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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 01, 2021 USD ($) $ / shares shares	Jun. 01, 2020 USD ($) director $ / shares shares	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 831	$ 895	$ 1,228	$ 1,408
Stock-based compensation tax benefit			191	$ 206	$ 282	$ 324
Long-Term Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period | shares					26,350
Fair market value of shares granted (in dollars per share) | $ / shares					$ 35.19
Unrecognized compensation expense			2,065		$ 2,065
Unrecognized compensation expense, period for recognition					1 year 9 months 18 days
Long-Term Restricted Stock | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			1,255		$ 1,255
Long-Term Restricted Stock | Remaining Quarters of 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			$ 797		$ 797
Non-employee Directors
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		10
Number of shares granted during the period | shares	7,050	14,146
Number of shares granted per director | shares	705	1,286
Fair market value of shares granted (in dollars per share) | $ / shares	$ 45.41	$ 24.87
First Bancorp 2014 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant | shares			523,295		523,295

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