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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Santander Corredora de Seguros Limitada [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of the Subsidiary |  | Santander Corredora de Seguros Limitada |  |
Main Activity |  | Insurance brokerage |  |
Country |  | Santiago, Chile |  |
Direct interest Owned |  | 99.75% | 99.75% | 99.75%
indirect interest Owned |  | 0.01% | 0.01% | 0.01%
Total interest Owned |  | 99.76% | 99.76% | 99.76%
Santander Corredores de Bolsa Limitada [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of the Subsidiary |  | Santander Corredores de Bolsa Limitada |  |
Main Activity |  | Financial instruments brokerage |  |
Country |  | Santiago, Chile |  |
Direct interest Owned |  | 50.59% | 50.59% | 50.59%
indirect interest Owned |  | 0.41% | 0.41% | 0.41%
Total interest Owned |  | 51.00% | 51.00% | 51.00%
Santander Agente de Valores Limitada [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of the Subsidiary | [1] | Santander Agente de Valores Limitada |  |
Main Activity | [1] | Securities brokerage |  |
Country | [1] | Santiago, Chile |  |
Direct interest Owned | [1] | 99.03% | 99.03% | 99.03%
indirect interest Owned | [1] |  |  |
Total interest Owned | [1] | 99.03% | 99.03% | 99.03%
Santander S.A. Sociedad Securitizadora [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Name of the Subsidiary |  | Santander S.A. Sociedad Securitizadora |  |
Main Activity |  | Purchase of credits and issuance of debt instruments |  |
Country |  | Santiago, Chile |  |
Direct interest Owned |  | 99.64% | 99.64% | 99.64%
indirect interest Owned |  |  |  |
Total interest Owned |  | 99.64% | 99.64% | 99.64%
[1] | On July 25, 2018, the company has ceased conducting foreign currency purcharse and sale operations, hence forth this operation will be carried out directly by the Bank.

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