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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Additional Information (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Provisions for future non-participating benefits S/ 9,950,233 S/ 8,452,671
Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Provisions for future non-participating benefits 8,457,046 7,062,380
Claims incurred but not reported 393,400 314,500
General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Provisions for future non-participating benefits 1,241,717 1,156,368
Claims incurred but not reported 24,300 16,700
Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Provisions for future non-participating benefits 251,470 233,923
Claims incurred but not reported 63,500 50,200
Mathematic reserve [Member] | Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Provisions for future non-participating benefits S/ 5,961,000 S/ 4,073,300