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ADMINISTRATIVE EXPENSES (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Administrative Expenses [Abstract]      
Repair and maintenance S/ 442,802 S/ 414,784 S/ 423,219
Publicity 336,203 304,119 300,401
Taxes and contributions 285,551 259,523 270,932
Rental 226,388 230,257 226,301
Consulting and professional fees 223,239 206,224 183,751
Transport and communications 176,623 176,273 188,444
Sundry supplies 54,742 49,935 45,878
Services by third-party and others [1] 584,496 517,708 455,752
Total S/ 2,330,044 S/ 2,158,823 S/ 2,094,678
[1] The balance consists mainly of security and protection services, cleaning service, representation expenses, electricity and water utilities, insurance expenses, subscription expenses, BCP agent commission expenses.