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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
limited_partnership
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
limited_partnership
Dec. 31, 2013
Dec. 31, 2012
Federal income tax                      
Current                 $ 4,282us-gaap_CurrentFederalTaxExpenseBenefit $ 3,234us-gaap_CurrentFederalTaxExpenseBenefit $ 3,239us-gaap_CurrentFederalTaxExpenseBenefit
Deferred                 18us-gaap_DeferredFederalIncomeTaxExpenseBenefit (56)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (108)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal income tax expense                 4,300us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 3,178us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 3,131us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State income tax [Abstract]                      
State franchise tax                 266us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 247us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 240us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Income tax expense 1,048us-gaap_IncomeTaxExpenseBenefit 1,400us-gaap_IncomeTaxExpenseBenefit 1,155us-gaap_IncomeTaxExpenseBenefit 963us-gaap_IncomeTaxExpenseBenefit 939us-gaap_IncomeTaxExpenseBenefit 955us-gaap_IncomeTaxExpenseBenefit 825us-gaap_IncomeTaxExpenseBenefit 706us-gaap_IncomeTaxExpenseBenefit 4,566us-gaap_IncomeTaxExpenseBenefit 3,425us-gaap_IncomeTaxExpenseBenefit 3,371us-gaap_IncomeTaxExpenseBenefit
Reconciliation between US expected tax rate and actual tax expense                      
Expected tax expense                 6,746us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,736us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 5,621us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Non-taxable income                 (2,292)us-gaap_IncomeTaxReconciliationTaxExemptIncome (2,326)us-gaap_IncomeTaxReconciliationTaxExemptIncome (2,096)us-gaap_IncomeTaxReconciliationTaxExemptIncome
State franchise tax, net of federal tax benefit                 173us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 160us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 156us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax credits                 (414)us-gaap_IncomeTaxReconciliationTaxCredits (414)us-gaap_IncomeTaxReconciliationTaxCredits (414)us-gaap_IncomeTaxReconciliationTaxCredits
Other                 353us-gaap_IncomeTaxReconciliationOtherAdjustments 269us-gaap_IncomeTaxReconciliationOtherAdjustments 104us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense 1,048us-gaap_IncomeTaxExpenseBenefit 1,400us-gaap_IncomeTaxExpenseBenefit 1,155us-gaap_IncomeTaxExpenseBenefit 963us-gaap_IncomeTaxExpenseBenefit 939us-gaap_IncomeTaxExpenseBenefit 955us-gaap_IncomeTaxExpenseBenefit 825us-gaap_IncomeTaxExpenseBenefit 706us-gaap_IncomeTaxExpenseBenefit 4,566us-gaap_IncomeTaxExpenseBenefit 3,425us-gaap_IncomeTaxExpenseBenefit 3,371us-gaap_IncomeTaxExpenseBenefit
Components of deferred tax assets and liabilities                      
Allowance for loan losses 3,620us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       4,030us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses       3,620us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 4,030us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
OREO 229fnlc_DeferredTaxAssetsOtherRealEstateOwned       116fnlc_DeferredTaxAssetsOtherRealEstateOwned       229fnlc_DeferredTaxAssetsOtherRealEstateOwned 116fnlc_DeferredTaxAssetsOtherRealEstateOwned  
Accrued pension and post-retirement 1,725fnlc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension       1,334fnlc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension       1,725fnlc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension 1,334fnlc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension  
Unrealized loss on securities available for sale 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross       3,549us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross       0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 3,549us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross  
Goodwill 138us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets       206us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets       138us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 206us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Unrealized loss on securities transferred from available for sale to held to maturity 26fnlc_DeferredTaxAssetSecuritiesTransferedfromAFStoHTM       0fnlc_DeferredTaxAssetSecuritiesTransferedfromAFStoHTM       26fnlc_DeferredTaxAssetSecuritiesTransferedfromAFStoHTM 0fnlc_DeferredTaxAssetSecuritiesTransferedfromAFStoHTM  
