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Provisions - Maximum exposure to credit risk - Undrawn credit lines (Details) - Undrawn credit lines - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Contingencies and Commitments    
Maximum exposure to credit risk $ 7,769,325 $ 7,240,406
Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 7,756,251 7,227,822
Substandard    
Contingencies and Commitments    
Maximum exposure to credit risk 1,502 1,791
Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 11,572 $ 10,793
12-month expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 1,279,611  
12-month expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 1,279,611  
12-month expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 5,512,504  
12-month expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 5,512,504  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 178,586  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 177,084  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual | Substandard    
Contingencies and Commitments    
Maximum exposure to credit risk 1,502  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 786,663  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 786,603  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 60  
Lifetime expected credit losses | Financial instruments credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 328  
Lifetime expected credit losses | Financial instruments credit-impaired | Individual | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 328  
Lifetime expected credit losses | Financial instruments credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 11,633  
Lifetime expected credit losses | Financial instruments credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 449  
Lifetime expected credit losses | Financial instruments credit-impaired | Group | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk $ 11,184