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REPORTING SEGMENTS (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost $ 26,772,544  
Net interest income 1,414,368 1,326,691 $ 1,281,366
Net fee and commission income 484,463 455,558 431,184
Expected credit losses 317,408 302,255 342,083
Other operating income 23,129 62,016 6,427
Income from investments in associates and other companies 5,095 3,963 3,012
Income tax expense 167,144 145,031 109,031
Net income for the year 599,693 575,249 478,432
Retail Banking [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 20,786,637 [1] 19,233,169 [2] 18,604,936 [2]
Net interest income 949,764 970,332 931,105
Net fee and commission income 220,532 206,449 196,845
Financial transactions, net [3] 19,694 20,595 21,141
Expected credit losses (287,739) (293,956) (323,888)
Support expenses [4] (553,157) (534,970) (529,909)
Segment`s net contribution 349,094 368,450 295,294
Middle Market [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 7,690,380 [1] 6,775,734 [2] 6,396,376 [2]
Net interest income 272,912 264,663 244,960
Net fee and commission income 36,746 36,280 30,851
Financial transactions, net [3] 16,848 13,751 19,577
Expected credit losses (26,314) (19,235) (26,748)
Support expenses [4] (92,377) (91,882) (83,412)
Segment`s net contribution 207,815 203,577 185,228
Commercial Banking [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 28,477,017 [1] 26,008,903 [2] 25,001,312 [2]
Net interest income 1,222,676 1,234,995 1,176,065
Net fee and commission income 257,278 242,729 227,696
Financial transactions, net [3] 36,542 34,346 40,718
Expected credit losses (314,053) (313,191) (350,636)
Support expenses [4] (645,534) (626,852) (613,321)
Segment`s net contribution 556,909 572,027 480,522
Global Corporate Banking [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 1,613,088 [1] 1,633,796 [2] 2,121,513 [2]
Net interest income 96,722 100,808 95,105
Net fee and commission income 35,064 27,626 25,077
Financial transactions, net [3] 57,340 50,714 55,927
Expected credit losses 2,339 6,440 7,579
Support expenses [4] (64,913) (62,685) (53,935)
Segment`s net contribution 126,552 122,903 129,753
Other [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 123,309 [1] 83,215 [2] 83,606 [2]
Net interest income 94,970 (9,112) 10,196
Net fee and commission income (1,457) 8,708 1,651
Financial transactions, net [3] 11,200 44,692 43,713
Expected credit losses (5,694) 4,496 974
Support expenses [4] (11,486) (15,356) (19,649)
Segment`s net contribution 87,533 33,428 36,885
Total [Member]      
Disclosure of operating segments [line items]      
Loans and accounts receivable at amortised cost 30,213,414 [1] 27,725,914 [2] 27,206,431 [2]
Net interest income 1,414,368 1,326,691 1,281,366
Net fee and commission income 290,885 279,063 254,424
Financial transactions, net [3] 105,082 129,752 140,358
Expected credit losses (317,408) (302,255) (342,083)
Support expenses [4] (721,933) (704,893) (686,905)
Segment`s net contribution 770,994 728,358 647,160
Other operating income 23,129 62,016 6,427
Other operating expenses and impairment (32,381) (74,057) (69,136)
Income from investments in associates and other companies 5,095 3,963 3,012
Income tax expense (167,144) (145,031) (109,031)
Net income for the year $ 599,693 $ 575,249 $ 478,432
[1] Corresponds to loans and accounts receivable at amortised cost under IFRS 9, without deducting their allowances for loan losses.
[2] Corresponds to loans and accounts receivable from customers, without deducting their allowances for loan losses.
[3] Corresponds to the sum of the net income from financial operations and the foreign exchange profit or loss.
[4] Corresponds to the sum of personnel salaries and expenses, administrative expenses, depreciation and amortization.