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Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances - Outstanding Exposures On Issued Foreign Letters Of Credit [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure $ 316,916 $ 388,396
Net change on exposures 32,926 (62,629)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (6,179) (8,851)
Exposure 343,663 316,916
Stage 1 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure 149,753 344,874
Net change on exposures 53,462 (41,247)
Transfer to Stage 1 136,838 20,794
Transfer to Stage 2 (37,319) (167,024)
Transfer to Stage 3
Foreign exchange adjustments (3,893) (7,644)
Exposure 298,841 149,753
Stage 1 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure 1,308 1,585
Net change on exposures 830 (362)
Transfer to Stage 1 866 491
Transfer to Stage 2 (1,048) (333)
Transfer to Stage 3
Foreign exchange adjustments (75) (73)
Exposure 1,881 1,308
Stage 2 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure 165,538 41,823
Net change on exposures (20,836) (21,391)
Transfer to Stage 1 (136,838) (20,794)
Transfer to Stage 2 37,319 167,024
Transfer to Stage 3
Foreign exchange adjustments (2,242) (1,124)
Exposure 42,941 165,538
Stage 2 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure 317 114
Net change on exposures (530) 371
Transfer to Stage 1 (866) (491)
Transfer to Stage 2 1,048 333
Transfer to Stage 3
Foreign exchange adjustments 31 (10)
Exposure 317
Stage 3 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure
Stage 3 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure