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Investment Securities Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 state security | Mar. 31, 2014 security | Dec. 31, 2014 security | Sep. 30, 2014 | Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Available-for-sale Securities Pledged as Collateral | $ 224,133us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 132,657us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | $ 164,919us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |  |
Number of securities temporarily impaired | 55fnlc_NumberOfSecuritiesTemporarilyImpaired | 268fnlc_NumberOfSecuritiesTemporarilyImpaired | 56fnlc_NumberOfSecuritiesTemporarilyImpaired |  |
Number of securities temporarily impaired | 5fnlc_NumberOfSecuritiesTemporarilyImpairedTwelveMonths | 73fnlc_NumberOfSecuritiesTemporarilyImpairedTwelveMonths | 36fnlc_NumberOfSecuritiesTemporarilyImpairedTwelveMonths |  |
Length of time securities temporarily impaired | 12 months | 12 months | 12 months |  |
Amortized cost of transferred securities from available-for-sale to held-to-maturity |  |  |  | 89,780fnlc_AvailableforSaleSecuritiesTransferredSecurityatCarryingValue |
Fair value of transferred securities from available-for-sale to held-to-maturity |  |  |  | 89,757fnlc_AvailableforSaleSecuritiesTransferredSecurityatFairValue |
Net unrealized loss, net of taxes on transferred securities |  |  |  | 15fnlc_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesAccumulatedUnrealizedGainLoss |
Other comprehensive income (loss), unrealized loss on transferred securities | 67fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | 0fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | 48fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity |  | 0fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity
Number of states in New England where FHLB serve | 6fnlc_NumberOfStatesInNewEnglandWhereFhlbServe |  |  |  |
Federal Home Loan Bank Stock | $ 12,875us-gaap_FederalHomeLoanBankStock | $ 12,875us-gaap_FederalHomeLoanBankStock | $ 12,875us-gaap_FederalHomeLoanBankStock |  |

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- Definition Available-for-Sale Securities, Transferred Security, at Carrying Value + References No definition available. + Details
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- Definition Available-for-Sale, Transferred Security, at Fair Value + References No definition available. + Details
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- Definition Available-for-sale Securities, Transferred to Held-to-maturity Securities, Accumulated Unrealized Gain (Loss) + References No definition available. + Details
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- Definition Length of time securities are temporarily impaired. + References No definition available. + Details
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- Definition The number of securities with unrealized losses, classified as temporarily impaired, held in a Company's portfolio as of the balance sheet date. + References No definition available. + Details
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- Definition The number of securities temporarily impaired as of the balance sheet date for a period of 12 months or more. + References No definition available. + Details
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- Definition The number of States in New England where Federal Home Loan Bank do housing and financing services. + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Accumulated Unrealized Gain (Loss) on Transfer of Available-for-sale Securities to Held-to-maturity + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5086-111524 + Details
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- Definition Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6478792&loc=d3e63345-112809 + Details
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