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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Summary of detailed information about movement in technical insurance claim reserves (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance S/ 8,452,671  
Ending balance 9,950,233 S/ 8,452,671
Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 7,062,380  
Ending balance 8,457,046 7,062,380
General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 1,156,368  
Ending balance 1,241,717 1,156,368
Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 233,923  
Ending balance 251,470 233,923
Technical claim reserve [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 7,086,001 6,262,908
Time course expenses and others 64,098 (117,965)
Unearned premium and other technical reserves variation, net 12,713 79,349
Insurance subscriptions 612,954 724,458
Adjustment by application of market rates 666,556  
Exchange difference and others (68,317) 137,251
Ending balance 8,374,005 7,086,001
Technical claim reserve [Member] | Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 6,329,512 5,599,777
Time course expenses and others 67,989 (117,965)
Unearned premium and other technical reserves variation, net (61,834) 1,901
Insurance subscriptions 604,262 724,458
Adjustment by application of market rates 666,556  
Exchange difference and others (57,801) 121,341
Ending balance 7,548,684 6,329,512
Technical claim reserve [Member] | General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 593,938 513,826
Time course expenses and others (3,891) 0
Unearned premium and other technical reserves variation, net 62,862 64,302
Insurance subscriptions 8,692 0
Adjustment by application of market rates 0  
Exchange difference and others (10,472) 15,810
Ending balance 651,129 593,938
Technical claim reserve [Member] | Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 162,551 149,305
Time course expenses and others 0 0
Unearned premium and other technical reserves variation, net 11,685 13,146
Insurance subscriptions 0 0
Adjustment by application of market rates 0  
Exchange difference and others (44) 100
Ending balance S/ 174,192 S/ 162,551