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Provisions - Maximum exposure to credit risk - Undrawn credit lines (Details) - Undrawn credit lines [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Normal $ 7,858,902 $ 7,756,251  
Substandard 1,468 1,502  
Non-complying 9,890 11,572  
Total 7,870,260 7,769,325 $ 7,240,406
Stage 1 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 1,135,118 1,279,611  
Substandard  
Non-complying  
Total 1,135,118 1,279,611 1,199,593
Stage 1 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 6,434,148 5,512,504  
Substandard  
Non-complying  
Total 6,434,148 5,512,504 5,086,210
Stage 2 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 81,990 177,084  
Substandard 1,468 1,502  
Non-complying  
Total 83,458 178,586 147,053
Stage 2 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 207,646 786,603  
Substandard  
Non-complying 60  
Total 207,646 786,663 794,449
Stage 3 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying 359 328  
Total 359 328 411
Stage 3 - Group [Member]      
Disclosure of other provisions [line items]      
Normal 449  
Substandard  
Non-complying 9,531 11,184  
Total $ 9,531 $ 11,633 $ 12,690