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INTEREST INCOME (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting $ 2,243,123 $ 2,031,133 $ 2,123,422
Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 1,775,256 1,773,066 1,739,427
Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 449,784 242,390 365,006
Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 18,083 15,677 18,989
Resale Agreements [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 903 939 1,488
Resale Agreements [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 903 939 1,488
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 897 969 295
Interbank Loan [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 897 969 295
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 936,264 847,927 880,995
Commercial Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 771,405 752,013 742,432
Commercial Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 153,851 85,389 130,904
Commercial Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 11,008 10,525 7,659
Mortgage Loans [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 597,655 469,758 539,209
Mortgage Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 330,055 320,041 304,116
Mortgage Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 266,691 149,303 228,081
Mortgage Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 909 414 7,012
Consumer Loans [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 586,534 618,033 609,130
Consumer Loans [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 579,929 612,932 604,152
Consumer Loans [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 439 363 660
Consumer Loans [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 6,166 4,738 4,318
Investment Instruments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 100,213 79,797 78,724
Investment Instruments [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 75,423 74,000 75,808
Investment Instruments [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 24,790 5,797 2,916
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 20,657 13,710 13,581
Other Interest Income [Member] | Hedged Of Interest [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 16,644 12,172 11,136
Other Interest Income [Member] | Hedged Of Inflation Adjustments [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting 4,013 1,538 2,445
Other Interest Income [Member] | Hedged Of Prepaid Fees [Member]      
Disclosure of financial assets [line items]      
Interest income not including income from hedge accounting