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Investment Securities Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | $ 13,912 | $ 14,448 | $ 14,823
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 13,912 | 14,448 | 14,823
Federal Home Loan Bank Stock [Member] |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 12,876 | 13,412 | 13,412
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 12,876 | 13,412 | 13,412
Federal Reserve Bank Stock [Member] |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 1,036 | 1,036 | 1,411
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 1,036 | $ 1,036 | $ 1,411

X
- Definition This item represents the cost of equity securities in Federal Home loan Banks and Federal Reserve Bank reported at cost and categorized as non-marketable with no determinable fair value because it ownership is restricted and it lacks a market. + References No definition available. + Details
Name: | fnlc_RestrictedEquitySecuritiesAmortizedCost
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | fnlc_RestrictedEquitySecuritiesLineItems
Namespace Prefix: | fnlc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References No definition available. + Details
Name: | fnlc_RestrictedEquitySecuritiesUnrealizedGains
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References No definition available. + Details
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Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of non marketable securities as of the balance sheet date. + References No definition available. + Details
Name: | fnlc_RestrictedEquiySecuritiesFairValueEstimated
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant