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Loans to Customers, net - Allowance for loan losses associated with impaired loans and with non-impaired loans (Details)
$ in Thousands, $ in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Dec. 31, 2014
CLP ($)
Allowances for impaired loans associated with impaired loans and with non-impaired loans          
Total allowances for loan losses $ (40,550,009) $ (24,955,692) $ (24,843,655) $ (24,022,983)  
Accumulated Amortization and Impairment          
Allowances for impaired loans associated with impaired loans and with non-impaired loans          
Provision for not yet identified but incurred impairment   (247,119) (255,353)    
Total allowances for loan losses   495,821 554,769 550,443  
Accumulated Amortization and Impairment | Total provision          
Allowances for impaired loans associated with impaired loans and with non-impaired loans          
Allowances for impaired loans   (248,702) (299,416)    
Total allowances for loan losses   495,821 554,769 550,443 $ 490,558
Accumulated Amortization and Impairment | Individual Provision          
Allowances for impaired loans associated with impaired loans and with non-impaired loans          
Allowances for impaired loans   (57,486) (106,456)    
Total allowances for loan losses   110,722 164,662 212,424  
Accumulated Amortization and Impairment | Group Provision          
Allowances for impaired loans associated with impaired loans and with non-impaired loans          
Allowances for impaired loans   (191,216) (192,960)    
Total allowances for loan losses   $ 385,099 $ 390,107 $ 338,019