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Fair Value of Financial Assets and Liabilities-Estimated Fair Value (Details) - Fair Value - not measured at fair value - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | $ 34,096,829 | $ 30,270,446
Financial Liabilities | 33,601,050 | 29,838,379
Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 11,326,133 | 9,584,488
Current and saving accounts and other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 24,244,351 | 22,191,058
Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 1,555,129 | 1,506,940
Cash collateral on securities lent and reverse repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 308,734 | 303,820
Debt issued |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 9,356,699 | 7,647,321
Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 725 | 1,411
Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 11,081 | 15,982
Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 160,361 | 119,024
Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 10,795,125 | 10,632,350
Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 1,004,621 | 732,611
Transactions in the course of payment |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 98,869 | 44,436
Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 8,340,272 | 6,897,317
Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 3,645,942 | 2,467,171
Financial Liabilities |  | 9,932,744
Level 1 | Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 11,326,133 | 9,584,488
Level 1 | Current and saving accounts and other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 9,932,744
Level 1 | Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Cash collateral on securities lent and reverse repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 303,820
Level 1 | Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Transactions in the course of payment |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 98,869 | 44,436
Level 1 | Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 1 | Debt Issued [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  | 27,803,275
Financial Liabilities |  | 12,990,925
Level 3 | Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 3 | Current and saving accounts and other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 12,258,314
Level 3 | Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities | 1,555,129 | 1,506,940
Level 3 | Debt issued |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities | 1,004,621 | 732,611
Level 3 | Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 3 | Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 3 | Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 160,361 | 119,024
Level 3 | Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 10,632,350
Level 3 | Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities | 1,004,621 | 732,611
Level 3 | Transactions in the course of payment |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 3 | Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities | 8,352,078 | 6,914,710
Level 2 | Current accounts and other demand deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 | Borrowings from financial institutions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 | Debt issued |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities | 8,352,078 | 6,914,710
Level 2 | Letters of credit for general purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 1,411
Level 2 | Letters of credit for residential purposes |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 15,982
Level 2 | Other financial obligations |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 | Saving accounts and time deposits |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 | Subordinated bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Level 2 | Bonds |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Financial Liabilities |  | 6,897,317
Cash and due from banks |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 2,392,166 | 880,081
Cash and due from banks | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 2,392,166 | 880,081
Cash and due from banks | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Cash and due from banks | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Transactions in the course of collection |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 331,420 | 289,194
Transactions in the course of collection | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 331,420 | 289,194
Transactions in the course of collection | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Transactions in the course of collection | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Cash and other transactions |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 2,865,915 | 1,266,564
Cash and other transactions | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  | 1,266,564
Domestic banks |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 149,974 | 99,776
Domestic banks | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 149,974 | 99,776
Domestic banks | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Domestic banks | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Mortgages |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 9,888,506 | 8,451,099
Mortgages | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Mortgages | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  | 8,451,099
Consumer loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 4,215,509 | 4,116,261
Consumer loans | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Consumer loans | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  | 4,116,261
Financial Liabilities |  |
Loans to Customers at amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 30,092,345 | 27,517,212
Loans to Customers at amortized cost | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Loans to Customers at amortized cost | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  | 27,517,212
Foreign banks |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 358,542 | 286,063
Foreign banks | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Foreign banks | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 358,542 | 286,063
Foreign banks | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Central Bank of Chile |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 630,053 | 1,100,831
Central Bank of Chile | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 630,053 | 1,100,831
Central Bank of Chile | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Central Bank of Chile | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Loans and advances to banks |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 1,138,569 | 1,486,670
Loans and advances to banks | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 780,027 | 1,200,607
Loans and advances to banks | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 358,542 | 286,063
Loans and advances to banks | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Commercial loans |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 15,988,330 | 14,949,852
Commercial loans | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Commercial loans | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 15,988,330 | 14,949,852
Cash collateral on securities borrowed and reverse repurchase agreements |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 142,329 | 97,289
Cash collateral on securities borrowed and reverse repurchase agreements | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Investments under resale agreements [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 142,329 | 97,289
Investments under resale agreements [Member] | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 142,329 | 97,289
Investments under resale agreements [Member] | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Investments under resale agreements [Member] | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets |  |
Obligations under repurchase agreements [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Assets | 308,734 | 303,820
Obligations under repurchase agreements [Member] | Level 1 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities | 308,734 | 303,820
Obligations under repurchase agreements [Member] | Level 3 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Level 2 |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial Liabilities |  |

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