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Note Transfers of financial assets and servicing assets (Changes in MSRs measured using the fair value method) (Detail) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017
Transfers and Servicing of Financial Assets
Fair value at beginning of period		$ 168,031	$ 196,889
Additions		7,871	7,530
Changes due to payments of loans	[1]	(10,194)	(12,794)
Reduction due to loan repurchases		(2,929)	(1,605)
Changes in fair value due to changes in valuation model inputs or assumptions		0	(9,863)
Fair value at end of period		$ 162,779	$ 180,157
[1] Represents changes due to collection / realization of expected cash flows over time.

X

- Definition

Decrease in mortgage servicing assets due to mandatory and other loan repurchases

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in market value of the mortgage servicing asset due to the impact of customer payments received during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	bpop_
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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- Definition

Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- References

No definition available.

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