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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		39 Months Ended	45 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2018
Stock based compensation expense	$ 231	$ 178
Stock based compensation, income tax benefit	54	66
Proceeds from stock options exercised	108	45
Employees [Member]
Stock based compensation expense	155	109	$ 2,000
Stock-based compensation expense expected to be recorded	154		$ 154	$ 154
Vesting period			3 years
Grants in period (options)			88,494
Non-employee directors [Member]
Equity grants value	32
Restricted Stock [Member] | Senior Executives [Member]
Stock based compensation expense	74	$ 69
Stock-based compensation expense expected to be recorded	$ 74		$ 74	74
Vesting period	3 years
Total compensation expense associated with senior executives grants	$ 907		$ 907	$ 907
Grants in period (options)				54,861
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%
First Bancorp 2014 Equity Plan [Member]
Shares remaining available for grant	796,182		796,182	796,182
First Bancorp Plans [Member]
Stock options outstanding	29,181		29,181	29,181
Exercise price range - floor	$ 14.35
Exercise prices range - ceiling	$ 16.81

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