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Provisions - Foreign Office Guarantees and Standby Letters of Credit - Outstanding Exposures (Details) - Foreign office guarantees and standby letters of credit [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Exposure as at beginning of period $ 341,676 $ 285,035
Net change on exposures (39,384) 29,677
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (21,454) 26,964
Exposure as at ending of period 280,838 341,676
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 332,965 274,563
Net change on exposures (47,268) 33,660
Transfer to Stage 1 5,243 4,994
Transfer to Stage 2 (22,454) (6,513)
Transfer to Stage 3
Foreign exchange adjustments (19,180) 26,261
Exposure as at ending of period 249,306 332,965
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 138 84
Net change on exposures 273 24
Transfer to Stage 1 7
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (23) 30
Exposure as at ending of period 395 138
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 8,573 10,388
Net change on exposures 7,604 (4,139)
Transfer to Stage 1 (5,243) (4,855)
Transfer to Stage 2 22,454 6,513
Transfer to Stage 3
Foreign exchange adjustments (2,251) 666
Exposure as at ending of period 31,137 8,573
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 7
Transfer to Stage 1 (7)
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 132
Transfer to Stage 1 (139)
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments 7
Exposure as at ending of period
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period