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CURRENT AND DEFERRED INCOME TAXES - Reconciliation of effective rate (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of effective rate          
Net income before taxes $ 153,606,681 $ 170,798,359 $ 140,856,204    
Tax expense at legal rate 27.00% 25.50% 24.00% 22.50% 21.00%
Tax expense at applicable tax rate $ (41,544,270) $ (43,553,581) $ (33,805,489)    
Effect of a different tax rate in other jurisdictions 967,671 (4,971,103) (9,214,270)    
Non-taxable revenues 12,752,599 9,645,068 6,068,410    
Non-deductible expenses (11,141,237) (4,020,729) (419,761)    
Tax effect on excess tax provision prior periods (295,632) 125,021 86,731    
Effect of tax restatement Chilean companies 2,566,163 (1,465,753) (1,875,343)    
Foreign subsidiaries tax withholding expense and other legal tax debits and credits (18,870,149) (7,556,557) (9,647,371)    
Adjustments to tax expense (14,988,256) (3,272,950) (5,787,334)    
Tax expense at effective rate $ (55,564,855) $ (51,797,634) $ (48,807,093)    
Effective rate 36.20% 30.60% 34.70%