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Provisions - Maximum exposure to credit risk - Other commitments (Details) - Other commitments [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Normal $ 155,163 $ 46,561  
Substandard  
Non-complying  
Total 155,163 46,561 $ 60,609
Stage 1 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 155,163 46,561  
Substandard  
Non-complying  
Total 155,163 46,561 49,519
Stage 1 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 2 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total 11,090
Stage 2 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
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