| **Employee Benefit Plans (Details) (USD $)**                                                                                                | 3 Months Ended                                                                                                  |                                                                           |
|---------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------|
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| **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                                           |                                                                      |   |

| X                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The highest percentage of employer match of employee contribution to defined contribution plan based on annual salary.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Percentage of profit-sharing contributed by the employer to the defined contribution plan. The employee is entitled to receive in the future, subject to vesting and other restrictions, a share in the profits, as defined in the agreement, of the entity or portion thereof. Employer contributions may be discretionary or may be based on a fixed formula related to profits, compensation, or other factors. It is a form of incentive compensation to employees in addition to their regular salary and bonuses.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the interest cost components of net periodic postretirement health care benefit costs.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service cost components of net periodic postretirement health care benefit costs.
+ References
No definition available.
+ Details**Name:**fnlc_EffectOfOnePercentagePointIncreaseOnServiceCostComponents**Namespace Prefix:**fnlc_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                      |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Employee Benefit Plan, Requisite Minimum Age
+ References
No definition available.
+ Details**Name:**fnlc_EmployeeBenefitPlanRequisiteMinimumAge**Namespace Prefix:**fnlc_**Data Type:**xbrli:durationItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                             |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the benefits expected to be paid during the year.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the benefits expected to be paid next quarter during the current year.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number Of Employees Currently Eligible Under Post Retirement Plan
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of post-retirement benefit plans sponsored by the company.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Post Employment Plan, Period of Non-qualified Compensation Payable
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Post Employment Plan, Supplemental Benefits, Payment Period Upon Retirement Or Death
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The maximum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                         |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The minimum amount employer will contribute per month to post-retiree for subsidizing the cost of health care insurance.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This represents the entire liability recognized in the balance sheet that is associated with the defined benefit pension plans.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The interest rate used to adjust for the time value of money for the plan.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of the cost recognized during the period for defined contribution plans.
+ References
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| X                                                                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).
+ References
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