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COMMISSIONS AND FEES (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure OfFee And Commission Income Expense Explanatory [Line Items]      
Maintenance of accounts, transfers and credit and debit card services S/ 1,214,365 S/ 1,251,935 S/ 1,146,082
Funds and equity management 644,038 505,215 467,558
Contingent loans and foreign trade fees 360,798 279,211 260,704
Commissions for banking services 270,784 290,855 202,863
Collection services 234,754 235,369 331,885
Brokerage, securities and custody services 108,333 142,288 166,581
Penalty commissions 71,049 49,350 46,572
Others 222,736 157,185 149,316
Total S/ 3,126,857 S/ 2,911,408 S/ 2,771,561