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Preferred and Common Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 0 Months Ended
Mar. 28, 2013
Mar. 31, 2015
Mar. 31, 2014
May 08, 2013
Mar. 27, 2013
Aug. 24, 2011
Jan. 09, 2009
Class of Stock [Line Items]              
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares)   225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 225,904us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights        
Exercise price of the Warrants (in dollars per share)   $ 16.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1          
Term of warrants   10 years          
Assumptions used in determining fair value of warrants, common stock price (in dollars per share)   $ 16.60fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsCommonStockPrice          
Assumptions used in determining fair value of warrants, dividend yield   4.70%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsDividendYield          
Assumptions used in determining fair value of warrants, stock price volatility   24.43%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsStockPriceVolatility          
Assumptions used in determining fair value of warrants, risk-free interest rate   2.01%fnlc_AssumptionsUsedInDeterminingFairValueOfWarrantsRiskFreeInterestRate          
Expected life of CPP Shares upon issuance   5 years          
Proceeds from sale of common stock (in shares) 760,771us-gaap_StockIssuedDuringPeriodSharesNewIssues            
Proceeds from sale of common stock $ 11,649us-gaap_ProceedsFromIssuanceOfCommonStock $ 110us-gaap_ProceedsFromIssuanceOfCommonStock $ 103us-gaap_ProceedsFromIssuanceOfCommonStock        
Outstanding CPP shares - value 10,000us-gaap_PreferredStockValueOutstanding            
Issuance of common stock for plans   110us-gaap_StockIssuedDuringPeriodValueNewIssues 103us-gaap_StockIssuedDuringPeriodValueNewIssues        
Capital Purchase Program              
Class of Stock [Line Items]              
Issuance of common stock for plans   110us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_ShareRepurchaseProgramAxis
= fnlc_CapitalPurchaseProgramMember
103us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_ShareRepurchaseProgramAxis
= fnlc_CapitalPurchaseProgramMember
       
Series A Preferred Stock              
Class of Stock [Line Items]              
Proceeds from issuance of CPP Shares             25,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Repurchase price of CPP shares (in dollars per share)             $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Cumulative dividend rate of CPP Shares (in hundredths)             5.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
CPP Shares dividend period (in years)             5 years
CPP Shares dividend rate after first five years (in hundredths)             9.00%fnlc_CppSharesDividendRateAfterFirstFiveYears
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Repurchase of fixed rate perpetual preferred stock, series A       $ 10,000us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 2,500us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 12,500us-gaap_PaymentsForRepurchaseOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember