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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis of the U.S.Dollar (Details) - Currency risk [member] - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Devalualtion at 5 in US Dollar [Member]    
disclosure of detailed information about assets and liabilities by currencies at the free market exchnage rates [Line Items]    
Sensitivity Analysis, Percent Change In Currency 5.00% 5.00%
Sensitivity Analysis, change in non-trading monetary assets and liabilities S/ 7,142 S/ 47,559
Devalualtion at 10 in US Dollar [Member]    
disclosure of detailed information about assets and liabilities by currencies at the free market exchnage rates [Line Items]    
Sensitivity Analysis, Percent Change In Currency 10.00% 10.00%
Sensitivity Analysis, change in non-trading monetary assets and liabilities S/ 13,635 S/ 90,795
Revaluation In 5 In US Dollar [Member]    
disclosure of detailed information about assets and liabilities by currencies at the free market exchnage rates [Line Items]    
Sensitivity Analysis, Percent Change In Currency 5.00% 5.00%
Sensitivity Analysis, change in non-trading monetary assets and liabilities S/ (7,894) S/ (52,566)
Revaluation In 10 In US Dollar [Member]    
disclosure of detailed information about assets and liabilities by currencies at the free market exchnage rates [Line Items]    
Sensitivity Analysis, Percent Change In Currency 10.00% 10.00%
Sensitivity Analysis, change in non-trading monetary assets and liabilities S/ (16,665) S/ (110,972)