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Certificates of Deposit (Details) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Certificates of deposit by balance [Abstract]
Certificates of deposit less than $100,000	$ 239,635,000	$ 216,836,000	$ 279,567,000
Certificates $100,000 to $250,000	313,742,000	309,841,000	319,122,000
Certificates $250,000 and over	60,501,000	22,499,000	34,609,000
Total certificates of deposit	$ 613,878,000	$ 549,176,000	$ 633,298,000

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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Period Type:	instant

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

- Definition

The aggregate amount of time deposits, including certificates of deposits, individual retirement accounts and open accounts.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 9



Reference 2: 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

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- Details

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- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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