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Stock-Based Compensation Plans (Narrative) (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 01, 2019 USD ($) $ / shares shares	Jun. 01, 2018 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) director $ / shares shares	Jun. 30, 2018 USD ($)	Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 801	$ 596	$ 1,202	$ 827
Stock options outstanding (in shares) | shares			0		0		9,000
Proceeds from stock options exercised			$ 129	$ 216	$ 129	$ 324
Non-Employee Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 320	$ 352
Director equity grants granted, value					$ 32
Number of directors | director					11
Granted during the period (in shares) | shares	9,030	8,393
Granted during the period, per director (in shares) | shares	903	763
Granted during the period (in dollars per share) | $ / shares	$ 35.41	$ 41.93
Long-Term Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted during the period (in shares) | shares					82,411
Granted during the period (in dollars per share) | $ / shares					$ 36.37
Unrecognized compensation expense			4,154		$ 4,154
Unrecognized compensation expense, period for recognition					2 years 4 months 24 days
Long-Term Restricted Stock | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			2,006		$ 2,006
Long-Term Restricted Stock | Remaining Quarters of 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			$ 1,062		$ 1,062
First Bancorp 2014 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant (in shares) | shares			662,551		662,551
First Bancorp Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares) | shares			0		0

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