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RISK MANAGEMENT (Details 7) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]    
Expected credit loss allowance $ 723 $ 1,440
Mortgages [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Expected credit loss allowance   69,066
Consumer Loans [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Expected credit loss allowance   283,756
Credit Risk [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Gross carrying amount 30,282,022  
Collateral [1] 17,823,535  
Net exposure 12,458,487  
Expected credit loss allowance 882,414 $ 791,157
Credit Risk [Member] | Commercial Loans [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Gross carrying amount 15,254,752  
Collateral [1] 7,369,291  
Net exposure 7,885,461  
Expected credit loss allowance 506,802  
Credit Risk [Member] | Mortgages [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Gross carrying amount 10,150,981  
Collateral [1] 9,699,324  
Net exposure 451,657  
Expected credit loss allowance 91,270  
Credit Risk [Member] | Consumer Loans [Member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Gross carrying amount 4,876,289  
Collateral [1] 754,920  
Net exposure 4,121,369  
Expected credit loss allowance $ 284,342  
[1] According to the Bank's policy when an asset (real state) is repossessed are transferred to aseets held for sale at their fair value less cost to sell as non-financial assets at the repossession date.