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INVESTMENTS IN ASSOCIATES AND OTHER COMPANIES (Details 2) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]      
Assets $ 1,024,702 $ 962,537 $ 858,762
Liabilities 900,751 843,284 754,547
Equity 105,202 102,607 91,669
Net income for the year 18,749 16,646 12,546
Centro de Compensacion Automatizado S.A. [Member]      
Disclosure of associates [line items]      
Assets 7,073 6,871 5,508
Liabilities 1,480 2,174 1,523
Equity 4,677 3,989 3,241
Net income for the year 916 708 744
Redbanc S.A. [Member]      
Disclosure of associates [line items]      
Assets 20,825 21,235 19,927
Liabilities 12,469 13,751 13,505
Equity 7,505 6,428 5,307
Net income for the year 851 1,056 1,115
Transbank S.A. [Member]      
Disclosure of associates [line items]      
Assets 904,558 822,487 710,475
Liabilities 835,200 765,683 660,957
Equity 56,888 48,709 44,309
Net income for the year 12,470 8,095 5,209
Sociedad Interbancaria de Deposito de Valores S.A. [Member]      
Disclosure of associates [line items]      
Assets 4,392 3,720 3,204
Liabilities 230 60 103
Equity 3,400 2,858 2,435
Net income for the year 762 802 666
Sociedad Nexus S.A. [Member]      
Disclosure of associates [line items]      
Assets 35 32,669 30,038
Liabilities 18 18,888 19,229
Equity 14 10,354 8,898
Net income for the year 3 3,427 1,911
Servicios de Infraestructura de Mercado OTC S.A. [Member]      
Disclosure of associates [line items]      
Assets 25,273 17,913 29,258
Liabilities 13,313 6,414 18,258
Equity 11,506 10,963 9,906
Net income for the year 454 536 1,094
Administrador Financiero del Transantiago S.A. [Member]      
Disclosure of associates [line items]      
Assets 55,818 51,304 54,253
Liabilities 37,419 35,814 40,345
Equity 15,490 13,907 12,758
Net income for the year 2,909 1,583 1,150
Camara de Compensacion de Alto Valor S.A. [Member]      
Disclosure of associates [line items]      
Assets 6,728 6,338 6,099
Liabilities 622 500 627
Equity 5,722 5,399 4,815
Net income for the year $ 384 $ 439 $ 657