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Earnings Per Share - Schedule of Options and Warrants Outstanding (Details)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Schedule of Outstanding Options And Warrants [Line Items]
Incentive stock options (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	42,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	42,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Warrants issued to U.S. Treasury (in shares)	225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights		225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Total dilutive securities (in shares)	225,904fnlc_EarningsPerShareTotalDilutiveSecurities		267,904fnlc_EarningsPerShareTotalDilutiveSecurities
In-the-Money
Schedule of Outstanding Options And Warrants [Line Items]
Incentive stock options (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember		0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Warrants issued to U.S. Treasury (in shares)	225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember		0us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Total dilutive securities (in shares)	225,904fnlc_EarningsPerShareTotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember		0fnlc_EarningsPerShareTotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Out-of-the-Money
Schedule of Outstanding Options And Warrants [Line Items]
Incentive stock options (in shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember		42,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember
Warrants issued to U.S. Treasury (in shares)	0us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember		225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember
Total dilutive securities (in shares)	0fnlc_EarningsPerShareTotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember		267,904fnlc_EarningsPerShareTotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember

X

- Definition

The total number of shares reserved for issuance under stock option and warrants and are outstanding as of the balance sheet date.

+ References

No definition available.

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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(i)(2))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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X

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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