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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment 12-months    
Net Impact Revisions     $ 9,400
Banco Popular North America      
Financing Receivable, Modifications [Line Items]      
Recent Loss Trend Adjustment Percentage 0.11% 4.00%  
Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 1,246,577 $ 1,151,343  
Non Covered Loans | Banco Popular de Puerto Rico      
Financing Receivable, Modifications [Line Items]      
Change Allowance For Loan Losses Recalibration And Updates Of The Enviromental Factors Adjustments     $ 9,400
Recent Loss Trend Adjustment Percentage 38.00% 15.00%  
Commercial | Non Covered Loans      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings $ 260,044 $ 254,532  
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 $ 871,997 774,496  
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities      
Financing Receivable, Modifications [Line Items]      
Troubled debt restructurings 407,000 359,000  
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 $ 11,000