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EXPECTED CREDIT LOSSESS ALLOWANCE (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]      
Charged-off individually significant loans   $ 51,978 $ 47,605
Total provisions and charge-offs   (36,279) (36,383)
Provisions released (55,018)  
Net charge offs of individually significant loans   15,699 11,222
Provisions for Loan Losses [Member] | Loans to Customers [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans   (15,699) (11,222)
Provisions established   (516,646) (544,240)
Total provisions and charge-offs   (532,345) (555,462)
Provisions released   146,563 135,081
Recovery of loans previously charged off   83,527 78,298
Net charge offs of individually significant loans   (302,255) (342,083)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Individual Allowance [Member] | Interbank Loan [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (307) (3,052)
Total provisions and charge-offs   (307) (3,052)
Provisions released   3,970 83
Recovery of loans previously charged off  
Net charge offs of individually significant loans   3,663 (2,969)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Individual Allowance [Member] | Commercial Loans [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans   (15,699) (11,222)
Provisions established   (64,658) (61,002)
Total provisions and charge-offs   (80,357) (72,224)
Provisions released   55,925 43,183
Recovery of loans previously charged off   11,114 11,142
Net charge offs of individually significant loans   (13,318) (17,899)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Individual Allowance [Member] | Contingent Loan [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (3,117) (11,986)
Total provisions and charge-offs   (3,117) (11,986)
Provisions released   7,001 6,963
Recovery of loans previously charged off  
Net charge offs of individually significant loans   3,884 (5,023)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Group Allowance [Member] | Commercial Loans [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (148,681) (133,855)
Total provisions and charge-offs   (148,681) (133,855)
Provisions released   20,491 14,432
Recovery of loans previously charged off   21,499 16,043
Net charge offs of individually significant loans   (106,691) (103,380)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Group Allowance [Member] | Mortgage Loans [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (43,621) (50,892)
Total provisions and charge-offs   (43,621) (50,892)
Provisions released   11,427 34,246
Recovery of loans previously charged off   10,942 10,041
Net charge offs of individually significant loans   (21,252) (6,605)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Group Allowance [Member] | Consumer Loans [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (252,038) (280,544)
Total provisions and charge-offs   (252,038) (280,544)
Provisions released   46,089 30,790
Recovery of loans previously charged off   39,972 41,072
Net charge offs of individually significant loans   (165,977) (208,682)
Provisions for Loan Losses [Member] | Loans to Customers [Member] | Group Allowance [Member] | Contingent Loan [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans  
Provisions established   (4,224) (2,909)
Total provisions and charge-offs   (4,224) (2,909)
Provisions released   1,660 5,384
Recovery of loans previously charged off  
Net charge offs of individually significant loans   $ (2,564) $ 2,475