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INVESTMENTS - Balance of investments, by maturity groupings (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Financial assets at fair value through profit or loss [abstract]      
Financial assets     S/ 164,228,539
At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets S/ 3,845,791 S/ 3,507,576  
At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 25,949,612    
Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 3,399,133    
Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   24,981,013  
Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   4,069,015  
Overdue 90 days [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 237,624 318,648  
Overdue 90 days [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 2,420,464    
Overdue 90 days [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 9,969    
Overdue 90 days [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   4,280,152  
Overdue 90 days [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   372,525  
From 3 months to 1 year [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 269,199 197,829  
From 3 months to 1 year [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 6,694,486    
From 3 months to 1 year [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 908,271    
From 3 months to 1 year [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   5,842,026  
From 3 months to 1 year [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   208,812  
From 1 to 3 years [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 472,215 485,333  
From 1 to 3 years [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 2,155,053    
From 1 to 3 years [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 42,440    
From 1 to 3 years [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   2,145,494  
From 1 to 3 years [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   1,094,660  
From 3 to 5 years [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 289,393 152,083  
From 3 to 5 years [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 2,961,767    
From 3 to 5 years [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 690,289    
From 3 to 5 years [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   1,722,051  
From 3 to 5 years [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   273,343  
More than 5 years [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 1,029,883 871,020  
More than 5 years [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 11,138,643    
More than 5 years [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 1,748,164    
More than 5 years [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   10,341,820  
More than 5 years [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   2,119,675  
Without maturity [Member] | At fair value through profit or loss      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 1,547,477 1,482,663  
Without maturity [Member] | At fair value through other comprehensive income [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets 579,199    
Without maturity [Member] | Amortized cost [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets S/ 0    
Without maturity [Member] | Available for sale [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   649,470  
Without maturity [Member] | Held to maturity [Member]      
Financial assets at fair value through profit or loss [abstract]      
Financial assets   S/ 0