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Consolidated Statements of Income (Audited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 592fnlc_InterestIncomeAndFeesOnLoansTaxExempt	$ 567fnlc_InterestIncomeAndFeesOnLoansTaxExempt	$ 629fnlc_InterestIncomeAndFeesOnLoansTaxExempt
Interest and dividends on investments (tax-exempt income)	$ 5,854us-gaap_InterestIncomeSecuritiesTaxExempt	$ 6,065us-gaap_InterestIncomeSecuritiesTaxExempt	$ 5,175us-gaap_InterestIncomeSecuritiesTaxExempt

X

- Definition

Interest income and fees derived from loans which are exempt from federal income taxes.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.2)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 2

-Article 9

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