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Employee benefits - Plans target allocation by asset category (Details)	Dec. 31, 2021	Dec. 31, 2020
Popular Related Securities
Defined Benefit Plan Disclosure [Line Items]
Define benefit plan actual asset allocations	2.00%	1.00%
Popular Related Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	5.00%
Popular Related Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	0.00%
Equity
Defined Benefit Plan Disclosure [Line Items]
Define benefit plan actual asset allocations	30.00%	38.00%
Equity | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	70.00%
Equity | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	0.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Define benefit plan actual asset allocations	67.00%	60.00%
Debt Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	100.00%
Debt Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	0.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Define benefit plan actual asset allocations	1.00%	1.00%
Cash and Cash Equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	100.00%
Cash and Cash Equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets target allocation	0.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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