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Certificates of Deposit (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
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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

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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 more than $250,000. + References No definition available. + Details
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Namespace Prefix: | fnlc_
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Balance Type: | credit
Period Type: | instant

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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 more than $100,000 but less than $250,000. + References No definition available. + Details
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Namespace Prefix: | fnlc_
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- 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 + Details
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Data Type: | xbrli:monetaryItemType
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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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