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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
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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 | $ 2,007 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |
Other comprehensive income (loss) before reclassifications | 1,290 us-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) | 811 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (3,239)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent |
Ending balance at December 31, 2013 | (421)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (1,232)us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 2,007 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Additional Pension Asset (Liability) |  |  |
Beginning balance at January 1, 2013 | 3,132 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax | (2,183)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax |
Other comprehensive income (loss) before reclassifications | (3,154)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsNetOfTax | 5,346 us-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 | 5,315 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |
Ending balance at December 31, 2013 | (157)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax | 3,132 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax | (2,183)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeMinimumPensionLiabilityAfterTax
Total |  |  |
Beginning balance at January 1, 2013 | 1,900 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Other comprehensive income (loss) before reclassifications | (1,864)fbp_OtherComprehensiveIncomeLossAdjustmentBeforeReclassificationAdjustmentsNetOfTax | 2,432 fbp_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 | 2,076 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent | 8,506 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Ending balance at December 31, 2013 | $ (578)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ 1,900 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | $ (176)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax

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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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