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Risk Management - Renegotiated Assets (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Renegotiated Assets    
Total renegotiated financial assets $ 569,671 $ 576,064
Percentage of renegotiated portfolio of Banco de Chile on total loans 2.04%  
Redefault rate of renegotiated portfolio for retail segment (as a percent) 34.91%  
Average term of commercial credit renegotiated loans (in months) 56 months  
Amortised costs of financial assets modified during the period $ 912,646  
Net modification loss $ 298,761  
Maximum percentage of provisions on renegotiated loans 65.00%  
Period of default prior to renegotiation (in months) 6 months  
Maximum overdue period for provision of decrease in renegotiated payment behaviour 30 days  
Period for renegotiated payment behaviour 7 months  
Period used to test for impairment of loans 90 days  
Loans to customers    
Renegotiated Assets    
Total renegotiated financial assets $ 569,671 576,064
Commercial loans    
Renegotiated Assets    
Total renegotiated financial assets 192,646 191,314
Mortgage loans    
Renegotiated Assets    
Total renegotiated financial assets 14,463 17,400
Consumer loans    
Renegotiated Assets    
Total renegotiated financial assets 362,562 $ 367,350
Facilities that have cured since modification and are now measured using 12mECLs (Stage 1)    
Renegotiated Assets    
Gross carrying amount, Post modification 14,888  
Corresponding ECL, Post modification 1,356  
Gross carrying amount, Pre-modification 15,113  
Corresponding ECL, Pre-modification 4,988  
Facilities that reverted to (Stage 2/3) lifetime ECLs having once cured    
Renegotiated Assets    
Gross carrying amount, Post modification 1,515  
Corresponding ECL, Post modification 540  
Gross carrying amount, Pre-modification 1,512  
Corresponding ECL, Pre-modification $ 206