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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
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