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Provisions - Changes in Provisions (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Changes in provisions      
Beginning Balance   $ 194,537 $ 187,568
Provisions established   180,506 172,804
Provisions used   (192,151) (165,675)
Provisions released   (1,921) (160)
Ending Balance $ 294,040 203,946 194,537
Impairment of losses      
Foreign office guarantees and standby letters of credit   341,676 285,035
Confirmed foreign letters of credit   56,764 64,970
Issued foreign letters of credit   388,396 94,313
Performance guarantees   2,232,682 2,220,828
Undrawn credit lines   7,769,325 7,240,406
Total   31,840,465 31,004,741
Minimum dividends      
Changes in provisions      
Beginning Balance   172,804 165,675
Provisions established   178,462 172,804
Provisions used   (172,804) (165,675)
Ending Balance   178,462 172,804
Provisions for contingent loan risks      
Changes in provisions      
Provisions established   2,041  
Ending Balance   25,016  
Impairment of losses      
Foreign office guarantees and standby letters of credit   428  
Confirmed foreign letters of credit   29  
Issued foreign letters of credit   93  
Performance guarantees   4,080  
Undrawn credit lines   20,386  
Total   25,016  
Contingencies      
Changes in provisions      
Beginning Balance   21,733 21,893
Provisions established   3  
Provisions used   (19,347)  
Provisions released   (1,921) (160)
Ending Balance   $ 468 $ 21,733