XML 28 R52.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Allowance for Loan Losses - Risk Ratings by Segment (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | $ 418,436fnlc_CommercialAndMunicipalRiskRatedLoansReceivable | $ 398,198fnlc_CommercialAndMunicipalRiskRatedLoansReceivable | $ 376,939fnlc_CommercialAndMunicipalRiskRatedLoansReceivable
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 242,021fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 242,311fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 240,187fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 34,683fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 30,932fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember | 21,686fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember
Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 115,455fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 104,531fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember | 97,276fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember
Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 26,277fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 20,424fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember | 17,790fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember
1 Strong |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 355fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 342fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 276fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member
1 Strong | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 11fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 12fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 15fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member
1 Strong | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member
1 Strong | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 344fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 330fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 261fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member
1 Strong | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Strong1Member
2 Above Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 45,334fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 39,438fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 33,444fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member
2 Above Average | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 11,599fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 12,668fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 9,287fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member
2 Above Average | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 766fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 771fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 773fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member
2 Above Average | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 8,282fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 7,210fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 7,458fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member
2 Above Average | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 24,687fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 18,789fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member | 15,926fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_AboveAverage2Member
3 Satisfactory |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 81,403fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 78,125fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 64,726fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member
3 Satisfactory | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 52,828fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 50,275fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 44,918fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member
3 Satisfactory | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,227fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 1,983fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 1,080fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member
3 Satisfactory | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 24,758fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 24,232fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 16,864fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member
3 Satisfactory | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,590fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 1,635fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member | 1,864fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Satisfactory3Member
4 Average |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 189,467fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 176,959fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 165,196fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member
4 Average | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 108,480fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 108,719fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 102,361fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member
4 Average | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 25,867fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 23,345fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 16,388fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member
4 Average | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 55,120fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 44,895fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 46,447fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member
4 Average | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Average4Member
5 Watch |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 57,025fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 56,712fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 43,907fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member
5 Watch | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 36,816fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 36,974fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 33,079fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member
5 Watch | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,567fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 1,567fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member
5 Watch | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 17,642fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 18,171fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 10,828fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member
5 Watch | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Watch5Member
6 OAEM |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 13,848fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 14,335fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 33,502fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member
6 OAEM | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 9,670fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 9,846fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 26,951fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member
6 OAEM | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 2,509fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 2,519fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 2,668fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member
6 OAEM | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 1,669fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 1,970fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 3,883fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member
6 OAEM | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = fnlc_Oaem6Member
7 Substandard |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 31,004fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 32,287fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 35,848fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
7 Substandard | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 22,617fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 23,817fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 23,576fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
7 Substandard | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 747fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 747fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 777fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
7 Substandard | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 7,640fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 7,723fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 11,495fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
7 Substandard | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_MunicipalMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
8 Doubtful |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 40fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
8 Doubtful | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
8 Doubtful | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialConstructionMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
8 Doubtful | Commercial other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Commercial and municipal risk-rated loans receivable | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 0fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember | 40fnlc_CommercialAndMunicipalRiskRatedLoansReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fnlc_CommercialOtherMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_DoubtfulMember
8 Doubtful | Municipal |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
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