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Acquisitions and Intangible Assets - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Oct. 26, 2012 | Jan. 14, 2005 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  | $ 29,805us-gaap_Goodwill | $ 29,805us-gaap_Goodwill | $ 29,805us-gaap_Goodwill
Bank Acquisition From Camden National Bank |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Deposits and loans acquired | 32,300fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsDepositsAndLoans / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember |  |  |  |
Price premium | 2,553fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedConsiderationPaidInExcessOfIdentifiableFairValueOfAssetsAndLiabilities / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember |  |  |  |
Core deposit intangible | 432fnlc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFiniteLivedIntangibles / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |
Goodwill | 2,121us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionFromCamdenNationalBankMember |  |  |  |
FNB Bankshares |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | 27,559us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember |  |  |
Total value of consideration |  | 47,955us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember |  |  |
Acquisition In 2011 |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  |  |  | $ 125us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fnlc_AcquisitionIn2011Member |

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Consideration Paid In Excess Of Identifiable Carrying Value Of Assets And Liabilities + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Deposits And Loans + References No definition available. + Details
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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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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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