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Note Related party transactions (Related party transactions with affiliated company - Additional Information) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
May 01, 2017
Apr. 01, 2010
Related Party With Investment Companies [Member]        
Related Party Transaction [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 357.0 $ 357.0    
Administrative Fees 5.8 6.0    
Waived Fees 1.7 2.1    
Net Fees $ 4.1 $ 3.9    
Credit Facilities Terms $200 million or 10% of BPPR’s capital      
Loan | Unpaid Principal Balance | Related Party Transaction loan sold between BPPR and Popular Inc. [Member]        
Related Party Transaction [Line Items]        
Loan Sold To Popular Inc. $ 37.7   $ 37.9  
Loan | Chief Executive Officer | Unpaid Principal Balance | Related Party Transaction loan sold between BPPR and Popular Inc. [Member]        
Related Party Transaction [Line Items]        
Loans Receivable Related Parties       $ 40.2
Popular Inc. | Chief Executive Officer | Related Party Transaction loan sold between BPPR and Popular Inc. [Member]        
Related Party Transaction [Line Items]        
Other Additional Capital     $ 6.0