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CASH AND DUE FROM BANKS - Additional Information (Details)
S/ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
PEN (S/)
Dec. 31, 2018
PEN (S/)
Disclosure Of Cash And Cash Equivalents [Line Items]        
Implicit interest rate, domestic 5.01% 5.01% 5.01% 5.01%
Implicit interest rate, foreign 35.06% 35.12% 35.06% 35.12%
Overnight deposit one | S/     S/ 4,280.4 S/ 1,437.8
Interest rate on overnight deposits 1.57%   1.57%  
Description of maturity of overnight deposits maturities at 2 days maturities at 2 days    
US Dollars [Member]        
Disclosure Of Cash And Cash Equivalents [Line Items]        
Overnight deposit one   $ 426.3 S/ 360.0  
Overnight deposit two | $ $ 1,291.6      
Interest rate on overnight deposits 1.00% 2.43% 1.00% 2.43%