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ADMINISTRATIVE EXPENSES (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
General administrative expenses      
Maintenance and repair of property, plant and equipment $ 20,962 $ 21,359 $ 19,901
Office lease 29,761 26,136 28,098
Equipment lease 55 96 280
Insurance payments 3,439 3,354 3,842
Office supplies 5,070 6,862 5,747
IT and communication expenses 44,209 39,103 37,351
Heating, and other utilities 4,849 5,468 4,863
Security and valuables transport services 12,168 12,181 14,793
Representation and personnel travel expenses 3,444 4,262 5,440
Judicial and notarial expenses 1,148 974 952
Fees for technical reports and auditing 10,020 9,379 7,631
Other general administrative expenses 10,116 10,244 10,076
General administrative expenses 145,241 139,418 138,974
Outsourced services      
Data processing 32,360 34,880 36,068
Products sale
Archive services 3,401 3,324 4,427
Valuation services 3,167 2,419 3,489
Outsourcing 9,936 6,878 5,404
Other 16,494 9,899 6,369
Outsourced services 65,358 57,400 55,757
Board expenses 1,297 1,290 1,371
Marketing expenses 19,286 18,877 17,844
Taxes, payroll taxes, and contributions      
Real estate taxes 1,730 1,443 1,435
Patents 1,896 1,646 1,618
Other taxes 7 24 93
Contributions to SBIF 10,274 10,005 9,321
Taxes, payroll taxes, and contributions 13,907 13,118 12,467
Total $ 245,089 $ 230,103 $ 226,413