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OTHER ASSETS AND OTHER LIABILITIES - The movement of the provision for sundry risks (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OTHER ASSETS AND OTHER LIABILITIES      
Balance at the beginning of the year S/ 342,350 S/ 275,841 S/ 296,339
Provision, Note 29 27,272 42,236 29,023
Increase (decrease), net (9,769) 24,273 (49,521)
Balances S/ 359,853 S/ 342,350 S/ 275,841