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Cash and cash equivalents (Details) - CLP ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash on hand $ 221,071 $ 97,228 $ 106,203  
Bank balances 64,085,358 45,389,589 41,519,788  
Cash 64,306,429 45,486,817 41,625,991  
Time deposits 600,200 4,804,224 14,955,778  
Securities purchased under resale agreements 196,319,058 102,695,758 75,447,904  
Investments in mutual funds 10,194,222 16,586,749 24,772  
Short term investments classified as cash equivalents 206,513,280 119,282,507 75,472,676  
Cash equivalents 253,236,558 124,086,731 90,428,454  
Overnight deposits 1,471,063 471,054 1,978,738  
Total other cash and cash equivalents 1,471,063 471,054 1,978,738  
Total $ 319,014,050 $ 170,044,602 $ 134,033,183 $ 192,554,239