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Cash and cash equivalents (Details) - CLP ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash $ 97,228 $ 106,203 $ 12,712  
Overnight deposits 471,054 1,978,738 462,873  
Bank balances 45,389,589 41,519,788 42,370,367  
Time deposits 4,804,224 14,955,778 32,639,373  
Investments in mutual funds 16,586,749 24,772 0  
Securities purchased under resale agreements 102,695,758 75,447,904 117,068,914  
Total $ 170,044,602 $ 134,033,183 $ 192,554,239 $ 214,774,876