Tax credits, carried forward 0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards       539us-gaap_DeferredTaxAssetsTaxCreditCarryforwards       0us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 539us-gaap_DeferredTaxAssetsTaxCreditCarryforwards  
Restricted stock grants 264fnlc_DeferredTaxAssetRestrictedStockGrants       113fnlc_DeferredTaxAssetRestrictedStockGrants       264fnlc_DeferredTaxAssetRestrictedStockGrants 113fnlc_DeferredTaxAssetRestrictedStockGrants  
Core deposit intangible 5fnlc_DeferredTaxAssetIntangibleLiabilities       0fnlc_DeferredTaxAssetIntangibleLiabilities       5fnlc_DeferredTaxAssetIntangibleLiabilities 0fnlc_DeferredTaxAssetIntangibleLiabilities  
Other assets 48us-gaap_DeferredTaxAssetsOther       50us-gaap_DeferredTaxAssetsOther       48us-gaap_DeferredTaxAssetsOther 50us-gaap_DeferredTaxAssetsOther  
Total deferred tax asset 6,055us-gaap_DeferredTaxAssetsNet       9,937us-gaap_DeferredTaxAssetsNet       6,055us-gaap_DeferredTaxAssetsNet 9,937us-gaap_DeferredTaxAssetsNet  
Net deferred loan costs (1,120)us-gaap_DeferredTaxLiabilitiesFinancingArrangements       (884)us-gaap_DeferredTaxLiabilitiesFinancingArrangements       (1,120)us-gaap_DeferredTaxLiabilitiesFinancingArrangements (884)us-gaap_DeferredTaxLiabilitiesFinancingArrangements  
Depreciation (2,131)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (2,672)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment       (2,131)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,672)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Available-for-Sale Securities, Accumulated Gross Unrealized Loss, before Tax (1,358)fnlc_AvailableforSaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax       0fnlc_AvailableforSaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax       (1,358)fnlc_AvailableforSaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax 0fnlc_AvailableforSaleSecuritiesAccumulatedGrossUnrealizedLossbeforeTax  
Mortgage servicing rights (380)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights       (405)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights       (380)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights (405)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights  
Core deposit intangible 0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets       (99)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets       0us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (99)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Investment in flow through entities 387fnlc_Investmentinflowthroughentities       361fnlc_Investmentinflowthroughentities       387fnlc_Investmentinflowthroughentities 361fnlc_Investmentinflowthroughentities  
Deferred Tax Liabilities, Prepaid Expenses 210us-gaap_DeferredTaxLiabilitiesPrepaidExpenses       316us-gaap_DeferredTaxLiabilitiesPrepaidExpenses       210us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 316us-gaap_DeferredTaxLiabilitiesPrepaidExpenses  
Total deferred tax liability (5,586)us-gaap_DeferredTaxLiabilities       (4,737)us-gaap_DeferredTaxLiabilities       (5,586)us-gaap_DeferredTaxLiabilities (4,737)us-gaap_DeferredTaxLiabilities  
Net deferred tax asset 469us-gaap_DeferredTaxAssetsLiabilitiesNet       5,200us-gaap_DeferredTaxAssetsLiabilitiesNet       469us-gaap_DeferredTaxAssetsLiabilitiesNet 5,200us-gaap_DeferredTaxAssetsLiabilitiesNet  
Limited partnerships                      
Limited partnerships held as investments 2fnlc_LimitedPartnershipsHeldAsInvestments               2fnlc_LimitedPartnershipsHeldAsInvestments    
Tax credits from investments in limited partnerships                 636us-gaap_IncomeTaxReconciliationTaxCreditsInvestment 636us-gaap_IncomeTaxReconciliationTaxCreditsInvestment  
Amortization of investments in limited partnerships                 569us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization 520us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization  
Carrying value of investments in limited partnerships 457us-gaap_LimitedPartnersCapitalAccount       1,026us-gaap_LimitedPartnersCapitalAccount       457us-gaap_LimitedPartnersCapitalAccount 1,026us-gaap_LimitedPartnersCapitalAccount  
Total exposure to limited partnerships $ 3,957fnlc_LimitedPartnershipEntityEntityMaximumLossExposureAmount       $ 4,526fnlc_LimitedPartnershipEntityEntityMaximumLossExposureAmount       $ 3,957fnlc_LimitedPartnershipEntityEntityMaximumLossExposureAmount $ 4,526fnlc_LimitedPartnershipEntityEntityMaximumLossExposureAmount