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Loans to Customers, 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 ($)
Jan. 01, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers   $ 39,419,340 $ 27,341,254   $ 24,955,692  
Financial assets at beginning of period $ 4,390,903          
Financial assets at end of period 4,312,504          
Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     (585,378) $ (569,638) (495,821) $ (554,769)
Commercial loans            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     15,209,534   13,739,589  
Commercial loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     (228,864) (221,410) (221,229) (272,274)
Mortgage loans            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     8,017,743   7,445,221  
Mortgage loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     (34,330) (33,777) (32,015) (32,747)
Consumer loans            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     4,113,977   3,770,882  
Consumer loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     (322,184) $ (314,451) (242,577) $ (249,748)
Loans to customers | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     27,926,632   25,451,513  
Loans to customers | 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]            
Loans to customers     9,426,420      
Loans to customers | 12-month expected credit losses | Group | 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]            
Loans to customers     13,109,173      
Loans to customers | Lifetime expected credit losses | Financial instruments 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]            
Loans to customers     615      
Loans to customers | 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]            
Loans to customers     2,134,848      
Loans to customers | Lifetime expected credit losses | Individual | Financial instruments 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]            
Loans to customers     120,564      
Loans to customers | Lifetime expected credit losses | Group | 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]            
Loans to customers     2,429,234      
Loans to customers | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     705,778      
Loans to customers | Commercial loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     15,438,398   13,960,818  
Financial assets at beginning of period (221,410)          
Net change on financial assets (11,488)          
Impact on year end ECL of exposures transferred between stages during the year (43,116)          
Amounts written off (52,419)          
Foreign exchange adjustments (5,269)          
Financial assets at end of period (228,864)          
Loans to customers | Commercial loans | 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]            
Loans to customers     9,426,420      
Financial assets at beginning of period (16,527)          
Net change on financial assets (9,424)          
Transfer to Stage 1 (4,114)          
Transfer to Stage 2 2,600          
Transfer to Stage 3 70          
Impact on year end ECL of exposures transferred between stages during the year 2,702          
Amounts written off (150)          
Foreign exchange adjustments (337)          
Financial assets at end of period (24,880)          
Loans to customers | Commercial loans | 12-month expected credit losses | Group | 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]            
Loans to customers     3,049,264      
Financial assets at beginning of period (16,663)          
Net change on financial assets (12,463)          
Transfer to Stage 1 (14,807)          
Transfer to Stage 2 11,606          
Transfer to Stage 3 1,189          
Impact on year end ECL of exposures transferred between stages during the year 9,589          
Amounts written off (67)          
Foreign exchange adjustments (112)          
Financial assets at end of period (21,594)          
Loans to customers | Commercial loans | Lifetime expected credit losses | Financial instruments 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]            
Loans to customers     615      
Financial assets at beginning of period (6)          
Net change on financial assets (293)          
Financial assets at end of period (299)          
Loans to customers | Commercial loans | 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]            
Loans to customers     2,134,848      
Financial assets at beginning of period (31,252)          
Net change on financial assets 5,045          
Transfer to Stage 1 3,981          
Transfer to Stage 2 (8,805)          
Transfer to Stage 3 4,134          
Impact on year end ECL of exposures transferred between stages during the year (4,512)          
Amounts written off (11)          
Foreign exchange adjustments (945)          
Financial assets at end of period (32,343)          
Loans to customers | Commercial loans | Lifetime expected credit losses | Individual | Financial instruments 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]            
Loans to customers     120,564      
Financial assets at beginning of period (50,014)          
Net change on financial assets 18,715          
Transfer to Stage 1 133          
Transfer to Stage 2 6,205          
Transfer to Stage 3 (4,204)          
Impact on year end ECL of exposures transferred between stages during the year (5,505)          
Amounts written off (5,422)          
Foreign exchange adjustments (3,446)          
Financial assets at end of period (32,694)          
Loans to customers | Commercial loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     460,251      
Financial assets at beginning of period (20,247)          
Net change on financial assets 18,338          
Transfer to Stage 1 6,387          
Transfer to Stage 2 (15,817)          
Transfer to Stage 3 13,572          
Impact on year end ECL of exposures transferred between stages during the year (23,822)          
Amounts written off (468)          
Foreign exchange adjustments (46)          
Financial assets at end of period (21,167)          
Loans to customers | Commercial loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     246,436      
Financial assets at beginning of period (86,701)          
Net change on financial assets (31,406)          
Transfer to Stage 1 8,420          
Transfer to Stage 2 4,211          
Transfer to Stage 3 (14,761)          
Impact on year end ECL of exposures transferred between stages during the year (21,568)          
Amounts written off (46,301)          
Foreign exchange adjustments (383)          
Financial assets at end of period (95,887)          
Loans to customers | Mortgage loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     8,052,073   7,477,236  
Financial assets at beginning of period (33,777)          
Net change on financial assets 4,056          
Impact on year end ECL of exposures transferred between stages during the year (11,602)          
Amounts written off (6,993)          
Financial assets at end of period (34,330)          
Loans to customers | Mortgage loans | 12-month expected credit losses | Group | 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]            
Loans to customers     6,893,619      
