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Employee Benefit Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
employee
post_retirement_benefit_plan
Mar. 31, 2014
Dec. 31, 2014
General Discussion of Pension and Other Postretirement Benefits [Abstract]      
Requisite period of service 3 months    
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution (in hundredths) 3.00%fnlc_DefinedContributionPlanEmployerMaximumPercentageMatchOfEmployeeAnnualSalary    
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee (in hundredths)     2.00%fnlc_DefinedContributionPlanEmployerMaximumProfitSharingContributions
Expense related to 401(k) plan $ 121,000us-gaap_DefinedContributionPlanCostRecognized $ 116,000us-gaap_DefinedContributionPlanCostRecognized  
Post Employment Plan, Period of Non-qualified Compensation Payable 2 years    
Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death 20 years    
Pension expense 78,000us-gaap_PensionAndOtherPostretirementBenefitExpense 94,000us-gaap_PensionAndOtherPostretirementBenefitExpense  
Accrued pension liability 3,031,000us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities 2,413,000us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities 2,999,000us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities
Number of post retirement benefit plans 2fnlc_NumberOfPostRetirementBenefitPlans    
Number of employees currently eligible 7fnlc_NumberOfEmployeesCurrentlyEligibleUnderPostRetirementPlan    
Requisite age 50 years    
Post-retirement benefit plan health insurance subsidy range minimum per month per person 40fnlc_PostRetirementBenefitPlanHealthInsuranceSubsidyRangeMinimum    
Post-retirement benefit plan health insurance subsidy range maximum per month per person 1,200fnlc_PostRetirementBenefitPlanHealthInsuranceSubsidyRangeMaximum    
Discount rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate    
Assumed health care cost trend rate (in hundredths) 7.00%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear    
Expected future benefit payments, next quarter 30,000fnlc_ExpectedFutureBenefitPaymentsNextQuarter    
Expected future benefit payments, current year 120,000fnlc_ExpectedFutureBenefitPaymentsCurrentYear    
Estimated plan expense 80,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear    
Effect of one percentage point increase on accumulated benefit obligation 100,000us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation    
Effect of One Percentage Point Increase on Interest Cost Components 7,000fnlc_EffectOfOnePercentagePointIncreaseOnInterestCostComponents    
Effect of One Percentage Point Increase on Service Cost Components $ 1,000fnlc_EffectOfOnePercentagePointIncreaseOnServiceCostComponents