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CASH COLLATERAL, REVERSE REPURCHASE AGREEMENTS AND SECURITIES BORROWING AND PAYABLES FROM REPURCHASE AGREEMENTS AND SECURITIES LENDING (Details Textual)
S/ in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
PEN (S/)
Dec. 31, 2017
USD ($)
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/ 4,082,942 [1] S/ 7,480,420 [1]   S/ 7,480,420  
Borrowings, interest rate basis Treasury of the United States of America's plus 20 basis points          
Credit derivative, nominal amount   S/ 64,949,859 S/ 65,818,565      
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, 2018, said operations accrue interest at fixed and variable rates between 0.09 percent and 7.20 percent and between Libor 3M + 0.35 percent and Libor 6M + 1.90 percent, respectively, between 1.00 percent and 7.20 percent and between Libor 3M + 0.35 percent and Libor 6M + 1.90 percent, respectively, at December 31, 2017      
Cash flow hedges [member] | 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   S/ 506,000 S/ 486,200 $ 150.0   $ 150.0
Cash flow hedges [member] | 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   236,100 226,900 70.0   70.0
Cash flow hedges [member] | 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   151,800 145,800 45.0   45.0
Cash flow hedges [member] | 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   84,300 81,000 25.0   25.0
Cash flow hedges [member] | 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   269,800 259,300 80.0   80.0
US Dollar [Member] | Central Reserve Bank of Peru [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   3,100,500 6,681,200 $ 919.2   $ 2,061.5
Borrowings   S/ 2,948,500 S/ 6,575,800      
[1] The balances of financial instruments at December 31, 2018 have been prepared in accordance with IFRS 9; the balances of the previous period have not been restated, see Note 3(a)(i).