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Intangible Assets - Gross Balance (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   $ 72,455 $ 65,036  
Intangible assets and goodwill at end of period $ 123,228 85,471 72,455 $ 65,036
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   195,443 182,454 172,963
Acquisitions   23,512 18,779 11,248
Disposals   (1,024) (5,790) (1,757)
Intangible assets and goodwill at end of period   217,931 195,443 182,454
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   16,696 18,981  
Intangible assets and goodwill at end of period   16,696 16,696 18,981
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   39,045 29,341  
Intangible assets and goodwill at end of period   52,061 39,045 29,341
Software or computer programs | Gross Balance        
Changes in intangible assets        
Intangible assets and goodwill at beginning of period   122,480 109,491 100,000
Acquisitions   23,512 18,779 11,248
Disposals   (1,024) (5,790) (1,757)
Intangible assets and goodwill at end of period   $ 144,968 $ 122,480 $ 109,491