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MERGER AND ACQUISITIONS - Acquisition of non-controlling interest of Mibanco, Banco de la Microempresa S.A. (Mibanco) (Details) - PEN (S/)
S/ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 01, 2019
May 23, 2018
May 22, 2018
Apr. 18, 2018
Disclosure of detailed information about business combination [line items]          
Consideration paid   S/ 255.7      
Mibanco [Member] | Grupo Crdito S.A          
Disclosure of detailed information about business combination [line items]          
Percentage of share capital acquired         3.23%
Consideration paid         S/ 129.0
Mibanco [Member] | Banco de Crdito del Per S.A.          
Disclosure of detailed information about business combination [line items]          
Percentage of share capital acquired     0.05% 1.22% 0.06%
Consideration paid     S/ 1.9 S/ 47.3 S/ 2.4
Bottom of range [member] | Mibanco [Member]          
Disclosure of detailed information about business combination [line items]          
Ownership interest held 93.18%        
Top of range [member] | Mibanco [Member]          
Disclosure of detailed information about business combination [line items]          
Ownership interest held 97.74%