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Investment Securities - Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | $ 10,798 | $ 11,930 | $ 14,048
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 10,798 | 11,930 | 14,048
Federal Home Loan Bank Stock |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 9,761 | 10,893 | 13,011
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | 9,761 | 10,893 | 13,011
Federal Reserve Bank Stock |  |  |
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

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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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Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
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

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- Definition [Line Items] for Restricted Equity Securities [Table] + References No definition available. + 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: | credit
Period Type: | instant

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

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- Details
Name: | fnlc_ScheduleOfRestrictedEquitySecuritiesAxis=fnlc_FederalHomeLoanBankStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | fnlc_ScheduleOfRestrictedEquitySecuritiesAxis=fnlc_FederalReserveBankStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |