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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS (Details 4) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Percentage of variantion of reserve on changes in interest rate by 100 positive base points (9.29%) (9.48%)
PEN [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Claim reserve S/ 3,163,166 S/ 2,682,536
Amount of reserve after changes in interest rate by 100 positive base points 2,869,164 2,428,338
Amount of reserve after changes in interest rate by 100 negative base points 3,520,992 2,993,483
Amount of reserve after increase in mortality tables by 105 percent 3,141,047 2,660,474
Amount of reserve after decrease in mortality tables by 95 percent 3,186,369 2,705,711
Amount of variation of reserve on changes in interest rate by 100 positive base points (294,001) (254,198)
Amount of variation of reserve on changes in interest rate by 100 negative base points 357,827 310,948
Amount of variation of reserve on increase in mortality tables by 105 percent (22,118) (22,062)
Amount of variation of reserve on decrease in mortality tables by 95 percent S/ 23,203 S/ 23,176
Percentage of variantion of reserve on changes in interest rate by 100 negative base points 11.31% 11.59%
Percentage of variation of reserve on increase in mortality tables by 105 percent (0.70%) (0.82%)
Percentage of variation of reserve on decrease in mortality tables by 95 percent 0.73% 0.86%
US Dollars [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Claim reserve S/ 518,160 S/ 519,317
Amount of reserve after changes in interest rate by 100 positive base points 473,054 473,067
Amount of reserve after changes in interest rate by 100 negative base points 571,943 574,664
Amount of reserve after increase in mortality tables by 105 percent 512,875 514,091
Amount of reserve after decrease in mortality tables by 95 percent 523,707 524,801
Amount of variation of reserve on changes in interest rate by 100 positive base points (45,106) (46,250)
Amount of variation of reserve on changes in interest rate by 100 negative base points 53,783 55,347
Amount of variation of reserve on increase in mortality tables by 105 percent (5,285) (5,226)
Amount of variation of reserve on decrease in mortality tables by 95 percent S/ 5,547 S/ 5,484
Percentage of variantion of reserve on changes in interest rate by 100 positive base points (8.70%) (8.91%)
Percentage of variantion of reserve on changes in interest rate by 100 negative base points 10.38% 10.66%
Percentage of variation of reserve on increase in mortality tables by 105 percent (1.02%) (1.01%)
Percentage of variation of reserve on decrease in mortality tables by 95 percent 1.07% 1.06%