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Acquisitions and Intangible Assets - Schedule of Future Amortization Expense (Details) (Bank Acquisition From Camden National Bank, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Bank Acquisition From Camden National Bank
Future amortization expense of core deposits acquired [Abstract]
2015	$ 57us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
2016	43us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
2017	43us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
2018	43us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
2019	43us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
Thereafter	131us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember
Total	$ 360us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember

X

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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