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Allowance for Loan Losses TDR's by Class of Loan and the Associated Specific Reserve (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 loan | Sep. 30, 2012 loan | Sep. 30, 2013 loan | Sep. 30, 2012 loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 3 | 11 | 10 | 38
Post-Modification Outstanding Recorded Investment | $ 410 | $ 4,512 | $ 3,336 | $ 12,369
Specific Reserves | 0 | 46 | 0 | 1,501
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 0 | 2 | 2 | 13
Post-Modification Outstanding Recorded Investment | 0 | 3,150 | 1,890 | 6,962
Specific Reserves | 0 | 29 | 0 | 175
Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 0 | 0 | 0 | 1
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 1,951
Specific Reserves | 0 | 0 | 0 | 696
Commercial Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 0 | 6 | 3 | 14
Post-Modification Outstanding Recorded Investment | 0 | 682 | 523 | 1,369
Specific Reserves | 0 | 2 | 0 | 546
Municipal [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 0 | 0 | 0 | 0
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Specific Reserves | 0 | 0 | 0 | 0
Residential Term [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 2 | 2 | 3 | 9
Post-Modification Outstanding Recorded Investment | 400 | 263 | 712 | 1,670
Specific Reserves | 0 | 15 | 0 | 84
Home Equity [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of Loans | 1 | 1 | 2 | 1
Post-Modification Outstanding Recorded Investment | 10 | 417 | 211 | 417
Specific Reserves | $ 0 | $ 0 | $ 0 | $ 0

X
- Definition The number of financing receivables that have been modified by troubled debt restructurings during the current period. + References No definition available. + Details
Name: | fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod
Namespace Prefix: | fnlc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings after the financing receivable has been modified during the current period. + References No definition available. + Details
Name: | fnlc_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Specific allowance for loan and lease losses on receivable financings that are classified as troubled debt restructurings during the current period. + References No definition available. + Details
Name: | fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceCurrentPeriod
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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