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Property and Equipment - Cost (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   $ 219,082    
Impairment loss   (166) $ (274) $ (204)
Property, plant and equipment at end of period $ 351,395 216,259 219,082  
Charge-off provisions for Property and Equipment   163 229  
Gross Balance        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   532,913 508,000  
Additions   23,224 27,819  
Disposals/write-downs   (7,785) (2,861)  
Accumulated depreciation   (332,090) (313,831)  
Impairment loss   (3) (45)  
Property, plant and equipment after considering accumulated depreciation   216,259 219,082  
Property, plant and equipment at end of period     532,913 508,000
Gross Balance | Land and Buildings        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   302,187 292,166  
Additions   10,606 10,174  
Disposals/write-downs   (1,365) (138)  
Accumulated depreciation   (142,768) (134,900)  
Impairment loss     (15)  
Property, plant and equipment after considering accumulated depreciation   168,660 167,287  
Property, plant and equipment at end of period     302,187 292,166
Gross Balance | Equipment        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   180,322 167,874  
Additions   8,898 14,105  
Disposals/write-downs   (4,851) (1,653)  
Accumulated depreciation   (148,006) (139,277)  
Impairment loss     (4)  
Property, plant and equipment after considering accumulated depreciation   36,363 41,045  
Property, plant and equipment at end of period     180,322 167,874
Gross Balance | Other        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   50,404 47,960  
Additions   3,720 3,540  
Disposals/write-downs   (1,569) (1,070)  
Accumulated depreciation   (41,316) (39,654)  
Impairment loss   (3) (26)  
Property, plant and equipment after considering accumulated depreciation   $ 11,236 10,750  
Property, plant and equipment at end of period     $ 50,404 $ 47,960