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Other Comprehensive Income (Loss) - Reclassification of Available-for-Sale Securities to Held-to-Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward] |  |
Balance at beginning of period | $ (48)fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity
Net unrealized losses transferred during the period | 0fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturitybeforeTax | 0fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturitybeforeTax
Amortization of net unrealized losses | (14)fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity | 0fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity
Related deferred taxes | (5)fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtoMaturityTax | 0fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtoMaturityTax
Net change | (19)fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturityNetofTax | 0fnlc_OtherComprehensiveIncomeLossTransfersfromAvailableforSaleSecuritiestoHeldtomaturityNetofTax
Balance at end of period | $ (67)fnlc_OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity | $ 0fnlc_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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Balance Type: | credit
Period Type: | instant

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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
Name: | fnlc_OtherComprehensiveIncomeLossAmortizationofNetUnrealizedLossesonTransfersofAvailableforSalesecuritiestoHeldtoMaturity
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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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Namespace Prefix: | fnlc_
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- Details
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