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LOANS AND ACCOUNTS RECEIVABLE FROM CUSTOMERS and INTERBANK LOANS (under IAS 39) (Details 4)
$ in Millions
Dec. 31, 2017
CLP ($)
Impaired Portfolio [Member]  
Disclosure of financial assets [line items]  
Total $ 427,890
Impaired Portfolio [Member] | Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Total 427,890
Impaired Portfolio [Member] | Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Total
Impaired Portfolio [Member] | Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Total
Non-performing Loans (collectively evaluated) [Member]  
Disclosure of financial assets [line items]  
Total 633,461 [1]
Non-performing Loans (collectively evaluated) [Member] | Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Total 368,522 [1]
Non-performing Loans (collectively evaluated) [Member] | Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Total 161,768 [1]
Non-performing Loans (collectively evaluated) [Member] | Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Total 103,171 [1]
Other Impaired Portfolio [Member]  
Disclosure of financial assets [line items]  
Total 741,822
Other Impaired Portfolio [Member] | Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Total 217,091
Other Impaired Portfolio [Member] | Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Total 300,776
Other Impaired Portfolio [Member] | Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Total 223,955
Total Impaired Portfolio [Member]  
Disclosure of financial assets [line items]  
Total 1,803,173
Total Impaired Portfolio [Member] | Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Total 1,013,503
Total Impaired Portfolio [Member] | Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Total 462,544
Total Impaired Portfolio [Member] | Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Total $ 327,126
[1] Non-performing loans include the aggregate unpaid principal and accrued but unpaid interest on all loans with at least one installment at least 90 days past-due.