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FINANCIAL RISK MANAGEMENT (Details Textual)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
PEN (S/)
Disclosure of financial risks management [Line Items]    
Regulatory capital requirement S/ 21,723,000 S/ 21,174,700
Regulatory Capital Exceeds Minimum Regulatory Capital Required 3,710,300 3,915,700
Derivative financial assets 701,826 942,602
Derivative financial liabilities 636,762 673,015
Increase (decrease) in fair value of financial assets designated as measured at fair value through profit or loss, attributable to changes in credit risk of financial assets 12,600 8,000
Increase (decrease) in fair value of financial liability, attributable to changes in credit risk of liability 16,300 15,000
Net impact of debit valuation and credit valuation adjustments 1,400 9,300
Net unrealized gain of Level 3 financial instruments S/ 39,100 S/ 40,600
Closing foreign exchange rate 3.241 3.356
Financial assets S/ 32,862,001 S/ 27,819,106
Renegotiated Credits [Member]    
Disclosure of financial risks management [Line Items]    
Borrowings, maturity between 1 and 18 months  
Financial assets S/ 915,600 845,000
Financial assets impaired [member] | Renegotiated Credits [Member]    
Disclosure of financial risks management [Line Items]    
Financial assets 410,700 339,300
Financial assets past due but not impaired [member] | Renegotiated Credits [Member]    
Disclosure of financial risks management [Line Items]    
Financial assets 165,300 201,200
Financial assets neither past due nor impaired [member] | Renegotiated Credits [Member]    
Disclosure of financial risks management [Line Items]    
Financial assets S/ 339,600 S/ 304,500