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

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