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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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  
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  
Health insurance contracts [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 251,470 233,923  
Direct claim reserve [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 1,576,228 1,366,670  
Direct claim reserve [Member] | Life insurance contracts [member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 908,362 732,868  
Direct claim reserve [Member] | General insurance contracts [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 590,588 562,430  
Direct claim reserve [Member] | Health insurance contracts [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 77,278 71,372  
Technical claim reserve [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 8,374,005 7,086,001 S/ 6,262,908
Technical claim reserve [Member] | Life insurance contracts [member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 7,548,684 6,329,512 5,599,777
Technical claim reserve [Member] | General insurance contracts [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits 651,129 593,938 513,826
Technical claim reserve [Member] | Health insurance contracts [Member]      
Disclosure of insurance claim reserves and technical reserves [Line Items]      
Provisions for future non-participating benefits S/ 174,192 S/ 162,551 S/ 149,305