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Securities (Summary of Book Values and Fair Values of Investment Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Securities available for sale:      
Amortized Cost $ 178,633us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 164,724us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Fair Value 178,190us-gaap_AvailableForSaleSecurities 164,034us-gaap_AvailableForSaleSecurities 180,190us-gaap_AvailableForSaleSecurities
Unrealized Gain 906fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime 830fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime  
Unrealized (Losses) (1,349)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime (1,520)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime  
Securities held to maturity:      
Amortized Cost 170,804us-gaap_HeldToMaturitySecurities 178,687us-gaap_HeldToMaturitySecurities 53,937us-gaap_HeldToMaturitySecurities
Fair Value 174,756us-gaap_HeldToMaturitySecuritiesFairValue 182,411us-gaap_HeldToMaturitySecuritiesFairValue 57,192us-gaap_HeldToMaturitySecuritiesFairValue
Unrealized Gain 4,081fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime 3,832fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime  
Unrealized (Losses) (129)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime (108)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime  
US Government-sponsored enterprises securities [Member]      
Securities available for sale:      
Amortized Cost 44,291us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
27,546us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Fair Value 44,365us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
27,521us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Unrealized Gain 97fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
33fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Unrealized (Losses) (23)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
(58)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
 
Mortgage-backed securities [Member]      
Securities available for sale:      
Amortized Cost 127,382us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
130,073us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fair Value 126,930us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
129,510us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Unrealized Gain 761fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
751fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Unrealized (Losses) (1,213)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(1,314)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Securities held to maturity:      
Amortized Cost 118,399us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
124,924us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Fair Value 118,385us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
124,861us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Unrealized Gain 115fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
45fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
 
Unrealized (Losses) (129)fbp_HeldtoMaturitySecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
(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
1,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Fair Value 900us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
865us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Unrealized Gain        
Unrealized (Losses) (100)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(135)fbp_AvailableforsaleSecuritiesGrossUnrealizedLossesPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Equities [Member]      
Securities available for sale:      
Amortized Cost 5,960us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
6,105us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Fair Value 5,995us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
6,138us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
 
Unrealized Gain 48fbp_AvailableforsaleSecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
46fbp_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 52,405us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
53,763us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Fair Value 56,371us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
57,550us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Unrealized Gain 3,966fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3,787fbp_HeldtoMaturitySecuritiesGrossUnrealizedGainsPointinTime
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
Unrealized (Losses)