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Derivative Instruments and Accounting Hedges - CLF assets hedged (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
item
Dec. 31, 2016
CLP ($)
item
Dec. 31, 2015
CLP ($)
CLF Assets hedged        
Accumulated amount of unrealized gain charged to equity, before tax $ 24,339 $ 14,979 $ (50,481) $ 9,971
Cash flow hedge adjustment, net   11,158 (38,366) 7,728
Cash flow hedge (Swaps) | Cash flow in CLF        
CLF Assets hedged        
Accumulated amount of unrealized gain charged to equity, before tax   14,979 (50,481) 9,971
Cash flow hedge adjustment, net   11,158 (38,366) 7,728
Accumulated amount of unrealized gain charged to equity, after deferred tax   (9,394) (20,552) 17,814
Net effect in income of derivatives   $ 93,612 $ 135,929 $ (148,555)
Number of hedges of net investments in foreign businesses | item   0 0