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Income and Expenses from Fees and Commissions (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Income from fees and commissions        
Card services   $ 155,572 $ 144,007 $ 129,962
Investments in mutual funds and other   86,103 79,853 76,843
Collections and payments   50,343 49,362 52,657
Portfolio management   43,915 39,838 37,540
Insurance brokerage   30,163 28,036 23,258
Guarantees and letter of credit   24,485 23,183 21,858
Trading and securities management   18,741 13,666 14,701
Use of distribution channel   18,204 18,996 20,679
Financial advisory services   5,536 4,152 12,608
Lines of credit and overdrafts   5,000 5,795 13,400
Other fees earned   33,640 34,155 32,570
Total income from fees and commissions $ 766,459 471,702 441,043 436,076
Expenses from fees and commissions        
Credit card transactions   (96,872) (98,115) (100,231)
Fees for interbank transactions   (13,189) (10,361) (14,322)
Fees for securities transactions   (6,802) (3,969) (3,139)
Fees for collections and payments   (6,206) (6,427) (6,568)
Sales force fees   (213) (408) (1,343)
Other fees   (746) (492) (4,494)
Total expenses from fees and commissions $ (201,530) $ (124,028) $ (119,772) $ (130,097)