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Notes payable - Additional Information (Detail) (USD $)
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Debt Disclosure [Line Items]      
Amount Used From Proceeds Of Issuance Of Debt   $ 400,000,000  
Popular Capital Trust I I I [Member]
     
Debt Disclosure [Line Items]      
Trust Preferred Securities   935,000,000  
Fixed Rate 700 Percent Notes Due July 2019 [Member]
     
Debt Disclosure [Line Items]      
Senior Long Term Notes 450,000,000 450,000,000 0
Fixed Rate 500 Percent Until December 2013 And 900 Percent Thereafter Junior Subordinated Deferrable Interest Debentures With No Stated Maturity [Member]
     
Debt Disclosure [Line Items]      
Debt Instrument Unamortized Discount And Fee Amount   $ 414,100,000