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Intangible Assets - Gross Balance (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 intangible assets        
Intangible assets and goodwill at beginning of period   $ 65,036 $ 64,700  
Impairment loss (*)       $ (59)
Intangible assets and goodwill at end of period $ 117,731 72,455 65,036 64,700
Goodwill generated in the business combination   16,714 16,714  
Citibank Chile        
Changes in intangible assets        
Goodwill generated in the business combination   12,576    
Gross Balance        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   199,977 190,486 182,711
Acquisitions   18,779 11,248 8,519
Disposals   (5,790) (1,757) (685)
Impairment loss (*)       (59)
Intangible assets and goodwill at end of period   212,966 199,977 190,486
Goodwill        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   16,714 16,714  
Intangible assets and goodwill at end of period   16,714 16,714 16,714
Goodwill | Gross Balance        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   16,714 16,714 16,714
Intangible assets and goodwill at end of period   16,714 16,714 16,714
Intangible assets arising from business combinations        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   18,981 21,267  
Intangible assets and goodwill at end of period   16,696 18,981 21,267
Intangible assets arising from business combinations | Gross Balance        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   56,249 56,249 56,249
Intangible assets and goodwill at end of period   56,249 56,249 56,249
Software or computer programs        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   29,341 26,719  
Intangible assets and goodwill at end of period   39,045 29,341 26,719
Software or computer programs | Gross Balance        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   127,014 117,523 109,748
Acquisitions   18,779 11,248 8,519
Disposals   (5,790) (1,757) (685)
Impairment loss (*)       (59)
Intangible assets and goodwill at end of period   $ 140,003 $ 127,014 $ 117,523