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Mortgage Servicing Rights Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Transfers and Servicing [Abstract]
Prepayment speed	12.83%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
Average quarterly discount rate	10 years
Discount rate adjustment rate	4.88%fnlc_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRateAdjustmentFactor
Origination of Mortgage Servicing Rights (MSRs)	$ 64us-gaap_ServicingAssetAtFairValueAdditions	$ 81us-gaap_ServicingAssetAtFairValueAdditions
Amortization of Mortgage Servicing Rights (MSRs)	104us-gaap_AmortizationOfMortgageServicingRightsMSRs	114us-gaap_AmortizationOfMortgageServicingRightsMSRs
Servicing Asset at Fair Value, Amount	1,746us-gaap_ServicingAssetAtFairValueAmount	2,114us-gaap_ServicingAssetAtFairValueAmount	2,088us-gaap_ServicingAssetAtFairValueAmount
Residential mortgage loans serviced for others, principal	$ 214,537fnlc_ResidentialMortgageLoansServicedForOthersOutstandingPrincipal	$ 211,725fnlc_ResidentialMortgageLoansServicedForOthersOutstandingPrincipal	$ 214,086fnlc_ResidentialMortgageLoansServicedForOthersOutstandingPrincipal

X

- Definition

The average quarterly discount rate period used as assumption in evaluating the carrying value of mortgage servicing rights.

+ References

No definition available.

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- Definition

Dollar amount of principal outstanding on loans being serviced for others at the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

The amount of rate spread added to the ten-year US Treasury rate to derive the discount rate used in the fair value calculation for the loan servicing portfolio.

+ References

No definition available.

+ Details

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- Definition

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. 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=56944662&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122739-111746

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122625-111746

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122625-111746

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 2

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=56950315&loc=d3e122596-111746

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