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Goodwill and other intangible assets - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Fully Amortized Intangibles [Member]
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            
Amortization Of Intangible Assets 10,072,000 9,654,000 9,173,000          
Indefinite-lived Intangible Assets, Acquired During Period   14,000,000            
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        
Finite-Lived Customer Relationships, Gross       4,000,000        
Goodwill 647,757,000 648,350,000 647,387,000   402,000,000      
Approximate Amount             222,000,000 472,000,000
Amount Implied Fair Value         $ 338,000,000 $ 701,000,000    
Percent That The Average Reporting Unit Estimated Fair Value Calculated In Step 1 Exceeds Equity Value And Still Does Not Require A Step 2 Analysis 9.00% 20.00%            
Percent Amount That The Estimated Implied Fair Value Of Goodwill Calculated In Step 2 Exceeds Goodwill Carrying Amount And Would Still Not Be Required To Record An Impairment 46.00% 64.00%