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Provisions - Maximum exposure to credit risk - Issued foreign letters of credit (Details) - Issued foreign letters of credit [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Normal $ 316,916 $ 388,396  
Substandard  
Non-complying  
Total 316,916 388,396 $ 94,313
Stage 1 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 149,753 344,874  
Substandard  
Non-complying  
Total 149,753 344,874 80,106
Stage 1 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 1,308 1,585  
Substandard  
Non-complying  
Total 1,308 1,585 1,737
Stage 2 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 165,538 41,823  
Substandard  
Non-complying  
Total 165,538 41,823 11,984
Stage 2 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 317 114  
Substandard  
Non-complying  
Total 317 114 486
Stage 3 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 3 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total