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Provisions - Provisions for Contingent Loan Risks (Details) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Outstanding exposure    
Disclosure of other provisions [line items]    
Foreign office guarantees and standby letters of credit $ 280,838 $ 341,676
Confirmed foreign letters of credit 94,673 56,764
Issued foreign letters of credit 316,916 388,396
Performance guarantees 2,283,390 2,232,682
Undrawn credit lines 7,870,260 7,769,325
Other commitments 155,163 46,561
Total 11,001,240 10,835,404
ECL    
Disclosure of other provisions [line items]    
Foreign office guarantees and standby letters of credit 63 428
Confirmed foreign letters of credit 4 29
Issued foreign letters of credit 51 93
Performance guarantees 4,037 4,080
Undrawn credit lines 20,816 20,386
Other commitments
Total $ 24,971 $ 25,016