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Equity - Dividend (Details)
$ / shares in Units, $ in Thousands, $ in Millions
 12 Months Ended
Mar. 23, 2017
CLP ($)
$ / shares
Mar. 24, 2016
CLP ($)
$ / shares
Dec. 31, 2017
CLP ($)
$ / shares
Dec. 31, 2016
CLP ($)
$ / shares
shares
Dec. 31, 2015
CLP ($)
$ / shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
CLP ($)
shares
Approval and payment of dividends:              
Dividends per ordinary share | $ / shares $ 2.92173783704 $ 3.37534954173 $ 3.50 $ 3.81 $ 3.88    
Dividends on ordinary shares | $ $ 342,034 $ 366,654 $ 342,034 $ 366,654 $ 367,445    
Number of shares | shares       97,624,347,430   99,444,132,192 99,444,132,192
Minimum mandatory dividend (as a percent)     30.00%        
Equity provisions for minimum dividend       $ 165,675   $ 280,786 $ 172,804
Central Bank              
Approval and payment of dividends:              
Dividends on ordinary shares | $     $ 142,003        
Number of shares | shares           29,161,400,000 29,161,400,000
Share price | $ / shares     $ 4.8695630        
Common shareholders              
Approval and payment of dividends:              
Dividends on ordinary shares | $     $ 200,031        
Number of shares | shares           68,462,900,000 68,462,900,000
Share price | $ / shares     $ 2.9217378