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Significant Events (Details Textual) - CLP ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Aug. 12, 2019
Nov. 27, 2019
Sep. 26, 2019
Aug. 27, 2019
Jul. 30, 2019
Apr. 23, 2019
Mar. 26, 2019
Dec. 31, 2019
Dec. 31, 2018
Significant Events (Textual)                  
Net profit                 60.00%
Shareholders dividend per share           $ 1.88457837      
Profits used to increase the banks reserves           40.00%      
Percentage of capital stock             49.00%    
Capital stock             $ 59,063,470,000    
Consideration acquisition shares issued, percentage 51.00%     51.00% 51.00%        
Percentage of subscribed subsidiary     50.10%            
New subsidiaries, description   The Bank acquired 51% of Santander Consumer S.A., an automobile financing non-banking company, which became a subsidiary of the Bank and a supporting banking business company from SK Berge (49%) and Banco Santander S.A. (2%) for a total amount MCh$62,136. The purchase generated a negative equity effect of MCh$37,041, since it was considered a transaction between entities under common control, the Bank used “predecessor accounting method”.              
Investment percentage               12.90%  
Description of social unrest               As of December 31, 2019, the Bank recorded an impairment for an amount of MCh$2,726 (see Note 33), and expenses for MCh$1,823 as other operational expenses (see Note 34). Most of this damage was insured.  
AUD [Member]                  
Significant Events (Textual)                  
Bank has issued senior bonds               $ 185,000,000  
EUR [Member]                  
Significant Events (Textual)                  
Bank has issued senior bonds               65,000,000  
CHF [Member]                  
Significant Events (Textual)                  
Bank has issued senior bonds               $ 250,000,000