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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Summary of detailed information about variations in the claim reserves by changes in interest rates and mortality tables (Details) - PEN (S/) S/ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
PEN [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Claim reserve | S/ 3,896,211 | S/ 3,163,166
Amount of reserve after changes in interest rate by 100 positive base points | 3,575,717 | 2,869,164
Amount of reserve after changes in interest rate by 100 negative base points | 4,285,955 | 3,520,992
Amount of reserve after increase in mortality tables by 105 percent | 3,872,104 | 3,141,047
Amount of reserve after decrease in mortality tables by 95 percent | 3,922,178 | 3,186,369
Amount of variation of reserve on changes in interest rate by 100 positive base points | (320,494) | (294,001)
Amount of variation of reserve on changes in interest rate by 100 negative base points | 389,743 | 357,827
Amount of variation of reserve on increase in mortality tables by 105 percent | (24,107) | (22,118)
Amount of variation of reserve on decrease in mortality tables by 95 percent | S/ 25,967 | S/ 23,203
Percentage of variantion of reserve on changes in interest rate by 100 positive base points | (8.23%) | (9.29%)
Percentage of variantion of reserve on changes in interest rate by 100 negative base points | 10.00% | 11.31%
Percentage of variation of reserve on increase in mortality tables by 105 percent | (0.62%) | (0.70%)
Percentage of variation of reserve on decrease in mortality tables by 95 percent | 0.67% | 0.73%
US Dollars [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Claim reserve | S/ 614,766 | S/ 518,160
Amount of reserve after changes in interest rate by 100 positive base points | 568,767 | 473,054
Amount of reserve after changes in interest rate by 100 negative base points | 669,412 | 571,943
Amount of reserve after increase in mortality tables by 105 percent | 609,349 | 512,875
Amount of reserve after decrease in mortality tables by 95 percent | 620,430 | 523,707
Amount of variation of reserve on changes in interest rate by 100 positive base points | (45,999) | (45,106)
Amount of variation of reserve on changes in interest rate by 100 negative base points | 54,646 | 53,783
Amount of variation of reserve on increase in mortality tables by 105 percent | (5,417) | (5,285)
Amount of variation of reserve on decrease in mortality tables by 95 percent | S/ 5,664 | S/ 5,547
Percentage of variantion of reserve on changes in interest rate by 100 positive base points | (7.48%) | (8.70%)
Percentage of variantion of reserve on changes in interest rate by 100 negative base points | 8.89% | 10.38%
Percentage of variation of reserve on increase in mortality tables by 105 percent | (0.88%) | (1.02%)
Percentage of variation of reserve on decrease in mortality tables by 95 percent | 0.92% | 1.07%

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- Definition The amount of reserve after changes in interest rate by 100 negative base points. + References No definition available. + Details
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