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Certificates of Deposit (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Banking and Thrift [Abstract]
Certificates of deposit less than $100,000	$ 137,166us-gaap_TimeDepositsLessThan100000	$ 184,471us-gaap_TimeDepositsLessThan100000	$ 230,762us-gaap_TimeDepositsLessThan100000
Certificates $100,000 to $250,000	210,657fnlc_TimeDepositsGreaterThan100000AndLessThan250000	221,892fnlc_TimeDepositsGreaterThan100000AndLessThan250000	278,185fnlc_TimeDepositsGreaterThan100000AndLessThan250000
Certificates $250,000 and over	50,334fnlc_TimeDeposits250000OrMore	41,138fnlc_TimeDeposits250000OrMore	46,027fnlc_TimeDeposits250000OrMore
Total certificates of deposit	$ 398,157us-gaap_TimeDeposits	$ 447,501us-gaap_TimeDeposits	$ 554,974us-gaap_TimeDeposits

X

- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $250,000.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to more than $100,000 but less than $250,000.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Details

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X

- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

+ 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 210.9-03.12)

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

+ Details

Name:	us-gaap_TimeDeposits
Namespace Prefix:	us-gaap_
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Balance Type:	credit
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X

- Definition

The aggregate amount of domestic or foreign time deposits (including certificates of deposits, individual retirement accounts and open accounts) that total to less than $100,000.

+ References

No definition available.

+ Details

Name:	us-gaap_TimeDepositsLessThan100000
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant