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Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances - Warranty by Endorsement and Sureties [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 as at beginning of period $ 280,838 $ 341,676
Net change on exposures (51,090) (39,384)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3  
Foreign exchange adjustments (5,669) (21,454)
Exposure as at ending of period 224,079 280,838
ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 63 428
Net change on exposures 2,819 (348)
Transfer to Stage 1
Transfer to Stage 2
Impact on year-end ECL of exposures transferred between stages during the year 2,974 (1)
Changes to models and assumptions 393 (25)
Transfer to Stage 3  
Foreign exchange adjustments (181) 9
Exposure as at ending of period 6,068 63
Stage 1 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 249,306 332,965
Net change on exposures (31,759) (47,268)
Transfer to Stage 1 29,099 5,243
Transfer to Stage 2 (55,270) (22,454)
Transfer to Stage 3  
Foreign exchange adjustments (5,325) (19,180)
Exposure as at ending of period 186,051 249,306
Stage 1 - Individual [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 41 428
Net change on exposures (19) (366)
Transfer to Stage 1 1 8
Transfer to Stage 2 (18) (6)
Impact on year-end ECL of exposures transferred between stages during the year (1)
Changes to models and assumptions 167 (32)
Transfer to Stage 3  
Foreign exchange adjustments 2 10
Exposure as at ending of period 174 41
Stage 1 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 395 138
Net change on exposures (231) 273
Transfer to Stage 1 7
Transfer to Stage 2 (65)
Transfer to Stage 3  
Foreign exchange adjustments 32 (23)
Exposure as at ending of period 131 395
Stage 1 - Group [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions
Transfer to Stage 3  
Foreign exchange adjustments
Exposure as at ending of period
Stage 2 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 31,137 8,573
Net change on exposures (19,038) 7,604
Transfer to Stage 1 (29,099) (5,243)
Transfer to Stage 2 55,270 22,454
Transfer to Stage 3 (6,069)  
Foreign exchange adjustments 66 (2,251)
Exposure as at ending of period 32,267 31,137
Stage 2 - Individual [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period 22
Net change on exposures 2,838 18
Transfer to Stage 1 (1) (8)
Transfer to Stage 2 18 6
Impact on year-end ECL of exposures transferred between stages during the year 159
Changes to models and assumptions 226 7
Transfer to Stage 3 (3,034)  
Foreign exchange adjustments 36 (1)
Exposure as at ending of period 264 22
Stage 2 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures (62) 7
Transfer to Stage 1 (7)
Transfer to Stage 2 65
Transfer to Stage 3  
Foreign exchange adjustments (3)
Exposure as at ending of period
Stage 2 - Group [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions
Transfer to Stage 3  
Foreign exchange adjustments
Exposure as at ending of period
Stage 3 - Individual [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3 6,069  
Foreign exchange adjustments (439)
Exposure as at ending of period 5,630
Stage 3 - Individual [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Impact on year-end ECL of exposures transferred between stages during the year 2,815
Changes to models and assumptions
Transfer to Stage 3 3,034  
Foreign exchange adjustments (219)
Exposure as at ending of period 5,630
Stage 3 - Group [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [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
Stage 3 - Group [Member] | ECL Exposures On Foreign Office Guarantees [Member]    
Provisions (Details) - Schedule of change in gross carrying amount and ECL allowances [Line Items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions
Transfer to Stage 3  
Foreign exchange adjustments
Exposure as at ending of period