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Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Transfers and Servicing [Abstract] |  |
Mortgage servicing rights | $ 8,741 | $ 8,702
Accumulated amortization | (6,847) | (6,525)
Carrying value | $ 1,894 | $ 2,177

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- Definition The cumulative amount of amortization for mortgage servicing rights that has been recognized in the income statement. + References No definition available. + Details
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Balance Type: | credit
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- Definition Gross amount, as of the balance sheet date, of mortgage servicing rights. + References No definition available. + Details
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Namespace Prefix: | fnlc_
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- Definition Fair value of 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 (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480591/815-20-50-1 + Details
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Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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