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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
	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

X

- 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.

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