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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGE ACCOUNTING (Details 5) - Cash Flow Hedge [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about hedges [line items]    
Net flows $ 9,803 $ (3,562)
Interbank borrowings [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows 309 (4,779)
Time deposits and other time liabilities [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows
Issued debt instruments [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows (10,893) (8,683)
Available For Sale Investments [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows (364)
Loans and accounts receivables from customers [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows 10,264
Loans And Accounts Receivable At Amortised Cost [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows 21,779
Debt Instruments At FVOCI [Member]    
Disclosure of detailed information about hedges [line items]    
Net flows $ (1,392)