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Administrative Expenses (Details) - Schedule of administrative expenses $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 CLP ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CLP ($) | Dec. 31, 2018 CLP ($)
General administrative expenses |  |  |  |  |
Information technology and communications |  | $ 99,763 |  | $ 92,264 | $ 79,300
Maintenance and repair of property and equipment |  | 48,218 |  | 50,297 | 36,716
External advisory services and professional services fees |  | 14,650 |  | 21,099 | 16,690
Office supplies |  | 11,094 |  | 9,366 | 8,535
Surveillance and securities transport services |  | 10,787 |  | 11,533 | 11,828
Insurance premiums |  | 8,273 |  | 5,851 | 5,286
External service of financial information |  | 5,912 |  | 5,461 | 4,787
Energy, heating and other utilities |  | 5,556 |  | 5,697 | 5,676
Expenses for short-term leases and low value |  | 4,729 |  | 5,801 |
Postal box, mail, postage and home delivery services |  | 4,218 |  | 5,131 | 6,045
Legal and notary expenses |  | 4,182 |  | 3,996 | 4,398
External service of custody of documentation |  | 3,359 |  | 3,315 | 3,088
Donations |  | 2,818 |  | 2,238 | 1,982
Representation and travel expenses |  | 2,780 |  | 3,657 | 3,763
Other expenses of obligations for lease agreements |  | 2,684 |  | 2,797 |
Office rental and equipment and ATM |  |  |  |  | 34,773
Other general administrative expenses |  | 4,495 |  | 5,227 | 8,591
Subtotal |  | 233,518 |  | 233,730 | 231,458
Outsource services |  |  |  |  |
Credit pre-evaluation |  | 12,241 |  | 19,159 | 21,952
External technological developments expenses |  | 11,371 |  | 9,459 | 9,984
Data processing |  | 9,333 |  | 10,129 | 8,562
Certification and technology testing |  | 6,062 |  | 7,460 | 6,823
Other |  | 2,435 |  | 3,470 | 3,577
Subtotal |  | 41,442 |  | 49,677 | 50,898
Board expenses |  |  |  |  |
Board of Directors Compensation | [1] | 2,795 |  | 2,509 | 2,511
Other Board expenses |  | 30 |  | 194 | 298
Subtotal |  | 2,825 |  | 2,703 | 2,809
Marketing expenses |  |  |  |  |
Advertising |  | 23,561 |  | 27,808 | 31,375
Subtotal |  | 23,561 |  | 27,808 | 31,375
Taxes, payroll taxes and contributions |  |  |  |  |
Contribution to the banking regulator |  | 11,408 |  | 10,285 | 9,548
Real estate contributions |  | 4,054 |  | 2,856 | 2,823
Patents |  | 1,284 |  | 1,209 | 1,243
Other taxes |  | 789 |  | 1,437 | 1,323
Subtotal |  | 17,535 |  | 15,787 | 14,937
Total |  | $ 318,881 | $ 447,929 | $ 329,705 | $ 331,477
[1] | It includes fees paid to members of the Advisory Committee of Banchile Corredores de Seguros Ltda, of Ch$14 million (Ch$13 million in December 2019 and Ch$12 million in December 2018).

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