Allowance for Loan and Lease Losses, Related Loans, Percentage

No definition available.

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Data Type:	num:percentItemType
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Period Type:	duration

- Definition

Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease)

+ References

No definition available.

+ Details

Name:	fnlc_AllowanceforLoanandLeaseLossesRelatedLoansPeriodIncreaseDecrease
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Allowance for Loan Losses of Total Loans, Percentage

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- 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

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

Name:	fnlc_DelinquentPeriodBeforeResidentialLoansPlacedOnNonAccrualStatus
Namespace Prefix:	fnlc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

Percentage of Total Reserve Allowance accounted for by Loan Loss Allowances

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Details

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

- 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

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

Allowance for Loan Losses Narrative (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for Loan and Lease Losses, Related Loans, Percentage	0.39%	0.40%
Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease)	$ 81
Less allowance for loan losses	11,641	11,514	11,644	12,457	12,670	12,500
Allowance for loan losses as a percent of total loans	1.28%	1.31%		1.45%
Loan value, lower range	75.00%
Construction loans accrual to company capital	28.60%
Constructions loan portfolio maximum to company capital	100.00%
Construction and non owner occupied commercial real estate	93.10%
Construction And Non Owner Occupied Commercial Real Estate Loans Maximum Loan Portfolio To Company Capital	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%
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent 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	20	21	23	15	9	11
Delinquent period before residential loans placed on non accrual status	90 days
Unallocated Reserves [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for loan losses	$ 2,113	$ 1,678		$ 1,544
Percentage of Total Reserve Allowance accounted for by Loan Loss Allowances	18.00%