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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, 2014 | Dec. 31, 2013 | Mar. 31, 2013
--- | --- | --- | ---
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | $ 13,912 | $ 13,912 | $ 13,912
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 13,912 | 13,912 | 13,912
Federal Home Loan Bank Stock [Member] |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 12,875 | 12,875 | 12,875
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 12,875 | 12,875 | 12,875
Federal Reserve Bank Stock [Member] |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 1,037 | 1,037 | 1,037
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 1,037 | $ 1,037 | $ 1,037

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
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Balance Type: | debit
Period Type: | instant

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- 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_RestrictedEquitySecuritiesFairValueEstimated
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | fnlc_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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: | debit
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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_
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Balance Type: | credit
Period Type: | instant