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Allowance for Loan Losses Financing Receivable and Allowance Element by Class (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	$ 376,939	$ 380,731	$ 372,161
Allowance for loan losses	11,655	11,514	12,720	12,500
Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,786	2,461	3,105
General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,530	3,906	4,315
Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,509	3,469	4,211
Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,830	1,678	1,089
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	240,187	245,943	250,180
Allowance for loan losses	4,500	4,602	5,879	5,865
Commercial Real Estate Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,019	890	1,473
Commercial Real Estate Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,707	1,927	2,177
Commercial Real Estate Portfolio Segment [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,774	1,785	2,229
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	21,686	20,382	17,090
Allowance for loan losses	590	575	1,064	1,359
Commercial Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	276	272	760
Commercial Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	154	157	150
Commercial Construction [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	160	146	154
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	97,276	95,289	89,874
Allowance for loan losses	2,241	2,276	2,115	2,050
Commercial Other [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	834	841	535
Commercial Other [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	690	745	781
Commercial Other [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	717	690	799
Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	17,790	19,117	15,017
Allowance for loan losses	15	15	18	18
Municipal [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses		0	0
Municipal [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses		0	0
Municipal [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	15	15	18
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,232	1,099	1,113	1,109
Residential Term [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	574	404	337
Residential Term [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	303	342	336
Residential Term [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	355	353	440
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	22	21	9	11
Residential Construction [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0	0
Residential Construction [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10	10	4
Residential Construction [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	12	11	5
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	708	675	859	654
Home Equity [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	83	54	0
Home Equity [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	343	343	522
Home Equity [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	282	278	337
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	517	573	574	592
Consumer Portfolio Segment [Member] | Specific Reserves Evaluated Individually for Impairment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0	0
Consumer Portfolio Segment [Member] | General Reserves Based on Historical Loss Experience [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	323	382	345
Consumer Portfolio Segment [Member] | Reserve for Qualitative Factors [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	194	191	229
Unallocated Financing Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,830	1,678	1,089	842
Unallocated Financing Receivables [Member] | Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,830	1,678	1,089
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	35,848	41,532	50,039
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	23,576	27,115	34,530
Substandard [Member] | Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	777	795	1,881
Substandard [Member] | Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	11,495	13,622	13,628
Substandard [Member] | Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
7 Substandard	$ 0	$ 0	$ 0

X

- Definition

Loans subject to review and validation annually by independent consulting firm as well internal credit review function.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(d))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)(1)(ii)

-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

+ Details

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