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FINANCIAL RISK MANAGEMENT (Details Textual)
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
PEN (S/)
Dec. 31, 2017
PEN (S/)
Jan. 01, 2018
PEN (S/)
Disclosure of financial risks management [Line Items]      
Regulatory capital requirement S/ 25,063,900 S/ 21,723,000  
Regulatory Capital Exceeds Minimum Regulatory Capital Required 4,658,100 3,710,300  
Derivative financial assets 766,317 701,826 S/ 701,826
Derivative financial liabilities 715,804 636,762  
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 15,400 12,600  
Increase (decrease) in fair value of financial liability, attributable to changes in credit risk of liability 17,100 16,300  
Net impact of debit valuation and credit valuation adjustments 200 1,400  
Net unrealized gain of Level 3 financial instruments S/ 2,300 S/ 39,100  
Closing foreign exchange rate 3.373 3.241  
Financial assets S/ 32,863,118 [1] S/ 32,862,001 [1] 164,228,539
Renegotiated Credits [Member]      
Disclosure of financial risks management [Line Items]      
Financial assets 1,281,500 915,600  
Loans to commercial [Member]      
Disclosure of financial risks management [Line Items]      
Increase (decrease) in allowance account for credit losses of financial assets 136,000    
Financial assets impaired [member]      
Disclosure of financial risks management [Line Items]      
Derivative financial assets     0
Financial assets     S/ 216,340
Financial assets impaired [member] | Renegotiated Credits [Member]      
Disclosure of financial risks management [Line Items]      
Financial assets 671,600 410,700  
Financial assets past due but not impaired [member] | Renegotiated Credits [Member]      
Disclosure of financial risks management [Line Items]      
Financial assets 270,300 165,300  
Financial assets neither past due nor impaired [member] | Renegotiated Credits [Member]      
Disclosure of financial risks management [Line Items]      
Financial assets S/ 339,600 S/ 339,600  
[1] The balances of financial instruments at December 31, 2018 have been prepared in accordance with IFRS 9; the balances of the previous period have not been restated, see Note 3(a)(i).