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v3.22.4

Other Operating Income and Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Other operating expense |  |  |
Advertising and marketing expense | $ 1,296 | $ 1,181 | $ 983
ATM and interchange expense | 1,568 | 1,446 | 1,253
Swap termination expense | 0 | 0 | 1,756
Other loan expenses | $ 627 | $ 2,198 | $ 0

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- Definition Fees incurred from processing ATM and debit card transaction fees. + References No definition available. + Details
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Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other Loan Expenses + References No definition available. + Details
Name: | fnlc_OtherLoanExpenses
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 Swap Termination Expense + References No definition available. + Details
Name: | fnlc_SwapTerminationExpense
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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