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Provisions - Changes in Provisions (Details)
$ in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Changes in provisions        
Beginning Balance   $ 187,568 $ 182,832 $ 185,643
Provisions established   172,804 172,555 174,760
Provisions used   (165,675) (167,699) (177,571)
Provisions released   (160) (120)  
Ending Balance $ 316,099 194,537 187,568 182,832
Minimum dividends        
Changes in provisions        
Beginning Balance   165,675 167,699 177,324
Provisions established   172,804 165,675 167,699
Provisions used   (165,675) (167,699) (177,324)
Ending Balance   172,804 165,675 167,699
Contingencies        
Changes in provisions        
Beginning Balance   21,893 15,133 8,319
Provisions established     6,880 7,061
Provisions used       (247)
Provisions released   (160) (120)  
Ending Balance   $ 21,733 $ 21,893 $ 15,133