$FNLC
First Bancorp, Inc /ME/ Stock $fnlc

$fnlc Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000076520720000010 Filed on March 06, 2020

Income Statement

Concept	2019 Q4	2018 Q4	2018 Q3
Revenue	$19.66M	$18.80M	$18.09M
YoY Change	4.55%	18.83%	16.56%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$540.0K	$440.0K	$440.0K
YoY Change	22.73%	-8.33%	-6.38%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$6.239M	$5.806M	$5.550M
YoY Change	7.46%	60.65%	55.77%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$7.947M	$7.585M	$7.021M
YoY Change	4.77%	10.44%	5.04%
Income Tax	$1.261M	$1.222M	$1.088M
% Of Pretax Income	15.87%	16.11%	15.5%
Net Earnings	$6.686M	$6.363M	$5.933M
YoY Change	5.08%	25.11%	19.09%
Net Earnings / Revenue	34.01%	33.84%	32.8%
Basic Earnings Per Share	$0.62	$0.59	$0.55
Diluted Earnings Per Share	$0.60	$0.58	$0.55
COMMON SHARES
Basic Shares Outstanding	10.90M shares	10.86M shares	10.79M shares
Diluted Shares Outstanding			10.86M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$14.43M	$19.13M	$21.65M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$21.31M	$22.06M	$21.45M
YoY Change	-3.4%	-1.98%	-1.29%
Goodwill	$29.81M	$29.81M	$29.81M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.069B	$1.945B	$1.982B
YoY Change	6.39%	5.52%	11.23%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses
YoY Change
Deferred Revenue
YoY Change
Short-Term Debt	$174.9M	$145.2M	$200.2M
YoY Change	20.42%	27.78%	67.91%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$37.50M	$40.20M
YoY Change	-6.72%	-43.06%
LONG-TERM LIABILITIES
Long-Term Debt	$0.00	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$20.90M	$15.60M	$17.00M
YoY Change	33.97%	11.43%	-2.3%
Total Long-Term Liabilities	$20.90M	$15.60M	$17.00M
YoY Change	33.97%	11.43%	-2.3%
TOTAL LIABILITIES
Total Short-Term Liabilities	$37.50M	$40.20M
Total Long-Term Liabilities	$20.90M	$15.60M	$17.00M
Total Liabilities	$1.856B	$1.753B	$1.797B
YoY Change	5.89%	5.5%	12.2%
SHAREHOLDERS EQUITY
Retained Earnings	$144.8M	$132.5M	$129.2M
YoY Change	9.35%	9.34%	9.2%
Common Stock	$109.0K	$109.0K	$109.0K
YoY Change	0.0%	0.93%	0.93%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$212.5M	$191.5M	$184.7M
YoY Change
Total Liabilities & Shareholders Equity	$2.069B	$1.945B	$1.982B
YoY Change	6.39%	5.52%	11.23%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018 Q3
OPERATING ACTIVITIES
Net Income	$6.686M	$6.363M	$5.933M
YoY Change	5.08%	25.11%	19.09%
Depreciation, Depletion And Amortization	$540.0K	$440.0K	$440.0K
YoY Change	22.73%	-8.33%	-6.38%
Cash From Operating Activities	$11.62M	$9.550M	$6.060M
YoY Change	21.68%	123.65%	-31.29%
INVESTING ACTIVITIES
Capital Expenditures	-$610.0K	-$1.050M	-$210.0K
YoY Change	-41.9%	-35.19%	-74.7%
Acquisitions
YoY Change
Other Investing Activities	-$45.41M	$35.32M	-$68.34M
YoY Change	-228.57%	-157.36%	-594.86%
Cash From Investing Activities	-$46.02M	$34.26M	-$68.55M
YoY Change	-234.33%	-154.21%	-628.12%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	27.41M	-46.33M	63.09M
YoY Change	-159.16%	-183.09%	-421.72%
NET CHANGE
Cash From Operating Activities	11.62M	9.550M	6.060M
Cash From Investing Activities	-46.02M	34.26M	-68.55M
Cash From Financing Activities	27.41M	-46.33M	63.09M
Net Change In Cash	-6.990M	-2.520M	600.0K
YoY Change	177.38%	-20.5%	-72.6%
FREE CASH FLOW
Cash From Operating Activities	$11.62M	$9.550M	$6.060M
Capital Expenditures	-$610.0K	-$1.050M	-$210.0K
Free Cash Flow	$12.23M	$10.60M	$6.270M
YoY Change	15.38%	79.97%	-35.03%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000765207
CY2019Q4	fnlc	Defined Contribution Plan Employer Maximum Percentage Match Of Employee Annual Salary DefinedContributionPlanEmployerMaximumPercentageMatchOfEmployeeAnnualSalary	0.03
CY2017Q4	fnlc	Defined Contribution Plan Employer Maximum Profit Sharing Contributions DefinedContributionPlanEmployerMaximumProfitSharingContributions	0.02
CY2018Q4	fnlc	Defined Contribution Plan Employer Maximum Profit Sharing Contributions DefinedContributionPlanEmployerMaximumProfitSharingContributions	0.02
CY2019	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Due Thereafter FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueThereafter	0.0000
CY2019	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Duein Year Five FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFive	0.0000
CY2018	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Duein Year Three FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree	0.0155
CY2019	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Duein Year Four FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearFour	0.0000
CY2019	fnlc	Post Employment Plan Supplemental Benefits Payment Period Upon Retirement Or Death PostEmploymentPlanSupplementalBenefitsPaymentPeriodUponRetirementOrDeath	P20Y
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Duein Year Three FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearThree	0.0000
CY2019	fnlc	Federal Home Loan Bank Advances Interest Rate Maturities Summary Duein Year Two FederalHomeLoanBankAdvancesInterestRateMaturitiesSummaryDueinYearTwo	0.0155
CY2017	fnlc	Interest Incomeand Feeson Loans Tax Exempt InterestIncomeandFeesonLoansTaxExempt	798000	USD
CY2018	fnlc	Interest Incomeand Feeson Loans Tax Exempt InterestIncomeandFeesonLoansTaxExempt	1157000	USD
CY2019	fnlc	Interest Incomeand Feeson Loans Tax Exempt InterestIncomeandFeesonLoansTaxExempt	1302000	USD
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CY2019	us-gaap	Interest Income Securities Tax Exempt InterestIncomeSecuritiesTaxExempt	7333000	USD
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Entity File Number EntityFileNumber	0-26589
CY2019	dei	Entity Registrant Name EntityRegistrantName	FIRST BANCORP, INC
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	ME
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	01-0404322
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	223 Main Street
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	Damariscotta
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	ME
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	04543
CY2019	dei	City Area Code CityAreaCode	207
CY2019	dei	Local Phone Number LocalPhoneNumber	563-3195
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CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	43000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	43000	USD
CY2019	us-gaap	Other Noninterest Expense OtherNoninterestExpense	9746000	USD
CY2018	us-gaap	Other Noninterest Expense OtherNoninterestExpense	8198000	USD
CY2017	us-gaap	Other Noninterest Expense OtherNoninterestExpense	7918000	USD
CY2019	us-gaap	Noninterest Expense NoninterestExpense	35172000	USD
CY2018	us-gaap	Noninterest Expense NoninterestExpense	33467000	USD
CY2017	us-gaap	Noninterest Expense NoninterestExpense	31651000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	30260000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	27842000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	26200000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4735000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4306000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6612000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25525000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	23536000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	19588000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.36
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.34
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.17
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8708000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2150000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1452000	USD
CY2019	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	15000	USD
CY2018	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-23000	USD
CY2017	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-14000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-1341000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-106000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	107000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	13000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	-184000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	19000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7369000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2095000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1378000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	32894000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	21441000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	18210000	USD
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	172521000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	19588000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1452000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	107000	USD
CY2017	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-14000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	19000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	18210000	USD
CY2017	us-gaap	Dividends Cash DividendsCash	10280000	USD
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	392000	USD
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	154000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	0	USD
CY2017	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2017	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	632000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	181321000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	23536000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-2150000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-106000	USD
CY2018	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-23000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-184000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	21441000	USD
CY2018	us-gaap	Dividends Cash DividendsCash	12052000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	381000	USD
CY2018	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	168000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2018	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	619000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	191542000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	191542000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25525000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	8708000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-1341000	USD
CY2019	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	15000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	32894000	USD
CY2019	us-gaap	Dividends Cash DividendsCash	12963000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	565000	USD
CY2019	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	183000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2019	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	653000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	212508000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25525000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	23536000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	19588000	USD
CY2019	us-gaap	Depreciation Depreciation	1938000	USD
CY2018	us-gaap	Depreciation Depreciation	1792000	USD
CY2017	us-gaap	Depreciation Depreciation	1864000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	336000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-485000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	2083000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1250000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1500000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2000000	USD
CY2019	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	37721000	USD
CY2018	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	25447000	USD
CY2017	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	39039000	USD
CY2019	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	38218000	USD
CY2018	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	26323000	USD
CY2017	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	40172000	USD
CY2019	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	651000	USD
CY2018	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	490000	USD
CY2017	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	737000	USD
CY2019	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	224000	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	137000	USD
CY2017	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	471000	USD
CY2019	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1082000	USD
CY2018	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1820000	USD
CY2017	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-3212000	USD
CY2019	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	113000	USD
CY2018	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	312000	USD
CY2017	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	84000	USD
