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CASH COLLATERAL, REVERSE REPURCHASE AGREEMENTS AND SECURITIES BORROWING AND PAYABLES FROM REPURCHASE AGREEMENTS AND SECURITIES LENDING - Composition of cash collateral, reverse repurchase agreements and securities borrowing (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]      
Reverse repurchase agreements and cash collateral on securities borrowed S/ 4,288,524 S/ 4,082,942 S/ 7,480,420
Cash collateral on repurchase agreements and security lendings [Member]      
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]      
Reverse repurchase agreements and cash collateral on securities borrowed 3,293,837 3,409,890  
Reverse repurchase agreement and security borrowings [Member]      
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]      
Reverse repurchase agreements and cash collateral on securities borrowed 899,435 659,380  
Receivables for short sales [Member]      
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]      
Reverse repurchase agreements and cash collateral on securities borrowed S/ 95,252 S/ 13,672