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FINANCIAL RISK MANAGEMENT (Details 13) - PEN (S/)
S/ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Equity securities at 10 percent change [Member] | Measured at fair value through other comprehensive Change in income    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 64,947  
Equity securities at 25 percent change [Member] | Measured at fair value through other comprehensive Change in income    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 162,368  
Equity securities at 30 percent change [Member] | Measured at fair value through other comprehensive Change in income    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 194,841  
Participation in Mutual Funds at 10 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 25,687  
Participation in Mutual Funds at 25 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 64,219  
Participation in Mutual Funds at 30 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 77,062  
Restricted mutual funds at 10 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 40,735  
Restricted mutual funds at 25 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 101,838  
Restricted mutual funds at 30 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 122,205  
Participation in RAL funds at 10 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 44,504  
Participation in RAL funds at 25 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 111,260  
Participation in RAL funds at 30 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 133,512  
Investment funds at 10 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 32,346  
Investment funds at 25 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 80,864  
Investment funds at 30 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 97,037  
Hedge Funds at 10 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 10.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 4,434  
Hedge Funds at 25 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 25.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 11,084  
Hedge Funds at 30 percent change [Member] | Measured at fair value through profit or loss    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price 30.00%  
Sensitivity Analysis,expected unrealized gain or loss due to change in market price S/ 13,301  
Market price change risk [Member] | Equity securities at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 76,559
Market price change risk [Member] | Equity securities at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 191,399
Market price change risk [Member] | Equity securities at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 229,678
Market price change risk [Member] | Participation in Mutual Funds at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 40,957
Market price change risk [Member] | Participation in Mutual Funds at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 102,392
Market price change risk [Member] | Participation in Mutual Funds at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 122,870
Market price change risk [Member] | Restricted mutual funds at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 41,670
Market price change risk [Member] | Restricted mutual funds at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 104,174
Market price change risk [Member] | Restricted mutual funds at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 125,009
Market price change risk [Member] | Participation in RAL funds at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 52,741
Market price change risk [Member] | Participation in RAL funds at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 131,851
Market price change risk [Member] | Participation in RAL funds at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 158,222
Market price change risk [Member] | Investment funds at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 5,962
Market price change risk [Member] | Investment funds at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 14,905
Market price change risk [Member] | Investment funds at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 17,886
Market price change risk [Member] | Hedge Funds at 10 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   10.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 106
Market price change risk [Member] | Hedge Funds at 25 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   25.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 266
Market price change risk [Member] | Hedge Funds at 30 percent change [Member]    
Disclosure of financial risks management [Line Items]    
Sensitivity Analysis, Percentage Changes In Market Price   30.00%
Sensitivity Analysis,expected unrealized gain or loss due to change in market price   S/ 319