CY2019	us-gaap	Provision For Other Losses ProvisionForOtherLosses	0	USD
CY2018	us-gaap	Provision For Other Losses ProvisionForOtherLosses	0	USD
CY2017	us-gaap	Provision For Other Losses ProvisionForOtherLosses	17000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	565000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	381000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	392000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7690000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-1146000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4817000	USD
CY2019	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	307000	USD
CY2018	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	186000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	78825000	USD
CY2017	us-gaap	Other Depreciation And Amortization OtherDepreciationAndAmortization	178000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	51752000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	156969000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2802000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	3848000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2020000	USD
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-386000	USD
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-136000	USD
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	108000	USD
CY2019	us-gaap	Amortization Of Acquisition Costs AmortizationOfAcquisitionCosts	43000	USD
CY2018	us-gaap	Amortization Of Acquisition Costs AmortizationOfAcquisitionCosts	43000	USD
CY2017	us-gaap	Amortization Of Acquisition Costs AmortizationOfAcquisitionCosts	43000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	26053000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	33840000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	22273000	USD
CY2019	fnlc	Interest Interest Bearing Deposits In Other Banks Interest-InterestBearingDepositsInOtherBanks	-769000	USD
CY2018	fnlc	Interest Interest Bearing Deposits In Other Banks Interest-InterestBearingDepositsInOtherBanks	11219000	USD
CY2017	fnlc	Interest Interest Bearing Deposits In Other Banks Interest-InterestBearingDepositsInOtherBanks	567000	USD
CY2019	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	8339000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	459000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	15587000	USD
CY2019	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	24087000	USD
CY2018	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	14094000	USD
CY2017	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	14770000	USD
CY2019	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	418000	USD
CY2018	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	1350000	USD
CY2017	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	607000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	98257000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	76893000	USD
CY2017	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	177409000	USD
CY2019	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	71857000	USD
CY2018	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	13159000	USD
CY2017	us-gaap	Payments To Acquire Held To Maturity Securities PaymentsToAcquireHeldToMaturitySecurities	44334000	USD
CY2019	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2018	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	1228000	USD
CY2017	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	0	USD
CY2019	fnlc	Redemption Of Restricted Equity Securities RedemptionOfRestrictedEquitySecurities	2604000	USD
CY2018	fnlc	Redemption Of Restricted Equity Securities RedemptionOfRestrictedEquitySecurities	0	USD
CY2017	fnlc	Redemption Of Restricted Equity Securities RedemptionOfRestrictedEquitySecurities	1572000	USD
CY2019	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	59635000	USD
CY2018	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	75751000	USD
CY2017	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	95199000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1573000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1484000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2529000	USD
CY2019	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	0	USD
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2000	USD
CY2017	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	473000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-116280000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-112077000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-130060000	USD
CY2019	fnlc	Increase Decreasein Demand Deposits Savings Depositsand Money Market Accounts IncreaseDecreaseinDemandDepositsSavingsDepositsandMoneyMarketAccounts	24811000	USD
CY2018	fnlc	Increase Decreasein Demand Deposits Savings Depositsand Money Market Accounts IncreaseDecreaseinDemandDepositsSavingsDepositsandMoneyMarketAccounts	75798000	USD
CY2017	fnlc	Increase Decreasein Demand Deposits Savings Depositsand Money Market Accounts IncreaseDecreaseinDemandDepositsSavingsDepositsandMoneyMarketAccounts	88372000	USD
CY2019	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	98570000	USD
CY2018	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	32408000	USD
CY2017	us-gaap	Increase Decrease In Time Deposits IncreaseDecreaseInTimeDeposits	82381000	USD
CY2019	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	50000000	USD
CY2019	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	25362000	USD
CY2018	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	80000000	USD
CY2017	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	70000000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	61559000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-30143000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	183000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	168000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	154000	USD
CY2019	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	653000	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	619000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	632000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	12963000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	12052000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	11460000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	85526000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	78164000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14433000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	109628000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-4701000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-73000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1841000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19134000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19207000	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	17366000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19134000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	19207000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	26088000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	20104000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	13366000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	3994000	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	3057000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	5730000	USD
CY2019	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	0	USD
CY2018	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	610000	USD
CY2017	us-gaap	Transfer Of Other Real Estate TransferOfOtherRealEstate	1177000	USD
CY2019	us-gaap	Use Of Estimates UseOfEstimates	<div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates in Preparation of Financial Statements</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">In preparing the financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"), Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the balance sheet and revenues and expenses for the reporting period. Actual results could differ significantly from those estimates. Material estimates that are particularly susceptible to significant change in the near-term relate to the determination of the allowance for loan losses, goodwill, the valuation of mortgage servicing rights, and other-than-temporary impairment of securities.</span></div>
CY2019	us-gaap	Derivatives Methods Of Accounting Hedging Derivatives DerivativesMethodsOfAccountingHedgingDerivatives	<div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Derivative Financial Instruments Designated as Hedges</span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">The Bank recognizes all derivatives in the consolidated balance sheets at fair value. On the date the Bank enters into the derivative contract, the Bank designates the derivative as a hedge of either a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”), a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”), or a held for trading instrument (“trading instrument”). The Bank formally documents relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. The Bank also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are effective in offsetting changes in cash flows or fair values of hedged items. Changes in fair value of a derivative that is effective and that qualifies as a cash flow hedge are recorded in other comprehensive income (loss) and are reclassified into earnings when the forecasted transaction or related cash flows affect earnings. Changes in fair value of a derivative that qualifies as a fair value hedge and the change in fair value of the hedged item are both </span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">recorded in earnings and offset each other when the transaction is effective. Those derivatives that are classified as trading instruments are recorded at fair value with changes in fair value recorded in earnings. The Bank discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the cash flows of the hedged item, that it is unlikely that the forecasted transaction will occur, or that the designation of the derivative as a hedging instrument is no longer appropriate.</span></div>
CY2019	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P10Y
CY2017Q4	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Asset Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpense	-134000	USD
CY2019	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	segment
CY2019Q4	us-gaap	Compensating Balance Amount CompensatingBalanceAmount	500000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	3147000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	355890000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5565000	USD
CY2019Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	935000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	360520000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	281606000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	5590000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	151000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	287045000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7945000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7945000	USD
CY2019Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	1037000	USD
CY2019Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	1037000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	8982000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	8982000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	323809000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	578000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	6971000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	317416000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	255663000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	1382000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	6145000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	250900000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10549000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10549000	USD
CY2018Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	1037000	USD
CY2018Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	1037000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11586000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	11586000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	127000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	127000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	1334000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	1338000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	36534000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	36778000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	25860000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	26323000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	93134000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	95014000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	179133000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	182834000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	226095000	USD
