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TRANSACTIONS WITH RELATED PARTIES - Group's key executives' compensation (including the related income taxes assumed by the Group) (Details) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Related Party Explanatory [Line Items]      
Key management personnel compensation S/ 66,141 S/ 67,096 S/ 59,023
Directors' fees [Member]      
Disclosure Of Related Party Explanatory [Line Items]      
Key management personnel compensation 6,766 5,665 5,318
Remunerations [Member]      
Disclosure Of Related Party Explanatory [Line Items]      
Key management personnel compensation 32,218 34,118 27,133
Stock Awards [Member]      
Disclosure Of Related Party Explanatory [Line Items]      
Key management personnel compensation S/ 27,157 S/ 27,313 S/ 26,572