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INVESTMENTS - The maturities and annual market rates of investments at fair value (Details )
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Corporate bonds    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2020 / Feb-2065 Jan-2019 / Feb-2065
Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2020 / Jul-2021 Jan-2019 / Jun-2020
Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2020 / Feb-2055 Jan-2019 / Feb-2055
Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets May-2020 / Sep-2045 Jun-2019 / Sep-2045
Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2020 / Dec 2026 Jan-2019 / Dec-2026
Subordinated bonds    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Apr-2022 / Aug-2045 Jan-2021 / Feb-2057
Others    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2020 / Jan-2028 Oct-2019 / Jun-2021
The Soles [Member] | Bottom of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.09% 1.49%
The Soles [Member] | Bottom of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 2.02% 2.59%
The Soles [Member] | Bottom of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.55% 2.37%
The Soles [Member] | Bottom of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 2.46% 3.40%
The Soles [Member] | Bottom of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 3.27% 4.54%
The Soles [Member] | Bottom of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.21% 3.21%
The Soles [Member] | Bottom of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.95% 4.24%
The Soles [Member] | Top of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 8.16% 11.90%
The Soles [Member] | Top of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 2.35% 3.04%
The Soles [Member] | Top of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 5.31% 6.50%
The Soles [Member] | Top of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 13.26% 14.81%
The Soles [Member] | Top of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 4.01% 4.54%
The Soles [Member] | Top of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 5.52% 7.41%
The Soles [Member] | Top of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 3.73% 6.14%
US Dollars [Member] | Bottom of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.47% 1.16%
US Dollars [Member] | Bottom of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%
US Dollars [Member] | Bottom of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.11% 1.22%
US Dollars [Member] | Bottom of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 3.08% 4.56%
US Dollars [Member] | Bottom of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 2.48% 0.00%
US Dollars [Member] | Bottom of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 3.27% 3.60%
US Dollars [Member] | Bottom of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 4.73% 0.00%
US Dollars [Member] | Top of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 8.25% 11.39%
US Dollars [Member] | Top of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%
US Dollars [Member] | Top of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 4.61% 7.07%
US Dollars [Member] | Top of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 9.14% 6.85%
US Dollars [Member] | Top of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 2.68% 0.00%
US Dollars [Member] | Top of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 5.23% 7.26%
US Dollars [Member] | Top of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 6.92% 0.00%
Other [Member] | Bottom of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.62% 0.94%
Other [Member] | Bottom of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%
Other [Member] | Bottom of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.43% 0.60%
Other [Member] | Bottom of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.68% 1.68%
Other [Member] | Bottom of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.00% 1.40%
Other [Member] | Bottom of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.53% 2.52%
Other [Member] | Bottom of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%
Other [Member] | Top of range [member] | Corporate bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 6.55% 8.39%
Other [Member] | Top of range [member] | Certificates of deposit BCRP [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%
Other [Member] | Top of range [member] | Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.82% 0.60%
Other [Member] | Top of range [member] | Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 6.00% 6.00%
Other [Member] | Top of range [member] | Negotiable certificates of deposits [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 4.98% 4.98%
Other [Member] | Top of range [member] | Subordinated bonds    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.53% 2.52%
Other [Member] | Top of range [member] | Others    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.00% 0.00%