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Expected Credit Losses Allowance (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Charged-off individually significant loans     $ 51,978
Total provisions and charge-offs     (36,279)
Provisions released $ (207,693) $ (210,781) (55,018)
Net charge offs of individually significant loans     15,699
Personnel Salaries And Expenses [Member]      
Disclosure of financial assets [line items]      
Provisions released    
Mandatory Dividends [Member]      
Disclosure of financial assets [line items]      
Provisions released    
Contingencies [Member]      
Disclosure of financial assets [line items]      
Provisions released     (46,357)
Loans to Customers [Member] | Provisions for Loan Losses [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans     (15,699)
Provisions established     (516,646)
Total provisions and charge-offs     (532,345)
Provisions released     146,563
Recovery of loans previously charged off     83,527
Net charge offs of individually significant loans     (302,255)
Loans to Customers [Member] | Commercial Loans [Member] | Provisions for Loan Losses [Member] | Group Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (148,681)
Total provisions and charge-offs     (148,681)
Provisions released     20,491
Recovery of loans previously charged off     21,499
Net charge offs of individually significant loans     (106,691)
Loans to Customers [Member] | Commercial Loans [Member] | Provisions for Loan Losses [Member] | Individual Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans     (15,699)
Provisions established     (64,658)
Total provisions and charge-offs     (80,357)
Provisions released     55,925
Recovery of loans previously charged off     11,114
Net charge offs of individually significant loans     (13,318)
Loans to Customers [Member] | Mortgage Loans [Member] | Provisions for Loan Losses [Member] | Group Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (43,621)
Total provisions and charge-offs     (43,621)
Provisions released     11,427
Recovery of loans previously charged off     10,942
Net charge offs of individually significant loans     (21,252)
Loans to Customers [Member] | Consumer Loans [Member] | Provisions for Loan Losses [Member] | Group Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (252,038)
Total provisions and charge-offs     (252,038)
Provisions released     46,089
Recovery of loans previously charged off     39,972
Net charge offs of individually significant loans     (165,977)
Loans to Customers [Member] | Contingent Loan [Member] | Provisions for Loan Losses [Member] | Group Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (4,224)
Total provisions and charge-offs     (4,224)
Provisions released     1,660
Recovery of loans previously charged off    
Net charge offs of individually significant loans     (2,564)
Loans to Customers [Member] | Contingent Loan [Member] | Provisions for Loan Losses [Member] | Individual Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (3,117)
Total provisions and charge-offs     (3,117)
Provisions released     7,001
Recovery of loans previously charged off    
Net charge offs of individually significant loans     3,884
Loans to Customers [Member] | Interbank Loan [Member] | Provisions for Loan Losses [Member] | Individual Allowance [Member]      
Disclosure of financial assets [line items]      
Charged-off individually significant loans    
Provisions established     (307)
Total provisions and charge-offs     (307)
Provisions released     3,970
Recovery of loans previously charged off    
Net charge offs of individually significant loans     $ 3,663