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Loans - Narrative (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 loan | Mar. 31, 2014 loan | Dec. 31, 2014 loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 90us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 101us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 94us-gaap_FinancingReceivableModificationsNumberOfContracts2
Financing Receivable, Modifications, Recorded Investment | $ 26,524us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 28,796us-gaap_FinancingReceivableModificationsRecordedInvestment | $ 27,214us-gaap_FinancingReceivableModificationsRecordedInvestment
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In T D R In Previous 12 Months | 8fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months | 13fnlc_FinancingReceivableModificationsNumberOfContractsGreaterThan30DaysPastDuePlaceInTDRInPrevious12Months |
Financing Receivable Recorded Investment Greater Than30 Days Past Due | 1,121fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue | 1,915fnlc_FinancingReceivableRecordedInvestmentGreaterThan30DaysPastDue |
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Had Been Placed On TDR Status In Previous 12 Months |  | 2fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatHadBeenPlacedOnTdrStatusInPrevious12Months |
Loans classified as TDR in last 12 months |  | 301fnlc_FinancingReceivableLoansClassifiedasTroubledDebtRestructuringsThatHadBeenPlacedonTDRStatusinPrevious12Months |
Financing Receivable Modifications Number Of Contracts During Period | 0fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod | 3fnlc_FinancingReceivableModificationsNumberOfContractsDuringPeriod |
Financing Receivable Modifications Post Modification Recorded Investment During Period |  | 293fnlc_FinancingReceivableModificationsPostModificationRecordedInvestmentDuringPeriod |
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy | 9fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy |  |
Financing Receivable, Loans Classified As Troubled Debt Restructurings That Are Involved In Bankruptcy | 1,206fnlc_FinancingReceivableLoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInBankruptcy |  |
Financing Receivable Number Of Loans Classified As Troubled Debt Restructurings That Were On Non Accrual Status | 14fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsThatWereOnNonAccrualStatus |  |
Financing Receivable, Number of Loans Classified As Troubled Debt Restructurings Classified As NonAccrual | 2,019fnlc_FinancingReceivableNumberofLoansClassifiedAsTroubledDebtRestructuringsClassifiedAsNonAccrual |  |
Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure | 4fnlc_FinancingReceivableNumberOfLoansClassifiedAsTroubledDebtRestructuringsInvolvedInForeclosure |  |
Loans Classified As Troubled Debt Restructurings That Are Involved In Foreclosure | 472fnlc_LoansClassifiedAsTroubledDebtRestructuringsThatAreInvolvedInForeclosure |  |
Mortgage Loans in Process of Foreclosure, Number | 16fnlc_MortgageLoansinProcessofForeclosureNumber |  |
Mortgage Loans in Process of Foreclosure, Amount | $ 1,677us-gaap_MortgageLoansInProcessOfForeclosureAmount |  |
Unallocated |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number Of Days Past Due | 30 days | 30 days |

X
- Definition Carrying amount of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date. + References No definition available. + Details
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- Definition Carrying amount of loans classified as troubled debt restructurings that had been placed on TDR status in previous 12 months. + References No definition available. + Details
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- Definition The number of financing receivables that have been modified by troubled debt restructurings during the current period. + References No definition available. + Details
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- Definition The number of financing receivables greater than 30 days past due that have been modified by troubled debt restructurings and that have been placed in the TDR status in the previous 12 months. + References No definition available. + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings after the financing receivable has been modified during the current period. + References No definition available. + Details
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- Definition Financing Receivable, Number of Loans Classified As Troubled Debt Restructurings Classified As NonAccrual + References No definition available. + Details
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- Definition Financing Receivable, Number Of Loans Classified As Troubled Debt Restructurings Involved In Foreclosure + References No definition available. + Details
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- Definition The number of loans classified as troubled debt restructurings that are involved in bankruptcy as of the balance sheet date. + References No definition available. + Details
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- Definition The number of loans classified as troubled debt restructurings that had been placed on TDR status in the previous 12 months. + References No definition available. + Details
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- Definition The number of loans classified as troubled debt restructurings that were on non-accrual status as of the balance sheet date. + References No definition available. + Details
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- Definition Financing receivables that are greater than 30 days past due. + References No definition available. + Details
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- Definition Loans classified as troubled debt restructurings that are involved in foreclosure as of the balance sheet date. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL49126937-111524 + Details
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