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Allowance for Loan Losses TDR's by Class of Loan and the Associated Specific Reserve (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 loan	Jun. 30, 2012 loan	Jun. 30, 2013 loan	Jun. 30, 2012 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	3	15	10	29
Pre-Modification Outstanding Recorded Investment	$ 936	$ 5,105	$ 3,890	$ 8,107
Post-Modification Outstanding Recorded Investment	783	4,955	3,724	7,919
Specific Reserves	0	1,454	0	1,468
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	0	5	2	12
Pre-Modification Outstanding Recorded Investment	0	1,598	1,897	4,032
Post-Modification Outstanding Recorded Investment	0	1,449	1,897	3,845
Specific Reserves	0	152	0	152
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	0	1	0	1
Pre-Modification Outstanding Recorded Investment	0	1,951	0	1,951
Post-Modification Outstanding Recorded Investment	0	1,951	0	1,951
Specific Reserves	0	696	0	696
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	2	6	5	9
Pre-Modification Outstanding Recorded Investment	623	701	1,164	713
Post-Modification Outstanding Recorded Investment	620	700	1,150	712
Specific Reserves	0	545	0	544
Municipal [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	0	0	0	0
Pre-Modification Outstanding Recorded Investment	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Specific Reserves	0	0	0	0
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	1	3	2	7
Pre-Modification Outstanding Recorded Investment	313	855	625	1,411
Post-Modification Outstanding Recorded Investment	163	855	475	1,411
Specific Reserves	0	61	0	76
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	0	0	1	0
Pre-Modification Outstanding Recorded Investment	0	0	204	0
Post-Modification Outstanding Recorded Investment	0	0	202	0
Specific Reserves	$ 0	$ 0	$ 0	$ 0

X

- Definition

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

+ References

No definition available.

+ Details

Name:	fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Namespace Prefix:	fnlc_
Data Type:	xbrli:integerItemType
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 after the financing receivable has been modified during the current period.

+ References

No definition available.

+ Details

Name:	fnlc_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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.

+ Details

Name:	fnlc_FinancingReceivableModificationsPreModificationRecordedInvestmentDuringPeriod
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

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