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Borrowed Funds (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Debt Instrument [Line Items]                
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Five 0.00%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFive              
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due Thereafter 0.00%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueThereafter 0.00%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueThereafter            
Disclosure of Repurchase Agreements [Abstract]                
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Maximum Amount Available $ 232,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable              
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Amount of Available, Unused Funds 26,800,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds              
Range of Repurchase agreements' maturity dates one to 365              
Amount of Line of credit with correspondent banks 48,000,000fnlc_LineOfCreditWithCorrespondentBanks              
Credit facility with Federal Reserve Bank 92,000,000fnlc_CreditFacilityWithFederalReserveBankOfBoston              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Due in Twelve Months Maturity 115,050,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate 54,500,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate            
Due in Year Two Maturity 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate 40,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate            
Due in Year Three Maturity 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate            
Due in Year Four Maturity 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate            
Due in Year Five Maturity 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate 30,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate            
Due Thereafter 141,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate 148,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate            
Total 205,191,000us-gaap_AdvancesFromFederalHomeLoanBanks 184,648,000us-gaap_AdvancesFromFederalHomeLoanBanks            
Repurchase Agreements for municipal and commercial customers 74,725,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase 94,477,000us-gaap_SecuritiesSoldUnderAgreementsToRepurchase            
Total $ 279,916,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 279,125,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 258,636,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 298,520,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 253,519,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 266,777,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 257,108,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements $ 261,185,000fnlc_TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements
Minimum                
Debt Instrument [Line Items]                
Repurchase Agreement Counterparty, Maturity of Agreements 1 day              
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Next Twelve Months 0.22%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinNextTwelveMonths
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.28%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinNextTwelveMonths
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Two 2.36%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearTwo
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2.03%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearTwo
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Three 0.99%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
2.36%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Four 2.25%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFour
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.99%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFour
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Five   2.25%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFive
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Securities Sold under Agreements to Repurchase, Stated Rate 0.20%fnlc_SecuritiesSoldunderAgreementstoRepurchaseStatedRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
0.20%fnlc_SecuritiesSoldunderAgreementstoRepurchaseStatedRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
           
Maximum                
Debt Instrument [Line Items]                
Repurchase Agreement Counterparty, Maturity of Agreements 365 days              
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Next Twelve Months 2.98%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinNextTwelveMonths
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
3.20%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinNextTwelveMonths
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Two 2.44%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearTwo
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
2.98%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearTwo
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Three 3.69%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
2.44%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Four 3.25%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFour
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
3.69%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFour
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Federal Home Loan Bank, Advances, Interest Rate, Maturities Summary, Due in Year Five   3.25%fnlc_FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFive
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
           
Securities Sold under Agreements to Repurchase, Stated Rate 1.89%fnlc_SecuritiesSoldunderAgreementstoRepurchaseStatedRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
1.89%fnlc_SecuritiesSoldunderAgreementstoRepurchaseStatedRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember