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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]        
Recent Loss Trend Adjustment   12-months    
Provision for Loan and Lease Losses   $ 253,936 $ 128,651  
Hurricanes        
Financing Receivable, Modifications [Line Items]        
Provision for Loan and Lease Losses $ 69,887      
Banco Popular North America        
Financing Receivable, Modifications [Line Items]        
Recent Loss Trend Adjustment Percentage   5.00% 4.00%  
Non Covered Loans        
Financing Receivable, Modifications [Line Items]        
Troubled debt restructurings 1,263,875 $ 1,263,875   $ 1,246,577
Non Covered Loans | Banco Popular de Puerto Rico        
Financing Receivable, Modifications [Line Items]        
Recent Loss Trend Adjustment Percentage   45.00% 49.00%  
Commercial | Non Covered Loans        
Financing Receivable, Modifications [Line Items]        
Troubled debt restructurings 229,841 $ 229,841   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 924,902 $ 924,902   871,997
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities        
Financing Receivable, Modifications [Line Items]        
Troubled debt restructurings 444,000 444,000   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 $ 8,000 $ 8,000   $ 8,000