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Income and Expenses from Fees and Commissions: (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of fee and commission income (expense) [text block] [Abstract]  
Schedule of income and expenses for fees and commissions
   2018   2019   2020 
   MCh$   MCh$   MCh$ 
Income from fees and commissions               
Debit and credit card services   167,201    185,878    156,786 
Investments in mutual funds and others   91,173    101,046    92,514 
Use of distribution channel and access to customers   20,974    65,243    75,074 
Collections and payments   52,717    56,389    54,730 
Portfolio management   46,730    47,816    50,272 
Fees for insurance transactions   32,886    37,035    33,049 
Guarantees and letter of credit   25,021    26,101    27,824 
Trading and securities management   24,632    21,878    22,017 
Brand use agreement   14,840    16,494    19,835 
Lines of credit and overdrafts   4,837    4,716    4,568 
Financial advisory services   5,046    4,393    4,487 
Other fees earned   19,057    22,183    20,990 
Total income from fees and commissions   505,114    589,172    562,146 
                
Expenses from fees and commissions               
Credit card transactions   (113,403)   (97,823)   (79,893)
Interbank transactions   (16,554)   (20,133)   (24,843)
Collections and payments   (6,546)   (6,284)   (4,927)
Securities transactions   (7,544)   (5,943)   (4,411)
Sales force   (258)   (404)   (244)
Other fees   (854)   (1,283)   (1,860)
Total expenses from fees and commissions   (145,159)   (131,870)   (116,178)