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Loans and Asset Quality Information (Schedule of Recorded Investment in Loans by Credit Quality Indicators) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Recorded investment in loans by credit quality indicators:    
Non-covered loans $ 2,267,634fbp_LoansReceivableNonCoveredGrossCarryingAmount $ 2,251,957fbp_LoansReceivableNonCoveredGrossCarryingAmount
Unamortized net deferred loan costs 946fbp_UnamortizedNetDeferredLoanCosts 928fbp_UnamortizedNetDeferredLoanCosts
Covered loans 127,594us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered 210,309us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Total loans 2,396,174fbp_Loans 2,463,194fbp_Loans
Non-covered [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 2,268,580fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		 2,252,885fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember
Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 37,284fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember		 37,015fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 106,974fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember		 122,280fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 22,470fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember		 21,176fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 257,515fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember		 244,670fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 846,833fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember		 869,387fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 198,577fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember		 198,127fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 754,785fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember		 709,606fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 43,196fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember		 49,696fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
Pass (Grades 1, 2 and 3) [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 742,115fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 563,666fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Covered loans 14,349us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 25,078us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Total loans 756,464fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 588,744fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 17,856fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 8,495fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 32,812fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 31,494fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 10,815fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 4,098fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 87,806fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 31,221fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 221,581fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 227,053fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 122,528fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 120,205fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 223,197fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 115,397fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass (Grades 1, 2 and 3) [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 25,520fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 25,703fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Pass - Acceptable/Average (Grade 4) [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 1,287,451fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 1,454,925fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Covered loans 70,989us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 92,147us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Total loans 1,358,440fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 1,547,072fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 15,649fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 24,415fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 62,361fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 77,441fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 9,928fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 12,800fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 135,072fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 181,050fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 520,790fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 540,349fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 62,642fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 63,400fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 465,395fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 533,680fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Pass - Acceptable/Average (Grade 4) [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 15,614fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 21,790fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember
Watch or Standard Loans (Grade 9) [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 15,620fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 19,101fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Covered loans 632us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		   
Total loans 16,252fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 19,101fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 5fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 7fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 62fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 100fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans      
Watch or Standard Loans (Grade 9) [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 771fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 2,365fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 4,536fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 5,062fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 1,135fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 1,499fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 9,057fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 10,014fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Watch or Standard Loans (Grade 9) [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 54fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 54fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember
Special Mention Loans (Grade 5) [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 97,002fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 93,442fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Covered loans 10,503us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 8,857us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Total loans 107,505fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 102,299fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 1,356fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,509fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 4,481fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 5,597fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 767fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 2,022fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 13,066fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 11,646fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 40,993fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 41,583fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 5,166fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 5,699fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 30,318fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 24,557fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Special Mention Loans (Grade 5) [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 855fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 829fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Classified Loans (Grades 6,7 and 8) [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 75,380fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 78,885fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Covered loans 20,613us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 47,010us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Total loans 95,993fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 125,895fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 2,231fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 2,367fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 4,331fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 4,986fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 506fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 1,711fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 12,909fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 10,333fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 34,474fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 37,526fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 4,533fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 5,124fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 15,748fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 15,843fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Classified Loans (Grades 6,7 and 8) [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 648fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 995fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Nonaccrual Loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 50,066fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 41,938fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Covered loans 10,508us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 37,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Total loans 60,574fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 79,155fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Commercial Unsecured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 187fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 222fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Commercial Secured [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 2,927fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 2,662fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Secured by Inventory and Accounts Receivable [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 454fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 545fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Real Estate construction, land development and other land loans [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 7,891fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 8,055fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Real estate residential, farmland and mutli-family [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 24,459fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 17,814fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Real estate home equity lines of credit [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 2,573fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 2,200fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Real estate commercial [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans 11,070fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 10,115fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember
Nonaccrual Loans [Member] | Consumer [Member]    
Recorded investment in loans by credit quality indicators:    
Non-covered loans $ 505fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 $ 325fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember