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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS (Details 1) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Ending balance S/ 8,452,671 S/ 7,443,760
Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Ending balance 7,062,380 6,226,648
General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Ending balance 1,156,368 998,434
Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Ending balance 233,923 218,678
Direct and assumed claim reserve [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 1,180,852 937,997
Claims, Note 25 1,607,604 1,601,691
Payments (1,445,671) (1,346,115)
Exchange difference 23,885 (12,721)
Ending balance 1,366,670 1,180,852
Direct and assumed claim reserve [Member] | Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 626,871 551,516
Claims, Note 25 737,982 646,026
Payments (635,345) (569,108)
Exchange difference 3,360 (1,563)
Ending balance 732,868 626,871
Direct and assumed claim reserve [Member] | General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 484,608 325,748
Claims, Note 25 562,440 661,108
Payments (505,069) (491,108)
Exchange difference 20,451 (11,140)
Ending balance 562,430 484,608
Direct and assumed claim reserve [Member] | Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 69,373 60,733
Claims, Note 25 307,182 294,557
Payments (305,257) (285,899)
Exchange difference 74 (18)
Ending balance S/ 71,372 S/ 69,373