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Employee Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Total [Member] |  |
Fair value of plan assets | $ 37,282 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | $ 36,333 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 36,835 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 36,041 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets | 447 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 292 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fixed income investments - Money market funds [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 447 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 292 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Fixed income investments - Money market funds [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets |  |
Fixed income investments - Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets | 447 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 292 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fixed income investments - US government bond fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 3,385 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 3,257 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Fixed income investments - US government bond fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 3,385 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,257 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fixed income investments - US government bond fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Fixed income investments - US corporate bond fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 3,377 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 3,231 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Fixed income investments - US corporate bond fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 3,377 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,231 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fixed income investments - US corporate bond fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Fixed income investments - US corporate high yield bond fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 1,741 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 1,688 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Fixed income investments - US corporate high yield bond fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 1,741 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,688 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fixed income investments - US corporate high yield bond fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Large cap value fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 7,669 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 7,512 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Large cap value fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 7,669 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7,512 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Large cap value fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Large cap growth fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 7,694 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 7,740 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Large cap growth fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 7,694 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 7,740 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Large cap growth fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Small cap growth fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 3,162 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 3,142 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Small cap growth fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 3,162 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,142 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Small cap growth fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Mid cap growth fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 3,983 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 3,783 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Mid cap growth fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 3,983 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,783 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapGrowthFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Mid cap growth fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Foreign equity fund [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 3,611 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 3,696 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Foreign equity fund [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 3,611 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 3,696 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Foreign equity fund [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |
Equity investments - Company stock [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 2,213 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember | 1,992 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = fbp_FairValueInputsTotalMember
Equity investments - Company stock [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 2,213 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 1,992 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Equity investments - Company stock [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  |

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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