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Financial Assets at Fair Value through Other Comprehensive Income - Securities classified as available-for-sale (Details) - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | $ 1,366,343 | $ 1,053,191
Debt Instruments Valued At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 1,357,846 | 1,043,440
Debt Instruments Valued At Fair Value | Bonds Issued By Chilean Government And Central Bank | Instruments Issued By Chilean Government And Central Bank [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 76,358 | 135,145
Debt Instruments Valued At Fair Value | Promissory notes issued by the Chilean Government and Central Bank | Instruments Issued By Chilean Government And Central Bank [Member] |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 16,466 |
Debt Instruments Valued At Fair Value | Other Instruments | Instruments Issued By Chilean Government And Central Bank [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 16,238 | 29,077
Debt Instruments Valued At Fair Value | Other Instruments | Other Instruments Issued In Chile [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 68,476 | 107,125
Debt Instruments Valued At Fair Value | Other Instruments | Instruments Issued By Foreign Institutions [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 19,853 | 108,544
Debt Instruments Valued At Fair Value | Mortgage Bonds From Domestic Banks [Member] | Other Instruments Issued In Chile [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 122,291 | 92,491
Debt Instruments Valued At Fair Value | Bonds from domestic banks | Other Instruments Issued In Chile [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 15,927 | 5,351
Debt Instruments Valued At Fair Value | Deposits From Domestic Banks [Member] | Other Instruments Issued In Chile [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | 1,020,842 | 559,108
Debt Instruments Valued At Fair Value | Bonds From Other Chilean Companies [Member] | Other Instruments Issued In Chile [Member] | At Fair Value |  |
Disclosure of financial assets [line items] |  |
Financial assets at fair value through other comprehensive income | $ 1,395 | $ 6,599

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