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Loans and Advances to Banks, Net - Changes in gross carrying amount and corresponding allowance for ECL (Details) - Individual [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period $ 1,012 $ 772
Net change on ECL allowances [1] (880) 259
Transfer to Stage 1  
Transfer to Stage 2  
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2] 3
Amounts written off  
Foreign exchange adjustments (22) (22)
Financial assets at end of period 110 1,012
Stage 1 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period 937 772
Net change on ECL allowances [1] (832) 250
Transfer to Stage 1 26
Transfer to Stage 2 (27) (63)
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2]
Amounts written off  
Foreign exchange adjustments (20) (22)
Financial assets at end of period 84 937
Stage 2 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period 75
Net change on ECL allowances [1] (48) 9
Transfer to Stage 1 (26)
Transfer to Stage 2 27 63
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2] 3
Amounts written off  
Foreign exchange adjustments (2)
Financial assets at end of period 26 75
Stage 3 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period
Net change on ECL allowances [1]
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2]
Amounts written off  
Foreign exchange adjustments
Financial assets at end of period
Gross Carrying Amount [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period 1,495,396 760,285
Net change on ECL allowances [1] (327,712) 748,184
Transfer to Stage 1  
Transfer to Stage 2  
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2]
Amounts written off  
Foreign exchange adjustments (27,493) (13,073)
Financial assets at end of period 1,140,191 1,495,396
Gross Carrying Amount [Member] | Stage 1 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period 1,467,502 760,285
Net change on ECL allowances [1] (321,373) 746,808
Transfer to Stage 1 16,405
Transfer to Stage 2 (126,709) (26,518)
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year [2]
Changes to models and assumptions  
Amounts written off
Foreign exchange adjustments (17,274) (13,073)
Financial assets at end of period 1,018,551 1,467,502
Gross Carrying Amount [Member] | Stage 2 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period 27,894
Net change on ECL allowances [1] (6,339) 1,376
Transfer to Stage 1 (16,405)
Transfer to Stage 2 126,709 26,518
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2]
Amounts written off  
Foreign exchange adjustments (10,219)
Financial assets at end of period 121,640 27,894
Gross Carrying Amount [Member] | Stage 3 [Member]    
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]    
Financial assets at beginning of period
Net change on ECL allowances [1]
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3  
Impact on year-end ECL of exposures transferred between stages during the year [2]
Amounts written off  
Foreign exchange adjustments
Financial assets at end of period
[1] Net change between assets originated and assets repaid, excluding write offs.
[2] Represents the change in the year-end ECLs of exposures that were transferred from one stage to another during the year.