Fair value measurement - Schedule of Gains and Losses (Realized and Unrealized) Included in Earnings (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total gains (losses) included in earnings	$ 238	$ 1,959	$ 2,880	$ 5,535
Changes in unrealized gains (losses) relating to assets still held at reporting date	2,005	356	1,551	(961)
Location, Statement of Income, Balance [Axis]: us-gaap:ProvisionForLoanLeaseAndOtherLosses
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total gains (losses) included in earnings		0		0
Changes in unrealized gains (losses) relating to assets still held at reporting date		0		0
Location, Statement of Income, Balance [Axis]: us-gaap:TradingGainsLosses
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total gains (losses) included in earnings	6	5	9	11
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	8	19	16
Location, Statement of Income, Balance [Axis]: bpop:MortgageBankingActivities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Total gains (losses) included in earnings	232	1,954	2,871	5,524
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ 2,005	$ 348	$ 1,532	$ (977)

Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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.

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