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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
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Recorded investment in loans by credit quality indicators:      
Non-covered loans $ 2,274,787fbp_LoansReceivableNonCoveredGrossCarryingAmount $ 2,267,634fbp_LoansReceivableNonCoveredGrossCarryingAmount  
Unamortized net deferred loan costs 783fbp_UnamortizedNetDeferredLoanCosts 946fbp_UnamortizedNetDeferredLoanCosts 759fbp_UnamortizedNetDeferredLoanCosts
Covered loans 119,829us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered 127,594us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered 190,551us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Total loans 2,395,399fbp_Loans 2,396,174fbp_Loans 2,447,277fbp_Loans
Non-covered [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 2,275,570fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		 2,268,580fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		  
Commercial Unsecured [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 36,524fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember		 37,284fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember		  
Commercial Secured [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 120,901fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember		 106,974fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember		  
Secured by Inventory and Accounts Receivable [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 24,496fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember		 22,470fbp_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 256,851fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember		 257,515fbp_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 838,651fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember		 846,833fbp_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 199,176fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember		 198,577fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember		  
Real estate commercial [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 757,018fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember		 754,785fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember		  
Consumer [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 41,170fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember		 43,196fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember		  
Pass (Grades 1, 2 and 3) [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 784,324fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 742,115fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Covered loans 13,363us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 14,349us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		  
Total loans 797,687fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 756,464fbp_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 18,177fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 17,856fbp_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 50,695fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 32,812fbp_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 10,641fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 10,815fbp_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 91,840fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 87,806fbp_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 222,114fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 221,581fbp_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 122,598fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 122,528fbp_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 242,960fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 223,197fbp_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 25,299fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 25,520fbp_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 1,260,260fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 1,287,451fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		  
Covered loans 67,274us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 70,989us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		  
Total loans 1,327,534fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 1,358,440fbp_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 14,735fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 15,649fbp_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 59,418fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 62,361fbp_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 12,331fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 9,928fbp_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 132,494fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 135,072fbp_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 514,229fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 520,790fbp_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 63,401fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 62,642fbp_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 449,463fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 465,395fbp_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 14,189fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_PassAcceptableAverageMember		 15,614fbp_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 15,786fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 15,620fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		  
Covered loans 683us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 632us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		  
Total loans 16,469fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 16,252fbp_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		 5fbp_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 61fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 62fbp_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 846fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 771fbp_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 4,845fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 4,536fbp_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 1,549fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 1,135fbp_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 8,427fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_WatchStandardMember		 9,057fbp_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 53fbp_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 95,779fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 97,002fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Covered loans 9,254us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 10,503us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		  
Total loans 105,033fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 107,505fbp_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 1,258fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 1,356fbp_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 3,996fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 4,481fbp_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 329fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 767fbp_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 14,570fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 13,066fbp_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 40,088fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 40,993fbp_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 5,010fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 5,166fbp_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 29,843fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 30,318fbp_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 685fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 855fbp_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 71,222fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 75,380fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		  
Covered loans 20,659us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 20,613us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		  
Total loans 91,881fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 95,993fbp_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 2,132fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 2,231fbp_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 3,733fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 4,331fbp_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 659fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 506fbp_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 10,305fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 12,909fbp_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 34,004fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 34,474fbp_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 4,478fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 4,533fbp_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 15,298fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 15,748fbp_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 613fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 648fbp_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 47,416fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 50,066fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		  
Covered loans 8,596us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 10,508us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		  
Total loans 56,012fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 60,574fbp_Loans
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		  
Nonaccrual Loans [Member] | Commercial Unsecured [Member]      
Recorded investment in loans by credit quality indicators:      
Non-covered loans 217fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialUnsecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 187fbp_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 2,998fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CommercialSecuredMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 2,927fbp_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 536fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_SecuredInventoryAccountsReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 454fbp_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 6,796fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 7,891fbp_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 23,371fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateResidentialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 24,459fbp_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 2,140fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateHomeEquityMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 2,573fbp_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 11,027fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_RealEstateCommercialMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 11,070fbp_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 $ 331fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 $ 505fbp_LoansReceivableNonCoveredGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_ConsumerMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember