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Fair Value of Financial Assets and Liabilities-Fair value of Financial Assets/Liabilities not measured at fair value on the balance sheet (Details) - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  | $ 1,528,234
Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | $ 33,390,035 | 30,102,202
Financial Liabilities | 33,123,274 | 29,699,243
Book Value | Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 11,326,133 | 9,584,488
Book Value | Transactions in the course of payment |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 98,869 | 44,436
Book Value | Cash collateral on securities lent and reverse repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 308,734 | 303,820
Book Value | Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 10,856,618 | 10,656,174
Book Value | Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 1,563,277 | 1,516,759
Book Value | Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 156,229 | 118,014
Book Value | Borrowings And Deposits [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 24,309,860 | 22,223,691
Book Value | Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 10,229 | 15,040
Book Value | Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 669 | 1,328
Book Value | Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 7,912,621 | 6,772,990
Book Value | Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 889,895 | 686,194
Book Value | Debt issued |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 8,813,414 | 7,475,552
Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 34,096,829 | 30,270,446
Financial liabilities at fair value | 33,601,050 | 29,838,379
Fair Value - not measured at fair value | Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 11,326,133 | 9,584,488
Fair Value - not measured at fair value | Transactions in the course of payment |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 98,869 | 44,436
Fair Value - not measured at fair value | Cash collateral on securities lent and reverse repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 308,734 | 303,820
Fair Value - not measured at fair value | Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 10,795,125 | 10,632,350
Fair Value - not measured at fair value | Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 1,555,129 | 1,506,940
Fair Value - not measured at fair value | Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 160,361 | 119,024
Fair Value - not measured at fair value | Borrowings And Deposits [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 24,244,351 | 22,191,058
Fair Value - not measured at fair value | Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 11,081 | 15,982
Fair Value - not measured at fair value | Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 725 | 1,411
Fair Value - not measured at fair value | Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 8,340,272 | 6,897,317
Fair Value - not measured at fair value | Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 1,004,621 | 732,611
Fair Value - not measured at fair value | Debt issued |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities at fair value | 9,356,699 | 7,647,321
Cash and due from banks | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 2,392,166 | 880,081
Cash and due from banks | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 2,392,166 | 880,081
Transactions in the course of collection | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 331,420 | 289,194
Transactions in the course of collection | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 331,420 | 289,194
Cash collateral on securities borrowed and reverse repurchase agreements | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 142,329 | 97,289
Cash collateral on securities borrowed and reverse repurchase agreements | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 142,329 | 97,289
Cash and other transactions | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 2,865,915 | 1,266,564
Cash and other transactions | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 2,865,915 | 1,266,564
Domestic banks | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 149,974 | 99,776
Domestic banks | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 149,974 | 99,776
Central Bank of Chile | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 630,053 | 1,100,831
Central Bank of Chile | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 630,053 | 1,100,831
Foreign banks | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 360,054 | 293,777
Foreign banks | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 358,542 | 286,063
Loans and advances to banks | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 1,140,081 | 1,494,384
Loans and advances to banks | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 1,138,569 | 1,486,670
Commercial loans | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 16,039,411 | 15,209,534
Commercial loans | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 15,988,330 | 14,949,852
Mortgage loans | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 9,163,019 | 8,017,743
Mortgage loans | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 9,888,506 | 8,451,099
Consumer loans | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 4,181,609 | 4,113,977
Consumer loans | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | 4,215,509 | 4,116,261
Loans to customers | Book Value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 29,384,039 | 27,341,254
Loans to customers | Fair Value - not measured at fair value |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets at fair value | $ 30,092,345 | $ 27,517,212

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