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Equity (Details 2) - CLP ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Basic earnings per share      
Total attributable to the shareholders of the Bank $ 619,091 $ 595,333 $ 562,801
Weighted average number of outstanding shares 188,446,126,794 188,446,126,794 188,446,126,794
Basic earnings per share (in Ch$) $ 3.285 $ 3.159 $ 2.987
Basic earnings per share from continuing operations (in Ch$) 3.276 3.139 2.975
Basic earnings per share from discontinued operations (in Ch$) $ 0.009 $ 0.02 $ 0.015
Diluted earnings per share      
Total attributable to the shareholders of the Bank $ 619,091 $ 595,333 $ 562,801
Weighted average number of outstanding shares 188,446,126,794 188,446,126,794 188,446,126,794
Adjusted number of shares 188,446,126,794 188,446,126,794 188,446,126,794
Diluted earnings per share (in Ch$) $ 3.285 $ 3.159 $ 2.987
Diluted earnings per share from continuing operations (in Ch$) 3.276 3.139 2.975
Diluted earnings per share from discontinued operations (in Ch$) $ 0.009 $ 0.02 $ 0.015