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CASH AND DUE FROM BANKS (Details textual)
S/ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Disclosure Of Cash And Cash Equivalents [Line Items]        
Implicit interest rate, domestic 5.01% 5.00% 5.01% 5.00%
Implicit interest rate, foreign 35.12% 32.40% 35.12% 32.40%
Overnight deposit one S/ 1,437.8 S/ 3,067.8    
Interest rate on overnight deposits 2.43% 2.00% 2.43% 2.00%
Description of maturity of overnight deposits maturities at 2 days maturities at 5 days    
US Dollars [Member]        
Disclosure Of Cash And Cash Equivalents [Line Items]        
Overnight deposit one | $     $ 426.3 $ 946.6
Overnight deposit two   S/ 300.0    
Interest rate on overnight deposits   1.41%   1.41%