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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
--- | ---
Mar. 31, 2013 loan | Mar. 31, 2012 loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 7 | 14
Pre-Modification Outstanding Recorded Investment | $ 2,948 | $ 3,007
Post-Modification Outstanding Recorded Investment | 2,959 | 2,973
Specific Reserves | 40 | 16
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 2 | 7
Pre-Modification Outstanding Recorded Investment | 1,897 | 2,438
Post-Modification Outstanding Recorded Investment | 1,897 | 2,404
Specific Reserves | 0 | 0
Commercial Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 0 | 0
Pre-Modification Outstanding Recorded Investment | 0 | 0
Post-Modification Outstanding Recorded Investment | 0 | 0
Specific Reserves | 0 | 0
Commercial Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 3 | 3
Pre-Modification Outstanding Recorded Investment | 536 | 12
Post-Modification Outstanding Recorded Investment | 546 | 12
Specific Reserves | 40 | 0
Municipal [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 0 | 0
Pre-Modification Outstanding Recorded Investment | 0 | 0
Post-Modification Outstanding Recorded Investment | 0 | 0
Specific Reserves | 0 | 0
Residential Term [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 1 | 4
Pre-Modification Outstanding Recorded Investment | 312 | 557
Post-Modification Outstanding Recorded Investment | 312 | 557
Specific Reserves | 0 | 16
Home Equity [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of Loans | 1 | 0
Pre-Modification Outstanding Recorded Investment | 203 | 0
Post-Modification Outstanding Recorded Investment | 204 | 0
Specific Reserves | $ 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 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 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
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration