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SHARE-BASED COMPENSATION PLANS (Details)
12 Months Ended
Dec. 31, 2019
PEN (S/)
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Share based compensation plans [Line Items]      
Number of share options outstanding in share-based payment arrangement 246,931 260,548 276,011
Equity-settled transaction [Member]      
Share based compensation plans [Line Items]      
Description of vesting requirements for share-based payment arrangement awarded shares are liberated in the three following years for up to 33.3 percent of the shares granted in each of the three previous years    
Number of share options granted in share-based payment arrangement 116,594 119,840 140,812
Number of share options outstanding in share-based payment arrangement 246,931 260,548 276,011
Expense from share-based payment transactions with employees S/ 120,100,000 S/ 106,900,000 S/ 104,200,000