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FINANCIAL RISK MANAGEMENT - Allowances for Direct and Indirect Loan Losses and its Estimations (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial risks management [Line Items]        
Allowance account for credit losses of financial assets S/ 5,507,759 S/ 5,314,531 S/ 4,943,008 S/ 4,416,692
Optimistic [Member]        
Disclosure of financial risks management [Line Items]        
Allowance account for credit losses of financial assets 5,426,608 5,218,142    
Base Case [Member]        
Disclosure of financial risks management [Line Items]        
Allowance account for credit losses of financial assets 5,509,729 5,308,346    
Pessimistic [Member]        
Disclosure of financial risks management [Line Items]        
Allowance account for credit losses of financial assets S/ 5,584,965 S/ 5,422,882