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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGE ACCOUNTING (Details 3) - Cash Flow Hedge [Member] - Interest rate risk [member] - CLP ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Hedging Instruments Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | $ 190,131 | $ 112,875
Hedging Instruments Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows | [1] | (118,193) | (385,626)
Hedging Instruments Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 71,938 | (272,751)
Hedged Items Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 118,193 | 385,626
Hedged Items Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (190,131) | (112,875)
Hedged Items Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (71,938) | 272,751
Due Within 1 Year [Member] | Hedging Instruments Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 125,747 | 60,733
Due Within 1 Year [Member] | Hedging Instruments Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows | [1] | (76,736) | (308,737)
Due Within 1 Year [Member] | Hedging Instruments Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 49,011 | (248,004)
Due Within 1 Year [Member] | Hedged Items Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 76,736 | 308,737
Due Within 1 Year [Member] | Hedged Items Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (125,747) | (60,733)
Due Within 1 Year [Member] | Hedged Items Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (49,011) | 248,004
Between 1 and 3 years [Member] | Hedging Instruments Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 46,372 | 43,507
Between 1 and 3 years [Member] | Hedging Instruments Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows | [1] | (35,994) | (60,515)
Between 1 and 3 years [Member] | Hedging Instruments Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 10,378 | (17,008)
Between 1 and 3 years [Member] | Hedged Items Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 35,994 | 60,515
Between 1 and 3 years [Member] | Hedged Items Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (46,372) | (43,507)
Between 1 and 3 years [Member] | Hedged Items Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (10,378) | 17,008
Between 3 and 6 years [Member] | Hedging Instruments Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 13,311 | 7,757
Between 3 and 6 years [Member] | Hedging Instruments Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows | [1] | (3,062) | (13,780)
Between 3 and 6 years [Member] | Hedging Instruments Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 10,249 | (6,023)
Between 3 and 6 years [Member] | Hedged Items Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 3,062 | 13,780
Between 3 and 6 years [Member] | Hedged Items Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (13,311) | (7,757)
Between 3 and 6 years [Member] | Hedged Items Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (10,249) | 6,023
Over 6 years [Member] | Hedging Instruments Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 4,701 | 878
Over 6 years [Member] | Hedging Instruments Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows | [1] | (2,401) | (2,594)
Over 6 years [Member] | Hedging Instruments Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 2,300 | (1,716)
Over 6 years [Member] | Hedged Items Inflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | 2,401 | 2,594
Over 6 years [Member] | Hedged Items Outflows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | (4,701) | (878)
Over 6 years [Member] | Hedged Items Net flows [Member] |  |  |
Disclosure of detailed information about hedges [line items] |  |  |
Forecasted cash flows |  | $ (2,300) | $ 1,716
[1] | Only includes cash flow forecast portion of the hedge instruments used to cover interest rate risk.

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