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Property and Equipment - Cost (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CLP ($) | Dec. 31, 2016 CLP ($) | Dec. 31, 2015 CLP ($)
Reconciliation of changes in Property and equipment |  |  |  |
Property, plant and equipment at beginning of period |  | $ 219,082 |  |
Impairment loss |  | (166) | $ (274) | $ (204)
Property, plant and equipment at end of period | $ 351,395 | 216,259 | 219,082 |
Charge-off provisions for Property and Equipment |  | 163 | 229 |
Gross Balance |  |  |  |
Reconciliation of changes in Property and equipment |  |  |  |
Property, plant and equipment at beginning of period |  | 532,913 | 508,000 |
Additions |  | 23,224 | 27,819 |
Disposals/write-downs |  | (7,785) | (2,861) |
Accumulated depreciation |  | (332,090) | (313,831) |
Impairment loss |  | (3) | (45) |
Property, plant and equipment after considering accumulated depreciation |  | 216,259 | 219,082 |
Property, plant and equipment at end of period |  |  | 532,913 | 508,000
Gross Balance | Land and Buildings |  |  |  |
Reconciliation of changes in Property and equipment |  |  |  |
Property, plant and equipment at beginning of period |  | 302,187 | 292,166 |
Additions |  | 10,606 | 10,174 |
Disposals/write-downs |  | (1,365) | (138) |
Accumulated depreciation |  | (142,768) | (134,900) |
Impairment loss |  |  | (15) |
Property, plant and equipment after considering accumulated depreciation |  | 168,660 | 167,287 |
Property, plant and equipment at end of period |  |  | 302,187 | 292,166
Gross Balance | Equipment |  |  |  |
Reconciliation of changes in Property and equipment |  |  |  |
Property, plant and equipment at beginning of period |  | 180,322 | 167,874 |
Additions |  | 8,898 | 14,105 |
Disposals/write-downs |  | (4,851) | (1,653) |
Accumulated depreciation |  | (148,006) | (139,277) |
Impairment loss |  |  | (4) |
Property, plant and equipment after considering accumulated depreciation |  | 36,363 | 41,045 |
Property, plant and equipment at end of period |  |  | 180,322 | 167,874
Gross Balance | Other |  |  |  |
Reconciliation of changes in Property and equipment |  |  |  |
Property, plant and equipment at beginning of period |  | 50,404 | 47,960 |
Additions |  | 3,720 | 3,540 |
Disposals/write-downs |  | (1,569) | (1,070) |
Accumulated depreciation |  | (41,316) | (39,654) |
Impairment loss |  | (3) | (26) |
Property, plant and equipment after considering accumulated depreciation |  | $ 11,236 | 10,750 |
Property, plant and equipment at end of period |  |  | $ 50,404 | $ 47,960

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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