Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Assets
Cash and cash equivalents	$ 13,855	$ 13,057	$ 13,894
Interest bearing deposits in other banks	336us-gaap_InterestBearingDepositsInBanks	3,559us-gaap_InterestBearingDepositsInBanks	2,935us-gaap_InterestBearingDepositsInBanks
Securities available for sale	156,317us-gaap_AvailableForSaleSecurities	185,261us-gaap_AvailableForSaleSecurities	305,700us-gaap_AvailableForSaleSecurities
Securities to be held to maturity (fair value of $267,247,000 at March 31, 2015, $279,704,000 at December 31, 2014 and $176,562,000 at March 31, 2014)	262,455us-gaap_HeldToMaturitySecurities	275,919us-gaap_HeldToMaturitySecurities	182,853us-gaap_HeldToMaturitySecurities
Restricted equity securities, at cost	13,912fnlc_RestrictedEquitySecuritiesAtCost	13,912fnlc_RestrictedEquitySecuritiesAtCost	13,912fnlc_RestrictedEquitySecuritiesAtCost
Loans held for sale	0	0	56
Loans	939,169	917,564	868,914
Less allowance for loan losses	10,196	10,344	11,655
Total loans	928,973	907,220	857,259
Accrued interest receivable	5,724us-gaap_InterestReceivable	4,748us-gaap_InterestReceivable	5,962us-gaap_InterestReceivable
Premises and equipment, net	22,270us-gaap_PropertyPlantAndEquipmentNet	22,619us-gaap_PropertyPlantAndEquipmentNet	23,239us-gaap_PropertyPlantAndEquipmentNet
Other real estate owned	2,899	3,785	4,934
Goodwill	29,805us-gaap_Goodwill	29,805us-gaap_Goodwill	29,805us-gaap_Goodwill
Other assets	22,286us-gaap_OtherAssets	22,246us-gaap_OtherAssets	25,568us-gaap_OtherAssets
Total assets	1,458,832us-gaap_Assets	1,482,131us-gaap_Assets	1,466,117us-gaap_Assets
Liabilities
Demand deposits	100,939us-gaap_DemandDepositAccounts	113,133us-gaap_DemandDepositAccounts	94,260us-gaap_DemandDepositAccounts
NOW deposits	199,099	199,977	158,278
Money market deposits	101,292us-gaap_DepositsMoneyMarketDeposits	98,607us-gaap_DepositsMoneyMarketDeposits	89,382us-gaap_DepositsMoneyMarketDeposits
Savings deposits	167,338us-gaap_DepositsSavingsDeposits	165,601us-gaap_DepositsSavingsDeposits	149,076us-gaap_DepositsSavingsDeposits
Certificates of deposit	398,157us-gaap_TimeDeposits	447,501us-gaap_TimeDeposits	554,974us-gaap_TimeDeposits
Total deposits	966,825us-gaap_Deposits	1,024,819us-gaap_Deposits	1,045,970us-gaap_Deposits
Borrowed funds – short term	167,437us-gaap_ShortTermBorrowings	189,775us-gaap_ShortTermBorrowings	123,372us-gaap_ShortTermBorrowings
Borrowed funds – long term	145,139us-gaap_LongTermDebt	90,141us-gaap_LongTermDebt	130,147us-gaap_LongTermDebt
Other liabilities	15,915us-gaap_OtherLiabilities	15,842us-gaap_OtherLiabilities	14,212us-gaap_OtherLiabilities
Total liabilities	1,295,316us-gaap_Liabilities	1,320,577us-gaap_Liabilities	1,313,701us-gaap_Liabilities
Shareholders' equity
Common stock, one cent par value per share	107us-gaap_CommonStockValue	107us-gaap_CommonStockValue	107us-gaap_CommonStockValue
Additional paid-in capital	59,286us-gaap_AdditionalPaidInCapital	59,282us-gaap_AdditionalPaidInCapital	58,600us-gaap_AdditionalPaidInCapital
Retained earnings	101,736	99,816	95,288
Accumulated other comprehensive income (loss)
Net unrealized gain (loss) on securities available for sale	2,579	2,522	(1,767)
Net unrealized loss on securities transferred from available for sale to held to maturity	(67)	(48)	0
Net unrealized gain (loss) on postretirement benefit costs	(125)	(125)	188
Total shareholders' equity	163,516us-gaap_StockholdersEquity	161,554us-gaap_StockholdersEquity	152,416us-gaap_StockholdersEquity
Total liabilities & shareholders' equity	$ 1,458,832	$ 1,482,131	$ 1,466,117
Common Stock
Number of shares authorized (shares)	18,000,000us-gaap_CommonStockSharesAuthorized	18,000,000us-gaap_CommonStockSharesAuthorized	18,000,000us-gaap_CommonStockSharesAuthorized
Number of shares issued (shares)	10,734,419us-gaap_CommonStockSharesIssued	10,724,359us-gaap_CommonStockSharesIssued	10,703,272us-gaap_CommonStockSharesIssued
Number of shares outstanding (shares)	10,734,419us-gaap_CommonStockSharesOutstanding	10,724,359us-gaap_CommonStockSharesOutstanding	10,703,272us-gaap_CommonStockSharesOutstanding
Book value per common share (usd per share)	$ 15.23fnlc_BookValuePerCommonShare	$ 15.06fnlc_BookValuePerCommonShare	$ 14.24fnlc_BookValuePerCommonShare
Tangible book value per common share (usd per share)	$ 12.43fnlc_TangibleBookValuePerCommonShare	$ 12.25fnlc_TangibleBookValuePerCommonShare	$ 11.40fnlc_TangibleBookValuePerCommonShare

Book value of common stock per share.

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Other Comprehensive Income (Loss), Accumulated Unrealized Gain (Loss) on Transfer of Available-for-sale Securities to Held-to-maturity

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Amount of stock held at Federal Home Loan Bank and Federal Reserve Bank. Federal Home Loan Bank (FHLB) stock and Federal Reserve Bank Stock represents an equity interest in a FHLB of FRB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Tangible book value of common stock per share.

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Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The amount of money in accounts that may bear interest and that the depositor is entitled to withdraw at any time without prior notice.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts.

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Amount of deposits in interest-bearing transaction accounts at banks or savings and loans, that are restricted in regard to ownership and can usually only be held by individuals, nonprofit entities and governments. Negotiable order of withdrawal accounts differ from money market demand accounts as they typically have higher reserve requirements and no limit on the number of checks that can be written.

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Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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For banks and other depository institutions (including Federal Reserve Banks, if applicable): Interest-bearing deposits in other financial institutions for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet.

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The aggregate carrying amount, as of the balance sheet date, of liabilities not separately disclosed in the balance sheet.

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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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