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Debt Instruments at Fair Value Through Other Comprehensive Income (Details 3) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost $ 16,767 $ 21,921
Fair value 19,556 24,827
Unrealized profit 2,789 3,114
Unrealized loss (209)
Foreign Financial Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 611,488 454,408
Fair value 623,159 448,459
Unrealized profit 24,190 602
Unrealized loss (12,519) (6,575)
Available for Sale Investments [Member]    
Disclosure of financial assets [line items]    
Amortized cost 3,981,088 2,387,898
Fair value 4,010,272 2,394,322
Unrealized profit 68,818 18,112
Unrealized loss (39,634) (11,688)
Time Deposits In Chilean Financial Institutions [Member] | Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 398 2,691
Fair value 398 2,693
Unrealized profit 1
Unrealized loss
Mortgage Finance Bonds Of Chilean Financial Institutions [Member] | Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 15,962 19,010
Fair value 16,748 19,227
Unrealized profit 786 426
Unrealized loss (209)
Chilean Financial Institution Bonds [Member] | Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost
Fair value
Unrealized profit
Unrealized loss
Chilean Corporate Bonds [Member] | Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost
Fair value
Unrealized profit
Unrealized loss
Other Instruments Issued in The Country [Member] | Other Chilean Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 407 220
Fair value 2,410 2,907
Unrealized profit 2,003 2,687
Unrealized loss
Foreign Central Banks And Government Securities [Member] | Foreign Financial Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 198,020 280,021
Fair value 197,685 280,622
Unrealized profit 11,110 602
Unrealized loss (11,445)
Other Foreign Financial Securities [Member] | Foreign Financial Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 413,468 174,387
Fair value 425,474 167,837
Unrealized profit 13,080
Unrealized loss (1,074) (6,575)
Chilean Central Bank And Government Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 3,352,833 1,911,569
Fair value 3,367,557 1,921,035
Unrealized profit 41,839 14,397
Unrealized loss (27,115) (4,904)
Chilean Central Bank And Government Securities [Member] | Chilean Central Bank Bonds [Member]    
Disclosure of financial assets [line items]    
Amortized cost 270,979 658,013
Fair value 272,802 657,096
Unrealized profit 3,600 3,698
Unrealized loss (1,777) (4,615)
Chilean Central Bank And Government Securities [Member] | Chilean Central Bank Notes [Member]    
Disclosure of financial assets [line items]    
Amortized cost 1,186,487 56,737
Fair value 1,186,724 56,719
Unrealized profit 237 10
Unrealized loss (27)
Chilean Central Bank And Government Securities [Member] | Other Chilean Central Bank And Government Securities [Member]    
Disclosure of financial assets [line items]    
Amortized cost 1,895,367 1,196,819
Fair value 1,908,031 1,207,220
Unrealized profit 38,002 10,689
Unrealized loss $ (25,338) $ (262)