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Shareholders' equity, net - Investment shares (Details)
S/ in Thousands, $ in Thousands
Dec. 31, 2020
PEN (S/)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares outstanding 350,056,012 350,056,012  
Investment shares | $   $ 791 $ 791
Total investment shares [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares outstanding 271,677 271,677  
Investment shares S/ 2,717 $ 791  
Other reserves of equity [member] | investment shares [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares outstanding 744,640 744,640  
Investment shares S/ 7,447 $ 2,161  
Other reserves of equity [member] | Treasury investment shares [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares outstanding 472,963 472,963  
Investment shares S/ (4,730) $ (1,370)