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Note Income taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets Net | $ 1,144,417 |  | $ 1,144,417 |  | $ 1,035,110
Unrecognized Tax Benefits Interest On Income Taxes Accrued | 2,700 |  | 2,700 |  | 2,700
Unrecognized Tax Benefits That Would Impact Effective Tax Rate | 8,900 |  | 8,900 |  | 9,000
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit | 4,600 |  | 4,600 |  |
Recognized Tax Benefits Current Interest On Income Taxes Accrued |  |  | 477 | $ 458 |
Deferred Tax Liabilities | 79,139 |  | 79,139 |  | 154,049
Deferred Tax Assets Valuation Allowance | 505,444 |  | 505,444 |  | 447,824
Interest Expense Reversal Due To Expiration Of The Statute Of Limitation |  |  | 483 |  |
Income Tax Expense Benefit | 42,018 | $ (19,966) | 35,613 | 48,772 |
Popular, Inc. Holding Co. |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets Valuation Allowance | 84,000 |  | 84,000 |  |
Income Tax Expense Benefit | 0 | 0 | 0 | 0 |
Closing Agreement with the Puerto Rico Department of Treasury |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income Tax Expense Benefit | 108,900 |  |  |  |
FDIC Termination Agreement |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income Tax Expense Benefit | 45,000 |  |  |  |
"Deemed sale" incremental tax liability at the capital gains rate | Closing Agreement with the Puerto Rico Department of Treasury |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income Tax Expense Benefit | 49,800 |  |  |  |
Increase in the deferred tax asset due to increase in the tax basis of the loans | Closing Agreement with the Puerto Rico Department of Treasury |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income Tax Expense Benefit | 158,700 |  |  |  |
Other liabilities |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Liabilities | 1,600 |  | 1,600 |  | 1,300
PUERTO RICO |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets Net | 805,000 |  | 805,000 |  |
Deferred Tax Liabilities | 57,490 |  | 57,490 |  | 128,615
Deferred Tax Assets Valuation Allowance | 84,282 |  | 84,282 |  | 67,263
Income Tax Expense Benefit | 42,018 | (19,966) | 35,613 | 48,772 |
PUERTO RICO | Unrecognized tax benefits |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Unrecognized tax benefits | (1,621) | $ (1,185) | (1,621) | $ (1,185) |
UNITED STATES |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets Net | 338,000 |  | 338,000 |  |
Deferred Tax Liabilities | 21,649 |  | 21,649 |  | 25,434
Deferred Tax Assets Valuation Allowance | 421,162 |  | 421,162 |  | $ 380,561
Deferred Tax Assets | $ 759,000 |  | $ 759,000 |  |

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- Definition This element represents the amount of interest expense recognized during the year for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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