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Allowance for Loan Losses TDR's by Class and Specific Reserve (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013 loan	Dec. 31, 2012 loan	Sep. 30, 2012 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	104	101	91
Balance	$ 29,921	$ 29,955	$ 29,349
Specific Reserves	1,378	2,590	2,484
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	20	18	18
Balance	13,520	11,961	12,329
Specific Reserves	853	823	823
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	2	3	2
Balance	1,364	3,319	3,099
Specific Reserves	270	969	696
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	21	23	20
Balance	2,828	3,074	2,614
Specific Reserves	100	574	594
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	55	53	50
Balance	11,353	10,945	10,890
Specific Reserves	149	224	371
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	6	4	1
Balance	856	656	417
Specific Reserves	$ 6	$ 0	$ 0

X

- Definition

Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings during the period.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant