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Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loans and Leases Receivable, Related Parties [Roll Forward]
Beginning balance	$ 33,524	$ 29,490
New loans	3,462	9,921
Repayments	(4,804)	(5,598)
Retired director	0	(289)
Ending balance	$ 32,182	$ 33,524

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_
Data Type:	xbrli:monetaryItemType
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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Balance Type:	na
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