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Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 20,401	$ 14,856
New loans	6,278	7,382
Repayments	(3,386)	(1,837)
Ending balance	$ 23,293	$ 20,401

X

- Definition

Loans and Leases Receivables, Related Parties, Additions, Aggregated Over 60,000 Dollars

+ References

No definition available.

+ Details

Name:	fnlc_LoansandLeasesReceivablesRelatedPartiesAdditionsAggregatedOver60000Dollars
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Loans and Leases Receivables, Related Parties, Collections, Aggregated Over 60,000 Dollars

+ References

No definition available.

+ Details

Name:	fnlc_LoansandLeasesReceivablesRelatedPartiesCollectionsAggregatedOver60000Dollars
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts which in aggregate exceed $60,000, due from related parties at the balance sheet date.

+ References

No definition available.

+ Details

Name:	fnlc_RelatedPartyLoanReceivableAggregatedOver60000Dollars
Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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