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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Additional Information (Details) - PEN (S/) S/ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Provisions for future non-participating benefits | S/ 11,675,076 | S/ 9,950,233
Life insurance contracts [member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Provisions for future non-participating benefits | 10,072,788 | 8,457,046
Claims incurred but not reported | 602,700 | 393,400
General insurance contracts [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Provisions for future non-participating benefits | 1,286,293 | 1,241,717
Claims incurred but not reported | 42,500 | 24,300
Health insurance contracts [Member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Provisions for future non-participating benefits | 315,995 | 251,470
Claims incurred but not reported | 125,300 | 63,500
Mathematic reserve [Member] | Life insurance contracts [member] |  |
Disclosure of insurance claim reserves and technical reserves [Line Items] |  |
Provisions for future non-participating benefits | S/ 6,806,100 | S/ 5,961,000

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