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Acquisitions and Intangible Assets (Details) (USD $) | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Oct. 26, 2012 | Dec. 31, 2013 | Jan. 14, 2005
Business Acquisition [Line Items] |  |  |  |
Core deposit intangible |  | 432,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |
Goodwill |  | 2,121,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount |  |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss |  |  |
Goodwill | 29,805,000 us-gaap_Goodwill |  | 29,805,000 us-gaap_Goodwill |
Bank Acquisitions From Camden National Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination Recognized Liabilities Assumed Deposits |  | 32,300,000 fnlc_BusinessCombinationRecognizedLiabilitiesAssumedDeposits / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |
Business combination purchase premium |  | 2,553,000 fnlc_BusinessCombinationPurchasePremium / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |
Future amortization expense of core deposits acquired [Abstract] |  |  |  |
2015 | 57,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
2016 | 43,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
2017 | 43,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
2018 | 43,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
2019 | 43,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
Thereafter | 131,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
Total | 360,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember |  |  |
Bank Acquisition From Camden National Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  | 10 years |  |
FNB Bankshares |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  |  | 27,559,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember
One time acquisition costs |  |  |  | 47,955,000 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember
Acquisition in 2001 |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 125,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_AcquisitionIn2001Member |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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