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DUE TO BANKS AND CORRESPONDENTS - Summary of detailed information of balances of due to banks and correspondents by maturity (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents S/ 8,797,995 S/ 8,397,111
Over 90 days [Member]    
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents 2,062,121 1,917,829
From 3 months to 1 year [Member]    
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents 3,693,328 3,347,134
From 1 to 3 years [Member]    
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents 559,511 1,030,310
From 3 to 5 years [Member]    
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents 614,265 406,895
More than 5 years [Member]    
Disclosure Of Deposits From Banks Explanatory [Line Items]    
Due to banks and correspondents S/ 1,868,770 S/ 1,694,943