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Summary of Significant Accounting Policies (Schedule of Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies [Abstract]      
Unrealized gain (loss) on securities available for sale $ (691)fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleBeforeTax $ (2,021)fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleBeforeTax $ 3,290fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleBeforeTax
Deferred tax asset (liability) 270fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleTax 789fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleTax (1,283)fbp_AccumulatedOtherComprehensiveIncomeLossUnrealizedGainLossOnSecuritiesAvailableForSaleTax
Net unrealized gain (loss) on securities available for sale (421)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (1,232)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 2,007us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Additional pension asset (liability) (257)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityBeforeTax 5,135us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityBeforeTax (3,579)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityBeforeTax
Deferred tax asset (liability) 100fbp_AccumulatedOtherComprehensiveIncomeLossPensionLiabilityTax (2,003)fbp_AccumulatedOtherComprehensiveIncomeLossPensionLiabilityTax 1,396fbp_AccumulatedOtherComprehensiveIncomeLossPensionLiabilityTax
Net additional pension asset (liability) (157)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax 3,132us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax (2,183)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax
Total accumulated other comprehensive income (loss) $ (578)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ 1,900us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax