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Allowance for Loan Losses Narrative (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance for Loan and Lease Losses, Related Loans, Percentage 0.41%fnlc_AllowanceforLoanandLeaseLossesRelatedLoansPercentage 0.39%fnlc_AllowanceforLoanandLeaseLossesRelatedLoansPercentage    
Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease) $ 208fnlc_AllowanceforLoanandLeaseLossesRelatedLoansPeriodIncreaseDecrease $ 208fnlc_AllowanceforLoanandLeaseLossesRelatedLoansPeriodIncreaseDecrease    
Less allowance for loan losses 10,196us-gaap_LoansAndLeasesReceivableAllowance 10,344us-gaap_LoansAndLeasesReceivableAllowance 11,655us-gaap_LoansAndLeasesReceivableAllowance 11,514us-gaap_LoansAndLeasesReceivableAllowance
Allowance for loan losses as a percent of total loans 1.09%fnlc_AllowanceforLoanLossesofTotalLoansPercentage 1.13%fnlc_AllowanceforLoanLossesofTotalLoansPercentage 1.34%fnlc_AllowanceforLoanLossesofTotalLoansPercentage  
Loan value, lower range 75.00%fnlc_ResidentialLoansTypicalLoanToValueRangeLow      
Construction loans accrual to company capital 34.10%fnlc_ConstructionLoansActualLoanPortfolioToCompanyCapital      
Constructions loan portfolio maximum to company capital 100.00%fnlc_ConstructionLoanPortfolioMaximumToCompanyCapital      
Construction and non owner occupied commercial real estate 97.30%fnlc_ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansPortfolioToCompanyCapital      
Construction And Non Owner Occupied Commercial Real Estate Loans Maximum Loan Portfolio To Company Capital 300.00%fnlc_ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansMaximumLoanPortfolioToCompanyCapital      
Outstanding loans and commitments subject by independent consulting firm 50.00%fnlc_OutstandingLoansAndCommitmentsSubjectByIndependentConsultingFirm      
Residential loans typical loan to value range, high 80.00%fnlc_ResidentialLoansTypicalLoanToValueRangeHigh      
Collateralized consumer loans to individuals loan to value maximum, lower range 80.00%fnlc_CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeLow      
Collateralized consumer loans to individuals loan to value maximum, higher range 90.00%fnlc_CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeHigh      
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Delinquent period before residential loans placed on non accrual status 120 days      
Residential construction        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Less allowance for loan losses 23us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnlc_ResidentialConstructionMember		 20us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnlc_ResidentialConstructionMember		 22us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnlc_ResidentialConstructionMember		 21us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnlc_ResidentialConstructionMember
Delinquent period before residential loans placed on non accrual status 90 days      
Unallocated Reserves        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Less allowance for loan losses $ 1,841us-gaap_LoansAndLeasesReceivableAllowance
/ fnlc_FinancingReceivableInformationByTypeOfReserveAxis
= fnlc_UnallocatedReservesMember		 $ 1,662us-gaap_LoansAndLeasesReceivableAllowance
/ fnlc_FinancingReceivableInformationByTypeOfReserveAxis
= fnlc_UnallocatedReservesMember		 $ 1,830us-gaap_LoansAndLeasesReceivableAllowance
/ fnlc_FinancingReceivableInformationByTypeOfReserveAxis
= fnlc_UnallocatedReservesMember		  
Percentage of Total Reserve Allowance accounted for by Loan Loss Allowances 18.10%fnlc_PercentageofTotalReserveAllowanceaccountedforbyLoanLossAllowances
/ fnlc_FinancingReceivableInformationByTypeOfReserveAxis
= fnlc_UnallocatedReservesMember		 16.10%fnlc_PercentageofTotalReserveAllowanceaccountedforbyLoanLossAllowances
/ fnlc_FinancingReceivableInformationByTypeOfReserveAxis
= fnlc_UnallocatedReservesMember