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Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2023 USD ($) option branchOffice $ / shares shares | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Price per share, at acquisition date | $ / shares | $ 42.84 |  |  |  |  |
Goodwill |  | $ 478,750 |  | $ 478,750 |  | $ 478,750
Financing receivable, excluding accrued interest, credit loss expense (reversal) |  | $ 1,450 | $ 3,700 | 3,250 | $ 15,151 |
Unfunded Loan Commitment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Financing receivable, excluding accrued interest, credit loss expense (reversal) |  |  |  | $ (1,509) | (2,209) |
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 |  |  |  |  |
Less: Total consideration | $ 229,489 |  |  |  |  |
Number of locations | branchOffice | 8 |  |  |  |  |
Goodwill | $ 114,487 |  |  |  |  |
Fair value mark | 29,500 |  |  |  |  |
Initial allowance recorded for PCD loans | $ 5,610 |  |  |  |  |
GrandSouth | Unfunded Loan Commitment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Financing receivable, excluding accrued interest, credit loss expense (reversal) |  |  |  | $ 0 | $ 1,921 |
GrandSouth | Core deposit intangibles |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful life | 10 years |  |  |  |  |
Weighted average useful life | 41 months |  |  |  |  |

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