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INTERBANK BORROWINGS (Details 3) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings $ 1,788,626 $ 1,698,357
Loans From Foreign Financial Institutions [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings 1,787,943 1,554,071
Loans From Foreign Financial Institutions [Member] | Due Within 1 Year [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings 1,648,955 1,477,318
Loans From Foreign Financial Institutions [Member] | Due After 1 Year But Within 2 Years [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings 139,671 185,519
Loans From Foreign Financial Institutions [Member] | Due After 2 Years But Within 3 years [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings 35,035
Loans From Foreign Financial Institutions [Member] | Due After 3 Years But Within 4 Years [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings
Loans From Foreign Financial Institutions [Member] | Due After 5 Years [Member]    
Disclosure of amounts to be recovered or settled after twelve months for classes of assets and liabilities that contain amounts to be recovered or settled both no more and more than twelve months after reporting date [line items]    
Interbank borrowings