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CASH COLLATERAL, REVERSE REPURCHASE AGREEMENTS AND SECURITIES BORROWING AND PAYABLES FROM REPURCHASE AGREEMENTS AND SECURITIES LENDING - Additional Information (Details)
S/ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2018
PEN (S/)
Jan. 01, 2018
PEN (S/)
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
Credit derivative, nominal amount     69,720,506 56,935,229  
Central Reserve Bank of Peru [Member] | US Dollars [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 $ 844.5 $ 919.2 2,798,700 3,100,500  
Borrowings     2,800,400 2,948,500  
Repurchase Agreements [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Borrowings, interest rate basis At December 31, 2019, said operations accrue interest at fixed and variable rates between 2.6 percent and 7.20 percent and between Libor 3M + 0.80 percent and Libor 6M + 1.90 percent, respectively, between 0.09 percent and 7.20 percent and between Libor 3M + 0.35 percent and Libor 6M + 1.90 percent, respectively, at December 31, 2018      
Cash flow hedges | Interest rate swap contract seven [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Credit derivative, nominal amount   $ 150.0   506,000  
Cash flow hedges | Cross currency swap contract one [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Credit derivative, nominal amount $ 70.0 70.0 232,000 236,100  
Cash flow hedges | Cross currency swap contract two [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Credit derivative, nominal amount 45.0 45.0 149,100 151,800  
Cash flow hedges | Cross currency swap contract three [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Credit derivative, nominal amount 25.0 25.0 82,900 84,300  
Cash flow hedges | Cross currency swap and interest rate swap contract [Member]          
Disclosure of Cash Collateral, Reverse Repurchase Agreements And Securities Borrowings And Payables From Repurchase Agreements And Security Lendings [Line Items]          
Credit derivative, nominal amount $ 80.0 $ 80.0 S/ 265,100 S/ 269,800