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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
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Change in Benefit Obligations [Roll Forward] |  |  |
Benefit obligation at beginning of year | $ 1,479 us-gaap_DefinedBenefitPlanBenefitObligation | $ 1,954 us-gaap_DefinedBenefitPlanBenefitObligation | $ 1,848 us-gaap_DefinedBenefitPlanBenefitObligation
Service cost | 0 us-gaap_DefinedBenefitPlanServiceCost | 21 us-gaap_DefinedBenefitPlanServiceCost | 16 us-gaap_DefinedBenefitPlanServiceCost
Interest cost | 71 us-gaap_DefinedBenefitPlanInterestCost | 86 us-gaap_DefinedBenefitPlanInterestCost | 107 us-gaap_DefinedBenefitPlanInterestCost
Benefits paid | (100)us-gaap_DefinedBenefitPlanBenefitsPaid | (107)us-gaap_DefinedBenefitPlanBenefitsPaid | (103)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial (gain) loss | 478 fnlc_ActuarialGainLoss | (475)fnlc_ActuarialGainLoss | 86 fnlc_ActuarialGainLoss
Benefit obligation at end of period | 1,928 us-gaap_DefinedBenefitPlanBenefitObligation | 1,479 us-gaap_DefinedBenefitPlanBenefitObligation | 1,954 us-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 | 192 fnlc_UnamortizedPriorServiceCost | (289)fnlc_UnamortizedPriorServiceCost | 186 fnlc_UnamortizedPriorServiceCost
Unrecognized transition obligation | 0 fnlc_UnrecognizedTransitionObligation | 0 fnlc_UnrecognizedTransitionObligation | 5 fnlc_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 | 0.043 fnlc_WeightedAverageDiscountRateAsOfDecember31 | 0.050 fnlc_WeightedAverageDiscountRateAsOfDecember31 | 0.045 fnlc_WeightedAverageDiscountRateAsOfDecember31
Components of Net Periodic Benefit Cost [Abstract] |  |  |
Service cost | 0 us-gaap_DefinedBenefitPlanServiceCost | 21 us-gaap_DefinedBenefitPlanServiceCost | 16 us-gaap_DefinedBenefitPlanServiceCost
Interest cost | 71 us-gaap_DefinedBenefitPlanInterestCost | 86 us-gaap_DefinedBenefitPlanInterestCost | 107 us-gaap_DefinedBenefitPlanInterestCost
Amortization of unrecognized transition obligation | 0 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets | 5 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets | 29 us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets
Amortization of gain | (12)fnlc_DefinedBenefitPlanAmortizationofGain | 0 fnlc_DefinedBenefitPlanAmortizationofGain | 0 fnlc_DefinedBenefitPlanAmortizationofGain
Other settlement expense | 10 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses | 0 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses | 0 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic benefit cost | $ 69 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | $ 112 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | $ 152 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Weighted average discount rate for net periodic cost | 0.050 fnlc_WeightedAverageDiscountRateForNetPeriodicCost | 0.045 fnlc_WeightedAverageDiscountRateForNetPeriodicCost | 0.065 fnlc_WeightedAverageDiscountRateForNetPeriodicCost

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- Definition Unrecognized transition obligation + References No definition available. + Details
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- Definition Weighted average discount rate. + References No definition available. + Details
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- Definition Weighted average discount rate for net periodic cost + References No definition available. + Details
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- Definition The amount of gains or losses recognized in net periodic benefit cost. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of the transition obligation or asset recognized in net periodic benefit cost. + 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 (h)(6) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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 (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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