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Loans - TDR's by Class and Specific Reserves (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 loan | Mar. 31, 2014 loan | Dec. 31, 2014 loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 90us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 101us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 94us-gaap_FinancingReceivableModificationsNumberOfContracts2
Balance | $ 26,524us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 28,796us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 27,214us-gaap_FinancingReceivableModificationsRecordedInvestment
Specific Reserves | 695fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod | 1,246fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod | 868fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 17us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 20us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 19us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Balance | 11,831us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 12,925us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 12,282us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Specific Reserves | 133fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 520fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 267fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Balance | 1,172us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 1,284us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 1,172us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Specific Reserves | 189fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 277fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 207fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 13us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 19us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 15us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Balance | 1,789us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 2,300us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 2,007us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Specific Reserves | 0fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 103fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 0fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Residential term |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 54us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 56us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 54us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember
Balance | 10,917us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 11,450us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 10,932us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember
Specific Reserves | 351fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 346fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 373fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember
Home equity line of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of Loans | 5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 5us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember
Balance | 815us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 837us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 821us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember
Specific Reserves | $ 22fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | $ 0fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | $ 21fnlc_TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember

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