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NET INCOME (EXPENSE) FROM FINANCIAL OPERATIONS (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income (expense) from financial operations      
Trading derivatives $ 38,217 $ (18,974) $ (395,209)
Trading investments   10,008 18,229
Net gains on financial assets at fair value through profit or loss 9,393    
Net gains on derecognition of financial assets measured at amortised cost 8,479    
Sale of loans and accounts receivables from customers      
Current portfolio (309) 3,020 1,469
Charged-off portfolio 709 3,020 2,720
Available for sale investments   8,956 14,598
Repurchase of issued bonds (840) (742) (8,630)
Other income (expense) from financial operations (2,475) (2,492) (211)
Total income (expense) $ 53,174 $ 2,796 $ (367,034)