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FINANCIAL RISK MANAGEMENT - Investment Risk by Country (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Exchange Rate Risk        
Total Equity $ 863,714,743 $ 813,233,349 $ 842,170,027 $ 851,534,300
Total assets 2,214,504,689 2,114,859,467 2,199,109,747  
Total liabilities 1,350,789,946 $ 1,301,626,118 $ 1,356,939,720  
Currency risk | Argentina        
Exchange Rate Risk        
Total Equity 141,415,980      
Total assets 241,496,143      
Total liabilities $ 100,080,163      
Percentage of entity's revenue 24.60%      
Appreciation (devaluation) of foreign currency against the domestic currency (44.10%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,008,205)      
Increase (decrease) in equity due to a reasonably possible risk increase (4,547,092)      
Increase (decrease) in assets due to a reasonably possible risk increase (8,049,598)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (3,502,506)      
Currency risk | Brazil        
Exchange Rate Risk        
Total Equity 266,078,105      
Total assets 814,443,115      
Total liabilities $ 548,365,009      
Percentage of entity's revenue 32.30%      
Appreciation (devaluation) of foreign currency against the domestic currency (3.50%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,755,781)      
Increase (decrease) in equity due to a reasonably possible risk increase (12,297,287)      
Increase (decrease) in assets due to a reasonably possible risk increase (36,589,434)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (24,292,147)      
Currency risk | Paraguay        
Exchange Rate Risk        
Total Equity 247,867,392      
Total assets 286,061,496      
Total liabilities $ 38,194,104      
Percentage of entity's revenue 8.90%      
Appreciation (devaluation) of foreign currency against the domestic currency 6.00%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,220,490)      
Increase (decrease) in equity due to a reasonably possible risk increase (11,738,373)      
Increase (decrease) in assets due to a reasonably possible risk increase (13,360,934)      
Increase (decrease) in liabilities due to a reasonably possible risk increase $ (1,622,561)