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Provisions - Maximum exposure to credit risk - Performance guarantees (Details) - Performance guarantees - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Contingencies and Commitments    
Maximum exposure to credit risk $ 2,232,682 $ 2,220,828
Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 2,221,484 2,209,665
Substandard    
Contingencies and Commitments    
Maximum exposure to credit risk 7,586 9,157
Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 3,612 $ 2,006
12-month expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 1,685,980  
12-month expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 1,685,980  
12-month expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 54,523  
12-month expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 54,523  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 485,075  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 477,489  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual | Substandard    
Contingencies and Commitments    
Maximum exposure to credit risk 7,586  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 3,544  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 3,470  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 74  
Lifetime expected credit losses | Financial instruments credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 2,310  
Lifetime expected credit losses | Financial instruments credit-impaired | Individual | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk 2,310  
Lifetime expected credit losses | Financial instruments credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 1,250  
Lifetime expected credit losses | Financial instruments credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 22  
Lifetime expected credit losses | Financial instruments credit-impaired | Group | Non-complying    
Contingencies and Commitments    
Maximum exposure to credit risk $ 1,228