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Interest Income (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting $ (866,327) $ (809,956) $ (719,850)
Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (680,827) (629,467) (617,200)
Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (185,500) (180,489) (102,650)
Demand Deposits [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (15,526) (16,285) (14,546)
Demand Deposits [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (14,018) (14,914) (13,851)
Demand Deposits [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (1,508) (1,371) (695)
Repurchase Agreements [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (9,710) (6,439) (6,514)
Repurchase Agreements [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (9,710) (6,439) (6,514)
Repurchase Agreements [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting
Time Deposits And Liabilities [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (362,479) (352,345) (362,330)
Time Deposits And Liabilities [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (335,307) (317,061) (341,821)
Time Deposits And Liabilities [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (27,172) (35,284) (20,509)
Interbank Loan [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (50,354) (39,971) (26,805)
Interbank Loan [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (50,354) (39,971) (26,805)
Interbank Loan [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting
Issued Debt Instruments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (395,999) (374,682) (296,197)
Issued Debt Instruments [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (250,512) (241,455) (220,027)
Issued Debt Instruments [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (145,487) (133,227) (76,170)
Other financial liabilities [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (1,343) (2,808) (3,249)
Other financial liabilities [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (1,310) (2,698) (2,946)
Other financial liabilities [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (33) (110) (303)
Lease contracts [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (2,965)
Lease contracts [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (2,965)
Lease contracts [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting
Other Interest Expense [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (27,951) (17,426) (10,209)
Other Interest Expense [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting (16,651) (6,929) (5,236)
Other Interest Expense [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest expense not including expenses from hedge accounting $ (11,300) $ (10,497) $ (4,973)