CY2019Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	228601000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	75279000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	76550000	USD
CY2019Q4	fnlc	Debt Securities Availableforsale Amortized Costand Equity Securities DebtSecuritiesAvailableforsaleAmortizedCostandEquitySecurities	355890000	USD
CY2019Q4	fnlc	Debt Securities Availableforsaleand Equity Securities DebtSecuritiesAvailableforsaleandEquitySecurities	360520000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount	1432000	USD
CY2019Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	281606000	USD
CY2019Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	287045000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	0	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	0	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount	157544000	USD
CY2018	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	459000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities Within One Year Fair Value HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue	1433000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	13501000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	13518000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount	20717000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After One Through Five Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	20778000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	83954000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	83326000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After Five Through Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	155313000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	226354000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	220572000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Net Carrying Amount HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount	75970000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Debt Maturities After Ten Years Fair Value HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue	73376000	USD
CY2018Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	323809000	USD
CY2018Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	317416000	USD
CY2018Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	255663000	USD
CY2018Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	250900000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	9229000	USD
CY2017	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	15587000	USD
CY2019	fnlc	Debt Securities Realized Gain DebtSecuritiesRealizedGain	224000	USD
CY2018	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	137000	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	471000	USD
CY2019	fnlc	Debt Securities Realized Loss DebtSecuritiesRealizedLoss	0	USD
CY2018	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2017	us-gaap	Available For Sale Securities Gross Realized Losses AvailableForSaleSecuritiesGrossRealizedLosses	0	USD
CY2019	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	224000	USD
CY2018	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	137000	USD
CY2017	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	471000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	47000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	29000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	165000	USD
CY2019Q4	fnlc	Number Of Securities Temporarily Impaired NumberOfSecuritiesTemporarilyImpaired	86	security
CY2019Q4	fnlc	Number Of Securities Temporarily Impaired Twelve Months NumberOfSecuritiesTemporarilyImpairedTwelveMonths	28	security
CY2019	fnlc	Length Of Time Securities Temporarily Impaired LengthOfTimeSecuritiesTemporarilyImpaired	P12M
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	77148000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	588000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	19000000	USD
CY2014Q3	fnlc	Availablefor Sale Securities Transferred Securityat Fair Value AvailableforSaleSecuritiesTransferredSecurityatFairValue	89757000	USD
CY2014Q3	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Accumulated Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesAccumulatedUnrealizedGainLoss	-15000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	498000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	96148000	USD
CY2019Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1086000	USD
CY2018Q4	fnlc	Number Of Securities Temporarily Impaired NumberOfSecuritiesTemporarilyImpaired	511	security
CY2018Q4	fnlc	Number Of Securities Temporarily Impaired Twelve Months NumberOfSecuritiesTemporarilyImpairedTwelveMonths	232	security
CY2018	fnlc	Length Of Time Securities Temporarily Impaired LengthOfTimeSecuritiesTemporarilyImpaired	P12M
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	152859000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	2845000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	240871000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	10271000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	393730000	USD
CY2018Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	13116000	USD
CY2019Q4	fnlc	Availablefor Sale Securities Transferred Securityat Carrying Value AvailableforSaleSecuritiesTransferredSecurityatCarryingValue	24900000	USD
CY2019Q4	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Accumulated Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesAccumulatedUnrealizedGainLoss	1600000	USD
CY2019Q4	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	4300000	USD
CY2019Q4	us-gaap	Debt Securities Gain Loss DebtSecuritiesGainLoss	209000	USD
CY2014Q3	fnlc	Availablefor Sale Securities Transferred Securityat Carrying Value AvailableforSaleSecuritiesTransferredSecurityatCarryingValue	89780000	USD
CY2019Q4	fnlc	Other Comprehensive Income Loss Accumulated Unrealized Gain Losson Transferof Availableforsale Securitiesto Heldtomaturity OtherComprehensiveIncomeLossAccumulatedUnrealizedGainLossonTransferofAvailableforsaleSecuritiestoHeldtomaturity	-182000	USD
CY2019Q4	fnlc	Number Of States In New England Where Fhlb Serve NumberOfStatesInNewEnglandWhereFhlbServe	6	state
CY2019Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	7945000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	10549000	USD
CY2019Q4	fnlc	Restricted Equity Securities Unrealized Losses RestrictedEquitySecuritiesUnrealizedLosses	0	USD
CY2019Q4	fnlc	Residential Mortgage Loans Serviced For Others Outstanding Principal ResidentialMortgageLoansServicedForOthersOutstandingPrincipal	266173000	USD
CY2018Q4	fnlc	Residential Mortgage Loans Serviced For Others Outstanding Principal ResidentialMortgageLoansServicedForOthersOutstandingPrincipal	261654000	USD
CY2019	fnlc	Net Gain From Sale Of Loans NetGainFromSaleOfLoans	651000	USD
CY2018	fnlc	Net Gain From Sale Of Loans NetGainFromSaleOfLoans	490000	USD
CY2017	fnlc	Net Gain From Sale Of Loans NetGainFromSaleOfLoans	737000	USD
CY2019	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	422000	USD
CY2019	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	231000	USD
CY2019Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2089000	USD
CY2018	us-gaap	Servicing Asset At Fair Value Additions ServicingAssetAtFairValueAdditions	291000	USD
CY2018	us-gaap	Amortization Of Mortgage Servicing Rights Ms Rs AmortizationOfMortgageServicingRightsMSRs	204000	USD
CY2018Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2586000	USD
CY2019	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.1320
CY2019	fnlc	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate Adjustment Factor ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRateAdjustmentFactor	0.0950
CY2018Q4	fnlc	Percentage Of Loans Receivable By Type PercentageOfLoansReceivableByType	1.000
CY2019Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	7419000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	6615000	USD
CY2019Q4	fnlc	Mortgage Servicing Rights Gross MortgageServicingRightsGross	6140000	USD
CY2018Q4	fnlc	Mortgage Servicing Rights Gross MortgageServicingRightsGross	5718000	USD
CY2019Q4	fnlc	Accumulated Amortization Mortgage Servicing Rights AccumulatedAmortizationMortgageServicingRights	4594000	USD
CY2018Q4	fnlc	Accumulated Amortization Mortgage Servicing Rights AccumulatedAmortizationMortgageServicingRights	4364000	USD
CY2019Q4	fnlc	Mortgage Servicing Rights Net MortgageServicingRightsNet	1546000	USD
CY2018Q4	fnlc	Mortgage Servicing Rights Net MortgageServicingRightsNet	1354000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1297075000	USD
CY2019Q4	fnlc	Percentage Of Loans Receivable By Type PercentageOfLoansReceivableByType	1.000
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1238283000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	296871000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	290138000	USD
CY2019Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	240133000	USD
CY2018Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	237152000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16649000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	14727000	USD
CY2019	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	906000	USD
CY2018	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	811000	USD
CY2017	us-gaap	Loans And Leases Receivable Impaired Interest Lost On Nonaccrual Loans LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	496000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1560000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	351000	USD
CY2019Q4	us-gaap	Due From Related Parties DueFromRelatedParties	35071000	USD
CY2018Q4	us-gaap	Due From Related Parties DueFromRelatedParties	34566000	USD
CY2018Q4	fnlc	Related Party Loan Receivable Aggregated Over60000 Dollars RelatedPartyLoanReceivableAggregatedOver60000Dollars	22149000	USD
CY2017Q4	fnlc	Related Party Loan Receivable Aggregated Over60000 Dollars RelatedPartyLoanReceivableAggregatedOver60000Dollars	22354000	USD
CY2019	fnlc	Loansand Leases Receivables Related Parties Additions Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesAdditionsAggregatedOver60000Dollars	521000	USD
CY2018	fnlc	Loansand Leases Receivables Related Parties Additions Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesAdditionsAggregatedOver60000Dollars	1341000	USD
CY2019	fnlc	Loansand Leases Receivables Related Parties Collections Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesCollectionsAggregatedOver60000Dollars	1536000	USD
CY2018	fnlc	Loansand Leases Receivables Related Parties Collections Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesCollectionsAggregatedOver60000Dollars	1192000	USD
CY2019	fnlc	Loansand Leases Receivables Related Parties Retired Director Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesRetiredDirectorAggregatedOver60000Dollars	0	USD
CY2018	fnlc	Loansand Leases Receivables Related Parties Retired Director Aggregated Over60000 Dollars LoansandLeasesReceivablesRelatedPartiesRetiredDirectorAggregatedOver60000Dollars	354000	USD
CY2019Q4	fnlc	Related Party Loan Receivable Aggregated Over60000 Dollars RelatedPartyLoanReceivableAggregatedOver60000Dollars	21134000	USD
CY2018Q4	fnlc	Related Party Loan Receivable Aggregated Over60000 Dollars RelatedPartyLoanReceivableAggregatedOver60000Dollars	22149000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	15017000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1282058000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1297075000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	1560000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Past Due FinancingReceivableRecordedInvestmentPastDue	13375000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Current FinancingReceivableRecordedInvestmentCurrent	1224908000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1238283000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	351000	USD
CY2019Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	16649000	USD
CY2018Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	14727000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	31557000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	31805000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	29108000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	735000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	864000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	784000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	29274000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	31751000	USD
CY2019Q4	fnlc	Impaired Financing Receivable With No Allowance ImpairedFinancingReceivableWithNoAllowance	18212000	USD
CY2018Q4	fnlc	Impaired Financing Receivable With No Allowance ImpairedFinancingReceivableWithNoAllowance	21030000	USD
