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Accounting Changes (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Total financial assets measured at amortised cost $ 31,775,420 $ 29,331,001
Total financial assets measured at FVOCI 4,010,272 $ 2,394,323
IFRS 9 [Member]    
Disclosure of financial assets [line items]    
Total financial assets measured at amortised cost 28,182,511  
Total financial assets measured at FVOCI 2,683,176  
Total financial assets measured at FVTPL 2,274,383  
IAS 39 [Member]    
Disclosure of financial assets [line items]    
Total financial assets measured at amortised cost 28,387,679  
Total financial assets measured at FVOCI 2,574,969  
Total financial assets measured at FVTPL 2,724,383  
Remeasurement [Member]    
Disclosure of financial assets [line items]    
Total financial assets measured at amortised cost (97,322)  
Total financial assets measured at FVOCI 361  
Reclassification [Member]    
Disclosure of financial assets [line items]    
Total financial assets measured at amortised cost (107,846)  
Total financial assets measured at FVOCI 107,846  
Loans And Accounts Receivable From Customers [Member] | Fair Value Through Other Comprehensive Income [Member]    
Disclosure of financial assets [line items]    
Addition: from amortised cost (net of allowance) 107,846  
Remeasurement: ECL Allowance 291  
Remeasurement: from cost to FV (236)  
Subtraction to FVOCI (net of allowance) 55  
Closing balance under IFRS 9 107,846  
Total financial assets measured at amortised cost 107,901  
Available For Sale Investments [Member] | Fair Value Through Other Comprehensive Income [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 2,574,546  
Addition: from interbank loans  
Closing balance under IFRS 9 2,574,546  
Investment In Associate And Other Companies Stock Exchange [Member] | Fair Value Through Other Comprehensive Income [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 287  
Closing balance under IFRS 9 287  
Investment In Associate And Other Companies Bladex [Member] | Fair Value Through Other Comprehensive Income [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 136  
Remeasurement: from cost to FV 306  
Subtraction to FVOCI (net of allowance) 306  
Closing balance under IFRS 9 136  
Total financial assets measured at amortised cost 442  
Derivatives Contracts [Member] | Financial assets at fair value through profit or loss, category [Member]    
Disclosure of financial assets [line items]    
Closing balance under IFRS 9 2,238,647  
Trading Investment [Member] | Financial assets at fair value through profit or loss, category [Member]    
Disclosure of financial assets [line items]    
Closing balance under IFRS 9 485,736  
Amortised Cost [Member] | Cash And Deposit In Banks [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 1,452,922  
Addition: from interbank loans  
Closing balance under IFRS 9 1,452,922  
Amortised Cost [Member] | Loans And Accounts Receivable From Customers [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 26,772,544  
Addition: from interbank loans 162,213  
Remeasurement: ECL Allowance (97,322)  
Subtraction to FVOCI (net of allowance) (107,846)  
Closing balance under IFRS 9 26,729,589  
Amortised Cost [Member] | Interbank Loans Net [Member]    
Disclosure of financial assets [line items]    
Opening balance under IAS 39 162,213  
Remeasurement: ECL Allowance (162,213)  
Closing balance under IFRS 9