local Issuances [Member] | Corporate Bonds Fourth Program First A Series      
Disclosure of detailed information about borrowings [line items]      
Issuer Interseguro    
Annual interest rate 6.75% 6.75%  
Interest Payment Semi-annually    
Borrowings Maturity 2034    
Amount issued | $   $ 28,706  
Borrowings S/ 96,538   108,049
Local Issuances [Member] | Corporate Bonds Fourth Program First B Series      
Disclosure of detailed information about borrowings [line items]      
Issuer Interseguro    
Annual interest rate 6.50% 6.50%  
Interest Payment Semi-annually    
Borrowings Maturity 2035    
Amount issued | $   $ 18,217  
Borrowings S/ 61,264    
Local Issuances [Member] | Corporate Bonds Fourth Program First C Series      
Disclosure of detailed information about borrowings [line items]      
Issuer Interseguro    
Annual interest rate 6.1875% 6.1875%  
Interest Payment Semi-annually    
Borrowings Maturity 2035    
Amount issued | $   $ 19,386  
Borrowings S/ 65,195    
Local Issuances [Member] | Corporate Bonds Second Program fifth A Series [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate, basis 3.41% + VAC    
Interest Payment Semi-annually    
Borrowings Maturity 2029    
Amount issued S/ 150,000    
Borrowings 150,000   150,000
Local Issuances [Member] | Corporate Bonds Fourth Program [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 222,997   108,049
Local Issuances [Member] | Corporate Bonds Second Program [member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings 692,196   824,566
International Issuances [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings S/ 4,782,092   5,122,820
International Issuances [Member] | Five Percent Corporate Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 5.00% 5.00%  
Interest Payment Semi-annually    
Borrowings Maturity 2026    
Amount issued S/ 312,000    
Borrowings S/ 311,910   311,788
International Issuances [Member] | Three Point Two Five Zero Percent Corporate Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 3.25% 3.25%  
Interest Payment Semi-annually    
Borrowings Maturity 2026    
Amount issued S/ 400,000    
Borrowings S/ 1,343,800   1,501,894
International Issuances [Member] | Senior Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer IFS    
Annual interest rate 4.125% 4.125%  
Interest Payment Semi-annually    
Borrowings Maturity 2027    
Amount issued S/ 300,000    
Borrowings S/ 950,200   1,062,514
International Issuances [Member] | Four Percent Subordinated Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 4.00% 4.00%  
Interest Payment Semi-annually    
Borrowings Maturity 2030    
Amount issued S/ 300,000    
Borrowings     1,124,502
International Issuances [Member] | Seven Point Six Two Five Percentage Subordinated Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 7.625% 7.625%  
Interest Payment Semi-annually    
Borrowings Maturity 2034    
Amount issued S/ 300,000    
Borrowings S/ 1,004,174   1,122,122
International Issuances [Member] | Six Point Three Nine Seven Percent Subordinated Bonds [Member]      
Disclosure of detailed information about borrowings [line items]      
Issuer Interbank    
Annual interest rate 6.397% 6.397%  
Interest Payment Semi-annually    
Borrowings Maturity 2035    
Amount issued S/ 350,000    
Borrowings 1,172,008    
Local and International Issuances [Member]      
Disclosure of detailed information about borrowings [line items]      
Borrowings S/ 5,474,288   S/ 5,947,386