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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Financing Receivable      
Recent Loss Trend Adjustment 12-months    
Net Impact Revisions $ 9,400    
Banco Popular North America      
Financing Receivable      
Recent Loss Trend Adjustment Percentage 4.00% 17.00%  
Non Covered Loans      
Financing Receivable      
Troubled debt restructurings $ 1,209,121   $ 1,151,343
Non Covered Loans | Banco Popular de Puerto Rico      
Financing Receivable      
Change Allowance For Loan Losses Recalibration And Updates Of The Enviromental Factors Adjustments $ 9,400    
Recent Loss Trend Adjustment Percentage 49.00% 18.00%  
Commercial | Non Covered Loans      
Financing Receivable      
Troubled debt restructurings $ 248,253   254,532
Mortgage and consumer      
Financing Receivable      
Historical Loss Period 18-months    
Commercial and construction      
Financing Receivable      
Historical Loss Period 5-year    
Mortgages | Non Covered Loans      
Financing Receivable      
Troubled debt restructurings $ 844,675   774,496
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities      
Financing Receivable      
Troubled debt restructurings 395,000   359,000
Loan | Commercial      
Financing Receivable      
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings $ 8,000   $ 11