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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment 12-months    
Popular Bank      
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment Percentage 6.00% 2.00%  
Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 1,409,929   $ 1,258,327
Non Covered Loans | Banco Popular de Puerto Rico      
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment Percentage 78.00% 39.00%  
Commercial | Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 330,039   220,846
Mortgage and consumer      
Financing Receivable, Modifications [Line Items]      
Historical Loss Period 18-months    
Commercial and construction      
Financing Receivable, Modifications [Line Items]      
Historical Loss Period 5-year    
Mortgages | Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 967,125   930,076
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings 474,000   449,000
Loan | Commercial      
Financing Receivable, Modifications [Line Items]      
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings $ 17,000   $ 8,000