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Note Regulatory capital requirements - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Trust Preferred Securities Subject To Phase Out Provision Of Dodd Frank Act | $ 374 | $ 427

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- Definition Amount of trust preferred securities subject to phase out provision of Dodd Frank Act. + References No definition available. + Details
Name: | bpop_TrustPreferredSecuritiesSubjectToPhaseOutProvisionOfDoddFrankAct
Namespace Prefix: | bpop_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration