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MERGER AND ACQUISITIONS - Acquisitions costs and pro forma details (Details)
S/ in Millions, $ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
CLP ($)
Dec. 31, 2019
COP ($)
Dec. 31, 2019
PEN (S/)
Bancompartir        
Disclosure of detailed information about business combination [line items]        
Acquisition costs     $ 2,040.2 S/ 2.0
Interest and similar income S/ 16.5      
Interest and similar income if the combination had taken place at the beginning of the year       198.7
Increase in interest and similar income if the combination had taken place at the beginning of the year       182.2
Ultraserfinco S.A.        
Disclosure of detailed information about business combination [line items]        
Acquisition costs     $ 2,040.2 2.0
Multicaja S.A        
Disclosure of detailed information about business combination [line items]        
Acquisition costs   $ 50.6   0.2
Tenpo SpA        
Disclosure of detailed information about business combination [line items]        
Acquisition costs   $ 50.6   0.2
Culqi        
Disclosure of detailed information about business combination [line items]        
Acquisition costs       S/ 0.1