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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% |  |  |  |

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