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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Income Taxes [Line Items]        
Deferred Tax Assets Net $ 812,819,000us-gaap_DeferredTaxAssetsNet $ 761,768,000us-gaap_DeferredTaxAssetsNet    
Income Tax Examination Minimum Likelihood Of Tax Benefits Being Realized Upon Ultimate Settlement 50.00%bpop_IncomeTaxExaminationMinimumLikelihoodOfTaxBenefitsBeingRealizedUponUltimateSettlement      
Unrecognized Tax Benefits Interest On Income Taxes Accrued 3,100,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 3,600,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Income Tax Examination Penalties Accrued 0us-gaap_IncomeTaxExaminationPenaltiesAccrued 0us-gaap_IncomeTaxExaminationPenaltiesAccrued    
Unrecognized Tax Benefits That Would Impact Effective Tax Rate 9,800,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 11,900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Unrecognized Tax Benefits Expected Decreases Resulting From Settlements With Taxing Authorities 6,700,000bpop_UnrecognizedTaxBenefitsExpectedDecreasesResultingFromSettlementsWithTaxingAuthorities      
Unrecognized Tax Benefits Current Interest On Income Taxes Accrued 540,000bpop_UnrecognizedTaxBenefitsCurrentInterestOnIncomeTaxesAccrued 1,400,000bpop_UnrecognizedTaxBenefitsCurrentInterestOnIncomeTaxesAccrued    
Income Tax Expense Benefit 58,279,000us-gaap_IncomeTaxExpenseBenefit (251,327,000)us-gaap_IncomeTaxExpenseBenefit (26,403,000)us-gaap_IncomeTaxExpenseBenefit  
Deferred Tax Liabilities 158,049,000us-gaap_DeferredTaxLiabilities 134,528,000us-gaap_DeferredTaxLiabilities    
Deferred Tax Assets Valuation Allowance 1,212,748,000us-gaap_DeferredTaxAssetsValuationAllowance 1,257,977,000us-gaap_DeferredTaxAssetsValuationAllowance    
Prepaid Taxes 198,120,000us-gaap_PrepaidTaxes 91,504,000us-gaap_PrepaidTaxes    
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate 7,000,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,400,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 4,400,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Fixed Rate 700 Percent Notes Due July 2019 [Member]        
Income Taxes [Line Items]        
Senior Long Term Notes 450,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= bpop_FixedRate700PercentNotesDueJuly2019Member
0us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= bpop_FixedRate700PercentNotesDueJuly2019Member
  450,000,000us-gaap_SeniorLongTermNotes
/ us-gaap_DebtInstrumentAxis
= bpop_FixedRate700PercentNotesDueJuly2019Member
Other Liabilities Member        
Income Taxes [Line Items]        
Deferred Tax Liabilities 34,000,000us-gaap_DeferredTaxLiabilities
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_OtherLiabilitiesMember
2,000,000us-gaap_DeferredTaxLiabilities
/ us-gaap_InformationByFinancialStatementLineItemAxis
= us-gaap_OtherLiabilitiesMember
   
PUERTO RICO        
Income Taxes [Line Items]        
Marginal Income Tax Rate   39.00%bpop_MarginalIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
30.00%bpop_MarginalIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
 
Income Tax Expense Benefit 58,279,000us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_PR
(251,327,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_PR
(26,403,000)us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementGeographicalAxis
= country_PR
 
Income Tax Reconciliation Change in Deferred Tax Asset 20,048,000bpop_IncomeTaxReconciliationChangeInDeferredTaxAsset
/ us-gaap_StatementGeographicalAxis
= country_PR
(197,467,000)bpop_IncomeTaxReconciliationChangeInDeferredTaxAsset
/ us-gaap_StatementGeographicalAxis
= country_PR
0bpop_IncomeTaxReconciliationChangeInDeferredTaxAsset
/ us-gaap_StatementGeographicalAxis
= country_PR
 
Capital Gains Tax Rate 20.00%bpop_CapitalGainsTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
15.00%bpop_CapitalGainsTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
   
Unrecognized Tax Benefits Period Increases Decreases (3,601,000)bpop_UnrecognizedTaxBenefitsPeriodIncreasesDecreases
/ us-gaap_StatementGeographicalAxis
= country_PR
(7,727,000)bpop_UnrecognizedTaxBenefitsPeriodIncreasesDecreases
/ us-gaap_StatementGeographicalAxis
= country_PR
(8,985,000)bpop_UnrecognizedTaxBenefitsPeriodIncreasesDecreases
/ us-gaap_StatementGeographicalAxis
= country_PR
 
