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NET PREMIUMS EARNED - Additional Information (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from insurance contracts issued, without reduction for reinsurance held [1] S/ 2,884,845 S/ 2,642,947 S/ 2,308,143
Medical Assistance Services [Member] | Health insurance contract [Member]      
Revenue from insurance contracts issued, without reduction for reinsurance held S/ 464,700 S/ 420,500 S/ 386,300
Percentage of entity's revenue 84.78% 78.44% 77.73%
[1] This item includes earned premiums, reinsurance premiums accepted and coinsurance premiums accepted and received.