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Other Comprehensive Income (Loss), Summary of Transfer of AFS Securities to HTM (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |
Balance at beginning of period | $ 0 fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0 fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0 fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity
Net unrealized losses transferred during the period | (23)fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturitybeforeTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturitybeforeTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturitybeforeTax
Amortization of net unrealized losses | (51)fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity | 0 fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity | 0 fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity
Related deferred taxes | 26 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtoMaturityTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtoMaturityTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtoMaturityTax
Net change | (48)fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturityNetofTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturityNetofTax | 0 fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturityNetofTax
Balance at end of period | $ (48)fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0 fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0 fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity

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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 Other Comprehensive Income (Loss), Amortization of Net Unrealized Losses on Transfers of Available-for-Sale securities to Held-to-Maturity + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Transfers from Available-for-Sale Securities to Held-to-maturity, before Tax + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Transfers from Available-for-Sale Securities to Held-to-maturity, Net of Tax + References No definition available. + Details
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- Definition Other Comprehensive Income (Loss), Transfers from Available-for-Sale Securities to Held-to-Maturity, Tax + References No definition available. + Details
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- Details
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