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Loans and Asset Quality Information (Narrative) (Details) (USD $)
 0 Months Ended 12 Months Ended
Jul. 02, 2014
item
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Number of loss share agreements expired 1fbp_NumberOfLossShareAgreementExpired        
Total Covered Loans - Carrying Value   $ 127,594,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered $ 210,309,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered    
Foreclosed real estate - covered   2,350,000fbp_ForeclosedRealEstateCovered 24,497,000fbp_ForeclosedRealEstateCovered    
Nonaccrual loans   60,574,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 79,155,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus    
Transfers to non-covered loans due to expiration of loss-share agreement   (38,987,000)fbp_TransfersToNonCoveredLoans      
Unamortized premiums on loans   0us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther 98,000us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiumsOther    
Loans pledged as collateral   1,900,000,000us-gaap_LoansPledgedAsCollateral 1,800,000,000us-gaap_LoansPledgedAsCollateral    
Loans to officers and directors   5,300,000us-gaap_DueFromRelatedParties 4,200,000us-gaap_DueFromRelatedParties    
Additions to loans, officers and directors   2,300,000us-gaap_RepaymentsOfRelatedPartyDebt      
Repayments of loans, officers and directors   1,200,000us-gaap_ProceedsFromRelatedPartyDebt      
Accretion of loan discount   16,009,000fbp_AccretionOfLoanDiscount 20,200,000fbp_AccretionOfLoanDiscount    
Percentage of loan discount accretion   80.00%fbp_PercentageOfLoanDiscountAccretion      
Payments that exceeded the initial carrying amount on purchased impaired loans   179,000fbp_PaymentsThatExceededInitialCarryingAmountOnPurchasedImpairedLoans 62,000fbp_PaymentsThatExceededInitialCarryingAmountOnPurchasedImpairedLoans    
Contractual balance of nonaccrual loans   16,000,000fbp_ContractualBalanceOfNonaccrualLoans 60,400,000fbp_ContractualBalanceOfNonaccrualLoans    
Restructured Loans [Member]          
Interest Income   3,045,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		 2,674,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		 2,392,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		  
Interest income, actually collected   2,003,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		 1,681,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		 1,179,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_RestructuredLoansMember		  
Nonaccrual Loans [Member]          
Interest Income   4,115,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		 5,262,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		 7,689,000us-gaap_InterestAndFeeIncomeLoansAndLeases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		  
Interest income, actually collected   1,176,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		 1,414,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		 2,824,000fbp_InterestIncomeActuallyCollected
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= fbp_NonaccrualFinancingReceivableMember		  
Special Mention Loans (Grade 5) [Member]          
Total Covered Loans - Carrying Value   10,503,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 8,857,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		    
Classified [Member]          
Total Covered Loans - Carrying Value   20,613,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		 47,010,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember		    
Nonaccrual Loans [Member]          
Total Covered Loans - Carrying Value   10,508,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		 37,217,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember		    
Purchased Nonimpaired Loans [Member]          
Loan discount on loans   17,598,000fbp_LoanDiscount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_PurchasedNonimpairedLoansMember		      
Purchased Nonperfoming Loans [Member]          
Loan discount on loans   3,239,000fbp_LoanDiscount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_PurchasedNonperfomingLoansMember		      
Non-covered [Member]          
Nonaccrual loans   50,066,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		 41,938,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		    
Transfers to non-covered loans due to expiration of loss-share agreement 9,700,000fbp_TransfersToNonCoveredLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_NonCoveredMember		        
Restructured Loans [Member]          
Transfers to non-covered loans due to expiration of loss-share agreement 2,100,000fbp_TransfersToNonCoveredLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_RestructuredLoansMember		        
Foreclosed Real Estate - Covered [Member]          
Transfers to non-covered loans due to expiration of loss-share agreement 3,000,000fbp_TransfersToNonCoveredLoans
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fbp_ForeclosedRealEstateCoveredMember		        
Covered Loss Sharing Subsequent Change to Noncovered [Member]          
Total Covered Loans - Carrying Value         39,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
Foreclosed real estate - covered         3,000,000fbp_ForeclosedRealEstateCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
Nonaccrual loans         9,700,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
Restructured loans - accruing         2,100,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
Transfer of allowance of loan losses from covered to non-covered 1,700,000fbp_TransferOfAllowanceOfLoanLossesFromCoveredToNonCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember		        
Total loans transferred to non-covered status         39,700,000fbp_TotalLoansTransferredToNoncoveredStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Special Mention Loans (Grade 5) [Member]          
Total Covered Loans - Carrying Value         2,800,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Classified [Member]          
Total Covered Loans - Carrying Value         5,500,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_ClassifiedMember
Covered Loss Sharing Subsequent Change to Noncovered [Member] | Nonaccrual Loans [Member]          
Total Covered Loans - Carrying Value         $ 9,700,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fbp_CoveredLossSharingProtectionChangeMember
/ us-gaap_InternalCreditAssessmentAxis
= fbp_NonaccrualFinancingReceivableMember