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Net Income (Expense) From Financial Operations (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income (expense) from financial operations      
Net gains on trading derivatives $ (162,183) $ 38,217 $ (18,974)
Trading investments     10,008
Net gains on financial assets at fair value through profit or loss 11,878 9,393  
Net gains on derecognition of financial assets measured at amortised cost 63,672 8,479  
Sale of loans and accounts receivables from customers      
Current portfolio 63 (309) 3,020
Charged-off portfolio 3,248 709 3,020
Available for sale investments     8,956
Repurchase of issued bonds 3,265 [1] (840) [1] (742)
Other income (expense) from financial operations 1,892 (2,475) (2,492)
Total income (expense) $ (78,165) $ 53,174 $ 2,796
[1] The Bank repurchased its own bonds, see Note 3 for details.