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SHARE-BASED COMPENSATION PLANS (Details Textual) - Equity-settled transaction [Member]
S/ in Millions
12 Months Ended
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
PEN (S/)
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 119,840 140,812 140,498
Number of share options outstanding in share-based payment arrangement 260,548 276,011 277,436
Expense from share-based payment transactions with employees S/ 65.5 S/ 62.0 S/ 73.9