Mortgage banking activities -subnote (Details) - GNMA $ in Millions	3 Months Ended
Sep. 30, 2020 USD ($)
Mortgage banking [Line Items]
Loss for previously advanced interest on delinquent loans	$ (10.5)
Bulk loan repurchase
Mortgage banking [Line Items]
Repurchased loans	$ 687.9

Represents gains/(losses), including interest advances, from the repurchase of unreserved loans without credit recourse.

No definition available.

Name:	bpop_GainLossOnRepurchasedDelinquentLoans
Namespace Prefix:	bpop_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration