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Allowance for Loan Losses TDR's by Class and the Associated Specific Reserves (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 loan	Mar. 31, 2012 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	11	11
Balance	$ 2,503	$ 2,258
Specific Reserves	421	73
Commercial Real Estate Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	2	0
Balance	409	0
Specific Reserves	0	0
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	0	4
Balance	0	667
Specific Reserves	0	44
Residential Term [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	9	7
Balance	2,094	1,591
Specific Reserves	$ 421	$ 29

X

- Definition

Specific allowance for loan and lease losses on receivable financings greater 30 days past due that are classified as troubled debt restructurings during the period and that had been placed in TDR status in the previous 12 months.

+ References

No definition available.

+ Details

Name:	fnlc_DaysPastDuePlacedInTDRInPrevious12Months
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

Name:	fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months
Namespace Prefix:	fnlc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Financing receivables that are greater than 30 days past due and that had been placed in TDR status in the previous 12 months.

+ References

No definition available.

+ Details

Name:	fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDuePlacedInTDRInPrevious12Months
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