| **Consolidated Statements of Income and Comprehensive Income (Loss) (Unaudited) (USD $)In Thousands, except Per Share data, unless otherwise specified** | 3 Months Ended                                                                                                           |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------|
||
| **Interest income**                                                                                                                                      |                                                                                                                     |   |
| Interest and fees on loans                                                                                                                               | $ 8,855us-gaap_InterestAndFeeIncomeLoansAndLeases                                                                        | $ 8,578us-gaap_InterestAndFeeIncomeLoansAndLeases |
| Interest on deposits with other banks                                                                                                                    | 5us-gaap_InterestIncomeDepositsWithFinancialInstitutions                                                                 | 2us-gaap_InterestIncomeDepositsWithFinancialInstitutions |
| Interest and dividends on investments                                                                                                                    | 3,505us-gaap_InterestAndDividendIncomeSecurities                                                                         | 4,043us-gaap_InterestAndDividendIncomeSecurities |
| Total interest income                                                                                                                                    | 12,365us-gaap_InterestAndDividendIncomeOperating                                                                         | 12,623us-gaap_InterestAndDividendIncomeOperating |
| **Interest expense**                                                                                                                                     |                                                                                                                     |   |
| Interest on deposits                                                                                                                                     | 1,443us-gaap_InterestExpenseDeposits                                                                                     | 1,825us-gaap_InterestExpenseDeposits |
| Interest on borrowed funds                                                                                                                               | 1,220us-gaap_InterestExpenseBorrowings                                                                                   | 1,087us-gaap_InterestExpenseBorrowings |
| Total interest expense                                                                                                                                   | 2,663us-gaap_InterestExpense                                                                                             | 2,912us-gaap_InterestExpense |
| Net interest income                                                                                                                                      | 9,702us-gaap_InterestIncomeExpenseNet                                                                                    | 9,711us-gaap_InterestIncomeExpenseNet |
| Provision for loan losses                                                                                                                                | 500us-gaap_ProvisionForLoanAndLeaseLosses                                                                                | 400us-gaap_ProvisionForLoanAndLeaseLosses |
| Net interest income after provision for loan losses                                                                                                      | 9,202us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss                                                              | 9,311us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss |
| **Non-interest income**                                                                                                                                  |                                                                                                                     |   |
| Investment management and fiduciary income                                                                                                               | 541us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities                                                                 | 517us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities |
| Service charges on deposit accounts                                                                                                                      | 579us-gaap_FeesAndCommissionsDepositorAccounts                                                                           | 619us-gaap_FeesAndCommissionsDepositorAccounts |
| Net securities gains                                                                                                                                     | 1,395us-gaap_GainLossOnSaleOfSecuritiesNet                                                                               | 36us-gaap_GainLossOnSaleOfSecuritiesNet |
| Mortgage origination and servicing income, net of amortization                                                                                           | 197us-gaap_FeesAndCommissionsMortgageBanking                                                                             | 194us-gaap_FeesAndCommissionsMortgageBanking |
| Other operating income                                                                                                                                   | 946us-gaap_NoninterestIncomeOtherOperatingIncome                                                                         | 966us-gaap_NoninterestIncomeOtherOperatingIncome |
| Total non-interest income                                                                                                                                | 3,658us-gaap_NoninterestIncome                                                                                           | 2,332us-gaap_NoninterestIncome |
| **Non-interest expense**                                                                                                                                 |                                                                                                                     |   |
| Salaries and employee benefits                                                                                                                           | 3,720us-gaap_LaborAndRelatedExpense                                                                                      | 3,697us-gaap_LaborAndRelatedExpense |
| Occupancy expense                                                                                                                                        | 645us-gaap_OccupancyNet                                                                                                  | 612us-gaap_OccupancyNet |
| Furniture and equipment expense                                                                                                                          | 770us-gaap_EquipmentExpense                                                                                              | 697us-gaap_EquipmentExpense |
| FDIC insurance premiums                                                                                                                                  | 230us-gaap_FederalDepositInsuranceCorporationPremiumExpense                                                              | 265us-gaap_FederalDepositInsuranceCorporationPremiumExpense |
