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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income (Numerator) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income as reported | $ 3,426 us-gaap_NetIncomeLoss | $ 4,108 us-gaap_NetIncomeLoss | $ 3,747 us-gaap_NetIncomeLoss | $ 3,428 us-gaap_NetIncomeLoss | $ 3,502 us-gaap_NetIncomeLoss | $ 3,365 us-gaap_NetIncomeLoss | $ 3,242 us-gaap_NetIncomeLoss | $ 2,856 us-gaap_NetIncomeLoss | $ 14,709 us-gaap_NetIncomeLoss | $ 12,965 us-gaap_NetIncomeLoss | $ 12,688 us-gaap_NetIncomeLoss
Less dividends and amortization of premium on preferred stock |  |  |  |  |  |  |  |  | 0 fnlc_LessDividendsAndAmortizationOfPremiumOnPreferredStock | 384 fnlc_LessDividendsAndAmortizationOfPremiumOnPreferredStock | 723 fnlc_LessDividendsAndAmortizationOfPremiumOnPreferredStock
Basic EPS: Income available to common shareholders |  |  |  |  |  |  |  |  | 14,709 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 12,581 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 11,965 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Diluted EPS: Income available to common shareholders plus assumed conversions |  |  |  |  |  |  |  |  | $ 14,709 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 12,581 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 11,965 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares (Denominator) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  |  |  |  |  |  |  | 10,638,527 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 10,469,446 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 9,828,925 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Incremental shares |  |  |  |  |  |  |  |  | 72,337 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 51,609 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 17,606 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares) |  |  |  |  |  |  |  |  | 10,710,864 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 10,521,055 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 9,846,531 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per-Share Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic EPS: Income available to common shareholders (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.35 us-gaap_EarningsPerShareBasic | $ 0.32 us-gaap_EarningsPerShareBasic | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.31 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 1.38 us-gaap_EarningsPerShareBasic | $ 1.20 us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.35 us-gaap_EarningsPerShareDiluted | $ 0.32 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.31 us-gaap_EarningsPerShareDiluted | $ 0.29 us-gaap_EarningsPerShareDiluted | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 1.37 us-gaap_EarningsPerShareDiluted | $ 1.20 us-gaap_EarningsPerShareDiluted | $ 1.22 us-gaap_EarningsPerShareDiluted
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |  |  | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Warrants issued to U.S. Treasury | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Total Dilutive Securities | 267,904 fnlc_TotalDilutiveSecurities |  |  |  | 267,904 fnlc_TotalDilutiveSecurities |  |  |  | 267,904 fnlc_TotalDilutiveSecurities | 267,904 fnlc_TotalDilutiveSecurities | 267,904 fnlc_TotalDilutiveSecurities
In-the-Money |  |  |  |  |  |  |  |  |  |  |
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Warrants issued to U.S. Treasury | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 0 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Total Dilutive Securities | 225,904 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 225,904 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember |  |  |  | 225,904 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 225,904 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember | 0 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_InMoneyMember
Out-of-the-Money |  |  |  |  |  |  |  |  |  |  |
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 42,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember
Warrants issued to U.S. Treasury | 0 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 0 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 0 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 0 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember
Total Dilutive Securities | 42,000 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 42,000 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember |  |  |  | 42,000 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 42,000 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember | 267,904 fnlc_TotalDilutiveSecurities / fnlc_PriceLevelOfOptionsAndWarrantsAxis = fnlc_OutOfMoneyMember

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