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Stock Options and Stock-Based Compensation Stock Options and Stock-Based Compensation Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 1995	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period	86,336us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Total share based compensation cost	$ 1,079fnlc_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostRecognizedAndNotYetRecognized
Allocated Share-based Compensation Expense	74us-gaap_AllocatedShareBasedCompensationExpense	102us-gaap_AllocatedShareBasedCompensationExpense
Share-based compensation expense not yet recognized	$ 567us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	$ 741us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Shares granted, net of forfeitures (shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod		600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Percentage of options vesting two years	50.00%fnlc_PercentageOfOptionsVestingTwoYears
Percentage of options vesting five years	50.00%fnlc_PercentageOfOptionsVestingFiveYears
Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (shares)				400,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = fnlc_Plan2010Member
First Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Second Vesting Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	5 years
Restricted Stock | Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period	66,644us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = fnlc_Plan2010Member
Restricted Stock | First Vesting Period | Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period	2,156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_PlanNameAxis = fnlc_Plan2010Member / us-gaap_VestingAxis = fnlc_PeriodOneMember
Vesting Term (In Years)	1 year

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- Definition

Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Recognized And Not yet Recognized

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- Definition

The percentage of options vesting five years to total option plan as of the balance sheet date if other than 100 percent.

+ References

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- Definition

The percentage of options vesting two years to total option plan as of the balance sheet date if other than 100 percent.

+ References

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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Aggregate number of common shares reserved for future issuance.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Unrecognized cost of unvested share-based compensation awards.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Net number of share options (or share units) granted during the period.

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