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Equity-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		33 Months Ended	39 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017
Stock based compensation expense			$ 204	$ 146	$ 860	$ 527
Stock based compensation, income tax benefit					318	206
Proceeds from stock options exercised			$ 0	0	$ 287	375
First Bancorp 2014 Equity Plan [Member]
Shares remaining available for grant			803,946		803,946		803,946	803,946
First Bancorp Plans [Member]
Stock options outstanding			40,689		40,689		40,689	40,689
Exercise price range - floor					$ 14.35
Exercise prices range - ceiling					$ 16.81
Director [Member]
Stock based compensation expense					$ 320
Employees Grants [Member]
Stock based compensation expense					540
Senior Executives [Member] | Restricted Stock [Member]
Stock based compensation expense			$ 66	55	216	165
Stock-based compensation expense expected to be recorded			66		$ 66		$ 66	$ 66
Vesting period					3 years
Total compensation expense associated with senior executives grants			758		$ 758		758	$ 758
Grants in period (options)								55,648
Percent of bonus earned under the incentive plan in cash					50.00%
Percent of bonus earned under the incentive plan in shares of restricted stock					50.00%
Employees [Member]
Stock based compensation expense			138	$ 92	$ 324	$ 234	2,800
Stock-based compensation expense expected to be recorded			$ 167		$ 167		$ 167	$ 167
Vesting period							3 years
Grants in period (options)							130,059
Non-employee directors [Member]
Stock based compensation expense	$ 320	$ 129
Shares granted to directors	11,190	6,584
Shares granted per director	1,119	823
Shares granted to directors, Per share	$ 28.59	$ 19.56

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