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Cash and cash equivalents (Details 1) - CLP ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash $ 97,228 $ 106,203 $ 12,712  
Overnight deposits 471,054 1,978,738 462,873  
Bank balances 45,389,589 41,519,788 42,370,367  
Time deposits 4,804,224 14,955,778 32,639,373  
Investments in mutual funds 16,586,749 24,772 0  
Securities purchased under resale agreements 102,695,758 75,447,904 117,068,914  
Total 170,044,602 134,033,183 192,554,239 $ 214,774,876
chilean Peso [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 75,623 100,921 10,675  
Overnight deposits 0 0 0  
Bank balances 30,110,816 27,164,330 21,964,295  
Time deposits 4,804,224 14,754,416 32,639,373  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 102,695,758 75,447,904 117,068,914  
Total 137,686,421 117,467,571 171,683,257  
US Dollar [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 16,154 788 39  
Overnight deposits 471,054 1,978,738 462,873  
Bank balances 4,691,411 6,479,095 4,922,732  
Time deposits 0 0 0  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 0 0 0  
Total 5,178,619 8,458,621 5,385,644  
Euro [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 0 0 0  
Overnight deposits 0 0 0  
Bank balances 182,966 786,887 955,840  
Time deposits 0 0 0  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 0 0 0  
Total 182,966 786,887 955,840  
Argentinean Pesos        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 5,451 4,494 1,998  
Overnight deposits 0 0 0  
Bank balances 1,391,103 2,158,115 5,699,756  
Time deposits 0 201,362 0  
Investments in mutual funds 16,586,749 24,772    
Securities purchased under resale agreements 0 0 0  
Total 17,983,303 2,388,743 5,701,754  
Uruguayan Peso [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 0 0 0  
Overnight deposits 0 0 0  
Bank balances 718,348 1,136,783 948,816  
Time deposits 0 0 0  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 0 0 0  
Total 718,348 1,136,783 948,816  
Paraguayan Guarani [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 0 0 0  
Overnight deposits 0 0 0  
Bank balances 7,758,211 3,291,550 7,519,619  
Time deposits 0 0 0  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 0 0 0  
Total 7,758,211 3,291,550 7,519,619  
Others [Member]        
Disclosure of Cash and Cash Equivalents [Line Items]        
Cash 0 0 0  
Overnight deposits 0 0 0  
Bank balances 536,734 503,028 359,309  
Time deposits 0 0 0  
Investments in mutual funds 0 0    
Securities purchased under resale agreements 0 0 0  
Total $ 536,734 $ 503,028 $ 359,309