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Loans and Asset Quality Information (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Jul. 02, 2014 | Jun. 30, 2014
Total Covered Loans - Carrying Value | $ 119,829,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | $ 190,551,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | $ 127,594,000 us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered |  |
Foreclosed real estate - covered | 2,055,000 fbp_ForeclosedRealEstateCovered | 19,504,000 fbp_ForeclosedRealEstateCovered | 2,350,000 fbp_ForeclosedRealEstateCovered |  |
Nonaccrual loans | 56,012,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  | 60,574,000 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  |
Accretion of loan discount | 1,557,000 fbp_AccretionOfLoanDiscount |  | 16,009,000 fbp_AccretionOfLoanDiscount |  |
Percentage of loan discount accretion | 80.00%fbp_PercentageOfLoanDiscountAccretion |  |  |  |
Payments that exceeded the initial carrying amount on purchased impaired loans | 0 fbp_PaymentsThatExceededInitialCarryingAmountOnPurchasedImpairedLoans | 179,000 fbp_PaymentsThatExceededInitialCarryingAmountOnPurchasedImpairedLoans |  |  |
Contractual balance of nonaccrual loans | 14,100,000 fbp_ContractualBalanceOfNonaccrualLoans | 49,300,000 fbp_ContractualBalanceOfNonaccrualLoans | 16,000,000 fbp_ContractualBalanceOfNonaccrualLoans |  |
Purchased Nonimpaired Loans [Member] |  |  |  |  |
Loan discount on loans | 16,365,000 fbp_LoanDiscount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_PurchasedNonimpairedLoansMember |  |  |  |
Purchased Nonperfoming Loans [Member] |  |  |  |  |
Loan discount on loans | 2,687,000 fbp_LoanDiscount / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fbp_PurchasedNonperfomingLoansMember |  |  |  |
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

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- Definition Theaccrection of the discount on loans. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The contractual balance of nonaccrual loans. + References No definition available. + Details
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Balance Type: | credit
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangemen covered by loss sharing agreements. + References No definition available. + Details
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- Definition The amount of discount on nonimpaired purchased loans. + References No definition available. + Details
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- Definition Refers to payments that exceeded initial carrying values of purchased impaired laons. + References No definition available. + Details
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- Definition Percentage of loan discount accretion that will reduce the indemnification asset. + References No definition available. + Details
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- Definition The total value of loans transferred to non-covered status. + References No definition available. + Details
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- Definition The amount of allowance for loan losses transferred from covered to non-covered during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5111-111524 + Details
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- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
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