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Loans - Summary of Loans to Directors and Executive Officers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward] |  |
Beginning balance | $ 23,293 | $ 20,401
New loans | 867 | 6,278
Repayments | (1,863) | (3,386)
Ending balance | $ 22,297 | $ 23,293

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- Definition Loans and Leases Receivables, Related Parties, Additions, Aggregated Over 60,000 Dollars + References No definition available. + Details
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Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Loans and Leases Receivables, Related Parties, Collections, Aggregated Over 60,000 Dollars + References No definition available. + Details
Name: | fnlc_LoansandLeasesReceivablesRelatedPartiesCollectionsAggregatedOver60000Dollars
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts which in aggregate exceed $60,000, due from related parties at the balance sheet date. + References No definition available. + Details
Name: | fnlc_RelatedPartyLoanReceivableAggregatedOver60000Dollars
Namespace Prefix: | fnlc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration