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Other Operating Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other operating expense
Advertising and marketing expense	$ 1,225	$ 1,187	$ 1,296
ATM and interchange expense	$ 1,871	$ 1,714	$ 1,568

X

- Definition

Fees incurred from processing ATM and debit card transaction fees.

+ References

No definition available.

+ Details

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

X

- Definition

Other Operating Expense [Abstract]

+ References

No definition available.

+ Details

Name:	fnlc_OtherOperatingExpenseAbstract
Namespace Prefix:	fnlc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total expense recognized in the period for promotion, public relations, and brand or product advertising.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_MarketingAndAdvertisingExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration