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Employee Benefit Plans, Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in Benefit Obligations [Roll Forward]      
Benefit obligation at beginning of year $ 1,479us-gaap_DefinedBenefitPlanBenefitObligation $ 1,954us-gaap_DefinedBenefitPlanBenefitObligation $ 1,848us-gaap_DefinedBenefitPlanBenefitObligation
Service cost 0us-gaap_DefinedBenefitPlanServiceCost 21us-gaap_DefinedBenefitPlanServiceCost 16us-gaap_DefinedBenefitPlanServiceCost
Interest cost 71us-gaap_DefinedBenefitPlanInterestCost 86us-gaap_DefinedBenefitPlanInterestCost 107us-gaap_DefinedBenefitPlanInterestCost
Benefits paid (100)us-gaap_DefinedBenefitPlanBenefitsPaid (107)us-gaap_DefinedBenefitPlanBenefitsPaid (103)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial (gain) loss 478fnlc_ActuarialGainLoss (475)fnlc_ActuarialGainLoss 86fnlc_ActuarialGainLoss
Benefit obligation at end of period 1,928us-gaap_DefinedBenefitPlanBenefitObligation 1,479us-gaap_DefinedBenefitPlanBenefitObligation 1,954us-gaap_DefinedBenefitPlanBenefitObligation
Funded Status of Plan [Abstract]      
Benefit obligation at end of period (1,928)us-gaap_DefinedBenefitPlanBenefitObligation (1,479)us-gaap_DefinedBenefitPlanBenefitObligation (1,954)us-gaap_DefinedBenefitPlanBenefitObligation
Unamortized (gain) loss 192fnlc_UnamortizedPriorServiceCost (289)fnlc_UnamortizedPriorServiceCost 186fnlc_UnamortizedPriorServiceCost
Unrecognized transition obligation 0fnlc_UnrecognizedTransitionObligation 0fnlc_UnrecognizedTransitionObligation 5fnlc_UnrecognizedTransitionObligation
Accrued benefit cost (1,736)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (1,768)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (1,763)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
Weighted average discount rate as of December 31 0.043fnlc_WeightedAverageDiscountRateAsOfDecember31 0.050fnlc_WeightedAverageDiscountRateAsOfDecember31 0.045fnlc_WeightedAverageDiscountRateAsOfDecember31
Components of Net Periodic Benefit Cost [Abstract]      
Service cost 0us-gaap_DefinedBenefitPlanServiceCost 21us-gaap_DefinedBenefitPlanServiceCost 16us-gaap_DefinedBenefitPlanServiceCost
Interest cost 71us-gaap_DefinedBenefitPlanInterestCost 86us-gaap_DefinedBenefitPlanInterestCost 107us-gaap_DefinedBenefitPlanInterestCost
Amortization of unrecognized transition obligation 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets 5us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets 29us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
Amortization of gain (12)fnlc_DefinedBenefitPlanAmortizationofGain 0fnlc_DefinedBenefitPlanAmortizationofGain 0fnlc_DefinedBenefitPlanAmortizationofGain
Other settlement expense 10us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 0us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 0us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic benefit cost $ 69us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 112us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 152us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Weighted average discount rate for net periodic cost 0.050fnlc_WeightedAverageDiscountRateForNetPeriodicCost 0.045fnlc_WeightedAverageDiscountRateForNetPeriodicCost 0.065fnlc_WeightedAverageDiscountRateForNetPeriodicCost