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Investments Under Resale Agreements and Obligations Under Repurchase Agreements (Details) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing $ 102,057 $ 73,496
Over 1 month and up to 3 months    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 29,393 16,918
Over 3 months and up to 12 months [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 10,879 6,875
Instruments Issued By Chilean Government And Central Bank [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 29,643 742
Instruments Issued By Chilean Government And Central Bank [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 29,643 742
Other Instruments Issued In Chile [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 112,686 96,547
Other Instruments Issued In Chile [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 72,414 72,754
Other Instruments Issued In Chile [Member] | Over 1 month and up to 3 months    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 29,393 16,918
Other Instruments Issued In Chile [Member] | Over 3 months and up to 12 months [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 10,879 6,875
Central Bank promissory notes | Instruments Issued By Chilean Government And Central Bank [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 742
Central Bank promissory notes | Instruments Issued By Chilean Government And Central Bank [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 742
Bonds from domestic banks | Other Instruments Issued In Chile [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 15,407 367
Bonds from domestic banks | Other Instruments Issued In Chile [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 15,407 367
Deposits in domestic banks [Member] | Other Instruments Issued In Chile [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing   2,053
Deposits in domestic banks [Member] | Other Instruments Issued In Chile [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing   2,053
Other Instruments | Other Instruments Issued In Chile [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 97,279 94,127
Other Instruments | Other Instruments Issued In Chile [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 57,007 70,334
Other Instruments | Other Instruments Issued In Chile [Member] | Over 1 month and up to 3 months    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 29,393 16,918
Other Instruments | Other Instruments Issued In Chile [Member] | Over 3 months and up to 12 months [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 10,879 $ 6,875
Central Bank bonds [Member] | Instruments Issued By Chilean Government And Central Bank [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 11,184  
Central Bank bonds [Member] | Instruments Issued By Chilean Government And Central Bank [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 11,184  
Other instruments issued by the Chilean Government and Central Bank [Member] | Instruments Issued By Chilean Government And Central Bank [Member]    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing 18,459  
Other instruments issued by the Chilean Government and Central Bank [Member] | Instruments Issued By Chilean Government And Central Bank [Member] | Up to 1 month    
Receivables from repurchase agreements and security borrowings [Line Items]    
Receivables from repurchase agreements and security borrowing $ 18,459