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Investment Securities Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | $ 13,912fnlc_RestrictedEquitySecuritiesAmortizedCost | $ 13,912fnlc_RestrictedEquitySecuritiesAmortizedCost | $ 13,912fnlc_RestrictedEquitySecuritiesAmortizedCost
Unrealized Gains | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains
Unrealized Losses | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses
Fair Value (Estimated) | 13,912fnlc_RestrictedEquitySecuritiesFairValueEstimated | 13,912fnlc_RestrictedEquitySecuritiesFairValueEstimated | 13,912fnlc_RestrictedEquitySecuritiesFairValueEstimated
Federal Home Loan Bank Stock |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 12,875fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 12,875fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 12,875fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember
Unrealized Gains | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember
Unrealized Losses | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember
Fair Value (Estimated) | 12,875fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 12,875fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember | 12,875fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalHomeLoanBankStockMember
Federal Reserve Bank Stock |  |  |
Restricted Equity Securities [Line Items] |  |  |
Amortized Cost | 1,037fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 1,037fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 1,037fnlc_RestrictedEquitySecuritiesAmortizedCost / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember
Unrealized Gains | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedGains / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember
Unrealized Losses | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | 0fnlc_RestrictedEquitySecuritiesUnrealizedLosses / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember
Fair Value (Estimated) | $ 1,037fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | $ 1,037fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember | $ 1,037fnlc_RestrictedEquitySecuritiesFairValueEstimated / fnlc_ScheduleOfRestrictedEquitySecuritiesAxis = fnlc_FederalReserveBankStockMember

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- Definition This item represents the cost of equity securities in Federal Home loan Banks and Federal Reserve Bank reported at cost and categorized as non-marketable with no determinable fair value because it ownership is restricted and it lacks a market. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of non marketable securities as of the balance sheet date. + References No definition available. + Details
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- Details
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- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References No definition available. + Details
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- Definition As of the balance sheet date, the excess of carrying value (amortized cost) over fair value of a security categorized as non marketable securities, exclusive of dividend or interest income recognized but not yet received and exclusive of any write-downs for other-than-temporary impairment. Such item represents the gross unrecognized holding loss. + References No definition available. + Details
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- Details
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- Details
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