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FINANCIAL RISK MANAGEMENT - Investment Risk by Country (Details) - CLP ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Exchange Rate Risk        
Total Equity $ 831,560,591 $ 968,903,948 $ 863,714,743 $ 813,233,349
Total assets 2,448,064,400 2,390,948,423 2,214,504,689  
Total liabilities 1,616,503,809 $ 1,422,044,475 $ 1,350,789,946  
Currency risk | Argentina        
Exchange Rate Risk        
Total Equity 145,395,883      
Total assets 215,017,770      
Total liabilities $ 69,621,887      
Percentage of entity's revenue 19.90%      
Appreciation (devaluation) of foreign currency against the domestic currency 32.40%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (239,096)      
Increase (decrease) in liabilities due to a reasonably possible risk increase (5,148,794)      
Currency risk | Brazil        
Exchange Rate Risk        
Total Equity 231,787,304      
Total assets 793,157,414      
Total liabilities $ 561,370,108      
Percentage of entity's revenue 29.90%      
Appreciation (devaluation) of foreign currency against the domestic currency 26.40%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (2,506,240)      
Increase (decrease) in equity due to a reasonably possible risk increase (11,495,651)      
Currency risk | Paraguay        
Exchange Rate Risk        
Total Equity 232,163,091      
Total assets 270,899,700      
Total liabilities $ 38,736,609      
Percentage of entity's revenue 7.90%      
Appreciation (devaluation) of foreign currency against the domestic currency 11.20%      
Percentage of reasonably possible risk increase (5.00%)      
Increase (decrease) in income due to a reasonably possible increase in risk component $ (1,737,265)      
Increase (decrease) in equity due to a reasonably possible risk increase $ (10,462,776)