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Reporting Segments (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]        
Net interest income $ 1,416,964 $ 1,414,368 $ 1,326,691  
Net fee and commission income 498,658 484,463 455,558  
Expected credit losses 323,311 317,408 302,255  
Other operating income 13,001 23,129 62,016  
Income from investments in associates and other companies 1,146 1,324 1,144  
Income tax expense 175,074 167,144 145,031  
Net income for the year 621,313 599,693 575,249  
Companies And Institutions [Member]        
Disclosure of operating segments [line items]        
Net fee and commission income 47,710 44,696    
GlobalCorporateBanking1[Member]        
Disclosure of operating segments [line items]        
Net fee and commission income 35,358 40,953    
OthersSegmentMember        
Disclosure of operating segments [line items]        
Net fee and commission income 9,754      
Retail Banking [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost   20,786,637 [1] 19,233,169 [2] $ 18,604,936 [2]
Net interest income 949,764 970,332 931,105  
Net fee and commission income 220,532 206,449 196,845  
Financial transactions, net [3] 19,694 20,595 21,141  
Expected credit losses (279,969) (293,956) (323,888)  
Support expenses [4] (553,157) (534,970) (529,909)  
Segment`s net contribution 349,094 368,450 295,294  
Middle Market [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost   7,690,380 [1] 6,775,734 [2] 6,396,376 [2]
Net interest income 272,912 264,663 244,960  
Net fee and commission income 36,746 36,280 30,851  
Financial transactions, net [3] 16,848 13,751 19,577  
Expected credit losses (38,746) (19,235) (26,748)  
Support expenses [4] (92,377) (91,882) (83,412)  
Segment`s net contribution 207,815 203,577 185,228  
Global Corporate Banking [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost   1,613,088 [1] 1,633,796 [2] 2,121,513 [2]
Net interest income 96,722 100,808 95,105  
Net fee and commission income 35,064 27,626 25,077  
Financial transactions, net [3] 57,340 50,714 55,927  
Expected credit losses 224 6,440 7,579  
Support expenses [4] (64,913) (62,685) (53,935)  
Segment`s net contribution 126,552 122,903 129,753  
Other [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost   123,309 [1] 83,215 [2] 83,606 [2]
Net interest income 94,970 (9,112) 10,196  
Net fee and commission income (6,582) 9,754 1,651  
Financial transactions, net [3] 11,200 44,692 43,713  
Expected credit losses (4,819) 4,496 974  
Support expenses [4] (11,486) (15,356) (19,649)  
Segment`s net contribution 87,533 33,428 36,885  
Total [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost   30,213,414 [1] 27,725,914 [2] 27,206,431 [2]
Net interest income 1,414,368 1,326,691 1,281,366  
Net fee and commission income 498,658 311,157 254,424  
Financial transactions, net [3] 105,082 129,752 140,358  
Expected credit losses (323,311) (302,255) (342,083)  
Support expenses [4] (721,933) (704,893) (686,905)  
Segment`s net contribution 770,994 728,358 647,160  
Other operating income 23,129 62,016 6,427  
Other operating expenses and impairment (32,381) (74,057) (69,136)  
Income from investments in associates and other companies 5,095 3,963 3,012  
Income tax expense (167,144) (145,031) (109,031)  
Net income for the year 599,693 575,249 478,432  
Individuals And PYMEs [Member]        
Disclosure of operating segments [line items]        
Net fee and commission income $ 422,172 $ 389,060    
Commercial Banking [Member]        
Disclosure of operating segments [line items]        
Loans and accounts receivable at amortised cost [2]       $ 25,001,312
Net interest income     1,176,065  
Net fee and commission income     227,696  
Financial transactions, net [3]     40,718  
Expected credit losses     (350,636)  
Support expenses [4]     (613,321)  
Segment`s net contribution     $ 480,522  
[1] Corresponds to loans and accounts receivable at amortised cost under IFRS 9, without deducting their allowances for loan losses.
[2] Corresponds to loans and accounts receivable from customers, without deducting their allowances for loan losses.
[3] Corresponds to the sum of the net income from financial operations and the foreign exchange profit or loss.
[4] Corresponds to the sum of personnel salaries and expenses, administrative expenses, depreciation and amortization.