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Employee Benefit Plans (Schedule of Investment Category Benchmarks) (Details)	12 Months Ended
	Dec. 31, 2014
Fixed income investments - Cash/money market account [Member]
Investment Category Benchmark	Citigroup Treasury Bill Index – 3 month
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Range of acceptable deviation from investment category benchmark, maximum	0.50%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember
Fixed income investments - US government bond fund [Member]
Investment Category Benchmark	Barclays Intermediate Government Bond Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember
Range of acceptable deviation from investment category benchmark, maximum	2.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsGovernmentBondFundMember
Fixed income investments - US corporate bond fund [Member]
Investment Category Benchmark	Barclays Aggregate Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember
Range of acceptable deviation from investment category benchmark, maximum	2.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateBondFundMember
Fixed income investments - US corporate high yield bond fund [Member]
Investment Category Benchmark	Barclays High Yield Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember
Range of acceptable deviation from investment category benchmark, maximum	2.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_UsCorporateHighYieldBondFundMember
Equity investments - Large cap value fund [Member]
Investment Category Benchmark	Russell 1000 Value Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapValueFundMember
Equity investments - Large cap growth fund [Member]
Investment Category Benchmark	Russell 1000 Growth Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_LargeCapGrowthFundMember
Equity investments - Mid cap equity fund [Member]
Investment Category Benchmark	Russell Mid Cap Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapEquityFundMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_MidCapEquityFundMember
Equity investments - Small cap growth fund [Member]
Investment Category Benchmark	Russell 2000 Growth Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_SmallCapGrowthFundMember
Equity investments - Foreign equity fund [Member]
Investment Category Benchmark	MSCI EAFE Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_ForeignEquityFundMember
Equity investments - Company stock [Member]
Investment Category Benchmark	Russell 2000 Index
Range of acceptable deviation from investment category benchmark, minimum	0.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember
Range of acceptable deviation from investment category benchmark, maximum	3.00%fbp_RangeOfAcceptableDeviationFromInvestmentCategoryBenchmarkMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = fbp_CompanyStockMember

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- Definition

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+ References

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- Definition

The maximum range of acceptable deviation from the investment category benchmark.

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- Definition

The minimum range of acceptable deviation from the investment category benchmark.

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