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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
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

X

- 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

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- Definition

This item represents the aggregate fair value of non marketable securities as of the balance sheet date.

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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

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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.

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