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Loans to Customers, net - Allowance for loan losses (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Allowances for loan losses        
Balance as of beginning of period   $ (24,843,655) $ (24,022,983)  
Balance as of end of period $ (40,550,009) (24,955,692) (24,843,655) $ (24,022,983)
Commercial loans        
Allowances for loan losses        
Balance as of beginning of period   (14,226,761) (14,101,661)  
Balance as of end of period   (13,739,589) (14,226,761) (14,101,661)
Residential mortgage loans        
Allowances for loan losses        
Balance as of beginning of period   (6,892,019) (6,374,981)  
Balance as of end of period   (7,445,221) (6,892,019) (6,374,981)
Consumer loans        
Allowances for loan losses        
Balance as of beginning of period   (3,724,875) (3,546,341)  
Balance as of end of period   (3,770,882) (3,724,875) (3,546,341)
Accumulated Amortization and Impairment        
Allowances for loan losses        
Balance as of beginning of period   554,769 550,443  
Balance as of end of period   495,821 554,769 550,443
Accumulated Amortization and Impairment | Total provision        
Allowances for loan losses        
Balance as of beginning of period   554,769 550,443 490,558
Charge-offs   (318,790) (277,057) (256,556)
Sales or transfer of credits   (11,595) (24,925) (2,690)
Loan portfolio acquisition       12,329
Allowances (released) established, net   271,437 306,308 306,802
Balance as of end of period   495,821 554,769 550,443
Accumulated Amortization and Impairment | Individual Provision        
Allowances for loan losses        
Balance as of beginning of period   164,662 212,424  
Balance as of end of period   110,722 164,662 212,424
Accumulated Amortization and Impairment | Group Provision        
Allowances for loan losses        
Balance as of beginning of period   390,107 338,019  
Balance as of end of period   385,099 390,107 338,019
Accumulated Amortization and Impairment | Commercial loans        
Allowances for loan losses        
Balance as of beginning of period   272,274 319,504  
Balance as of end of period   221,229 272,274 319,504
Accumulated Amortization and Impairment | Commercial loans | Individual Provision        
Allowances for loan losses        
Balance as of beginning of period   164,662 212,424 162,067
Charge-offs   (13,774) (14,913) (13,228)
Sales or transfer of credits   (11,595) (24,925) (2,690)
Loan portfolio acquisition       12,329
Allowances (released) established, net   (28,571) (7,924) 53,946
Balance as of end of period   110,722 164,662 212,424
Accumulated Amortization and Impairment | Commercial loans | Group Provision        
Allowances for loan losses        
Balance as of beginning of period   107,612 107,080 111,746
Charge-offs   (44,942) (44,930) (44,760)
Allowances (released) established, net   47,837 45,462 40,094
Balance as of end of period   110,507 107,612 107,080
Accumulated Amortization and Impairment | Residential mortgage loans        
Allowances for loan losses        
Balance as of beginning of period   32,747 30,005  
Balance as of end of period   32,015 32,747 30,005
Accumulated Amortization and Impairment | Residential mortgage loans | Group Provision        
Allowances for loan losses        
Balance as of beginning of period   32,747 30,005 24,021
Charge-offs   (5,093) (4,190) (2,553)
Allowances (released) established, net   4,361 6,932 8,537
Balance as of end of period   32,015 32,747 30,005
Accumulated Amortization and Impairment | Consumer loans        
Allowances for loan losses        
Balance as of beginning of period   249,748 200,934  
Balance as of end of period   242,577 249,748 200,934
Accumulated Amortization and Impairment | Consumer loans | Group Provision        
Allowances for loan losses        
Balance as of beginning of period   249,748 200,934 192,724
Charge-offs   (254,981) (213,024) (196,015)
Allowances (released) established, net   247,810 261,838 204,225
Balance as of end of period   $ 242,577 $ 249,748 $ 200,934