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Note Borrowings (Maximum aggregate balance of federal funds purchased and repurchase agreements) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Maximum aggregate balance outstanding at any month-end	$ 401,606	$ 471,083
Average montly aggregate balance outstanding	$ 330,585	$ 399,422
Weighted average interest rate for the year	2.01%	1.22%
Weighted average interest rate at December 31	2.44%	1.50%

X

- Definition

Reflects the calculation of the average interest rate weighted by the amount of fed funds purchased and assets sold under agreements to reurchase outstanding at that time.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Reflects the calculation of the average interest rate weighted by the amount of fed funds purchased and assets sold under agreements to reurchase outstanding during the year.

+ References

No definition available.

+ Details

Name:	bpop_FedFundAssetsSoldWeightedAverageInterestRateForYear
Namespace Prefix:	bpop_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

For federal funds purchased and assets sold under agreements to repurchase, maximum month-end borrowings during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	bpop_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

For federal funds purchased and assets sold under agreements to repurchase, average borrowings during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	bpop_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

+ Details

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