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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |
Finite lived intangible asset, amortization (in years) | 10 years |  |
Amortization of identified intangibles | $ 326 us-gaap_AmortizationOfIntangibleAssets | $ 326 us-gaap_AmortizationOfIntangibleAssets | $ 283 us-gaap_AmortizationOfIntangibleAssets
Bank Acquisitions From Camden National Bank | Core Deposits |  |  |
Business Acquisition [Line Items] |  |  |
Finite lived intangible asset, amortization (in years) | 10 years |  |
Amortization of identified intangibles | 43 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 43,000 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Amortization of Intangible Assets, Yearly Expense till Fully Amortized | 43 fnlc_AmortizationofIntangibleAssetsYearlyExpensetillFullyAmortized / us-gaap_BusinessAcquisitionAxis = fnlc_BankAcquisitionsFromCamdenNationalBankMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |
FNB Bankshares | Core Deposits |  |  |
Business Acquisition [Line Items] |  |  |
Amortization of identified intangibles | 283 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 283 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 283 us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization of Intangible Assets - FNB Bankshares | $ 14 fnlc_AmortizationofIntangibleAssetsFNBBankshares / us-gaap_BusinessAcquisitionAxis = fnlc_FnbBanksharesMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |

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- Definition Amortization of Intangible Assets - FNB Bankshares + References No definition available. + Details
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- Definition Amortization of Intangible Assets, Yearly Expense till Fully Amortized + 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 The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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