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CASH COLLATERAL, REVERSE REPURCHASE AGREEMENTS AND SECURITIES BORROWING AND PAYABLES FROM REPURCHASE AGREEMENTS AND SECURITIES LENDING - Details of the collateral transactions (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
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]      
Financial assets     S/ 164,228,539
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]      
Financial assets S/ 899,435 S/ 659,380  
Financial assets, at fair value S/ 901,377 S/ 654,788  
Instruments issued by the Colombian Government [Member] | 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]      
Description of presentation currency Colombian pesos    
Reverse repurchase agreements and cash collateral on securities borrowed, interest rate 5.61% 6.60%  
Financial assets S/ 550,186 S/ 449,452  
Financial assets, at fair value S/ 550,579 S/ 443,386  
Instruments issued by the Chilean Government [Member] | 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]      
Description of presentation currency Chilean pesos    
Reverse repurchase agreements and cash collateral on securities borrowed, interest rate 0.34% 0.27%  
Financial assets S/ 22,507 S/ 24,624  
Financial assets, at fair value S/ 22,507 S/ 24,628  
Other instruments [Member] | 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, interest rate 4.44% 3.76%  
Financial assets S/ 326,742 S/ 185,304  
Financial assets, at fair value 328,291 186,774  
Not later than three days [Member] | 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]      
Financial assets 261,718 36,637  
Not later than three days [Member] | Instruments issued by the Colombian Government [Member] | 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]      
Financial assets 97,747 0  
Not later than three days [Member] | Instruments issued by the Chilean Government [Member] | 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]      
Financial assets 7,002 24,624  
Not later than three days [Member] | Other instruments [Member] | 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]      
Financial assets 156,969 12,013  
Later than three and not later than thirty days [Member] | 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]      
Financial assets 522,480 559,451  
Later than three and not later than thirty days [Member] | Instruments issued by the Colombian Government [Member] | 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]      
Financial assets 376,043 401,580  
Later than three and not later than thirty days [Member] | Instruments issued by the Chilean Government [Member] | 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]      
Financial assets 15,505 0  
Later than three and not later than thirty days [Member] | Other instruments [Member] | 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]      
Financial assets 130,932 157,871  
Later than thirty days [Member] | 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]      
Financial assets 115,237 63,292  
Later than thirty days [Member] | Instruments issued by the Colombian Government [Member] | 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]      
Financial assets 76,396 47,872  
Later than thirty days [Member] | Instruments issued by the Chilean Government [Member] | 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]      
Financial assets 0 0  
Later than thirty days [Member] | Other instruments [Member] | 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]      
Financial assets S/ 38,841 S/ 15,420