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Note Goodwill and other intangible assets (Gross amount of goodwill and accumulated impairment losses by reportable segment and corporate group) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill Gross | $ 855,748 | $ 795,506 | $ 795,506
Goodwill Impaired Accumulated Impairment Loss | 168,212 | 168,212 | 168,212
Goodwill (net amounts) | 687,536 | 627,294 | 627,294
Banco Popular de Puerto Rico |  |  |
Goodwill [Line Items] |  |  |
Goodwill Gross | 340,463 | 280,221 | 280,221
Goodwill Impaired Accumulated Impairment Loss | 3,801 | 3,801 | 3,801
Goodwill (net amounts) | 336,662 | 276,420 | 276,420
Popular U.S. |  |  |
Goodwill [Line Items] |  |  |
Goodwill Gross | 515,285 | 515,285 | 515,285
Goodwill Impaired Accumulated Impairment Loss | 164,411 | 164,411 | 164,411
Goodwill (net amounts) | $ 350,874 | $ 350,874 | $ 350,874

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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