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Allowance for Loan Losses TDR's by Class and the Associated Specific Reserves (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 loan | Mar. 31, 2012 loan
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | 11 | 11
Balance | $ 2,503 | $ 2,258
Specific Reserves | 421 | 73
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | 2 | 0
Balance | 409 | 0
Specific Reserves | 0 | 0
Commercial Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | 0 | 4
Balance | 0 | 667
Specific Reserves | 0 | 44
Residential Term [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of loans | 9 | 7
Balance | 2,094 | 1,591
Specific Reserves | $ 421 | $ 29

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- Definition Specific allowance for loan and lease losses on receivable financings greater 30 days past due that are classified as troubled debt restructurings during the period and that had been placed in TDR status in the previous 12 months. + References No definition available. + Details
Name: | fnlc_DaysPastDuePlacedInTDRInPrevious12Months
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months. + References No definition available. + Details
Name: | fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months
Namespace Prefix: | fnlc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Financing receivables that are greater than 30 days past due and that had been placed in TDR status in the previous 12 months. + References No definition available. + Details
Name: | fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDuePlacedInTDRInPrevious12Months
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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