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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGE ACCOUNTING (Details 5) - Cash Flow Hedge [Member] - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of detailed information about hedges [line items] |  |
Net flows | $ 9,803 | $ (3,562)
Interbank borrowings [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows | 309 | (4,779)
Time deposits and other time liabilities [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows |  |
Issued debt instruments [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows | (10,893) | (8,683)
Available For Sale Investments [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows |  | (364)
Loans and accounts receivables from customers [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows |  | 10,264
Loans And Accounts Receivable At Amortised Cost [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows | 21,779 |
Debt Instruments At FVOCI [Member] |  |
Disclosure of detailed information about hedges [line items] |  |
Net flows | $ (1,392) |

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