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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Securities available for sale:    
Amortized Cost $ 164,724us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 175,061us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value 164,034us-gaap_AvailableForSaleSecurities 173,041us-gaap_AvailableForSaleSecurities
Unrealized Gain 830fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime 1,531fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
Unrealized (losses) (1,520)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime (3,551)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
Securities held to maturity:    
Amortized Cost 178,687us-gaap_HeldToMaturitySecurities 53,995us-gaap_HeldToMaturitySecurities
Fair Value 182,411us-gaap_HeldToMaturitySecuritiesFairValue 56,700us-gaap_HeldToMaturitySecuritiesFairValue
Unrealized Gain 3,832fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime 2,709fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
Unrealized (losses) (108)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime (4)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime
US Government-sponsored enterprises securities [Member]    
Securities available for sale:    
Amortized Cost 27,546us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
18,432us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value 27,521us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
18,245us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Gain 33fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
32fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized (losses) (58)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
(219)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Mortgage-backed securities [Member]    
Securities available for sale:    
Amortized Cost 130,073us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
148,646us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Fair Value 129,510us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
147,187us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Unrealized Gain 751fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
1,415fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Unrealized (losses) (1,314)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(2,874)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
Securities held to maturity:    
Amortized Cost 124,924us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
  
Fair Value 124,861us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
  
Unrealized Gain 45fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
  
Unrealized (losses) (108)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
  
Corporate bonds [Member]    
Securities available for sale:    
Amortized Cost 1,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
3,999us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair Value 865us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
3,598us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Unrealized Gain    44fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Unrealized (losses) (135)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(445)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Equities [Member]    
Securities available for sale:    
Amortized Cost 6,105us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
3,984us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value 6,138us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
4,011us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Unrealized Gain 46fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
40fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Unrealized (losses) (13)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(13)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
States and local governments [Member]    
Securities held to maturity:    
Amortized Cost 53,763us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
53,995us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Fair Value 57,550us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
56,700us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized Gain 3,787fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,709fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized (losses)    $ (4)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember