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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

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
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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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X

- Definition

[Line Items] for Restricted Equity Securities [Table]

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No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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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:	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

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X

- Details

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