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FINANCIAL RISK MANAGEMENT - Interest Rate Risk (Details) - 12 months ended Dec. 31, 2017 - Interest rate risk
$ in Thousands, in Thousands, $ in Millions
CLF ( )
CLP ($)
USD ($)
Interest Rate Risk      
Insurance net balances   $ 220,693  
Fixed interest rate | Domestic      
Interest Rate Risk      
Financial liabilities | 11,580    
Fixed interest rate | Foreign      
Interest Rate Risk      
Financial liabilities     $ 575
Percentage of foreign bonds re-denominated to domestic currencies 100.00%