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OTHER ASSETS AND OTHER LIABILITIES (Details 4) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Other Assets And Other Liabilities [Abstract]      
Balance at the beginning of the year S/ 275,841 S/ 296,339 S/ 196,261
Provision, Note 28 42,236 29,023 28,093
Increase (decrease), net 24,273 (49,521) 71,985
Balances S/ 342,350 S/ 275,841 S/ 296,339