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Loans to Customers, net - Sale or transfer of credits from the loans to customers (Details)
$ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Jan. 01, 2018
CLP ($)
Financial Assets Held-for-Trading            
Loans to customers   $ 24,955,692   $ 39,419,340 $ 27,341,254  
Effect on income (loss) gain $ 267 2,063 $ 4,930      
Sale of loans            
Financial Assets Held-for-Trading            
Sale price 21,876 24,149        
Effect on income (loss) gain 267 2,063        
Sale of outstanding loans            
Financial Assets Held-for-Trading            
Sale price 21,876 24,126        
Effect on income (loss) gain $ 267 2,040        
Sale of write-off loans            
Financial Assets Held-for-Trading            
Sale price   23        
Effect on income (loss) gain   23        
Gross Balance            
Financial Assets Held-for-Trading            
Loans to customers   25,451,513     27,926,632  
Gross Balance | Sale of loans            
Financial Assets Held-for-Trading            
Loans to customers   33,681     22,567  
Gross Balance | Sale of outstanding loans            
Financial Assets Held-for-Trading            
Loans to customers   33,681     22,567  
Accumulated Amortization            
Financial Assets Held-for-Trading            
Loans to customers   (495,821) $ (554,769)   (585,378) $ (569,638)
Accumulated Amortization | Sale of loans            
Financial Assets Held-for-Trading            
Loans to customers   (11,595)     (958)  
Accumulated Amortization | Sale of outstanding loans            
Financial Assets Held-for-Trading            
Loans to customers   $ (11,595)     $ (958)