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Interest Income (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting $ 2,314,637 $ 2,243,123 $ 2,031,133
Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 1,815,170 1,775,256 1,773,066
Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 474,427 449,784 242,390
Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 25,040 18,083 15,677
Resale Agreements [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 718 903 939
Resale Agreements [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 718 903 939
Resale Agreements [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting
Resale Agreements [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting
Interbank Loan [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 1,263 897 969
Interbank Loan [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 1,263 897 969
Interbank Loan [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting
Interbank Loan [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting
Commercial Loans [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 957,224 936,264 847,927
Commercial Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 780,284 771,405 752,013
Commercial Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 160,462 153,851 85,389
Commercial Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 16,478 11,008 10,525
Mortgage Loans [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 633,938 597,655 469,758
Mortgage Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 349,663 330,055 320,041
Mortgage Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 283,820 266,691 149,303
Mortgage Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 455 909 414
Consumer Loans [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 602,196 586,534 618,033
Consumer Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 593,705 579,929 612,932
Consumer Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 384 439 363
Consumer Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 8,107 6,166 4,738
Investment Instruments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 97,319 100,213 79,797
Investment Instruments [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 71,150 75,423 74,000
Investment Instruments [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 26,169 24,790 5,797
Investment Instruments [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting
Other Interest Income [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 21,979 20,657 13,710
Other Interest Income [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 18,387 16,644 12,172
Other Interest Income [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 3,592 4,013 1,538
Other Interest Income [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting