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Contingencies and Commitments - Guarantees Granted - Banchile Corredores de Bolsa S.A (Details)
$ in Millions
Oct. 30, 2014
CLF ( )
Dec. 31, 2018
CLF ( )
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
CLP ($)
shares
Dec. 31, 2017
CLP ($)
Financial guarantees          
Contingencies and Commitments          
Shares to secure short-sale transactions in Securities Exchange of the Santiago Stock Exchange       $ 59,074 $ 20,249
Shares to secure short-sale transactions in Securities Exchange of the Electronic Stock Exchange of Chile       17,223 29,926
Fixed income securities to ensure system CCLV, Santiago Securities Exchange, Stock Exchange       5,976 3,995
Shares delivered to ensure equity loan, Chilean Electronic Stock Exchange, Stock exchange         3,864
Total       $ 82,273 $ 58,034
Banchile Corredores de Bolsa S.A          
Contingencies and Commitments          
Insurance policy guarantee |   20,000      
Number of shares in Santiago Stock Exchange pledged | shares   1,000,000 1,000,000 1,000,000  
Number of shares in Electronic Chilean Stock Exchange pledged | shares   100,000 100,000 100,000  
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. 359886-6 maturing on January 10, 2019          
Contingencies and Commitments          
Bank guarantees issued |   242,000