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Acquisitions and Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Oct. 26, 2012	Jan. 14, 2005	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Goodwill			$ 29,805us-gaap_Goodwill	$ 29,805us-gaap_Goodwill	$ 29,805us-gaap_Goodwill
Bank Acquisition From Camden National Bank
Business Acquisition [Line Items]
Deposits and loans acquired	32,300fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsDepositsAndLoans / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
Price premium	2,553fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConsiderationPaidInExcessOfIdentifiableFairValueOfAssetsAndLiabilities / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
Core deposit intangible	432fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibles / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Goodwill	2,121us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
FNB Bankshares
Business Acquisition [Line Items]
Goodwill		27,559us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember
Total value of consideration		47,955us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember
Acquisition In 2011
Business Acquisition [Line Items]
Goodwill				$ 125us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_AcquisitionIn2011Member

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Consideration Paid In Excess Of Identifiable Carrying Value Of Assets And Liabilities

+ References

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+ References

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- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Deposits And Loans

+ References

No definition available.

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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

-Publisher FASB

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-Topic 805

-SubTopic 30

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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