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate (51,570,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
135,720,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
65,662,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
/ us-gaap_StatementGeographicalAxis
= country_PR
 
ValuationAllowanceDeferredTaxAssetChangeInAmount 8,034,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_PR
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_PR
0us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_StatementGeographicalAxis
= country_PR
 
Dividends Received Deduction From Controlled Subsidiary Percentage 100.00%bpop_DividendsReceivedDeductionFromControlledSubsidiaryPercentage
/ us-gaap_StatementGeographicalAxis
= country_PR
     
Dividends Received Deductions From Other Taxable Domestic Corporations Percentage 85.00%bpop_DividendsReceivedDeductionsFromOtherTaxableDomesticCorporationsPercentage
/ us-gaap_StatementGeographicalAxis
= country_PR
     
PUERTO RICO | Sale Non Performing Loans [Member]        
Income Taxes [Line Items]        
Income Tax Expense Benefit   146,400,000us-gaap_IncomeTaxExpenseBenefit
/ bpop_SaleLoanAxis
= bpop_SaleNonPerformingLoansMember
/ us-gaap_StatementGeographicalAxis
= country_PR
   
PUERTO RICO | Westernbank Assets Capital Gain Treatment [Member]        
Income Taxes [Line Items]        
Prepaid Taxes     72,900,000us-gaap_PrepaidTaxes
/ us-gaap_StatementGeographicalAxis
= country_PR
/ bpop_TaxTreatmentAxis
= bpop_WesternbankAssetsCapitalGainTreatmentMember
 
PUERTO RICO | Westernbank Assets Capital Gain Treatment [Member] | Closing Agreement with the Puerto Rico Department of Treasury [Member]        
Income Taxes [Line Items]        
Income Taxes Paid 45,000,000us-gaap_IncomeTaxesPaid
/ bpop_ClosingAgreementAxis
= bpop_ClosingAgreementWithPuertoRicoDepartmentOfTreasuryMember
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= country_PR
/ bpop_TaxTreatmentAxis
= bpop_WesternbankAssetsCapitalGainTreatmentMember
     
Income Tax Expense Benefit 23,400,000us-gaap_IncomeTaxExpenseBenefit
/ bpop_ClosingAgreementAxis
= bpop_ClosingAgreementWithPuertoRicoDepartmentOfTreasuryMember
/ us-gaap_StatementGeographicalAxis
= country_PR
/ bpop_TaxTreatmentAxis
= bpop_WesternbankAssetsCapitalGainTreatmentMember
     
PUERTO RICO | Net [Member]        
Income Taxes [Line Items]        
Deferred Tax Assets Net 812,000,000us-gaap_DeferredTaxAssetsNet
/ us-gaap_StatementGeographicalAxis
= country_PR
/ us-gaap_StatementScenarioAxis
= bpop_NetMember
     
Banco Popular Puerto Rico Qualified Pension Plan [Member]        
Income Taxes [Line Items]        
Deferred Tax Assets Other Tax 47,200,000us-gaap_DeferredTaxAssetsOtherTaxCarryforwards
/ us-gaap_StatementGeographicalAxis
= bpop_BancoPopularPuertoRicoQualifiedPensionPlanMember
     
Deferred Tax Assets, Other Loss Carryforwards 57,800,000us-gaap_DeferredTaxAssetsOtherLossCarryforwards
/ us-gaap_StatementGeographicalAxis
= bpop_BancoPopularPuertoRicoQualifiedPensionPlanMember
     
E V E R T E C Inc [Member] | Sale of stock [Member]        
Income Taxes [Line Items]        
Income Tax Expense Benefit   23,700,000us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= bpop_EVERTECIncMember
/ us-gaap_SubsidiarySaleOfStockAxis
= bpop_SaleOfStockMember
   
Parent Company [Member] | Fixed Rate 700 Percent Notes Due July 2019 [Member]        
Income Taxes [Line Items]        
Deferred Tax Assets Valuation Allowance $ 17,800,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_DebtInstrumentAxis
= bpop_FixedRate700PercentNotesDueJuly2019Member
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember