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Fair value of purchased MSRs, their related valuation assumptions and sensitivity to immediate changes in those assumptions (Detail) (Residential Mortgage, Purchased Mortgage Servicing Rights M S R [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Residential Mortgage | Purchased Mortgage Servicing Rights M S R [Member]
   
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]    
Interests Continued To Be Held By Transferor Fair Value $ 38,160us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
$ 45,346us-gaap_InterestsContinuedToBeHeldByTransferorFairValue
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Weighted average life (in years) 0 years 0 months 4015 days 0 years 0 months 3979 days
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed 9.10%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
9.20%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Impact on fair value of 10% adverse change (1,620)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
(1,969)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Impact on fair value of 20% adverse change (2,924)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
(3,478)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate 10.70%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
10.80%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Impact on fair value of 10% adverse change (1,603)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
(2,073)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
Impact on fair value of 20% adverse change $ (2,877)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember
$ (3,655)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= bpop_PurchasedMortgageServicingRightsMSRMember
/ us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOfAdverseChangeInAssumptionByTypeOfFinancialInstrumentAxis
= us-gaap_ResidentialMortgageMember