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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 1) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Redbanc S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Redbanc S.A. |  |
Main activity |  | ATM services |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share |  | 33.43% | 33.43% | 33.43%
Transbank S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates | [1] | Transbank S.A. |  |
Main activity | [1] | Debit and credit card services |  |
Place of incorporation and operation | [1] | Santiago, Chile |  |
Percentage of ownership share | [1] | 25.00% | 25.00% | 25.00%
Centro de Compensacion Automatizado S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Centro de Compensación Automatizado |  |
Main activity |  | Electronic fund transfer and compensation services |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share |  | 33.33% | 33.33% | 33.33%
Sociedad Interbancaria de Deposito de Valores S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Sociedad Interbancaria de Depósito de Valores S.A. |  |
Main activity |  | Delivery of securities on public offer |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share |  | 29.29% | 29.29% | 29.29%
Camara de Compensacion de Alto Valor S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Cámara Compensación de Alto Valor S.A. |  |
Main activity |  | Payments clearing |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share | [2],[3],[4] | 15.00% | 15.00% | 14.93%
Administrador Financiero del Transantiago S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Administrador Financiero del Transantiago S.A. |  |
Main activity |  | Administration of boarding passes to public transportation |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share |  | 20.00% | 20.00% | 20.00%
Sociedad Nexus S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Sociedad Nexus S.A. |  |
Main activity |  | Credit card processor |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share |  | 12.90% | 12.90% | 12.90%
Servicios de Infraestructura de Mercado OTC S.A. [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Associates |  | Servicios de Infraestructura de Mercado OTC S.A. |  |
Main activity |  | Administration of the infrastructure for the financial market of derivative instruments |  |
Place of incorporation and operation |  | Santiago, Chile |  |
Percentage of ownership share | [2],[3] | 12.48% | 12.48% | 12.07%
[1] | The Bank has given a mandate to third party to exercise its rights as shareholder in Transbank.
[2] | During 2016, Banco Penta ceded to Banco Santander a portion of its interest in the companies "Sociedad Operadora de la Camara de Compensacion de pagos de Alto Valor SA" and "Market infrastructure services OTC S,A". the Bank's share in those companies increased to 14.93% and 12.07% respectively.
[3] | During 2016, Banco Penta ceded to Banco Santander a portion of its interest in the companies "Sociedad Operadora de la Camara de Compensacion de pagos de Alto Valor SA'' and "Servicios de Infraestructura de Mercado OTC S,A", the Banks share in those companies increased to 14.84% and 11.93% respectively.
[4] | In February 2017, Banco Paris sold to Banco Santander a portion of its interest in the companies "Sociedad Operadora de la Camara de Compensacion de pagos de Alto Valor SA", the Banks share increased to 15.00%.

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