CY2019Q4	fnlc	Impaired Financing Receivable With Allowance ImpairedFinancingReceivableWithAllowance	11062000	USD
CY2018Q4	fnlc	Impaired Financing Receivable With Allowance ImpairedFinancingReceivableWithAllowance	10721000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2213000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2308000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	18212000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	20330000	USD
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	20542000	USD
CY2019	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	593000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	11062000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	11848000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2213000	USD
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	11015000	USD
CY2019	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	142000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	29274000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	32178000	USD
CY2019Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2213000	USD
CY2019	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	31557000	USD
CY2019	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	735000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	21030000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	22831000	USD
CY2018	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	18776000	USD
CY2018	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	764000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	10721000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	11397000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2308000	USD
CY2018	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	13029000	USD
CY2018	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	100000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	31751000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	34228000	USD
CY2018Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	2308000	USD
CY2018	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	31805000	USD
CY2018	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	864000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	18023000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1812000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	19775000	USD
CY2017	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	19227000	USD
CY2017	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod	553000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	13369000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	13698000	USD
CY2017	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	9881000	USD
CY2017	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Cash Basis Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod	231000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	31392000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	33473000	USD
CY2017Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	1812000	USD
CY2017	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	29108000	USD
CY2017	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	784000	USD
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	81	loan
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	21424000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	76	loan
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	25222000	USD
CY2019	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	81	loan
CY2019Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	21424000	USD
CY2019Q4	fnlc	Troubled Debt Restructuring Loansand Leases Receivable Specific Allowance TroubledDebtRestructuringLoansandLeasesReceivableSpecificAllowance	1677000	USD
CY2018	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	76	loan
CY2018Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	25222000	USD
CY2018Q4	fnlc	Troubled Debt Restructuring Loansand Leases Receivable Specific Allowance TroubledDebtRestructuringLoansandLeasesReceivableSpecificAllowance	1568000	USD
CY2019Q4	fnlc	Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In Tdr In Previous12 Months FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months	13	loan
CY2019Q4	fnlc	Financing Receivable Recorded Investment Greater Than30 Days Past Due FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue	1510000	USD
CY2019	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	2	loan
CY2019Q4	fnlc	Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In Tdr In Previous12 Months FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months	13	loan
CY2019Q4	fnlc	Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In Tdr In Previous12 Months FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDuePlacedInTDRInPrevious12Months	1510000	USD
CY2019Q4	fnlc	Financing Receivable Recorded Investment Greaterthan30 Days Past Due Placedin Td Rin Previous12 Months Specific Allowanceduring Period FinancingReceivableRecordedInvestmentGreaterthan30DaysPastDuePlacedinTDRinPrevious12MonthsSpecificAllowanceduringPeriod	217000	USD
CY2018Q4	fnlc	Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In Tdr In Previous12 Months FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months	9	loan
CY2018Q4	fnlc	Financing Receivable Recorded Investment Greater Than30 Days Past Due FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue	1013000	USD
CY2018	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2018Q4	fnlc	Financing Receivable Modifications Number Of Contracts Greater Than30 Days Past Due Place In Tdr In Previous12 Months FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months	9	loan
CY2018Q4	fnlc	Financing Receivable Recorded Investment Greater Than30 Days Past Due Placed In Tdr In Previous12 Months FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDuePlacedInTDRInPrevious12Months	1013000	USD
CY2018Q4	fnlc	Financing Receivable Recorded Investment Greaterthan30 Days Past Due Placedin Td Rin Previous12 Months Specific Allowanceduring Period FinancingReceivableRecordedInvestmentGreaterthan30DaysPastDuePlacedinTDRinPrevious12MonthsSpecificAllowanceduringPeriod	26000	USD
CY2019	fnlc	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	11	loan
CY2019	fnlc	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	11	loan
CY2019	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	1203000	USD
CY2019	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	1060000	USD
CY2019	fnlc	Troubled Debt Restructuring Loans And Leases Receivable Specific Allowance Current Period TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceCurrentPeriod	162000	USD
CY2018	fnlc	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	18	loan
CY2018	fnlc	Financing Receivable Modifications Number Of Contracts During Period FinancingReceivableModificationsNumberOfContractsDuringPeriod	18	loan
CY2018	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	9365000	USD
CY2018	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	9032000	USD
CY2018	fnlc	Troubled Debt Restructuring Loans And Leases Receivable Specific Allowance Current Period TroubledDebtRestructuringLoansAndLeasesReceivableSpecificAllowanceCurrentPeriod	1344000	USD
CY2019Q4	fnlc	Financing Receivable Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy	987000	USD
CY2019Q4	fnlc	Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatWereOnNonAccrualStatus	26	loan
CY2019Q4	fnlc	Financing Receivable Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatWereOnNonAccrualStatus	8799000	USD
CY2019Q4	fnlc	Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsInvolvedInForeclosure	2	loan
CY2019Q4	fnlc	Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure LoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInForeclosure	350000	USD
CY2019Q4	fnlc	Mortgage Loansin Processof Foreclosure Number MortgageLoansinProcessofForeclosureNumber	14	loan
CY2019Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1502000	USD
CY2018Q4	fnlc	Mortgage Loansin Processof Foreclosure Number MortgageLoansinProcessofForeclosureNumber	11	loan
CY2018Q4	us-gaap	Mortgage Loans In Process Of Foreclosure Amount MortgageLoansInProcessOfForeclosureAmount	1131000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2213000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2308000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	9426000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	8924000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11639000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11232000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11639000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11232000	USD
CY2019	fnlc	Allowancefor Loanand Lease Losses Related Loans Percentage AllowanceforLoanandLeaseLossesRelatedLoansPercentage	0.0048
CY2018	fnlc	Allowancefor Loanand Lease Losses Related Loans Percentage AllowanceforLoanandLeaseLossesRelatedLoansPercentage	0.0045
CY2019	fnlc	Allowancefor Loanand Lease Losses Related Loans Period Increase Decrease AllowanceforLoanandLeaseLossesRelatedLoansPeriodIncreaseDecrease	638000	USD
CY2019Q4	fnlc	Allowancefor Loan Lossesof Total Loans Percentage AllowanceforLoanLossesofTotalLoansPercentage	0.0090
CY2018Q4	fnlc	Allowancefor Loan Lossesof Total Loans Percentage AllowanceforLoanLossesofTotalLoansPercentage	0.0091
CY2019Q4	fnlc	Loansand Leases Receivable Commercial Numberof Loan Classes LoansandLeasesReceivableCommercialNumberofLoanClasses	3	loan_class
CY2019Q4	fnlc	Commercial Real Estate Loans Maximum Loan To Value CommercialRealEstateLoansMaximumLoanToValue	0.80
CY2019Q4	fnlc	Loansand Leases Receivable Residential Numberof Loan Classes LoansandLeasesReceivableResidentialNumberofLoanClasses	2	loan_class
CY2019Q4	fnlc	Construction Loans Actual Loan Portfolio To Company Capital ConstructionLoansActualLoanPortfolioToCompanyCapital	0.279
CY2019Q4	fnlc	Construction Loan Portfolio Maximum To Company Capital ConstructionLoanPortfolioMaximumToCompanyCapital	1.000
CY2019Q4	fnlc	Construction And Non Owner Occupied Commercial Real Estate Loans Portfolio To Company Capital ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansPortfolioToCompanyCapital	1.230
CY2019Q4	fnlc	Construction And Non Owner Occupied Commercial Real Estate Loans Maximum Loan Portfolio To Company Capital ConstructionAndNonOwnerOccupiedCommercialRealEstateLoansMaximumLoanPortfolioToCompanyCapital	3.000
CY2019Q4	fnlc	Outstanding Loans And Commitments Subject By Independent Consulting Firm OutstandingLoansAndCommitmentsSubjectByIndependentConsultingFirm	0.60
CY2019Q4	fnlc	Commercial And Municipal Risk Rated Loans Receivable CommercialAndMunicipalRiskRatedLoansReceivable	670955000	USD
CY2018Q4	fnlc	Commercial And Municipal Risk Rated Loans Receivable CommercialAndMunicipalRiskRatedLoansReceivable	628066000	USD
CY2019Q4	fnlc	Loansand Leases Receivable Residential Numberof Loan Classes LoansandLeasesReceivableResidentialNumberofLoanClasses	2	loan_class
CY2019Q4	fnlc	Residential Loans Typical Loan To Value Range Low ResidentialLoansTypicalLoanToValueRangeLow	0.75
CY2019Q4	fnlc	Residential Loans Typical Loan To Value ResidentialLoansTypicalLoanToValue	0.80
CY2019Q4	fnlc	Collateralized Consumer Loans To Individuals Loan To Value CollateralizedConsumerLoansToIndividualsLoanToValue	0.80
CY2019Q4	fnlc	Collateralized Consumer Loans To Individuals Loan To Value Maximum Range High CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeHigh	0.90
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11232000	USD
CY2019	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1120000	USD
CY2019	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	277000	USD
CY2019	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1250000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11639000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2213000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	9426000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1297075000	USD
CY2018	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1273000	USD
CY2019Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	29274000	USD
CY2019Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1267801000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10729000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	22056000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Next Rolling Twelve Months FinanceLeaseLiabilityPaymentsDueInNextRollingTwelveMonths	129000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Two FinanceLeaseLiabilityPaymentsDueInRollingYearTwo	129000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Three FinanceLeaseLiabilityPaymentsDueInRollingYearThree	125000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Four FinanceLeaseLiabilityPaymentsDueInRollingYearFour	41000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling Year Five FinanceLeaseLiabilityPaymentsDueInRollingYearFive	16000	USD
CY2018	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	276000	USD
