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Employee Benefits (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2015
CLP ($)
Employee benefit disclosures          
Short-term personnel benefits   $ 37,868   $ 41,728 $ 34,307
Vacation accrual   25,539   25,159 25,480
Employee defined benefit plan   8,851   7,676  
Other Benefits   11,087   12,065  
Total   83,345 $ 140,760 86,628  
Staff Severance Indemnities Plan          
Employee benefit disclosures          
Employee defined benefit plan   8,851   $ 7,676 $ 10,728
Current service cost $ (86) 59      
Interest cost on benefit obligation 343 369      
Actuarial gains and losses (164) (169)      
Net benefit expense $ 93 $ 259      
Discount rate   4.29% 4.53% 4.53%  
Annual salary increase   4.56% 4.14% 4.14%  
Payment probability   99.99% 99.99% 99.99%