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Provisions - Maximum exposure to credit risk - Issued foreign letters of credit (Details) - Issued foreign letters of credit - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Contingencies and Commitments    
Maximum exposure to credit risk $ 388,396 $ 94,313
Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 388,396 $ 94,313
12-month expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 344,874  
12-month expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 344,874  
12-month expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 1,585  
12-month expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 1,585  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual    
Contingencies and Commitments    
Maximum exposure to credit risk 41,823  
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk 41,823  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group    
Contingencies and Commitments    
Maximum exposure to credit risk 114  
Lifetime expected credit losses | Financial instruments not credit-impaired | Group | Normal    
Contingencies and Commitments    
Maximum exposure to credit risk $ 114