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Certificates of Deposit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Certificates of deposit by balance [Abstract]
Certificates of deposit less than $100,000	$ 184,471us-gaap_TimeDepositsLessThan100000	$ 210,321us-gaap_TimeDepositsLessThan100000
Certificates $100,000 to $250,000	221,892fnlc_TimeDepositsGreaterThan100000AndLessThan250000	278,674fnlc_TimeDepositsGreaterThan100000AndLessThan250000
Certificates $250,000 and over	41,138fnlc_TimeDeposits250000OrMore	42,124fnlc_TimeDeposits250000OrMore
Total	447,501us-gaap_TimeDeposits	531,119us-gaap_TimeDeposits
Maturity of certificates of deposit [Abstract]
2015	340,449us-gaap_TimeDepositMaturitiesYearOne
2016	35,322us-gaap_TimeDepositMaturitiesYearTwo
2017	16,434us-gaap_TimeDepositMaturitiesYearThree
2018	21,636us-gaap_TimeDepositMaturitiesYearFour
2019	32,890us-gaap_TimeDepositMaturitiesYearFive
2020 and thereafter	770us-gaap_TimeDepositMaturitiesAfterYearFive
Total	447,501us-gaap_TimeDeposits	531,119us-gaap_TimeDeposits
Interest expense on certificates of deposit of $100,000 or greater	2,823us-gaap_InterestExpenseTimeDeposits100000OrMore	3,280us-gaap_InterestExpenseTimeDeposits100000OrMore	3,358us-gaap_InterestExpenseTimeDeposits100000OrMore
Less Than $100,000
Certificates of deposit by balance [Abstract]
Total	184,471us-gaap_TimeDeposits / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
Maturity of certificates of deposit [Abstract]
2015	134,198us-gaap_TimeDepositMaturitiesYearOne / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
2016	19,757us-gaap_TimeDepositMaturitiesYearTwo / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
2017	8,261us-gaap_TimeDepositMaturitiesYearThree / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
2018	7,476us-gaap_TimeDepositMaturitiesYearFour / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
2019	14,514us-gaap_TimeDepositMaturitiesYearFive / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
2020 and thereafter	265us-gaap_TimeDepositMaturitiesAfterYearFive / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
Total	184,471us-gaap_TimeDeposits / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_LessThan100000Member
Greater Than $100,000 But Less Than $250,000
Certificates of deposit by balance [Abstract]
Total	263,030us-gaap_TimeDeposits / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
Maturity of certificates of deposit [Abstract]
2015	206,251us-gaap_TimeDepositMaturitiesYearOne / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
2016	15,565us-gaap_TimeDepositMaturitiesYearTwo / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
2017	8,173us-gaap_TimeDepositMaturitiesYearThree / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
2018	14,160us-gaap_TimeDepositMaturitiesYearFour / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
2019	18,376us-gaap_TimeDepositMaturitiesYearFive / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
2020 and thereafter	505us-gaap_TimeDepositMaturitiesAfterYearFive / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member
Total	$ 263,030us-gaap_TimeDeposits / fnlc_MaturitiesOfCertificatesOfDepositsByBalanceAxis = fnlc_GreaterThan100000ButLessThan250000Member

X

- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $250,000.

+ References

No definition available.

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- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $100,000 but less than $250,000.

+ References

No definition available.

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- Definition

Interest expense incurred on time deposits, including certificates of deposits, of $100,000 or more in domestic offices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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- Definition

Amount of time deposits maturing after the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the fourth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the next fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the third fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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- Definition

Amount of time deposits maturing in the second fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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X

- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.12)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9

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- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000.

+ References

No definition available.

+ Details

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