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Mortgage Servicing Rights Included in Other Assets (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Transfers and Servicing [Abstract] |  |  |
Mortgage servicing rights | $ 6,103fnlc_MortgageServicingRightsGross | $ 6,039fnlc_MortgageServicingRightsGross | $ 7,240fnlc_MortgageServicingRightsGross
Accumulated amortization | (5,053)fnlc_AccumulatedAmortizationMortgageServicingRights | (4,949)fnlc_AccumulatedAmortizationMortgageServicingRights | (6,098)fnlc_AccumulatedAmortizationMortgageServicingRights
Impairment reserve | (47)fnlc_ReserveForImpairmentOfMortgageServicingRights | (4)fnlc_ReserveForImpairmentOfMortgageServicingRights | (13)fnlc_ReserveForImpairmentOfMortgageServicingRights
Total Servicing asset at fair value | $ 1,003us-gaap_ServicingAssetAtAmortizedValueFairValue | $ 1,086us-gaap_ServicingAssetAtAmortizedValueFairValue | $ 1,129us-gaap_ServicingAssetAtAmortizedValueFairValue

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- Definition The cumulative amount of amortization for mortgage servicing rights that has been recognized in the income statement. + References No definition available. + Details
Name: | fnlc_AccumulatedAmortizationMortgageServicingRights
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross amount, as of the balance sheet date, of mortgage servicing rights. + References No definition available. + Details
Name: | fnlc_MortgageServicingRightsGross
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A reserve for the amount of expected decrease in the value of mortgage servicing rights which cannot be physically measured. + References No definition available. + Details
Name: | fnlc_ReserveForImpairmentOfMortgageServicingRights
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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