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ACCOUNTING CHANGES (Details)
$ in Millions
Jan. 02, 2018
CLP ($)
Disclosure of financial assets [line items]  
Assets before allowances $ 27,617,680
ECL allowance 888,091
Net Assets 26,566,917
Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 24,570,691
ECL allowance 167,125
Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,565,462
ECL allowance 126,107
Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,481,527
ECL allowance 594,859
Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 13,963,093
ECL allowance 482,713
Net Assets 13,317,708
Commercial Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 12,401,069
ECL allowance 79,811
Commercial Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 838,533
ECL allowance 51,323
Commercial Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 723,491
ECL allowance 351,579
Commercial Loans [Member] | Interbank Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 162,685
ECL allowance 13
Net Assets 162,672
Commercial Loans [Member] | Interbank Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 162,685
ECL allowance 13
Commercial Loans [Member] | Interbank Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances
ECL allowance
Commercial Loans [Member] | Interbank Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances
ECL allowance
Commercial Loans [Member] | Commercial Loans Portfolio [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 9,882,422
ECL allowance 339,957
Net Assets 9,542,465
Commercial Loans [Member] | Commercial Loans Portfolio [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 8,743,179
ECL allowance 56,546
Commercial Loans [Member] | Commercial Loans Portfolio [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 595,436
ECL allowance 36,541
Commercial Loans [Member] | Commercial Loans Portfolio [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 543,807
ECL allowance 246,870
Commercial Loans [Member] | Foreign Trade Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,574,513
ECL allowance 39,212
Net Assets 1,535,301
Commercial Loans [Member] | Foreign Trade Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,464,059
ECL allowance 4,883
Commercial Loans [Member] | Foreign Trade Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 56,110
ECL allowance 849
Commercial Loans [Member] | Foreign Trade Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 54,344
ECL allowance 33,480
Commercial Loans [Member] | Checking Accounts Debtors [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 195,696
ECL allowance 12,098
Net Assets 183,598
Commercial Loans [Member] | Checking Accounts Debtors [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 173,738
ECL allowance 2,302
Commercial Loans [Member] | Checking Accounts Debtors [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 8,005
ECL allowance 411
Commercial Loans [Member] | Checking Accounts Debtors [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 13,953
ECL allowance 9,385
Commercial Loans [Member] | Factoring Transactions [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 449,890
ECL allowance 4,294
Net Assets 445,596
Commercial Loans [Member] | Factoring Transactions [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 441,014
ECL allowance 837
Commercial Loans [Member] | Factoring Transactions [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,035
ECL allowance 91
Commercial Loans [Member] | Factoring Transactions [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,841
ECL allowance 3,366
Commercial Loans [Member] | Student Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 88,290
ECL allowance 12,065
Net Assets 76,225
Commercial Loans [Member] | Student Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 70,984
ECL allowance 3,644
Commercial Loans [Member] | Student Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 7,402
ECL allowance 2,329
Commercial Loans [Member] | Student Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 9,904
ECL allowance 6,092
Commercial Loans [Member] | Leasing Transactions [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,457,004
ECL allowance 46,334
Net Assets 1,410,670
Commercial Loans [Member] | Leasing Transactions [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,235,103
ECL allowance 8,946
Commercial Loans [Member] | Leasing Transactions [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 161,882
ECL allowance 9,553
Commercial Loans [Member] | Leasing Transactions [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 60,019
ECL allowance 27,835
Commercial Loans [Member] | Other Loans And Account Receivable [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 152,593
ECL allowance 28,740
Net Assets 123,853
Commercial Loans [Member] | Other Loans And Account Receivable [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 110,307
ECL allowance 2,640
Commercial Loans [Member] | Other Loans And Account Receivable [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 5,663
ECL allowance 1,549
Commercial Loans [Member] | Other Loans And Account Receivable [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 36,623
ECL allowance 24,551
Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 9,096,895
ECL allowance 108,019
Net Assets 8,988,876
Mortgage Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 8,191,229
ECL allowance 14,602
Mortgage Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 469,349
ECL allowance 20,227
Mortgage Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 436,317
ECL allowance 73,190
Mortgage Loans [Member] | Loans With Mortgage Finance Bonds [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 24,060
ECL allowance 248
Net Assets 23,812
Mortgage Loans [Member] | Loans With Mortgage Finance Bonds [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 21,529
ECL allowance 25
Mortgage Loans [Member] | Loans With Mortgage Finance Bonds [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,230
ECL allowance 51
Mortgage Loans [Member] | Loans With Mortgage Finance Bonds [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,301
ECL allowance 172
Mortgage Loans [Member] | Endorsable Mortgage Mutual Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 115,078
ECL allowance 871
Net Assets 114,207
Mortgage Loans [Member] | Endorsable Mortgage Mutual Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 107,900
ECL allowance 100
Mortgage Loans [Member] | Endorsable Mortgage Mutual Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 2,973
ECL allowance 143
Mortgage Loans [Member] | Endorsable Mortgage Mutual Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,205
ECL allowance 628
Mortgage Loans [Member] | Other Mortgage Mutual Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 8,957,757
ECL allowance 106,900
Net Assets 8,850,857
Mortgage Loans [Member] | Other Mortgage Mutual Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 8,061,800
ECL allowance 14,477
Mortgage Loans [Member] | Other Mortgage Mutual Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 465,146
ECL allowance 20,033
Mortgage Loans [Member] | Other Mortgage Mutual Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 430,811
ECL allowance 72,390
Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,557,692
ECL allowance 297,359
Net Assets 4,260,333
Consumer Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 3,978,393
ECL allowance 72,712
Consumer Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 257,580
ECL allowance 54,557
Consumer Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 321,719
ECL allowance 170,090
Consumer Loans [Member] | Leasing Transactions [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,715
ECL allowance 1,110
Net Assets 3,605
Consumer Loans [Member] | Leasing Transactions [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,627
ECL allowance 1,013
Consumer Loans [Member] | Leasing Transactions [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 47
ECL allowance 23
Consumer Loans [Member] | Leasing Transactions [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 41
ECL allowance 74
Consumer Loans [Member] | Installment Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 2,910,742
ECL allowance 255,849
Net Assets 2,654,893
Consumer Loans [Member] | Installment Consumer Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 2,378,614
ECL allowance 51,172
Consumer Loans [Member] | Installment Consumer Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 234,044
ECL allowance 46,866
Consumer Loans [Member] | Installment Consumer Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 298,084
ECL allowance 157,811
Consumer Loans [Member] | Credit Card Balances [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,364,980
ECL allowance 40,058
Net Assets 1,324,922
Consumer Loans [Member] | Credit Card Balances [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 1,324,742
ECL allowance 20,443
Consumer Loans [Member] | Credit Card Balances [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 20,916
ECL allowance 7,633
Consumer Loans [Member] | Credit Card Balances [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 19,322
ECL allowance 11,982
Consumer Loans [Member] | Other Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 277,255
ECL allowance 342
Net Assets 276,913
Consumer Loans [Member] | Other Consumer Loans [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 270,410
ECL allowance 84
Consumer Loans [Member] | Other Consumer Loans [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 2,573
ECL allowance 35
Consumer Loans [Member] | Other Consumer Loans [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Assets before allowances 4,272
ECL allowance $ 223