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Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Transfers and Servicing [Abstract]
Mortgage servicing rights	$ 5,611	$ 5,428	$ 5,199
Accumulated amortization	(4,312)	(4,160)	(4,072)
Impairment reserve	0	0	(18)
Total servicing asset at fair value	$ 1,299	$ 1,268	$ 1,109

X

- Definition

The cumulative amount of amortization for mortgage servicing rights that has been recognized in the income statement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Gross amount, as of the balance sheet date, of mortgage servicing rights.

+ References

No definition available.

+ Details

Name:	fnlc_MortgageServicingRightsGross
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A reserve for the amount of expected decrease in the value of mortgage servicing rights which cannot be physically measured.

+ References

No definition available.

+ Details

Name:	fnlc_ReserveForImpairmentOfMortgageServicingRights
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration