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Other Operating Income and Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- 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

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- 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

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- 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