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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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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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