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Employee benefits - Plans target allocation by asset category (Details) | Dec. 31, 2019 | Dec. 31, 2018
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Popular Related Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Define benefit plan actual asset allocations | 1.00% | 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 | 36.00% | 32.00%
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 | 62.00% | 65.00%
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% | 2.00%
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=118257860&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=118255775&loc=d3e1928-114920 + Details
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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=118255775&loc=d3e1928-114920 + Details
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