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Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended			12 Months Ended
	Jan. 01, 2023 USD ($) option branchOffice $ / shares shares	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Price per share, at acquisition date | $ / shares	$ 42.84
Goodwill		$ 478,750			$ 478,750			$ 364,263	$ 364,263
Merger and acquisition expenses		0	$ 548		13,506	$ 4,769
Provision for loan losses		$ 1,200	5,100		16,351	8,600		$ 12,600
Unfunded Loan Commitment
Business Acquisition [Line Items]
Provision for loan losses				$ (200)	$ (3,408)		$ (1,200)
Core deposit intangibles
Business Acquisition [Line Items]
Useful life		10 years			10 years
GrandSouth
Business Acquisition [Line Items]
Common stock portion, number of First Bancorp's stock for each share of acquiree common stock converted (in shares) | shares	0.91
Number of shares issued | shares	5,032,834
Common stock options converted | option	542,345
Business acquisition, equity interest issued or issuable, common stock options, converted, exercise price (in dollars per share) | $ / shares	$ 20.14
Total consideration	$ 229,489
Number of locations | branchOffice	8
Goodwill	$ 114,487
Fair value mark	29,500
Allowance for loan losses	5,610
Merger and acquisition expenses		$ 0			$ 13,500
Allowance for loan losses			$ 1,100			$ 1,500
Allowance for credit loss, increase from acquisition, non-PCD	12,200
GrandSouth | Unfunded Loan Commitment
Business Acquisition [Line Items]
Provision for loan losses	$ 1,900			$ 0	$ 1,921		$ 0
GrandSouth | Core deposit intangibles
Business Acquisition [Line Items]
Useful life	10 years
Weighted average useful life	41 months

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