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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