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Employee Benefit Plans, Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Unamortized net actuarial gain (loss)	$ (192)	$ 289	$ (192)
Deferred tax (expense) benefit at 35%	67	(101)	67
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss)	$ (125)	$ 188	$ (125)	$ 188
Deferred Tax Benefit, Percentage	35.00%fnlc_DeferredTaxBenefitPercentage	35.00%fnlc_DeferredTaxBenefitPercentage	35.00%fnlc_DeferredTaxBenefitPercentage

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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