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TRANSACTIONS WITH RELATED PARTIES - Group holds interests in various funds managed by certain of the Group's subsidiaries (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Disclosure of financial assets [line items]      
Financial assets     S/ 164,228,539
Investment funds      
Disclosure of financial assets [line items]      
Financial assets S/ 249,045 S/ 212,016  
Mutual funds - Bolivianos [Member] | Investment funds      
Disclosure of financial assets [line items]      
Financial assets 126,722 104,596  
Mutual funds - Soles [Member] | Investment funds      
Disclosure of financial assets [line items]      
Financial assets 59,934 18,394  
Mutual funds - U.S. dollars [Member] | Investment funds      
Disclosure of financial assets [line items]      
Financial assets 38,149 76,887  
Mutual funds - Colombian pesos [Member] | Investment funds      
Disclosure of financial assets [line items]      
Financial assets 17,475 5,201  
Mutual funds - Chilean pesos [Member] | Investment funds      
Disclosure of financial assets [line items]      
Financial assets 6,765 6,938  
Restricted mutual funds [Member]      
Disclosure of financial assets [line items]      
Financial assets S/ 460,086 S/ 407,350