Financial assets at beginning of period (740)          
Net change on financial assets (299)          
Transfer to Stage 1 (892)          
Transfer to Stage 2 404          
Impact on year end ECL of exposures transferred between stages during the year 803          
Financial assets at end of period (724)          
Loans to customers | Mortgage loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     993,085      
Financial assets at beginning of period (17,351)          
Net change on financial assets 8,772          
Transfer to Stage 1 758          
Transfer to Stage 2 (2,112)          
Transfer to Stage 3 2,693          
Impact on year end ECL of exposures transferred between stages during the year (9,661)          
Amounts written off (6)          
Financial assets at end of period (16,895)          
Loans to customers | Mortgage loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     165,369      
Financial assets at beginning of period (15,686)          
Net change on financial assets (4,417)          
Transfer to Stage 1 134          
Transfer to Stage 2 1,708          
Transfer to Stage 3 (2,693)          
Impact on year end ECL of exposures transferred between stages during the year (2,744)          
Amounts written off (6,987)          
Financial assets at end of period (16,711)          
Loans to customers | Consumer loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     4,436,161   4,013,459  
Financial assets at beginning of period (314,451)          
Net change on financial assets (68,099)          
Impact on year end ECL of exposures transferred between stages during the year (173,078)          
Amounts written off (233,511)          
Foreign exchange adjustments (67)          
Financial assets at end of period (322,184)          
Loans to customers | Consumer loans | 12-month expected credit losses | Group | 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]            
Loans to customers     3,166,290      
Financial assets at beginning of period (44,078)          
Net change on financial assets (40,305)          
Transfer to Stage 1 (26,682)          
Transfer to Stage 2 44,301          
Transfer to Stage 3 2,024          
Impact on year end ECL of exposures transferred between stages during the year 15,379          
Amounts written off (104)          
Foreign exchange adjustments (16)          
Financial assets at end of period (49,273)          
Loans to customers | Consumer loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     975,898      
Financial assets at beginning of period (115,096)          
Net change on financial assets 91,527          
Transfer to Stage 1 9,604          
Transfer to Stage 2 (68,448)          
Transfer to Stage 3 72,629          
Impact on year end ECL of exposures transferred between stages during the year (101,086)          
Amounts written off (627)          
Foreign exchange adjustments (49)          
Financial assets at end of period (110,292)          
Loans to customers | Consumer loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     293,973      
Financial assets at beginning of period (155,277)          
Net change on financial assets (119,321)          
Transfer to Stage 1 17,078          
Transfer to Stage 2 24,147          
Transfer to Stage 3 (74,653)          
Impact on year end ECL of exposures transferred between stages during the year (87,371)          
Amounts written off (232,780)          
Foreign exchange adjustments (2)          
Financial assets at end of period $ (162,619)          
Loans to customers | Normal | Commercial loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     14,969,565   13,494,128  
Loans to customers | Normal | Commercial loans | 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]            
Loans to customers     9,426,420      
Loans to customers | Normal | Commercial loans | 12-month expected credit losses | Group | 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]            
Loans to customers     3,049,264      
Loans to customers | Normal | Commercial loans | 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]            
Loans to customers     2,039,954      
Loans to customers | Normal | Commercial loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     447,225      
Loans to customers | Normal | Commercial loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     6,702      
Loans to customers | Normal | Mortgage loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     7,887,217   7,316,969  
Loans to customers | Normal | Mortgage loans | 12-month expected credit losses | Group | 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]            
Loans to customers     6,893,619      
Loans to customers | Normal | Mortgage loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     993,085      
Loans to customers | Normal | Mortgage loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     513      
Loans to customers | Normal | Consumer loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     4,166,767   3,760,472  
Loans to customers | Normal | Consumer loans | 12-month expected credit losses | Group | 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]            
Loans to customers     3,166,290      
Loans to customers | Normal | Consumer loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     975,898      
Loans to customers | Normal | Consumer loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     24,579      
Loans to customers | Substandard | Commercial loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     94,894   101,253  
Loans to customers | Substandard | Commercial loans | 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]            
Loans to customers     94,894      
Loans to customers | Non-complying | Commercial loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     373,939   365,437  
Loans to customers | Non-complying | Commercial loans | Lifetime expected credit losses | Financial instruments 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]            
Loans to customers     615      
Loans to customers | Non-complying | Commercial loans | Lifetime expected credit losses | Individual | Financial instruments 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]            
Loans to customers     120,564      
Loans to customers | Non-complying | Commercial loans | Lifetime expected credit losses | Group | 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]            
Loans to customers     13,026      
Loans to customers | Non-complying | Commercial loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     239,734      
Loans to customers | Non-complying | Mortgage loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     164,856   160,267  
Loans to customers | Non-complying | Mortgage loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     164,856      
Loans to customers | Non-complying | Consumer loans | Accumulated Amortization            
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]            
Loans to customers     269,394   $ 252,987  
Loans to customers | Non-complying | Consumer loans | Lifetime expected credit losses | Group | Financial instruments 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]            
Loans to customers     $ 269,394