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TAX SITUATION - tax rates (Details) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of tax situation [Line Items]      
Rate 29.50% 29.50% 29.50%
Number of Units of Tax Value S/ 120    
Tax Vaue amount S/ 4,200    
Up to 1 year [Member]      
Disclosure of tax situation [Line Items]      
Rate 32.00%    
Surcharge Rate 4.00%    
2021      
Disclosure of tax situation [Line Items]      
Rate 31.00%    
Surcharge Rate 3.00%    
2022      
Disclosure of tax situation [Line Items]      
Rate 30.00%    
Surcharge Rate 3.00%    
As of 2023      
Disclosure of tax situation [Line Items]      
Rate 30.00%