CY2018	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1500000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	11232000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	2308000	USD
CY2018Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	8924000	USD
CY2018Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1238283000	USD
CY2018Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	31751000	USD
CY2018Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1206532000	USD
CY2016Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10138000	USD
CY2017	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	1618000	USD
CY2017	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	209000	USD
CY2017	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	2000000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	10729000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	1812000	USD
CY2017Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	8917000	USD
CY2017Q4	us-gaap	Loans And Leases Receivable Net Of Deferred Income LoansAndLeasesReceivableNetOfDeferredIncome	1164139000	USD
CY2017Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	31392000	USD
CY2017Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1132747000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	41004000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	40719000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	19699000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	18663000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	21305000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due In Rolling After Year Five FinanceLeaseLiabilityPaymentsDueInRollingAfterYearFive	0	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	440000	USD
CY2019Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	279000	USD
CY2018Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	584000	USD
CY2018Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	0	USD
CY2017Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	53000	USD
CY2016Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	205000	USD
CY2019	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	0	USD
CY2018	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	53000	USD
CY2017	us-gaap	Real Estate Owned Valuation Allowance Amounts Applied RealEstateOwnedValuationAllowanceAmountsApplied	169000	USD
CY2019	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	0	USD
CY2018	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	0	USD
CY2017	us-gaap	Real Estate Owned Valuation Allowance Provision1 RealEstateOwnedValuationAllowanceProvision1	17000	USD
CY2019Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	0	USD
CY2018Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	0	USD
CY2017Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	53000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3978000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4407000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	4184000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	336000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-492000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	2083000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	4314000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	3915000	USD
CY2017	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	6267000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	421000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	391000	USD
CY2017	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	345000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4735000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4306000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6612000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	6355000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	5847000	USD
CY2017	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	9170000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1749000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	1699000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	2625000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	332000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	309000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	224000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-45000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-55000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	85000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2444000	USD
CY2017	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	-83000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	85000	USD
CY2017	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	88000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	0	USD
CY2017	us-gaap	Income Tax Reconciliation Change In Enacted Tax Rate IncomeTaxReconciliationChangeInEnactedTaxRate	134000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-73000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-11000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-120000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4735000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4306000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6612000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2359000	USD
CY2019Q4	fnlc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits And Pension DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension	926000	USD
CY2018Q4	fnlc	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits And Pension DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefitsAndPension	955000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	1343000	USD
CY2019Q4	fnlc	Deferred Tax Asset Securities Transferedfrom Af Sto Htm DeferredTaxAssetSecuritiesTransferedfromAFStoHTM	48000	USD
CY2018Q4	fnlc	Deferred Tax Asset Securities Transferedfrom Af Sto Htm DeferredTaxAssetSecuritiesTransferedfromAFStoHTM	52000	USD
CY2019Q4	fnlc	Deferred Tax Asset Restricted Stock Grants DeferredTaxAssetRestrictedStockGrants	203000	USD
CY2018Q4	fnlc	Deferred Tax Asset Restricted Stock Grants DeferredTaxAssetRestrictedStockGrants	170000	USD
CY2019Q4	fnlc	Deferred Tax Asset Intangible Liabilities DeferredTaxAssetIntangibleLiabilities	21000	USD
CY2018Q4	fnlc	Deferred Tax Asset Intangible Liabilities DeferredTaxAssetIntangibleLiabilities	18000	USD
CY2019Q4	fnlc	Deferred Tax Assets Investmentin Limited Partnership DeferredTaxAssetsInvestmentinLimitedPartnership	55000	USD
CY2018Q4	fnlc	Deferred Tax Assets Investmentin Limited Partnership DeferredTaxAssetsInvestmentinLimitedPartnership	31000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	0	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	24000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3697000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	4952000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	1669000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	1504000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1434000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	1300000	USD
CY2019Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax	972000	USD
CY2018Q4	us-gaap	Available For Sale Securities Accumulated Gross Unrealized Gain Loss Before Tax AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax	0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	120000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Goodwill DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill	80000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	325000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	205000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	159000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4751000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	3709000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Mortgage Servicing Rights DeferredTaxLiabilitiesMortgageServicingRights	284000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	26000	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Derivatives DeferredTaxLiabilitiesDerivatives	382000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1054000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	1243000	USD
CY2019Q4	fnlc	Limited Partnerships Held As Investments LimitedPartnershipsHeldAsInvestments	4	limited_partnership
CY2018Q4	fnlc	Limited Partnerships Held As Investments LimitedPartnershipsHeldAsInvestments	3	limited_partnership
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	330000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	210000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	307000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	186000	USD
CY2019Q4	us-gaap	Limited Partners Capital Account LimitedPartnersCapitalAccount	1951000	USD
CY2018Q4	us-gaap	Limited Partners Capital Account LimitedPartnersCapitalAccount	1408000	USD
CY2019Q4	fnlc	Limited Partnership Entity Entity Maximum Loss Exposure Amount LimitedPartnershipEntityEntityMaximumLossExposureAmount	1951000	USD
CY2018Q4	fnlc	Limited Partnership Entity Entity Maximum Loss Exposure Amount LimitedPartnershipEntityEntityMaximumLossExposureAmount	1408000	USD
CY2019Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	277225000	USD
CY2018Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	372464000	USD
CY2019Q4	fnlc	Time Deposits Greater Than100000 And Less Than250000 TimeDepositsGreaterThan100000AndLessThan250000	345241000	USD
CY2018Q4	fnlc	Time Deposits Greater Than100000 And Less Than250000 TimeDepositsGreaterThan100000AndLessThan250000	162185000	USD
CY2019Q4	fnlc	Time Deposits250000 Or More TimeDeposits250000OrMore	67513000	USD
CY2018Q4	fnlc	Time Deposits250000 Or More TimeDeposits250000OrMore	56760000	USD
CY2019Q4	us-gaap	Time Deposits TimeDeposits	689979000	USD
CY2018Q4	us-gaap	Time Deposits TimeDeposits	591409000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	507231000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	47291000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	53855000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	58180000	USD
CY2019Q4	us-gaap	Time Deposit Maturities Year Five TimeDepositMaturitiesYearFive	23271000	USD
CY2019Q4	us-gaap	Time Deposit Maturities After Year Five TimeDepositMaturitiesAfterYearFive	151000	USD
CY2019Q4	us-gaap	Time Deposits TimeDeposits	689979000	USD
CY2019	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	6060000	USD
CY2018	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	3038000	USD
CY2017	us-gaap	Interest Expense Time Deposits100000 Or More InterestExpenseTimeDeposits100000OrMore	2105000	USD
CY2019	us-gaap	Repurchase Agreements Maturities RepurchaseAgreementsMaturities	one to 365
CY2019Q4	fnlc	Line Of Credit With Correspondent Banks LineOfCreditWithCorrespondentBanks	51000000	USD
CY2019Q4	fnlc	Credit Facility With Federal Reserve Bank Of Boston CreditFacilityWithFederalReserveBankOfBoston	119000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	137400000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	10000000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	0	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Three To Four Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate	0	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Four To Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate	105000	USD
CY2019Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	0	USD
CY2019Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	147505000	USD
CY2019Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	37450000	USD
CY2019Q4	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	184955000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	105000000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From One To Two Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate	55000000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due From Two To Three Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate	10000000	USD
CY2018Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Five Years Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate	112000	USD
CY2018Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	170112000	USD
CY2018Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	40205000	USD
CY2018Q4	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	210317000	USD
CY2019Q4	fnlc	Defined Contribution Plan Employer Maximum Profit Sharing Contributions DefinedContributionPlanEmployerMaximumProfitSharingContributions	0.020
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	575000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	578000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	554000	USD
CY2019	us-gaap	Defined Benefit Plans General Information DefinedBenefitPlansGeneralInformation	The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years commencing upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a post-retirement plan.
