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Goodwill and other intangible assets - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2012
Banco Popular North America [Member]
Jul. 31, 2011
Banco Popular North America [Member]
Jul. 31, 2012
Banco Popular De Puerto Rico [Member]
Jul. 31, 2011
Banco Popular De Puerto Rico [Member]
Goodwill and Intangible Assets Disclosure [Line Items]                    
Indefinite Lived Intangible Assets $ 6,000,000   $ 6,000,000   $ 6,000,000          
Amortization Of Intangible Assets 2,481,000 2,463,000 7,605,000 6,973,000            
Cashflow Value Discount Rates Low End Of Range             11.93%      
Cashflow Value Discount Rates High End Of Range             18.38%      
Loan Portfolio Fair Value Discount             18.20% 28.00%    
Percentage Of Goodwill     97.00%              
Finite-Lived Core Deposits, Gross 3,000,000   3,000,000              
Finite-Lived Customer Relationships, Gross 4,000,000   4,000,000              
Goodwill 647,757,000 648,353,000 647,757,000 648,353,000 648,350,000 647,387,000 402,000,000      
Approximate Amount                 222,000,000 472,000,000
Amount Implied Fair Value             $ 338,000,000 $ 701,000,000