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Loans - TDR's by Class and Specific Reserves More Than 30 Days Past Due (Details) $ in Thousands	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	12	15
Balance	$ 1,095	$ 2,814
Specific Reserves	$ 351	$ 93
Commercial |    Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	3
Balance	$ 0	$ 1,472
Specific Reserves	$ 0	$ 0
Commercial |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0
Commercial |    Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5	4
Balance	$ 641	$ 424
Specific Reserves	$ 351	$ 92
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0
Residential |    Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential |    Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	6	6
Balance	$ 450	$ 743
Specific Reserves	$ 0	$ 0
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	1
Balance	$ 0	$ 165
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 4	$ 10
Specific Reserves	$ 0	$ 1

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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Balance Type:	na
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_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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X

- 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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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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