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Investment Securities Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | $ 13,875,000 | $ 14,257,000 | $ 13,912,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 13,875,000 | 14,257,000 | 13,912,000
Federal Home Loan Bank Stock |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 12,838,000 | 13,220,000 | 12,875,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 12,838,000 | 13,220,000 | 12,875,000
Federal Reserve Bank Stock |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 1,037,000 | 1,037,000 | 1,037,000
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 1,037,000 | $ 1,037,000 | $ 1,037,000

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- 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
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Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
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- Definition [Line Items] for Restricted Equity Securities [Table] + References No definition available. + Details
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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
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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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |