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Fair Value of Financial Assets and Liabilities: (Details) - Schedule of fair values of the financial assets and liabilities that are not recorded at fair value in the statement of financial position - CLP ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Financial Liabilities [Member]    
Assets    
Financial Assets $ 35,840,656 $ 33,390,035
Financial Liabilities [Member] | Current accounts and other demand deposits [Member]    
Assets    
Financial Assets 15,167,229 11,326,133
Financial Liabilities [Member] | Transactions in the course of payment [Member]    
Assets    
Financial Assets 882,944 98,869
Financial Liabilities [Member] | Obligations under repurchase agreements [Member]    
Assets    
Financial Assets 288,917 308,734
Financial Liabilities [Member] | Saving accounts and time deposits [Member]    
Assets    
Financial Assets 8,899,541 10,856,618
Financial Liabilities [Member] | Borrowings from financial institutions [Member]    
Assets    
Financial Assets 3,669,753 1,563,277
Financial Liabilities [Member] | Other financial obligations [Member]    
Assets    
Financial Assets 191,713 156,229
Financial Liabilities [Member] | Borrowings And Deposits [Member]    
Assets    
Financial Assets 29,100,097 24,309,860
Financial Liabilities [Member] | Letters of credit for residential purposes [Member]    
Assets    
Financial Assets 6,532 10,229
Financial Liabilities [Member] | Letters of credit for general purposes [Member]    
Assets    
Financial Assets 254 669
Financial Liabilities [Member] | Bonds [Member]    
Assets    
Financial Assets 7,700,402 7,912,621
Financial Liabilities [Member] | Subordinated bonds [Member]    
Assets    
Financial Assets 886,407 889,895
Financial Liabilities [Member] | Debt issued [Member]    
Assets    
Financial Assets 8,593,595 8,813,414
Financial Liabilities [Member] | Financial Liabilities [Member]    
Assets    
Financial Assets 37,693,692 33,123,274
Financial Liabilities [Member] | Cash and due from banks [Member]    
Assets    
Financial Assets 2,560,216 2,392,166
Financial Liabilities [Member] | Transactions in the course of collection [Member]    
Assets    
Financial Assets 163,252 331,420
Financial Liabilities [Member] | Investments under resale agreements [Member]    
Assets    
Financial Assets 76,407 142,329
Financial Liabilities [Member] | Cash and other transactions [Member]    
Assets    
Financial Assets 2,799,875 2,865,915
Financial Liabilities [Member] | Domestic banks [Member]    
Assets    
Financial Assets 259,788 149,974
Financial Liabilities [Member] | Central Bank of Chile [Member]    
Assets    
Financial Assets 2,380,033 630,053
Financial Liabilities [Member] | Foreign banks [Member]    
Assets    
Financial Assets 299,377 360,054
Financial Liabilities [Member] | Loans and advances to banks [Member]    
Assets    
Financial Assets 2,939,198 1,140,081
Financial Liabilities [Member] | Commercial loans [Member]    
Assets    
Financial Assets 17,120,207 16,039,411
Financial Liabilities [Member] | Residential mortgage loans [Member]    
Assets    
Financial Assets 9,352,720 9,163,019
Financial Liabilities [Member] | Consumer loans [Member]    
Assets    
Financial Assets 3,628,656 4,181,609
Financial Liabilities [Member] | Loans to Customers [Member]    
Assets    
Financial Assets 30,101,583 29,384,039
Fair Value - not measured at fair value    
Assets    
Financial Liabilities 36,492,210 34,096,829
Fair Value - not measured at fair value | Current accounts and other demand deposits [Member]    
Assets    
Financial Liabilities 15,167,229 11,326,133
Fair Value - not measured at fair value | Transactions in the course of payment [Member]    
Assets    
Financial Liabilities 882,944 98,869
Fair Value - not measured at fair value | Obligations under repurchase agreements [Member]    
Assets    
Financial Liabilities 288,917 308,734
Fair Value - not measured at fair value | Saving accounts and time deposits [Member]    
Assets    
Financial Liabilities 8,885,015 10,795,125
Fair Value - not measured at fair value | Borrowings from financial institutions [Member]    
Assets    
Financial Liabilities 3,415,959 1,555,129
Fair Value - not measured at fair value | Other financial obligations [Member]    
Assets    
Financial Liabilities 217,311 160,361
Fair Value - not measured at fair value | Borrowings And Deposits [Member]    
Assets    
Financial Liabilities 28,857,375 24,244,351
Fair Value - not measured at fair value | Letters of credit for residential purposes [Member]    
Assets    
Financial Liabilities 7,201 11,081
Fair Value - not measured at fair value | Letters of credit for general purposes [Member]    
Assets    
Financial Liabilities 280 725
Fair Value - not measured at fair value | Bonds [Member]    
Assets    
Financial Liabilities 8,390,594 8,340,272
Fair Value - not measured at fair value | Subordinated bonds [Member]    
Assets    
Financial Liabilities 1,004,196 1,004,621
Fair Value - not measured at fair value | Debt issued [Member]    
Assets    
Financial Liabilities 9,402,271 9,356,699
Fair Value - not measured at fair value | Financial Liabilities [Member]    
Assets    
Financial Liabilities 38,259,646 33,601,050
Fair Value - not measured at fair value | Cash and due from banks [Member]    
Assets    
Financial Liabilities 2,560,216 2,392,166
Fair Value - not measured at fair value | Transactions in the course of collection [Member]    
Assets    
Financial Liabilities 163,252 331,420
Fair Value - not measured at fair value | Investments under resale agreements [Member]    
Assets    
Financial Liabilities 76,407 142,329
Fair Value - not measured at fair value | Cash and other transactions [Member]    
Assets    
Financial Liabilities 2,799,875 2,865,915
Fair Value - not measured at fair value | Domestic banks [Member]    
Assets    
Financial Liabilities 259,788 149,974
Fair Value - not measured at fair value | Central Bank of Chile [Member]    
Assets    
Financial Liabilities 2,380,033 630,053
Fair Value - not measured at fair value | Foreign banks [Member]    
Assets    
Financial Liabilities 297,778 358,542
Fair Value - not measured at fair value | Loans and advances to banks [Member]    
Assets    
Financial Liabilities 2,937,599 1,138,569
Fair Value - not measured at fair value | Commercial loans [Member]    
Assets    
Financial Liabilities 16,968,143 15,988,330
Fair Value - not measured at fair value | Residential mortgage loans [Member]    
Assets    
Financial Liabilities 10,075,011 9,888,506
Fair Value - not measured at fair value | Consumer loans [Member]    
Assets    
Financial Liabilities 3,711,582 4,215,509
Fair Value - not measured at fair value | Loans to Customers [Member]    
Assets    
Financial Liabilities $ 30,754,736 $ 30,092,345