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INCOME TAX EXPENSE AND DEFERRED TAXES - Reconciliation of the tax expense using the statutory rate with the tax expense using the effective rate (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of the tax expense using the statutory rate with the tax expense using the effective rate      
Net income before taxes $ 178,022,719 $ 236,413,116 $ 153,015,601
Tax expense at legal rate (27.0%) (48,066,134) (63,831,541) (41,314,212)
Effect of a different tax rate in other jurisdictions 1,032,950 (3,471,705) 967,671
Non-taxable revenues (2,417,582) 9,507,807 12,522,541
Non-deductible expenses (6,007,898) (4,664,045) (11,141,237)
Reversal of tax provision 113,747 (3,316,278) (295,632)
Effect of monetary tax restatement Chilean companies (5,936,464) 5,199,589 2,566,163
Foreign subsidiaries tax withholding expense and other legal tax debits and credits 6,375,982 (590,718) (18,870,149)
Adjustments to tax expense (7,872,215) 6,136,355 (15,218,314)
Tax expense at effective rate $ (54,905,399) $ (61,166,891) $ (55,564,855)
Effective rate 30.80% 25.90% 36.30%