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DEPOSITS AND OBLIGATIONS - time deposits classified by maturity (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers S/ 32,853,576 S/ 30,426,744
Overdue 90 days [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 14,674,773 14,771,836
From 3 months to 1 year [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 8,975,269 8,177,435
From 1 to 3 years [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 6,096,891 4,506,612
From 3 to 5 years [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 819,446 846,696
More than 5 years [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers S/ 2,287,197 S/ 2,124,165