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Note Income taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]      
Deferred Tax Assets Net $ 1,049,895 $ 1,035,110  
Unrecognized Tax Benefits Interest On Income Taxes Accrued 2,800 2,700  
Income Tax Examination Penalties Accrued 0 0  
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 9,000 9,000  
Recognized Tax Benefits Current Interest On Income Taxes Accrued 615 598  
Deferred Tax Liabilities 96,406 154,049  
Deferred Tax Assets Valuation Allowance 496,307 447,824  
Unrecognized Tax Benefits Expected Decreases Resulting From Settlements With Taxing Authorities 4,700    
Income Tax Expense Benefit $ 119,579 $ 230,830 $ 78,784
Corporate Income Tax Rate 21.00% 35.00%  
Popular, Inc. Holding Co.      
Income Taxes [Line Items]      
Deferred Tax Assets Valuation Allowance $ 90,000    
Income Tax Expense Benefit 0 $ 0 19
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 926 1,300  
PUERTO RICO      
Income Taxes [Line Items]      
Deferred Tax Assets Net 721,000    
Deferred Tax Liabilities 68,483 128,615  
Deferred Tax Assets Valuation Allowance $ 89,852 67,263  
Dividends Received Deduction From Controlled Subsidiary Percentage 100.00%    
Dividends Received Deductions From Other Taxable Domestic Corporations Percentage 85.00%    
Income Tax Expense Benefit $ 119,579 $ 230,830 $ 78,784
Computed income tax at statutory rates 39.00% 39.00% 39.00%
Income tax expense recognized attributable to Law Act No. 257 $ 27,700    
Corporate Income Tax Rate 37.50% 39.00%  
UNITED STATES      
Income Taxes [Line Items]      
Deferred Tax Assets Net $ 328,000    
Deferred Tax Liabilities 27,923 $ 25,434  
Deferred Tax Assets Valuation Allowance 406,455 380,561  
Deferred Tax Assets 734,000    
Income tax expense attributable to Tax Cuts and Job Act   $ 168,400  
Computed income tax at statutory rates   21.00% 35.00%
Banco Popular Puerto Rico Qualified Pension Plan      
Income Taxes [Line Items]      
Deferred Tax Assets Other Tax $ 42,200