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Provisions for Loan Losses (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($)
Provisions established: |  |  |  |
Individual provisions |  | $ (5) | $ (5,944) | $ (57,669)
Group provisions |  | (303,139) | (314,232) | (254,269)
Provisions established net |  | (303,144) | (320,176) | (311,938)
Provisions released: |  |  |  |
Individual provisions |  | 32,412 | 10,593 | 12,767
Group provisions |  |  | 3,478 |
Provisions released net |  | 32,412 | 14,071 | 12,767
Recovery of written-off assets |  | 49,477 | 46,842 | 52,949
Provisions net allowances for credit risk | $ (359,513) | (221,255) | (259,263) | (246,222)
Loans and advance to banks |  |  |  |
Provisions established: |  |  |  |
Individual provisions |  | (5) |  |
Provisions established net |  | (5) |  |
Provisions released: |  |  |  |
Individual provisions |  |  | 94 | 463
Provisions released net |  |  | 94 | 463
Provisions net allowances for credit risk |  | (5) | 94 | 463
Total Loans to customers |  |  |  |
Provisions established: |  |  |  |
Individual provisions |  |  |  | (53,946)
Group provisions |  | (300,008) | (314,232) | (252,856)
Provisions established net |  | (300,008) | (314,232) | (306,802)
Provisions released: |  |  |  |
Individual provisions |  | 28,571 | 7,924 |
Provisions released net |  | 28,571 | 7,924 |
Recovery of written-off assets |  | 49,477 | 46,842 | 52,949
Provisions net allowances for credit risk |  | (221,960) | (259,466) | (253,853)
Commercial loans |  |  |  |
Provisions established: |  |  |  |
Individual provisions |  |  |  | (53,946)
Group provisions |  | (47,837) | (45,462) | (40,094)
Provisions established net |  | (47,837) | (45,462) | (94,040)
Provisions released: |  |  |  |
Individual provisions |  | 28,571 | 7,924 |
Provisions released net |  | 28,571 | 7,924 |
Recovery of written-off assets |  | 13,750 | 13,017 | 18,011
Provisions net allowances for credit risk |  | (5,516) | (24,521) | (76,029)
Residential mortgage loans |  |  |  |
Provisions established: |  |  |  |
Group provisions |  | (4,361) | (6,932) | (8,537)
Provisions established net |  | (4,361) | (6,932) | (8,537)
Provisions released: |  |  |  |
Recovery of written-off assets |  | 3,246 | 2,350 | 1,895
Provisions net allowances for credit risk |  | (1,115) | (4,582) | (6,642)
Consumer loans |  |  |  |
Provisions established: |  |  |  |
Group provisions |  | (247,810) | (261,838) | (204,225)
Provisions established net |  | (247,810) | (261,838) | (204,225)
Provisions released: |  |  |  |
Recovery of written-off assets |  | 32,481 | 31,475 | 33,043
Provisions net allowances for credit risk |  | (215,329) | (230,363) | (171,182)
Financial Guarantees |  |  |  |
Provisions established: |  |  |  |
Individual provisions |  |  | (5,944) | (3,723)
Group provisions |  | (3,131) |  | (1,413)
Provisions established net |  | (3,131) | (5,944) | (5,136)
Provisions released: |  |  |  |
Individual provisions |  | 3,841 | 2,575 | 12,304
Group provisions |  |  | 3,478 |
Provisions released net |  | 3,841 | 6,053 | 12,304
Provisions net allowances for credit risk |  | $ 710 | $ 109 | $ 7,168

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