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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
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.