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INVESTMENTS - Government Treasury Bonds (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading S/ 625,762 S/ 518,488
Available-for-sale investments [Member]    
Disclosure of Investments [Line Items]    
Financial assets at fair value through profit or loss, classified as held for trading 6,698,076 5,190,748
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 5,959,066 4,706,121
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 72,516 90,370
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 61,009 137,936
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 391,475 82,477
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 40,646 54,327
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/ 173,364 S/ 119,517