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PROVISIONS AND CONTINGENT PROVISIONS (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]    
Balance at beginning $ 303,798 $ 292,210
Provisions established   291,513
Application of provisions (224,907)
Provisions released (55,018)
Reclassifications  
Other  
Balance at end 305,271 303,798
Personnel Salaries And Expenses [Member]    
Disclosure of other provisions [line items]    
Balance at beginning 97,576 72,592
Provisions established 80,912 106,687
Application of provisions (72,975) (81,703)
Provisions released (3,195)
Reclassifications
Other (8,939)
Balance at end 93,379 97,576
Mandatory Dividends [Member]    
Disclosure of other provisions [line items]    
Balance at beginning 168,840 142,815
Provisions established 178,600 168,840
Application of provisions (142,815)
Provisions released (168,840)
Reclassifications
Other
Balance at end 178,600 168,840
Contingencies [Member]    
Disclosure of other provisions [line items]    
Balance at beginning 27,303 65,404
Provisions established 19,447 8,645
Application of provisions (4,431) (389)
Provisions released (33,356) (46,357)
Reclassifications
Other
Balance at end $ 8,963 $ 27,303