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Loans - Loan Portfolio (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Schedule of Financing Receivables [Line Items] |  |  |
Loans | $ 939,169us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 917,564us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome | $ 868,914us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Percentage of loans receivable, by type | 100.00%fnlc_PercentageOfLoansReceivableByType | 100.00%fnlc_PercentageOfLoansReceivableByType | 100.00%fnlc_PercentageOfLoansReceivableByType
Commercial real estate |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 242,021us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 242,311us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 240,187us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Percentage of loans receivable, by type | 25.80%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 26.40%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 27.70%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 34,683us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 30,932us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 21,686us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Percentage of loans receivable, by type | 3.70%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 3.40%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 2.50%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Commercial other |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 115,455us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 104,531us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 97,276us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Percentage of loans receivable, by type | 12.30%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 11.40%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 11.20%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Municipal |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 26,277us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 20,424us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 17,790us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember
Percentage of loans receivable, by type | 2.80%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 2.20%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 2.00%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember
Residential term |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 383,869us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 384,032us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 372,479us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember
Percentage of loans receivable, by type | 40.80%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 41.90%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember | 42.90%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialTermMember
Residential construction |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 13,036us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember | 12,160us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember | 12,360us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember
Percentage of loans receivable, by type | 1.40%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember | 1.30%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember | 1.40%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_ResidentialConstructionMember
Home equity line of credit |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | 104,100us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 103,521us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 92,202us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember
Percentage of loans receivable, by type | 11.10%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 11.30%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember | 10.60%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityMember
Consumer |  |  |
Schedule of Financing Receivables [Line Items] |  |  |
Loans | $ 19,728us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 19,653us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | $ 14,934us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember
Percentage of loans receivable, by type | 2.10%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 2.10%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember | 1.70%fnlc_PercentageOfLoansReceivableByType / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerPortfolioSegmentMember

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- Definition Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio. + References No definition available. + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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