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Loans - Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015 loan	Mar. 31, 2014 loan	Dec. 31, 2014 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Number of Contracts	90us-gaap_FinancingReceivableModificationsNumberOfContracts2	101us-gaap_FinancingReceivableModificationsNumberOfContracts2	94us-gaap_FinancingReceivableModificationsNumberOfContracts2
Financing Receivable, Modifications, Recorded Investment	$ 26,524us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 28,796us-gaap_FinancingReceivableModificationsRecordedInvestment	$ 27,214us-gaap_FinancingReceivableModificationsRecordedInvestment
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months	8fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months	13fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months
Financing Receivable Recorded Investment Greater Than30 Days Past Due	1,121fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue	1,915fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Had Been Placed On TDR Status In Previous 12 Months		2fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatHadBeenPlacedOnTdrStatusInPrevious12Months
Loans classified as TDR in last 12 months		301fnlc_FinancingReceivableLoansClassifiedasTroubledDebtRestructuringsThatHadBeenPlacedonTDRStatusinPrevious12Months
Financing Receivable Modifications Number Of Contracts During Period	0fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod	3fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Financing Receivable Modifications Post Modification Recorded Investment During Period		293fnlc_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy	9fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy
Financing Receivable, Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy	1,206fnlc_FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy
Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status	14fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatWereOnNonAccrualStatus
Financing Receivable, Number of Loans Classified As Troubled Debt Restructurings Classified As NonAccrual	2,019fnlc_FinancingReceivableNumberofLoansClassifiedAsTroubledDebtRestructuringsClassifiedAsNonAccrual
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure	4fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsInvolvedInForeclosure
Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure	472fnlc_LoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInForeclosure
Mortgage Loans in Process of Foreclosure, Number	16fnlc_MortgageLoansinProcessofForeclosureNumber
Mortgage Loans in Process of Foreclosure, Amount	$ 1,677us-gaap_MortgageLoansInProcessOfForeclosureAmount
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Days Past Due	30 days	30 days

X

- Definition

Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Carrying amount of loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months.

+ References

No definition available.

+ Details

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- Definition

The number of financing receivables that have been modified by troubled debt restructurings during the current period.

+ References

No definition available.

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- Definition

The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months.

+ References

No definition available.

+ Details

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings after the financing receivable has been modified during the current period.

+ References

No definition available.

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- Definition

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- Definition

Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure

+ References

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- Definition

The number of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.

+ References

No definition available.

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- Definition

The number of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 months.

+ References

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- Definition

The number of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date.

+ References

No definition available.

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- Definition

Financing receivables that are greater than 30 days past due.

+ References

No definition available.

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- Definition

Loans classified as troubled debt restructurings that are involved in foreclosure as of the balance sheet date.

+ References

No definition available.

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- Definition

Mortgage Loans in Process of Foreclosure, Number

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Number Of Days Past Due

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

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- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 35

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL49126937-111524

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