| Amortization of identified intangibles                                                                                                                   | 25us-gaap_AmortizationOfIntangibleAssets                                                                                 | 82us-gaap_AmortizationOfIntangibleAssets |
| Other operating expense                                                                                                                                  | 1,875us-gaap_OtherNoninterestExpense                                                                                     | 1,899us-gaap_OtherNoninterestExpense |
| Total non-interest expense                                                                                                                               | 7,265us-gaap_NoninterestExpense                                                                                          | 7,252us-gaap_NoninterestExpense |
| Income before income taxes                                                                                                                               | 5,595us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 4,391us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
| Income tax expense                                                                                                                                       | 1,420us-gaap_IncomeTaxExpenseBenefit                                                                                     | 963us-gaap_IncomeTaxExpenseBenefit |
| NET INCOME                                                                                                                                               | 4,175us-gaap_NetIncomeLoss                                                                                               | 3,428us-gaap_NetIncomeLoss |
| Basic earnings per common share (usd per share)                                                                                                          | $ 0.39us-gaap_EarningsPerShareBasic                                                                                      | $ 0.32us-gaap_EarningsPerShareBasic |
| Diluted earnings per common share (usd per share)                                                                                                        | $ 0.39us-gaap_EarningsPerShareDiluted                                                                                    | $ 0.32us-gaap_EarningsPerShareDiluted |
| **Other comprehensive income (loss) net of tax**                                                                                                         |                                                                                                                     |   |
| Net unrealized gain on securities available for sale                                                                                                     | 57us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax                       | 4,824us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
| Net unrealized loss on securities transferred from available for sale to held to maturity, net of amortization                                           | (19)fnlc_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss                               | 0fnlc_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss |
| Other comprehensive income                                                                                                                               | 38us-gaap_OtherComprehensiveIncomeLossNetOfTax                                                                           | 4,824us-gaap_OtherComprehensiveIncomeLossNetOfTax |
| Comprehensive income                                                                                                                                     | $ 4,213us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest                           | $ 8,252us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |

| X                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Available-for-sale Securities, Transferred to Held-to-maturity Securities, Unrealized Gain (Loss)
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No definition available.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
This element represents equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses.
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| - Definition
Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Includes amounts charged depositors for: (1) maintenance of their accounts (maintenance charges); (2) failure to maintain specified minimum balances on account; (3) exceeding the number of checks or transactions allowed to be processed in a given period; (4) checks drawn on no minimum balance deposit accounts; (5) withdrawals from nontransaction deposit accounts; (6) closing savings accounts before a specified minimum period of time has elapsed; (7) accounts which have remained inactive for extended periods of time or which have become dormant; (8) use of automated teller machines or remote service units; (9) checks drawn against insufficient funds that the bank assesses regardless of whether it decides to pay, return or hold the check; (10) issuing stop payment orders; (11) certifying checks; and (12) accumulating or disbursing funds deposited in IRAs or Keogh Plan accounts when not handled by the bank's trust department. This item does not include penalties assessed on the early withdrawal of time deposits.
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| - Definition
Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department.
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| - Definition
The noninterest income derived from mortgage banking activities (fees and commissions), excluding fees earned from servicing third-party assets.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.
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| - Definition
Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.
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| - Definition
The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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| - Definition
Aggregate amount of interest expense on all borrowings.
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Aggregate amount of interest expense on all deposits.
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Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts.
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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.
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The net amount of operating interest income (expense).
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The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Total aggregate amount of all noninterest expense.
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| - Definition
The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.
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Represents other forms of revenue earned, excluding interest, which is not otherwise specified in the taxonomy.
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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
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Other noninterest expenses that are not separately presented in any other noninterest expense category.
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Amount of expense related to estimated loss from loan and lease transactions.
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