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RISK MANAGEMENT (Details 18) - Liquidity Risk [Member] - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
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