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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI - SERP) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net gain (loss) arising during period $ (5,171)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax $ 8,765us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax $ 13,975us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
SERP [Member]      
Accumulated other comprehensive loss at beginning of fiscal year 949us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
(120)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
 
Net gain (loss) arising during period 265us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
1,856us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
 
Prior service cost        
Amortization of unrecognized actuarial loss (221)fbp_AmortizationOfUnrecognizedActuarialLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
(101)fbp_AmortizationOfUnrecognizedActuarialLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
 
Amortization of prior service cost and transition obligation        
Tax expense related to changes during the year, net (17)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
(686)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
 
Accumulated other comprehensive gain (loss) at end of fiscal year $ 976us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember
$ 949us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fbp_SerpPlanCurrentYearMember