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Equity - Dividend (Details)
$ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Mar. 22, 2018
CLP ($)
$ / shares
Mar. 23, 2017
CLP ($)
$ / shares
Dec. 31, 2018
CLP ($)
$ / shares
Dec. 31, 2017
CLP ($)
$ / shares
shares
Dec. 31, 2016
CLP ($)
$ / shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
CLP ($)
shares
Approval and payment of dividends:              
Dividends per ordinary share | $ / shares $ 3.14655951692 $ 2.92173783704 $ 3.76 $ 3.50 $ 3.81    
Dividends on ordinary shares | $ $ 374,079 $ 342,034 $ 374,079 $ 342,034 $ 366,654    
Number of shares | shares       99,444,132,192   101,017,081,114 101,017,081,114
Minimum mandatory dividend (as a percent)     30.00%        
Equity provisions for minimum dividend       $ 172,804   $ 257,298 $ 178,462
Central Bank              
Approval and payment of dividends:              
Dividends on ordinary shares | $     $ 152,930        
Number of shares | shares           29,161,400,000 29,161,400,000
Share price | $ / shares     $ 5.2442658        
Common shareholders              
Approval and payment of dividends:              
Dividends on ordinary shares | $     $ 221,149        
Number of shares | shares           70,282,700,000 70,282,700,000
Share price | $ / shares     $ 3.1465595