CY2019	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	165000	USD
CY2018	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	176000	USD
CY2017	us-gaap	Pension And Other Postretirement Benefit Expense PensionAndOtherPostretirementBenefitExpense	219000	USD
CY2019Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	2828000	USD
CY2018Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	2949000	USD
CY2019Q4	fnlc	Number Of Post Retirement Benefit Plans NumberOfPostRetirementBenefitPlans	2	plan
CY2019Q4	fnlc	Number Of Active Employees Aged50 And Over NumberOfActiveEmployeesAged50AndOver	6	employee
CY2019	fnlc	Employee Benefit Plan Requisite Minimum Age EmployeeBenefitPlanRequisiteMinimumAge	P50Y
CY2019Q4	fnlc	Post Retirement Benefit Plan Health Insurance Subsidy Range Minimum PostRetirementBenefitPlanHealthInsuranceSubsidyRangeMinimum	40	USD
CY2019Q4	fnlc	Post Retirement Benefit Plan Health Insurance Subsidy Range Maximum PostRetirementBenefitPlanHealthInsuranceSubsidyRangeMaximum	1200	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1599000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1874000	USD
CY2016Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1870000	USD
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	66000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	77000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	77000	USD
CY2019	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	97000	USD
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	117000	USD
CY2017	us-gaap	Defined Benefit Plan Benefit Obligation Benefits Paid DefinedBenefitPlanBenefitObligationBenefitsPaid	113000	USD
CY2019Q4	fnlc	Actuarialgainloss Actuarialgainloss	13000	USD
CY2018Q4	fnlc	Actuarialgainloss Actuarialgainloss	-235000	USD
CY2017Q4	fnlc	Actuarialgainloss Actuarialgainloss	40000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1581000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-1646000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1599000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1874000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1581000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1599000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Benefit Obligation DefinedBenefitPlanBenefitObligation	1874000	USD
CY2019Q4	fnlc	Unamortized Prior Service Cost UnamortizedPriorServiceCost	-31000	USD
CY2018Q4	fnlc	Unamortized Prior Service Cost UnamortizedPriorServiceCost	-47000	USD
CY2017Q4	fnlc	Unamortized Prior Service Cost UnamortizedPriorServiceCost	186000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-1612000	USD
CY2017Q4	us-gaap	Defined Benefit Plan Funded Status Of Plan DefinedBenefitPlanFundedStatusOfPlan	-1688000	USD
CY2019Q4	fnlc	Weighted Average Discount Rate As Of December31 WeightedAverageDiscountRateAsOfDecember31	0.0300
CY2018Q4	fnlc	Weighted Average Discount Rate As Of December31 WeightedAverageDiscountRateAsOfDecember31	0.0425
CY2017Q4	fnlc	Weighted Average Discount Rate As Of December31 WeightedAverageDiscountRateAsOfDecember31	0.0425
CY2019	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	66000	USD
CY2018	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	77000	USD
CY2017	us-gaap	Defined Benefit Plan Interest Cost DefinedBenefitPlanInterestCost	77000	USD
CY2019	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2017	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses	0	USD
CY2019	fnlc	Defined Benefit Plan Other Settlement Expense DefinedBenefitPlanOtherSettlementExpense	2000	USD
CY2018	fnlc	Defined Benefit Plan Other Settlement Expense DefinedBenefitPlanOtherSettlementExpense	3000	USD
CY2017	fnlc	Defined Benefit Plan Other Settlement Expense DefinedBenefitPlanOtherSettlementExpense	-11000	USD
CY2019	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	64000	USD
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	74000	USD
CY2017	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost	88000	USD
CY2019	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0300
CY2018	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0425
CY2017	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Discount Rate DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate	0.0425
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	108000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	106000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	103000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	101000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	107000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	496000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Future Employer Contributions Remainder Of Fiscal Year DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear	64000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Of Gain Loss Next Fiscal Year DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear	158000	USD
CY2019Q4	fnlc	Accumulated Other Comprehensive Income Defined Benefit Plans Tax Deferred Tax Benefit AccumulatedOtherComprehensiveIncomeDefinedBenefitPlansTaxDeferredTaxBenefit	-7000	USD
CY2018Q4	fnlc	Accumulated Other Comprehensive Income Defined Benefit Plans Tax Deferred Tax Benefit AccumulatedOtherComprehensiveIncomeDefinedBenefitPlansTaxDeferredTaxBenefit	-10000	USD
CY2019	fnlc	Defined Benefit Plan Future Deferred Tax Benefit DefinedBenefitPlanFutureDeferredTaxBenefit	-33000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-24000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-37000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Expected Amortization Next Fiscal Year DefinedBenefitPlanExpectedAmortizationNextFiscalYear	125000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	31000	USD
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Gains Losses Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax	47000	USD
CY2016Q4	fnlc	Number Of Shares Available For Grant Under Employee Savings And Investment Plan NumberOfSharesAvailableForGrantUnderEmployeeSavingsAndInvestmentPlan	250000	shares
CY2019Q4	fnlc	Number Of Shares Issued Under Employee Savings And Investment Plan NumberOfSharesIssuedUnderEmployeeSavingsAndInvestmentPlan	52819	shares
CY2019Q4	fnlc	Number Of Shares Available For Future Use Under Employee Savings And Investment Plan NumberOfSharesAvailableForFutureUseUnderEmployeeSavingsAndInvestmentPlan	197181	shares
CY2017Q4	fnlc	Number Of Shares Available For Grant Under Employee Savings And Investment Plan NumberOfSharesAvailableForGrantUnderEmployeeSavingsAndInvestmentPlan	700000	shares
CY2019	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	13408	shares
CY2018	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	12138	shares
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	12762	shares
CY2001Q4	fnlc	Number Of Shares Registered Pursuant To Dividend Reinvestment Plan NumberOfSharesRegisteredPursuantToDividendReinvestmentPlan	600000	shares
	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	278526	shares
CY2019	fnlc	Stock Remainingunder Plan Shares Dividend Reinvestment Plan StockRemainingunderPlanSharesDividendReinvestmentPlan	321474	shares
CY2019	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	11242	shares
CY2018	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	9524	shares
CY2017	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	9922	shares
CY2010Q4	us-gaap	Common Stock Capital Shares Reserved For Future Issuance CommonStockCapitalSharesReservedForFutureIssuance	400000	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	162892	shares
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1570000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	565000	USD
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	600000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	381000	USD
CY2018Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	678000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	25525000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25525000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10815718	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.36
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	73591	shares
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	25525000	USD
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10889309	shares
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.34
CY2018	us-gaap	Net Income Loss NetIncomeLoss	23536000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	23536000	USD
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10783419	shares
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	69055	shares
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	23536000	USD
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10852474	shares
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.17
CY2017	us-gaap	Net Income Loss NetIncomeLoss	19588000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	19588000	USD
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	178773000	USD
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	10747306	shares
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.82
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	71712	shares
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	19588000	USD
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	10819018	shares
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.81
CY2019Q4	fnlc	Retained Earnings From Prior Two Years Available For Dividends RetainedEarningsFromPriorTwoYearsAvailableForDividends	26111000	USD
CY2019Q4	fnlc	Capital Conservation Buffer Phasein Minimum CapitalConservationBufferPhaseinMinimum	0.000
