v3.26.1
Earnings per share (Detail) - PEN (S/)
S/ / shares in Units, shares in Thousands, S/ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Earnings per share [line items]      
Opening Balance 113,288 114,480 115,418
Sale of treasury stock   0 1
Purchase of treasury stock (1,575) (193) (407)
Closing Balance 111,713 114,287 115,012
IFS's shareholders S/ 1,932,470 S/ 1,300,078 S/ 1,072,728
Basic earnings per share attributable to IFS's shareholders (Soles) S/ 17.299 S/ 11.376 S/ 9.327
Diluted earnings per share attributable to IFS's shareholders (Soles) S/ 17.299 S/ 11.376 S/ 9.327
Outstanding shares [member]      
Earnings per share [line items]      
Opening Balance 113,288 114,480 115,418
Sale of treasury stock   2 1
Purchase of treasury stock (2,206) (1,194) (939)
Closing Balance 111,082 113,288 114,480
Sharesconsidered in computation [member]      
Earnings per share [line items]      
Opening Balance 113,288 114,480 115,418
Sale of treasury stock   2 1
Purchase of treasury stock (2,206) (1,194) (939)
Closing Balance 111,082 113,288 114,480