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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 01, 2021 USD ($) $ / shares shares	Jun. 01, 2020 USD ($) director $ / shares shares	Sep. 30, 2021 USD ($) shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 536	$ 605	$ 1,764	$ 2,013
Stock-based compensation tax benefit			123	$ 139	$ 405	$ 463
Long-Term Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted during the period | shares					63,950
Fair market value of shares granted (in dollars per share) | $ / shares					$ 37.29
Unrecognized compensation expense			2,986		$ 2,986
Unrecognized compensation expense, period for recognition					2 years 1 month 6 days
Long-Term Restricted Stock | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			1,550		$ 1,550
Long-Term Restricted Stock | Fourth Quarter of 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			$ 504		$ 504
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			485,695		485,695

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