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Summary of Significant Accounting Policies (Schedule of Changes in Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrealized Gain (Loss) on Securities Available for Sale
Beginning balance at January 1, 2013	$ (1,232)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	$ 2,007us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income (loss) before reclassifications	1,290us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax	(2,914)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Amounts reclassified from accumulated other comprehensive income	(479)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(325)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net current-period other comprehensive income (loss)	811us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(3,239)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Ending balance at December 31, 2013	(421)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(1,232)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2,007us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Additional Pension Asset (Liability)
Beginning balance at January 1, 2013	3,132us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax	(2,183)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax
Other comprehensive income (loss) before reclassifications	(3,154)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax	5,346us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Amounts reclassified from accumulated other comprehensive income	(135)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax	(31)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Net current-period other comprehensive income (loss)	(3,289)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	5,315us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Ending balance at December 31, 2013	(157)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax	3,132us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax	(2,183)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax
Total
Beginning balance at January 1, 2013	1,900us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	(176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other comprehensive income (loss) before reclassifications	(1,864)fbp_OtherComprehensiveIncomeLossAdjustmentBeforeReclassificationAdjustmentsNetOfTax	2,432fbp_OtherComprehensiveIncomeLossAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Amounts reclassified from accumulated other comprehensive income	(614)fbp_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCINetOfTax	(356)fbp_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCINetOfTax
Net current-period other comprehensive income (loss)	(2,478)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2,076us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	8,506us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending balance at December 31, 2013	$ (578)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 1,900us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ (176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax

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