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INVESTMENTS - Additional Information (Details)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
PEN (S/)
item
Dec. 31, 2018
PEN (S/)
item
Dec. 31, 2017
PEN (S/)
Jul. 30, 2019
USD ($)
Jan. 01, 2018
PEN (S/)
Disclosure of Investments [Line Items]          
Losses on disposals of investments S/ 1,500 S/ 8,200      
Credit derivative, nominal amount 69,720,506 56,935,229      
Financial assets available-for-sale 25,370,413 24,331,543      
Dividends received 3,610,700 3,689,400      
Gains on disposals of investments 546,814 242,829 S/ 760,772    
Financial assets at amortised cost 1,907,738 1,292,203      
Investments in equity instruments designated at fair value through other comprehensive income 48,800       S/ 653,539
Unrealized Gain Loss on Listed Securities 700 S/ 1,900      
Increase (decrease) through transfers, exposure to credit risk on loan commitments and financial guarantee contracts S/ 13,000        
Financial Assets Maturity Date Description January 2020 and April 2026 January 2019 and April 2026      
Repurchase Agreement [Member]          
Disclosure of Investments [Line Items]          
Investments in equity instruments designated at fair value through other comprehensive income S/ 1,588,700 S/ 2,138,900      
Cash flow hedges          
Disclosure of Investments [Line Items]          
Financial assets available-for-sale 43,800        
Cross currency swap contract four [Member] | Cash flow hedges          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount S/ 107,400 S/ 136,100      
Certificates of payment on work progress [Member] | Bottom of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 3.74% 4.72%      
Certificates of payment on work progress [Member] | Top of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 4.67% 6.02%      
Financial assets at amortised cost, class [member]          
Disclosure of Investments [Line Items]          
Notional amount | $       $ 2,117,500.000  
Financial assets at amortised cost | $       73,030,400  
Financial assets, at fair value S/ 1,569,300 S/ 2,953,300   75,147,900  
Credit exposure | $       $ 82,400.000  
The Soles [Member] | Bottom of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 2.14% 3.15%      
The Soles [Member] | Top of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 5.28% 6.24%      
US Dollars [Member] | Bottom of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 0.45% 1.22%      
US Dollars [Member] | Top of range [member]          
Disclosure of Investments [Line Items]          
Annual effective interest rate of held to maturity investments 2.53% 5.56%      
US Dollars [Member] | Participation in RAL Fund [Member]          
Disclosure of Investments [Line Items]          
Financial assets available-for-sale S/ 133,500 S/ 270,700      
Bolivianos [Member] | Participation in RAL Fund [Member]          
Disclosure of Investments [Line Items]          
Financial assets available-for-sale S/ 166,900 S/ 174,300      
Certificates of deposit BCRP [Member]          
Disclosure of Investments [Line Items]          
Number of instruments or interests issued or issuable | item 87,530 99,587      
Financial assets available-for-sale S/ 8,665,272 S/ 9,829,584      
Government Treasury Bonds [Member]          
Disclosure of Investments [Line Items]          
Financial assets available-for-sale 6,698,076 5,190,748      
Government Treasury Bonds [Member] | Interest rate swap contract six [Member] | Cash flow hedges          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount   77,800      
Derivatives held as hedges [Member]          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount 6,270,638 6,939,413      
Derivatives held as hedges [Member] | Cross currency swap contract four [Member] | Cash flow hedges          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount 0 77,822      
Derivatives held as hedges [Member] | Cross currency swap contract five [Member] | Cash flow hedges          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount 331,400 337,300      
Derivatives held as hedges [Member] | Cross currency swap contract five [Member] | Fair value hedges [member]          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount 618,800 923,900      
Derivatives held as hedges [Member] | Interest rate swap contract six [Member] | Cash flow hedges          
Disclosure of Investments [Line Items]          
Credit derivative, nominal amount S/ 331,400 S/ 0