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Loans - TDRs by Class and Associated Specific Reserves (Details) $ in Thousands | Dec. 31, 2022 USD ($) loan
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Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 1
Balance | $ 97
Specific Reserves | $ 0
Commercial | Real Estate |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Commercial | Construction |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Commercial | Other |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 1
Balance | $ 97
Specific Reserves | $ 0
Municipal |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Residential | Construction |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Residential | Term |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Home Equity |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0
Consumer |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Number of Loans | loan | 0
Balance | $ 0
Specific Reserves | $ 0

X
- Definition The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months. + References No definition available. + Details
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Period Type: | instant

X
- Definition Financing receivables that are greater than 30 days past due and that had been placed in TDR status in the previous 12 months. + References No definition available. + Details
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Namespace Prefix: | fnlc_
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Period Type: | instant

X
- Definition Financing Receivable, Recorded Investment, Greater than 30 Days Past Due, Placed in TDR in Previous 12 Months, Specific Allowance during Period + References No definition available. + Details
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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X
- Details
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Namespace Prefix: |
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- Details
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