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Provisions - Maximum exposure to credit risk - Foreign office guarantees and standby letters of credit (Details) - Foreign office guarantees and standby letters of credit [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Normal $ 280,462 $ 341,329  
Substandard 376 347  
Non-complying  
Total 280,838 341,676 $ 285,035
Stage 1 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 249,306 332,965  
Substandard  
Non-complying  
Total 249,306 332,965 274,563
Stage 1 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 395 138  
Substandard  
Non-complying  
Total 395 138 84
Stage 2 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 30,761 8,226  
Substandard 376 347  
Non-complying  
Total 31,137 8,573 10,388
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