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Earnings Per Share - Schedule of Options and Warrants Outstanding (Details) | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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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

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- 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. + Details
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- 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 + Details
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- 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 + Details
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- Details
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