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Loans and Advance to Banks - Provisions for loans to banks (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($)
Reconciliation of provision for loans to banks |  |  |
Balance at beginning of period |  | $ (1,173,187) |
Balance at end of period | $ (1,234,943) | (760,021) | $ (1,173,187)
Accumulated Amortization and Impairment |  |  |
Reconciliation of provision for loans to banks |  |  |
Balance at beginning of period |  | 259 | 353
Provisions established (released), net |  | 5 | (94)
Balance at end of period |  | 264 | 259
Accumulated Amortization and Impairment | Domestic banks |  |  |
Reconciliation of provision for loans to banks |  |  |
Balance at beginning of period |  | 49 | 36
Provisions established (released), net |  | (30) | 13
Balance at end of period |  | 19 | 49
Accumulated Amortization and Impairment | Foreign banks |  |  |
Reconciliation of provision for loans to banks |  |  |
Balance at beginning of period |  | 210 | 317
Provisions established (released), net |  | 35 | (107)
Balance at end of period |  | $ 245 | $ 210

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- Definition Amount of provision doe loans to banks established (released) during the period by the entity. + References No definition available. + Details
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- Definition The amount of loans and advances the entity has made to banks. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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