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Mortgage Servicing Rights Included in Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Transfers and Servicing [Abstract]
Mortgage servicing rights	$ 6,398	$ 6,039	$ 5,928
Accumulated amortization	(5,287)	(4,949)	(4,848)
Impairment reserve	(16)	(4)	(2)
Total Servicing asset at fair value	$ 1,095	$ 1,086	$ 1,078

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

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

X

- 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
Period Type:	instant

X

- References

No definition available.

+ Details

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