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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

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

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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]

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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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
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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
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X

- Details

Name:	fnlc_ScheduleOfRestrictedEquitySecuritiesAxis=fnlc_FederalHomeLoanBankStockMember
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Period Type:

X

- Details

Name:	fnlc_ScheduleOfRestrictedEquitySecuritiesAxis=fnlc_FederalReserveBankStockMember
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