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INVESTMENTS (Details 3) - PEN (S/)
S/ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading S/ 518,488 S/ 508,103
Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 5,190,748 4,640,548
Peruvian sovereign bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 4,706,121 4,364,172
Bolivian sovereign bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 90,370 106,461
Colombian sovereign bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 137,936 58,381
U.S. Federal agency bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading   55,875
Other bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 136,804 S/ 55,659
Chilean sovereign bonds [Member] | Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading S/ 119,517