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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
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

X

- Definition

The cumulative amount of amortization for mortgage servicing rights that has been recognized in the income statement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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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Balance Type:	debit
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- Details

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