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

X

- 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

X

- 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