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Stock-Based Compensation (Narrative) (Details)		3 Months Ended		9 Months Ended
	Jan. 01, 2023 shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) director $ / shares shares	Sep. 30, 2022 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 1,200,000	$ 700,000	$ 3,400,000	$ 1,900,000
Stock-based compensation tax benefit		278,000	$ 170,000	$ 798,000	$ 445,000
Number of directors | director				14
GrandSouth
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock portion, number of First Bancorp's stock for each share of acquiree common stock converted (in shares) | shares	0.91
Non-Employee Director Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Director equity grants granted, value				$ 37,500
Long-Term Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		6,100,000		$ 6,100,000
Unrecognized compensation expense, period for recognition				2 years
Long-Term Restricted Stock Awards | Next Twelve Months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		3,600,000		$ 3,600,000
Long-Term Restricted Stock Awards | Remaining Quarters of 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense		$ 1,200,000		$ 1,200,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average replacement price (in dollars per share) | $ / shares		$ 24.85		$ 24.85
Compensation costs not yet recognized, options		$ 0		$ 0
Expiration period				10 years
First Bancorp 2014 Equity Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for grant | shares		205,498		205,498

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