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RISK MANAGEMENT (Details 18) - Liquidity Risk [Member] - CLP ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Obligations under repurchase agreements [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | $ 48,545 | $ 268,061
Obligations under repurchase agreements [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 48,545 | 268,061
Obligations under repurchase agreements [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 48,545 | 268,061
Obligations under repurchase agreements [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Obligations under repurchase agreements [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Checking Accounts, Time Deposits & Other Time Liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 21,972,279 | 20,168,837
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,027,434 | 8,376,371
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 5,248,418 | 5,120,171
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 3,326,199 | 2,299,018
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,108,556 | 4,201,271
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 21,710,607 | 19,996,831
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 191,547 | 106,833
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 6,137 | 2,811
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 63,988 | 62,362
Checking Accounts, Time Deposits & Other Time Liabilities [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 261,672 | 172,006
Financial Derivatives Contracts [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 2,517,728 | 2,139,488
Financial Derivatives Contracts [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Financial Derivatives Contracts [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 131,378 | 144,410
Financial Derivatives Contracts [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 349,551 | 356,288
Financial Derivatives Contracts [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 120,361 | 196,444
Financial Derivatives Contracts [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 601,290 | 697,142
Financial Derivatives Contracts [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 495,789 | 378,582
Financial Derivatives Contracts [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 471,185 | 358,358
Financial Derivatives Contracts [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 949,464 | 705,406
Financial Derivatives Contracts [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,916,438 | 1,442,346
Interbank Borrowings [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,788,626 | 1,698,357
Interbank Borrowings [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 39,378 | 4,130
Interbank Borrowings [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 16,310 | 46,013
Interbank Borrowings [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,188,692 | 1,030,241
Interbank Borrowings [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 404,575 | 397,419
Interbank Borrowings [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,648,955 | 1,477,803
Interbank Borrowings [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 139,671 | 220,554
Interbank Borrowings [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Interbank Borrowings [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Interbank Borrowings [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 139,671 | 220,554
Issue debt instruments [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 8,115,233 | 7,093,653
Issue debt instruments [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities |  |
Issue debt instruments [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 71,465 | 21,043
Issue debt instruments [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 745,830 | 274,239
Issue debt instruments [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 39,267 | 55,119
Issue debt instruments [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 856,562 | 350,401
Issue debt instruments [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 2,431,849 | 1,727,571
Issue debt instruments [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,549,743 | 2,104,771
Issue debt instruments [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 3,277,079 | 2,910,910
Issue debt instruments [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 7,258,671 | 6,743,252
Other financial liabilities [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 215,400 | 242,030
Other financial liabilities [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 179,681 | 177,663
Other financial liabilities [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 934 | 701
Other financial liabilities [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 22,844 | 31,879
Other financial liabilities [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 2,412 | 2,583
Other financial liabilities [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 205,871 | 212,826
Other financial liabilities [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,261 | 27,581
Other financial liabilities [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 92 | 404
Other financial liabilities [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 176 | 1,219
Other financial liabilities [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,529 | 29,204
Total Financial Liabilities Before Interest Payment [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 34,657,811 | 31,610,426
Total Financial Liabilities Before Interest Payment [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,246,493 | 8,558,164
Total Financial Liabilities Before Interest Payment [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 5,517,050 | 5,600,399
Total Financial Liabilities Before Interest Payment [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 5,633,116 | 3,991,665
Total Financial Liabilities Before Interest Payment [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,675,171 | 4,852,836
Total Financial Liabilities Before Interest Payment [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 25,071,830 | 23,003,064
Total Financial Liabilities Before Interest Payment [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 3,268,117 | 2,461,121
Total Financial Liabilities Before Interest Payment [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 2,027,157 | 2,466,344
Total Financial Liabilities Before Interest Payment [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,290,707 | 3,679,897
Total Financial Liabilities Before Interest Payment [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,585,981 | 8,607,362
Contractual Interest Payments [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,863,456 | 3,363,077
Contractual Interest Payments [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,918 | 4,403
Contractual Interest Payments [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 82,292 | 45,465
Contractual Interest Payments [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 812,920 | 462,579
Contractual Interest Payments [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 158,760 | 117,779
Contractual Interest Payments [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,058,890 | 630,226
Contractual Interest Payments [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,156,262 | 808,502
Contractual Interest Payments [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,110,918 | 776,796
Contractual Interest Payments [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 1,537,385 | 1,147,553
Contractual Interest Payments [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 3,804,565 | 2,732,851
Total Financial Liabilities After Interest Payment [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 39,521,267 | 34,973,503
Total Financial Liabilities After Interest Payment [Member] | Demand [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 9,251,411 | 8,562,567
Total Financial Liabilities After Interest Payment [Member] | Not Later Than One Month [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 5,599,342 | 5,645,864
Total Financial Liabilities After Interest Payment [Member] | More Than 3 Months To 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 6,446,036 | 4,454,244
Total Financial Liabilities After Interest Payment [Member] | Later Than One Month And Not Later Than Three Months [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,833,931 | 4,970,615
Total Financial Liabilities After Interest Payment [Member] | Due Within 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 26,130,720 | 23,633,290
Total Financial Liabilities After Interest Payment [Member] | Between 1 and 3 years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 4,424,379 | 3,269,623
Total Financial Liabilities After Interest Payment [Member] | Later than three years and not later than five years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 3,138,075 | 3,243,140
Total Financial Liabilities After Interest Payment [Member] | Due After 5 Years [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | 5,828,092 | 4,827,450
Total Financial Liabilities After Interest Payment [Member] | More Than 1 Year [Member] |  |
Disclosure of financial liabilities [line items] |  |
Financial Liabilities | $ 13,390,546 | $ 11,340,213

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