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Loans and Advances to Banks, net - Impairment allowance for due from banks (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with domestic banks     $ 99,776 $ 119,998
Loans and advances with foreign banks     293,777 289,107
Loans and advances with central bank of Chile     1,100,831 350,916
Loans and advances to banks   $ 2,154,533 1,494,384 760,021
Financial assets at beginning of period $ 4,390,903      
Financial assets at end of period 4,312,504      
Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances to banks     1,495,396 760,285
Loans and advances to banks, net | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with domestic banks     100,023 120,017
Loans and advances with foreign banks     294,542 289,352
Loans and advances with central bank of Chile     1,100,831 350,916
Loans and advances to banks     1,495,396 760,285
Financial assets at beginning of period 760,285      
Net change on financial assets 748,184      
Foreign exchange adjustments (13,073)      
Financial assets at end of period 1,495,396      
Loans and advances to banks, net | Accumulated Amortization        
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 (772)      
Net change on financial assets (259)      
Impact on year end ECL of exposures transferred between stages during the year (3)      
Foreign exchange adjustments 22      
Financial assets at end of period (1,012)      
Loans and advances to banks, net | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with domestic banks     100,023  
Loans and advances with foreign banks     266,648  
Loans and advances with central bank of Chile     1,100,831  
Loans and advances to banks     1,467,502  
Financial assets at beginning of period 760,285      
Net change on financial assets 746,808      
Transfer to Stage 2 (26,518)      
Foreign exchange adjustments (13,073)      
Financial assets at end of period 1,467,502      
Loans and advances to banks, net | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Accumulated Amortization        
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 (772)      
Net change on financial assets (250)      
Transfer to Stage 2 63      
Foreign exchange adjustments 22      
Financial assets at end of period (937)      
Loans and advances to banks, net | Lifetime expected credit losses | Individual | Financial instruments not credit-impaired | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with foreign banks     27,894  
Loans and advances to banks     27,894  
Net change on financial assets 1,376      
Transfer to Stage 2 26,518      
Financial assets at end of period 27,894      
Loans and advances to banks, net | Lifetime expected credit losses | Individual | Financial instruments not credit-impaired | Accumulated Amortization        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Net change on financial assets (9)      
Transfer to Stage 2 (63)      
Impact on year end ECL of exposures transferred between stages during the year (3)      
Financial assets at end of period $ (75)      
Loans and advances to banks, net | Normal | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with domestic banks     100,023 120,017
Loans and advances with foreign banks     294,542 289,352
Loans and advances with central bank of Chile     1,100,831 $ 350,916
Loans and advances to banks, net | Normal | 12-month expected credit losses | Individual | Financial instruments not credit-impaired | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with domestic banks     100,023  
Loans and advances with foreign banks     266,648  
Loans and advances with central bank of Chile     1,100,831  
Loans and advances to banks, net | Normal | Lifetime expected credit losses | Individual | Financial instruments not credit-impaired | Gross Balance        
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]        
Loans and advances with foreign banks     $ 27,894