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Fair Value - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Mortgage servicing rights impairment	$ 0	$ 0	$ 0
Valuation allowance on individually analyzed financing receivable	$ 0	$ 132,000	$ 19,000

X

- Definition

Individually Analyzed Financing Receivable, Related Allowance, Measured at Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)(6)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481229/860-50-50-4

+ Details

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