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FINANCIAL RISK MANAGEMENT - Investment Risk by Country (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Exchange Rate Risk        
Total Equity $ 968,903,948 $ 863,714,743 $ 813,233,349 $ 842,170,027
Total assets 2,390,948,423 2,214,504,689 2,114,859,467  
Total liabilities 1,422,044,475 $ 1,350,789,946 $ 1,301,626,118  
Currency risk | Argentina        
Exchange Rate Risk        
Total Equity 159,998,762      
Total assets 241,470,298      
Total liabilities $ 81,471,536      
Percentage of entity's revenue 22.00%      
Appreciation (devaluation) of foreign currency against the domestic currency (32.20%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (309,180)      
Increase (decrease) in equity due to a reasonably possible risk increase (4,568,317)      
Increase (decrease) in assets due to a reasonably possible risk increase (7,801,317)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (3,233,000)      
Currency risk | Brazil        
Exchange Rate Risk        
Total Equity 327,782,367      
Total assets 958,328,527      
Total liabilities $ 630,546,160      
Percentage of entity's revenue 34.80%      
Appreciation (devaluation) of foreign currency against the domestic currency (3.60%)      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (3,959,257)      
Increase (decrease) in equity due to a reasonably possible risk increase (13,126,491)      
Increase (decrease) in assets due to a reasonably possible risk increase (40,179,105)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (27,052,614)      
Currency risk | Paraguay        
Exchange Rate Risk        
Total Equity 247,424,752      
Total assets 289,576,010      
Total liabilities $ 42,151,258      
Percentage of entity's revenue 8.90%      
Appreciation (devaluation) of foreign currency against the domestic currency 0.50%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,365,519)      
Increase (decrease) in equity due to a reasonably possible risk increase (11,749,100)      
Increase (decrease) in assets due to a reasonably possible risk increase (13,559,529)      
Increase (decrease) in liabilities due to a reasonably possible risk increase $ (1,810,429)