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v2.4.1.9

Preferred and Common Stock (Details) (USD $) | 0 Months Ended | 12 Months Ended | 48 Months Ended | 168 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 09, 2013 | Dec. 31, 2014 | May 08, 2013 | Mar. 27, 2013 | Aug. 24, 2011 | Jan. 09, 2009 | Dec. 31, 2001
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of CPP Shares |  |  |  |  |  | $ 25,000,000 us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock |  |  |  |  |  |
Purchase price of CPP Shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 1,000 fnlc_PerSharePurchasePriceOfCppShares |
Cumulative dividend rate of CPP Shares (in hundredths) |  |  |  |  |  | 5.00%us-gaap_PreferredStockDividendRatePercentage |  |  |  |  |  |
CPP Shares dividend period (in years) |  |  |  |  |  | 5 years |  |  |  |  |  |
CPP Shares dividend rate after first five years (in hundredths) |  |  |  |  |  | 9.00%fnlc_CppSharesDividendRateAfterFirstFiveYears |  |  |  |  |  |
Dividend payment terms |  |  |  |  |  | payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year |  |  |  |  |  |
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares) |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  | 225,904 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |
Exercise price of the Warrants (in dollars per share) |  | 16.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights |  |  |  |  | 16.60 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights |  |  |  |  |
Term of warrants issued (in years) |  | 10 years |  |  |  |  |  |  |  |  |  |
Assumptions used in determining fair value of warrants, common stock price (in dollars per share) |  | $ 16.60 fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsCommonStockPrice |  |  |  |  | $ 16.60 fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsCommonStockPrice |  |  |  |  |
Assumptions used in determining fair value of warrants, dividend yield (in hundredths) |  | 4.70%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsDividendYield |  |  |  |  |  |  |  |  |  |
Assumptions used in determining fair value of warrants, stock price volatility (in hundredths) |  | 24.43%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsStockPriceVolatility |  |  |  |  |  |  |  |  |  |
Assumptions used in determining fair value of warrants, risk-free interest rate (in hundredths) |  | 2.01%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsRiskFreeInterestRate |  |  |  |  |  |  |  |  |  |
Expected life of CPP Shares upon issuance (in years) |  | 5 years |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 12,500,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock | 0 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock |  |  |  |  |  |  |  |
Number of shares available to directors and employees for stock purchase or savings and investment plans (in shares) |  | 700,000 fnlc_NumberOfSharesAvailableForGrantUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  | 700,000 fnlc_NumberOfSharesAvailableForGrantUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  |
Number of shares issued under employee savings and investment plan (in shares) |  | 548,434 fnlc_NumberOfSharesIssuedUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  | 548,434 fnlc_NumberOfSharesIssuedUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  |
Number of shares available for future use under employee savings and investment plan (in shares) |  | 151,566 fnlc_NumberOfSharesAvailableForFutureUseUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  | 151,566 fnlc_NumberOfSharesAvailableForFutureUseUnderEmployeeSavingsAndInvestmentPlan |  |  |  |  |
Number of shares issued during period, employee benefit plan (in shares) |  | 14,638 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans | 11,385 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  | 12,451 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans |  |  |  |  |  |  |
Number of shares registered with SEC for dividend reinvestment plan (in shares) |  |  |  |  |  |  |  |  |  |  |  | 600,000 fnlc_NumberOfSharesRegisteredPursuantToDividendReinvestmentPlan
Number of shares issued during period, dividend reinvestment plan (in shares) |  | 12,686 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 12,008 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan | 14,056 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan |  |  | 225,274 us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan |  |  |  |  |
Stock Remaining under Plan, Shares, Dividend Reinvestment Plan |  | 374,726 fnlc_StockRemainingunderPlanSharesDividendReinvestmentPlan |  |  |  |  |  |  |  |  |  |
Number of trading days immediately preceding dividend payment date used in determining per share price of shares purchased |  | 5 days |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock (in shares) | 760,771 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock | 11,649,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 457,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 11,973,000 us-gaap_ProceedsFromIssuanceOfCommonStock | 499,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding | 10,000,000 us-gaap_PreferredStockValueOutstanding |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Preferred Stock and Preference Stock |  |  |  |  |  |  |  | 10,000,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 2,500,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 12,500,000 us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember |  |
Capital Purchase Program |  |  |  |  |  |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 457,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_ShareRepurchaseProgramAxis = fnlc_CapitalPurchaseProgramMember | $ 324,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_ShareRepurchaseProgramAxis = fnlc_CapitalPurchaseProgramMember |  |  |  |  |  |  |  |  |

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