CY2015Q1	fnlc	Capital Conservation Buffer Phasein Maximum CapitalConservationBufferPhaseinMaximum	0.0250
CY2015Q1	fnlc	Capital Conservation Buffer Phasein Minimum CapitalConservationBufferPhaseinMinimum	0.0719
CY2019Q4	fnlc	Common Equity Tier One Risk Based Capital CommonEquityTierOneRiskBasedCapital	178773000	USD
CY2018Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	165117000	USD
CY2018Q4	fnlc	Common Equity Tier One Risk Based Capital CommonEquityTierOneRiskBasedCapital	165117000	USD
CY2018Q4	fnlc	Common Equity Tier One Capital Requiredfor Capital Adequacy Purposes CommonEquityTierOneCapitalRequiredforCapitalAdequacyPurposes	52252000	USD
CY2018Q4	fnlc	Common Equity Tier One Capitalto Risk Weighted Assets CommonEquityTierOneCapitaltoRiskWeightedAssets	0.1422
CY2018Q4	fnlc	Common Equity Tier One Risk Based Capital Requiredfor Capital Adequacyto Risk Weighted Assets CommonEquityTierOneRiskBasedCapitalRequiredforCapitalAdequacytoRiskWeightedAssets	0.0450
CY2019Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	195577000	USD
CY2018Q4	us-gaap	Fair Value Disclosure Offbalance Sheet Risks Amount Liability FairValueDisclosureOffbalanceSheetRisksAmountLiability	166312000	USD
CY2019Q4	us-gaap	Real Estate Owned Valuation Allowance RealEstateOwnedValuationAllowance	0	USD
CY2019Q4	fnlc	Impaired Financing Receivable Related Allowance Measuredat Fair Value ImpairedFinancingReceivableRelatedAllowanceMeasuredatFairValue	1916000	USD
CY2018Q4	fnlc	Impaired Financing Receivable Related Allowance Measuredat Fair Value ImpairedFinancingReceivableRelatedAllowanceMeasuredatFairValue	2096000	USD
CY2019	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1174000	USD
CY2018	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1165000	USD
CY2017	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1208000	USD
CY2019	us-gaap	Professional Fees ProfessionalFees	828000	USD
CY2018	us-gaap	Professional Fees ProfessionalFees	837000	USD
CY2017	us-gaap	Professional Fees ProfessionalFees	818000	USD
CY2019Q4	fnlc	Atm And Interchange Expense AtmAndInterchangeExpense	1176000	USD
CY2018Q4	fnlc	Atm And Interchange Expense AtmAndInterchangeExpense	995000	USD
CY2017Q4	fnlc	Atm And Interchange Expense AtmAndInterchangeExpense	886000	USD
CY2019	us-gaap	Loss Contingency Disclosures LossContingencyDisclosures	Legal Contingencies<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Various legal claims also arise from time to time in the normal course of business which, in the opinion of Management, will have no material effect on the Company's consolidated financial statements.</span></div>
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	Reclassifications<div style="line-height:120%;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;"><br/></span></div><div style="line-height:120%;text-align:left;font-size:10pt;"><span style="font-family:inherit;font-size:10pt;">Certain items from prior years were reclassified in the financial statements to conform with the current year presentation. These do not have a material impact on the balance sheet or statement of income presentations.</span></div>
CY2019Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	15270000	USD
CY2019Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	16918000	USD
CY2019Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	21418000	USD
CY2018Q1	us-gaap	Cash And Due From Banks CashAndDueFromBanks	16559000	USD
CY2018Q2	us-gaap	Cash And Due From Banks CashAndDueFromBanks	21056000	USD
CY2018Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	21649000	USD
CY2018Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	19134000	USD
CY2019Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	14433000	USD
CY2018Q1	us-gaap	Federal Funds Sold FederalFundsSold	280000	USD
CY2018Q2	us-gaap	Federal Funds Sold FederalFundsSold	1616000	USD
CY2018Q3	us-gaap	Federal Funds Sold FederalFundsSold	51045000	USD
CY2018Q4	us-gaap	Federal Funds Sold FederalFundsSold	12079000	USD
CY2019Q1	us-gaap	Federal Funds Sold FederalFundsSold	231000	USD
CY2019Q2	us-gaap	Federal Funds Sold FederalFundsSold	917000	USD
CY2019Q3	us-gaap	Federal Funds Sold FederalFundsSold	16714000	USD
CY2019Q4	us-gaap	Federal Funds Sold FederalFundsSold	11310000	USD
CY2018Q1	us-gaap	Investments Investments	562459000	USD
CY2018Q2	us-gaap	Investments Investments	565125000	USD
CY2018Q3	us-gaap	Investments Investments	562839000	USD
CY2018Q4	us-gaap	Investments Investments	573079000	USD
CY2019Q1	us-gaap	Investments Investments	606495000	USD
CY2019Q2	us-gaap	Investments Investments	625097000	USD
CY2019Q3	us-gaap	Investments Investments	625584000	USD
CY2019Q4	us-gaap	Investments Investments	642126000	USD
CY2018Q1	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	11947000	USD
CY2018Q2	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	12363000	USD
CY2018Q3	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	11586000	USD
CY2018Q4	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	11586000	USD
CY2019Q1	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	8982000	USD
CY2019Q2	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	8982000	USD
CY2019Q3	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	8982000	USD
CY2019Q4	fnlc	Federal Home Loan Bank And Federal Reserve Bank Stock At Cost FederalHomeLoanBankAndFederalReserveBankStockAtCost	8982000	USD
CY2018Q1	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1177329000	USD
CY2018Q2	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1213449000	USD
CY2018Q3	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1233010000	USD
CY2018Q4	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1227051000	USD
CY2019Q1	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1253585000	USD
CY2019Q2	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1237661000	USD
CY2019Q3	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1252546000	USD
CY2019Q4	fnlc	Loans And Lease Receivable Net LoansAndLeaseReceivableNet	1285590000	USD
CY2018Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	103241000	USD
CY2018Q2	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	100352000	USD
CY2018Q3	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	101725000	USD
CY2018Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	101641000	USD
CY2019Q1	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	106782000	USD
CY2019Q2	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	109124000	USD
CY2019Q3	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	107983000	USD
CY2019Q4	us-gaap	Other Assets Miscellaneous OtherAssetsMiscellaneous	106355000	USD
CY2018Q1	us-gaap	Assets Assets	1871815000	USD
CY2018Q2	us-gaap	Assets Assets	1913961000	USD
CY2018Q3	us-gaap	Assets Assets	1981854000	USD
CY2018Q4	us-gaap	Assets Assets	1944570000	USD
CY2019Q1	us-gaap	Assets Assets	1991345000	USD
CY2019Q2	us-gaap	Assets Assets	1998699000	USD
CY2019Q3	us-gaap	Assets Assets	2033227000	USD
CY2019Q4	us-gaap	Assets Assets	2068796000	USD
CY2018Q1	us-gaap	Deposits Deposits	1428192000	USD
CY2018Q2	us-gaap	Deposits Deposits	1416646000	USD
CY2018Q3	us-gaap	Deposits Deposits	1514911000	USD
CY2018Q4	us-gaap	Deposits Deposits	1527085000	USD
CY2019Q1	us-gaap	Deposits Deposits	1606875000	USD
CY2019Q2	us-gaap	Deposits Deposits	1592956000	USD
CY2019Q3	us-gaap	Deposits Deposits	1623290000	USD
CY2019Q4	us-gaap	Deposits Deposits	1650466000	USD
CY2018Q1	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	244229000	USD
CY2018Q2	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	297455000	USD
CY2018Q3	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	265274000	USD
CY2018Q4	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	210317000	USD
CY2019Q1	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	170419000	USD
CY2019Q2	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	181858000	USD
CY2019Q3	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	181417000	USD
CY2019Q4	fnlc	Total Federal Home Loan Bank Advances Treasury Tax Notes And Repurchase Agreements TotalFederalHomeLoanBankAdvancesTreasuryTaxNotesAndRepurchaseAgreements	184955000	USD
CY2018Q1	us-gaap	Other Liabilities OtherLiabilities	18022000	USD
CY2018Q2	us-gaap	Other Liabilities OtherLiabilities	16556000	USD
CY2018Q3	us-gaap	Other Liabilities OtherLiabilities	17008000	USD
CY2018Q4	us-gaap	Other Liabilities OtherLiabilities	15626000	USD
CY2019Q1	us-gaap	Other Liabilities OtherLiabilities	16264000	USD
CY2019Q2	us-gaap	Other Liabilities OtherLiabilities	19292000	USD
CY2019Q3	us-gaap	Other Liabilities OtherLiabilities	20031000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	20867000	USD
CY2018Q1	us-gaap	Stockholders Equity StockholdersEquity	181372000	USD
CY2018Q2	us-gaap	Stockholders Equity StockholdersEquity	183304000	USD
CY2018Q3	us-gaap	Stockholders Equity StockholdersEquity	184661000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	191542000	USD
CY2019Q1	us-gaap	Stockholders Equity StockholdersEquity	197787000	USD
CY2019Q2	us-gaap	Stockholders Equity StockholdersEquity	204593000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	208489000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	212508000	USD
CY2018Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1871815000	USD
CY2018Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1913961000	USD
CY2018Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1981854000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1944570000	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1991345000	USD
CY2019Q2	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1998699000	USD
CY2019Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2033227000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2068796000	USD
