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DEPOSITS AND OBLIGATIONS (Details 2) - PEN (S/)
S/ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers S/ 30,426,744 S/ 30,184,314
Up to 3 months    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 14,771,836 15,152,619
From 3 months to 1 year    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 8,177,435 8,735,918
From 1 to 3 years [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 4,506,612 3,478,314
From 3 to 5 years [Member]    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers 846,696 702,962
Over 5 years    
Disclosure of Deposits and Obligations [Line Items]    
Balances on demand deposits from customers S/ 2,124,165 S/ 2,114,501