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LOAN PORTFOLIO - Corporation's Credit Quality Indicators by Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans $ 1,649,263us-gaap_LoansReceivableCommercialMortgage $ 1,665,787us-gaap_LoansReceivableCommercialMortgage
Construction loans 124,440us-gaap_LoansReceivableCommercialConstruction 123,480us-gaap_LoansReceivableCommercialConstruction
Commercial and Industrial loans 2,442,867fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions 2,479,437fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
Land 54,190us-gaap_LoansReceivableCommercialDevelopment 55,921us-gaap_LoansReceivableCommercialDevelopment
Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 42,794us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember		 42,997us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 27,456us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember		 24,562us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 227,195us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 273,027us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial and Industrial loans 229,112fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 234,926fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Land 15,930us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 16,915us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 12,265us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 13,548us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Substandard [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 11,790us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 11,790us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 897us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial and Industrial loans 6,293fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 4,884fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Land 0us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Doubtful [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 808us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 776us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Doubtful [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Unlikely To Be Collected Financing Receivable [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 0us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Commercial and Industrial loans 789fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 801fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Land 0us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 0us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Unlikely To Be Collected Financing Receivable [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Unlikely To Be Collected Financing Receivable [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember		 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Total Adversely Classified [Member]    
Financing Receivable Recorded Investment [Line Items]    
Commercial mortgage loans 227,195us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1] 273,924us-gaap_LoansReceivableCommercialMortgage
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1]
Commercial and Industrial loans 236,194fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1] 240,611fbp_CommercialAndIndustrialLoansIncludingFinancialInstitutions
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1]
Land 15,930us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1] 16,915us-gaap_LoansReceivableCommercialDevelopment
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1]
Total Adversely Classified [Member] | Residential Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans 13,073us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1] 14,324us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ResidentialConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1]
Total Adversely Classified [Member] | Commercial Construction [Member]    
Financing Receivable Recorded Investment [Line Items]    
Construction loans $ 11,790us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1] $ 11,790us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_TotalAdverselyClassifiedMember		 [1]
[1] Excludes $54.6 million ($7.8 million land, $39.1 million construction-commercial, $0.9 million construction-residential, and $ 6.8 million commercial mortgage) as of March 31, 2015 and December 31, 2014, of non-performing loans held for sale.