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LOANS AND ACCOUNTS RECEIVABLE FROM CUSTOMERS and INTERBANK LOANS (under IAS 39) (Details 8) $ in Millions | 12 Months Ended
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Dec. 31, 2017 CLP ($)
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | $ 1,440 |
Total Provision [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Beginning | 786,470 |
Allowances established | 508,998 | [1]
Allowances released | (133,932) | [2]
Charge-offs | (370,851) | [3]
Balance Ending | 790,685 |
Commercial Loans [Member] | Individual Allowance [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Beginning | 246,336 |
Allowances established | 64,658 | [1]
Allowances released | (55,925) | [2]
Charge-offs | (36,279) | [3]
Balance Ending | 218,790 |
Commercial Loans [Member] | Group Allowance [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Beginning | 183,106 |
Allowances established | 148,681 | [1]
Allowances released | (20,491) | [2]
Charge-offs | (92,223) | [3]
Balance Ending | 219,073 |
Commercial Loans [Member] | Total Provision [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | 437,863 |
Mortgage Loans [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | 69,066 |
Mortgage Loans [Member] | Group Allowance [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Beginning | 57,009 |
Allowances established | 43,621 | [1]
Allowances released | (11,427) | [2]
Charge-offs | (20,137) | [3]
Balance Ending | 69,066 |
Mortgage Loans [Member] | Total Provision [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | 69,066 |
Consumer Loans [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | 283,756 |
Consumer Loans [Member] | Group Allowance [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Beginning | 300,019 |
Allowances established | 252,038 | [1]
Allowances released | (46,089) | [2]
Charge-offs | (222,212) | [3]
Balance Ending | 283,756 |
Consumer Loans [Member] | Total Provision [Member] |  |
Changes in allowance account for credit losses of financial assets [Roll Forward] |  |
Balance Ending | $ 283,756 |
[1] | Represents gross allowances made in respect of increased risk of loss during the period and loan growth,
[2] | Represents the gross amount of loan loss allowances released during the year as a consequence of reduction in the level of risk existing in the loan portfolio, including as a result of improvement in the credit risk classification of borrowers and loans paid,
[3] | Represents the gross amount of loan loss allowances removed due to charge-off,

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