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LOANS AND ACCOUNTS RECEIVABLE FROM CUSTOMERS and INTERBANK LOANS (under IAS 39) (Details 9) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Total $ 83,315 $ 78,298
Commercial Loans [Member]    
Disclosure of financial assets [line items]    
Total 32,401 27,185
Consumer Loans [Member]    
Disclosure of financial assets [line items]    
Total 39,972 41,072
Mortgage Loans [Member]    
Disclosure of financial assets [line items]    
Total $ 10,942 $ 10,041