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Provisions - Maximum exposure to credit risk - Performance guarantees (Details) - Performance guarantees [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Normal $ 2,274,290 $ 2,221,484
Substandard 5,806 7,586
Non-complying 3,294 3,612
Total 2,283,390 2,232,682
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Normal 1,804,374 1,685,980
Substandard
Non-complying
Total 1,804,374 1,685,980
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Normal 44,325 54,523
Substandard
Non-complying
Total 44,325 54,523
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Normal 414,621 477,489
Substandard 5,806 7,586
Non-complying
Total 420,427 485,075
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Normal 10,970 3,470
Substandard
Non-complying 74
Total 10,970 3,544
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Normal
Substandard
Non-complying 2,194 2,310
Total 2,194 2,310
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Normal 22
Substandard
Non-complying 1,100 1,228
Total $ 1,100 $ 1,250