CY2018Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	16451000	USD
CY2018Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	17205000	USD
CY2018Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	18086000	USD
CY2018Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	18801000	USD
CY2019Q1	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	19268000	USD
CY2019Q2	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	19822000	USD
CY2019Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	19904000	USD
CY2019Q4	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	19657000	USD
CY2018Q1	us-gaap	Interest Expense InterestExpense	4042000	USD
CY2018Q2	us-gaap	Interest Expense InterestExpense	4936000	USD
CY2018Q3	us-gaap	Interest Expense InterestExpense	5550000	USD
CY2018Q4	us-gaap	Interest Expense InterestExpense	5806000	USD
CY2019Q1	us-gaap	Interest Expense InterestExpense	6369000	USD
CY2019Q2	us-gaap	Interest Expense InterestExpense	6872000	USD
CY2019Q3	us-gaap	Interest Expense InterestExpense	6678000	USD
CY2019Q4	us-gaap	Interest Expense InterestExpense	6239000	USD
CY2018Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12409000	USD
CY2018Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12269000	USD
CY2018Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12536000	USD
CY2018Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12995000	USD
CY2019Q1	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12899000	USD
CY2019Q2	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	12950000	USD
CY2018Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	11909000	USD
CY2019Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	250000	USD
CY2019Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	375000	USD
CY2019Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	13226000	USD
CY2019Q4	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	13418000	USD
CY2018Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	500000	USD
CY2018Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	500000	USD
CY2018Q3	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	333000	USD
CY2018Q4	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	167000	USD
CY2019Q1	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	375000	USD
CY2019Q2	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	250000	USD
CY2018Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	11769000	USD
CY2018Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12203000	USD
CY2018Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12828000	USD
CY2019Q1	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12524000	USD
CY2019Q2	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12700000	USD
CY2019Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	12976000	USD
CY2019Q4	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	13043000	USD
CY2018Q1	us-gaap	Noninterest Income NoninterestIncome	3132000	USD
CY2018Q2	us-gaap	Noninterest Income NoninterestIncome	3181000	USD
CY2018Q3	us-gaap	Noninterest Income NoninterestIncome	3034000	USD
CY2018Q4	us-gaap	Noninterest Income NoninterestIncome	3253000	USD
CY2019Q1	us-gaap	Noninterest Income NoninterestIncome	3144000	USD
CY2019Q2	us-gaap	Noninterest Income NoninterestIncome	3605000	USD
CY2019Q3	us-gaap	Noninterest Income NoninterestIncome	3532000	USD
CY2019Q4	us-gaap	Noninterest Income NoninterestIncome	3908000	USD
CY2018Q1	us-gaap	Noninterest Expense NoninterestExpense	8579000	USD
CY2018Q2	us-gaap	Noninterest Expense NoninterestExpense	8176000	USD
CY2018Q3	us-gaap	Noninterest Expense NoninterestExpense	8216000	USD
CY2018Q4	us-gaap	Noninterest Expense NoninterestExpense	8496000	USD
CY2019Q1	us-gaap	Noninterest Expense NoninterestExpense	8398000	USD
CY2019Q2	us-gaap	Noninterest Expense NoninterestExpense	8730000	USD
CY2019Q3	us-gaap	Noninterest Expense NoninterestExpense	9040000	USD
CY2019Q4	us-gaap	Noninterest Expense NoninterestExpense	9004000	USD
CY2018Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6462000	USD
CY2018Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6774000	USD
CY2018Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7021000	USD
CY2018Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7585000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7270000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7575000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7468000	USD
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	7947000	USD
CY2018Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	956000	USD
CY2018Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1040000	USD
CY2018Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1088000	USD
CY2018Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1222000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1114000	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1180000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1180000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1261000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	5506000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	5734000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	5933000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	6363000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	6156000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	6395000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	6288000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	6686000	USD
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.57
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.59
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.62
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.51
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.55
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.59
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.58
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.60
CY2018Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-3309000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1035000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1888000	USD
CY2018Q4	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	4082000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	3512000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	4289000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	936000	USD
CY2019Q4	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-29000	USD
CY2018Q2	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-7000	USD
CY2018Q1	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-8000	USD
CY2018Q3	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-5000	USD
CY2018Q4	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	-3000	USD
CY2019Q1	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	3000	USD
CY2019Q2	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	4000	USD
CY2019Q3	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	1000	USD
CY2019Q4	fnlc	Availableforsale Securities Transferredto Heldtomaturity Securities Unrealized Gain Loss AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss	7000	USD
CY2018Q1	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	384000	USD
CY2018Q2	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	138000	USD
CY2018Q3	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	216000	USD
CY2018Q4	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	-844000	USD
CY2019Q1	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	-465000	USD
CY2019Q2	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	-898000	USD
CY2019Q3	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	-340000	USD
CY2019Q4	us-gaap	Unrealized Gain Loss On Cash Flow Hedging Instruments UnrealizedGainLossOnCashFlowHedgingInstruments	362000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2018Q4	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	-184000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	0	USD
CY2019Q4	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetTransitionAssetObligationNetOfTax	13000	USD
CY2018Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-2933000	USD
CY2018Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-904000	USD
CY2018Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1677000	USD
CY2018Q4	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3419000	USD
CY2019Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3050000	USD
CY2019Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	3395000	USD
CY2019Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	597000	USD
CY2019Q4	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	327000	USD
CY2018Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2573000	USD
CY2018Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	4830000	USD
CY2018Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	4256000	USD
CY2018Q4	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9782000	USD
CY2019Q1	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9206000	USD
CY2019Q2	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9790000	USD
CY2019Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	6885000	USD
CY2019Q4	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	7013000	USD

Files In Submission

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$FNLC
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2019 Q4 Form 10-K Financial Statement

#000076520720000010 Filed on March 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNLC First Bancorp, Inc /ME/ Stock $fnlc

2019 Q4 Form 10-K Financial Statement

#000076520720000010 Filed on March 06, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNLC
First Bancorp, Inc /ME/ Stock $fnlc