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INVESTMENTS (Details 2)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2019 / Feb-2065 Jan-2018 / 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-2019 / Jun-2020 Jan-2018 / Apr-2019
Government Treasury Bonds [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jan-2019 / Feb-2055 Feb-2018 / Feb-2055
Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets   Jan-2018 / Sep-2018
Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets   Mar-2018 / Feb-2044
Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets   Aug-2020 / Dec-2036
U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets   Aug-2035
Securitization instruments [Member]    
Disclosure of Investments [Line Items]    
Description Of Maturity Of Financial Assets Classified Out Of Availableforsale Financial Assets Jun-2019 / Sep-2045 Jan-2018 / 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-2019 / Dec-2026 Jan-2018 / Mar-2033
The Soles [Member] | Bottom of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.49% 1.37%
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 2.59% 3.08%
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 2.37% 1.32%
The Soles [Member] | Bottom of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
The Soles [Member] | Bottom of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   2.13%
The Soles [Member] | Bottom of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
The Soles [Member] | Bottom of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
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 3.40% 4.09%
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 4.54% 0.49%
The Soles [Member] | Top of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 11.90% 9.20%
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 3.04% 3.17%
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 6.50% 6.25%
The Soles [Member] | Top of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
The Soles [Member] | Top of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   7.04%
The Soles [Member] | Top of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
The Soles [Member] | Top of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
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 14.81% 11.75%
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 4.54% 4.33%
US Dollars [Member] | Bottom of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 1.16% 0.24%
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 8211.00% 8211.00%
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 1.22% 1.27%
US Dollars [Member] | Bottom of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
US Dollars [Member] | Bottom of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   1.83%
US Dollars [Member] | Bottom of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   2.23%
US Dollars [Member] | Bottom of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   1.66%
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 4.56% 3.06%
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 8211.00% 8211.00%
US Dollars [Member] | Top of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 11.39% 7.55%
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 8211.00% 8211.00%
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 7.07% 6.25%
US Dollars [Member] | Top of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
US Dollars [Member] | Top of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   2.44%
US Dollars [Member] | Top of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   9.40%
US Dollars [Member] | Top of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   1.66%
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 6.85% 6.16%
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 8211.00% 8211.00%
Other [Member] | Bottom of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 0.94% 0.17%
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 8211.00% 8211.00%
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 0.60% 8211.00%
Other [Member] | Bottom of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   0.50%
Other [Member] | Bottom of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
Other [Member] | Bottom of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
Other [Member] | Bottom of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
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 1.40% 1.18%
Other [Member] | Top of range [member] | Corporate, leasing and subordinated bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets 8.39% 7.83%
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 8211.00% 8211.00%
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 0.60% 8211.00%
Other [Member] | Top of range [member] | Certificates of Banco Central de Bolivia [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   1.15%
Other [Member] | Top of range [member] | Multilateral organization bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
Other [Member] | Top of range [member] | Collateralized mortgage obligations (CMO) [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
Other [Member] | Top of range [member] | U.S. Federal agency bonds [Member]    
Disclosure of Investments [Line Items]    
Effective Interest Rate Of Financial Assets Classified Out Of Availableforsale Financial Assets   8211.00%
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% 4.90%