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TRANSACTIONS WITH RELATED PARTIES - Additional Information (Details) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Related Party Explanatory [Line Items]    
Allowance for doubtful debts related to outstanding balances of related party transaction S/ 12,600 S/ 13,700
Amounts receivable, related party transactions S/ 1,657,206 S/ 2,594,712
Related parties [member]    
Disclosure Of Related Party Explanatory [Line Items]    
Borrowings, maturity had maturities between January 2020 and December 2029 maturities where between January 2019 and December 2028
Borrowings, interest rate 6.21% 6.46%
Employees, directors, key management and family [Member]    
Disclosure Of Related Party Explanatory [Line Items]    
Amounts receivable, related party transactions S/ 1,003,200 S/ 1,031,700