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Contingencies and Commitments - Guarantees Granted - Banchile Corredores de Bolsa S.A (Details)
$ in Millions
Oct. 30, 2014
CLF ( )
Dec. 31, 2017
CLF ( )
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Financial guarantees          
Contingencies and Commitments          
Shares to secure short-sale transactions in Securities Exchange of the Santiago Stock Exchange       $ 20,249 $ 17,750
Shares to secure short-sale transactions in Securities Exchange of the Electronic Stock Exchange of Chile       29,926 22,473
Fixed income securities to ensure system CCLV, Bolsa de Comercio de Santiago, Bolsa de Valores       3,995 2,992
Shares delivered to ensure equity loan, Chilean Electronic Stock Exchange, Stock exchange       3,864 610
Securities Exchange of the Santiago, Stock Exchange         884
Total       $ 58,034 $ 44,709
Banchile Corredores de Bolsa S.A          
Contingencies and Commitments          
Insurance policy guarantee |   20,000      
Insurance policy coverage     $ 10,000,000    
Guarantee for complying with contracts of SOMA |   10,500      
Cash guarantee to Pershing     $ 122,494.32    
Fine imposed | 50,000        
Banchile Corredores de Bolsa S.A | Bank guarantee no. 358131-4 maturing on January 10, 2018          
Contingencies and Commitments          
Bank guarantees issued |   229,100