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Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 21,134	$ 22,149
New loans	3,544	521
Repayments	(3,138)	(1,536)
Retired director	(326)	0
Ending balance	$ 21,214	$ 21,134

X

- Definition

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

+ References

No definition available.

+ Details

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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

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Namespace Prefix:	fnlc_
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Balance Type:	credit
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X

- Definition

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

+ 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

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

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Balance Type:	debit
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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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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