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Name of issuers, and the aggregate amortized cost and fair value of the securities of such issuer, in which the aggregate amortized cost exceeds 10% of stockholders' equity (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Federal National Mortgage Association Certificates And Obligations FNMA Member    
Investment Holdings [Line Items]    
Amortized Cost $ 1,746,807bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 $ 2,318,171bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Fair Value 1,736,987us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 2,266,610us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Federal Home Loan Bank Certificates And Obligations FHLB Member    
Investment Holdings [Line Items]    
Amortized Cost 737,149bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember		 336,933bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Fair Value 732,894us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember		 326,220us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Federal Home Loan Mortgage Corporation Certificates And Obligations FHLMC Member    
Investment Holdings [Line Items]    
Amortized Cost 1,117,865bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 1,434,346bpop_MarketableSecuritiesAmortizedCost
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Fair Value $ 1,112,485us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 $ 1,418,216us-gaap_MarketableSecurities
/ invest_InvestmentIssuerAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember