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Allowance for Loan Losses Allowance for Loan Losses Narrative (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loan	Mar. 31, 2012 loan	Dec. 31, 2012 loan	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 12,720	$ 12,954	$ 12,500	$ 13,000
Adverse variance	20.00%
Loan value, lower range	75.00%
Construction loans accrual to company capital	17.00%
Contstructions loan portfolio maximum to company captial	100.00%
Construction and non owner occupied commercial real estate	73.90%
Construction and non owner occupied commercial real estae maximum	300.00%
Outstanding loans and commitments subject by independent consulting firm	50.00%
Residential loans typical loan to value range, high	80.00%
Collateralized consumer loans to individuals loan to value maximum, lower range	80.00%
Collateralized consumer loans to individuals loan to value maximum, higher range	90.00%
Number of Loans	106	71	101
Balance	31,147	20,647	29,955
Number of contracts greater than 30 days past due	11	11
Recorded investment greater than 30 days past due	2,503	2,258
Number of loans classified as TDR in previous 12 months	2	7
Loans classified as TDR in last 12 months	409	1,733
Number of Loans	7	14
Pre-Modification Outstanding Recorded Investment	2,948	3,007
Number of TDR loans that are involved in bankruptcy	13
Loans classified as TDR that are involved in bankruptcy	1,222
Number of loans classified as TDR that were on non accrual status	28
Financing Receivalbe, Number of Loans Classified As Troubled Debt Restructurings Classifed As NonAccrual	4,695
Number of loans classified as TDR involved in foreclosure	4
Loans classified as TDR that are involved in Foreclosure	504
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Deliquent period before residential loans placed on non accrual status	120 days
Residential Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	9	59	11	255
Deliquent period before residential loans placed on non accrual status	90 days
Unallocated Financing Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,089	1,699	842	2,008
Number of days past due	30 days	30 days
Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	1,089	1,699	842
Unallocated Reserves [Member] | Unallocated Financing Receivables [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 1,089	$ 1,699	$ 842

X

- Definition

The high maximum percentage of loan to value for consumer loans based on purchase price of the collateral.

+ References

No definition available.

+ Details

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- Definition

The low maximum percentage of loan to value for consumer loans based on purchase price of the collateral.

+ References

No definition available.

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X

- Definition

The regulatory maximum allowed ratio of loan portfolio to Company capital for construction and non-owner-occupied commercial real estate.

+ References

No definition available.

+ Details

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X

- Definition

The actual ratio of loan amount to Company capital for construction and non-owner-occupied commercial real estate.

+ References

No definition available.

+ Details

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X

- Definition

The regulatory maximum allowed ratio of loan portfolio to Company capital for construction loans.

+ References

No definition available.

+ Details

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X

- Definition

The ratio of loan portfolio to Company capital for construction loans .

+ References

No definition available.

+ Details

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X

- Definition

The minimum amount of days past due at which residential loans are placed on non-accrual status..

+ References

No definition available.

+ Details

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- Definition

Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.

+ References

No definition available.

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- Definition

Carrying amount of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 montsh.

+ References

No definition available.

+ Details

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X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings during the current period.

+ References

No definition available.

+ Details

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X

- Definition

The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months.

+ References

No definition available.

+ Details

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- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings before the financing receivable has been modified during the current period.

+ References

No definition available.

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- Definition

Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure

+ References

No definition available.

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- Definition

The number of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

The number of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 months.

+ References

No definition available.

+ Details

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X

- Definition

The number of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Financing receivables that are greater than 30 days past due.

+ References

No definition available.

+ Details

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- Definition

Financing Receivalbe, Number of Loans Classified As Troubled Debt Restructurings Classifed As NonAccrual

+ References

No definition available.

+ Details

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X

- Definition

Loans classified as troubled debt restructurings that are involved in foreclosure as of the balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Number Of Days Past Due

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Percentage of loans and commitments subject to review by an independent consulting firm each year.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Property Value, Variance Below Estimated Value

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The high percentage of loan to value range for residential loans based on current appraisal information.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

The low percentage of loan to value range for residential loans based on current appraisal information.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Details

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- 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

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- 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

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- 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 Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Paragraph 2

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



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

-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.9-03.7(d))

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



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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph a(ii)

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.



Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 114

-Paragraph 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section L

-Subsection 1

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