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FINANCIAL RISK MANAGEMENT (Details 13) - PEN (S/) S/ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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