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TECHNICAL RESERVES FOR INSURANCE CLAIMS AND PREMIUMS - Summary of of detailed information about movement in direct and assumed 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
Direct and assumed claim reserve [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 1,366,670 1,180,852
Gross claims 1,875,852 1,607,604
Payments (1,654,407) (1,445,671)
Exchange difference (11,887) 23,885
Ending balance 1,576,228 1,366,670
Direct and assumed claim reserve [Member] | Life insurance contracts [member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 732,868 626,871
Gross claims 1,001,671 737,982
Payments (822,644) (635,345)
Exchange difference (3,533) 3,360
Ending balance 908,362 732,868
Direct and assumed claim reserve [Member] | General insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 562,430 484,608
Gross claims 547,201 562,440
Payments (510,678) (505,069)
Exchange difference (8,365) 20,451
Ending balance 590,588 562,430
Direct and assumed claim reserve [Member] | Health insurance contracts [Member]    
Disclosure of insurance claim reserves and technical reserves [Line Items]    
Beginning balance 71,372 69,373
Gross claims 326,980 307,182
Payments (321,085) (305,257)
Exchange difference 11 74
Ending balance S/ 77,278 S/ 71,372