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Securities (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Securities [Abstract] |  |  |
Collateralized mortage obligations, amortized cost | $ 108,000 fbp_CollateralizedMortageObligationsAmortizedCost | $ 192,000 fbp_CollateralizedMortageObligationsAmortizedCost |
Collateralized mortage obligations, fair value | 111,000 fbp_CollateralizedMortageObligationsFairValue | 200,000 fbp_CollateralizedMortageObligationsFairValue |
Federal Home Loan Bank Stock, cost | 6,016,000 us-gaap_FederalHomeLoanBankStock | 3,894,000 us-gaap_FederalHomeLoanBankStock |
Investment securities, pledged as collateral for public deposits | 100,113,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments | 79,838,000 us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments |
Sales of investment securities | 47,473,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds | 12,908,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds | 9,641,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Net realized gains of investment securities | 786,000 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments | 525,000 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments | 439,000 us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Net realized gain on the call of municipal securities |  | $ 7,000 fbp_NetRealizedGainOnCallOfMunicipalSecurities | $ 200,000 fbp_NetRealizedGainOnCallOfMunicipalSecurities

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- Definition The amortized cost of collateralized mortgage obligations. + References No definition available. + Details
Name: | fbp_CollateralizedMortageObligationsAmortizedCost
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value of collateralized mortgage obligations. + References No definition available. + Details
Name: | fbp_CollateralizedMortageObligationsFairValue
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The net realized gains on call of municipal securities during the period. + References No definition available. + Details
Name: | fbp_NetRealizedGainOnCallOfMunicipalSecurities
Namespace Prefix: | fbp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | fbp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
Name: | us-gaap_DepositLiabilitiesCollateralIssuedFinancialInstruments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
Name: | us-gaap_FederalHomeLoanBankStock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration