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FINANCIAL RISK MANAGEMENT - VAR by Risk Type (Details) - Price Risk [Member] - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Consolidated VaR by Type Of Asset [Line Items]    
Value at risk S/ 11,301 S/ 10,426
Interest Rate Risk [Member]    
Disclosure Of Consolidated VaR by Type Of Asset [Line Items]    
Value at risk 9,274 9,527
Price Risk [Member]    
Disclosure Of Consolidated VaR by Type Of Asset [Line Items]    
Value at risk 7,809 4,476
Volatility Risk [Member]    
Disclosure Of Consolidated VaR by Type Of Asset [Line Items]    
Value at risk 463 10
Diversification effect [member]    
Disclosure Of Consolidated VaR by Type Of Asset [Line Items]    
Value at risk S/ (6,245) S/ (3,587)