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Allowance for Loan Losses TDR's by Class and the Associated Specific Reserves (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] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | $ 447 | $ 4,513 | $ 3,389 | $ 12,591
Number of loans | 18 | 15 | 18 | 15
Balance | 2,495 | 2,820 | 2,495 | 2,820
Specific Reserves | 10 | 170 | 10 | 170
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 0 | 3,150 | 1,890 | 7,171
Number of loans | 1 | 1 | 1 | 1
Balance | 60 | 263 | 60 | 263
Specific Reserves | 0 | 0 | 0 | 0
Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 0 | 0 | 0 | 1,951
Commercial Other [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 0 | 682 | 536 | 1,380
Number of loans | 2 | 2 | 2 | 2
Balance | 388 | 55 | 388 | 55
Specific Reserves | 0 | 22 | 0 | 22
Municipal [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 0 | 0 | 0 | 0
Residential Term [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 437 | 264 | 749 | 1,672
Number of loans | 13 | 12 | 13 | 12
Balance | 1,836 | 2,502 | 1,836 | 2,502
Specific Reserves | 10 | 148 | 10 | 148
Home Equity [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable Modifications Pre Modification Recorded Investment During Period | 10 | 417 | 214 | 417
Number of loans |  | 0 |  | 0
Balance |  | 0 |  | 0
Specific Reserves |  | $ 0 |  | $ 0

X
- 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

X
- 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

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

X
- 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

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