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Loans TDR's by Class and Specific Reserves (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2014 loan	Mar. 31, 2013 loan	Dec. 31, 2013 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	101	106	99
Balance	$ 28,796	$ 31,147	$ 29,098
Specific Reserves	1,246	2,590	1,017
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	20	20	20
Balance	12,925	13,715	13,018
Specific Reserves	520	313	433
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	1	3	1
Balance	1,284	2,317	1,284
Specific Reserves	277	1,194	274
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	19	24	20
Balance	2,300	3,063	2,734
Specific Reserves	103	40	100
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	56	54	53
Balance	11,450	11,195	11,220
Specific Reserves	346	1,034	210
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	5	5	5
Balance	837	857	842
Specific Reserves	$ 0	$ 9	$ 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

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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=28368275&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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=25495931&loc=d3e18845-111554

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Balance Type:	debit
Period Type:	instant