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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment 12-months    
Banco Popular North America      
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment Percentage 0.35% 2.00%  
Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 1,255,355   $ 1,246,577
Non Covered Loans | Banco Popular de Puerto Rico      
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment Percentage 55.00% 44.00%  
Commercial | Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 250,809   260,044
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 $ 891,740   871,997
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings 421,000   407,000
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 $ 10,000   $ 8,000