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Derivative instruments and hedging activities - Derivative instruments and hedging activities- Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instrument Detail [Abstract]
Fair Value Hedges At Fair Value Net	$ 0	$ 0
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net	(1,244,000)	1,273,000	$ (923,000)
Derivative Liabilities Credit Risk Gain Losses	$ 200,000	$ (600,000)	200,000
Derivative Assets Credit Risk Gain Losses			$ (100,000)
Derivative remaining maturity days	83 days

X

- Definition

This item represents the estimated gains or losses included in earnings attributable to the impact of changes in credit risk on derivative assets.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the estimated gains or losses included in earnings attributable to the impact of changes in credit risk on derivative liabilities.

+ References

No definition available.

+ Details

Name:	bpop_DerivativeLiabilitiesCreditRiskGainLosses
Namespace Prefix:	bpop_
Data Type:	xbrli:monetaryItemType
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- References

No definition available.

+ Details

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X

- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeRemainingMaturity1
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- Definition

Net fair value of all derivative instruments designated as fair value hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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- Definition

Aggregate net gain and losses (whether realized or unrealized) on all derivative instruments held for trading purposes whether or not settled physically.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4F
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624186-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41322-113958

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