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NET GAIN ON SECURITIES (Parenthetical) (Details) - Associates [member] - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gains (losses) on disposals of investments [1] S/ 72,254 S/ 49,268 S/ 41,444
Entidad Prestadora de Salud [Member]      
Gains (losses) on disposals of investments S/ 50,400 S/ 37,200  
[1] It mainly includes the profit of its associated Entidad Prestadora de Salud for approximately S/50.4 million during the year 2018 (S/37.2 million in 2017).