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Certificates of Deposit (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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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

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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
Name: | fnlc_TimeDeposits250000OrMore
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
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
Name: | fnlc_TimeDepositsGreaterThan100000AndLessThan250000
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BankingAndThriftAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required.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
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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