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Current Taxes and Deferred Taxes - Reconciliation of effective tax rate (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Dec. 31, 2014
Tax rate %            
Income tax calculated on net income before tax (as a percent) 27.00% 25.50% 25.50% 24.00% 22.50% 21.00%
Subordinated Debt Payment (as a percent)   (5.67%) (5.67%) (5.05%) (4.57%)  
Additions or deductions (as a percent)   (2.88%) (2.88%) (3.90%) (3.91%)  
Tax from previous years (as a percent)   (0.20%) (0.20%) 0.15% (0.27%)  
Effect of changes in tax rate (as a percent)   (0.83%) (0.83%) (1.36%) (2.63%)  
Other (as a percent)   0.87% 0.87% 1.00% 0.77%  
Effective rate and income tax expense (as a percent)   16.79% 16.79% 14.84% 11.89%  
Credit to Income for tax rate change            
Income tax calculated on net income before tax     $ 175,298 $ 162,063 $ 155,751  
Subordinated Debt Payment     (38,997) (34,092) (31,638)  
Additions or deductions     (19,794) (26,332) (27,032)  
Tax from previous years     (1,401) 1,030 (1,851)  
Effect of changes in tax rate     (5,729) (9,158) (18,234)  
Other     5,984 6,701 5,325  
Total tax expense (income)   $ 187,448 $ 115,361 $ 100,212 $ 82,321  
First category tax percentage   65 65      
Non-deductible expenses tax rate   40.00% 40.00% 35.00%