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Acquisitions - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2023 USD ($) branch option $ / shares shares | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 478,750 | $ 478,750 | $ 364,263
Fair value mark | $ 29,500 |  |  |
Merger and acquisition expenses |  | 0 | 13,695 | 5,072
Provision for loan losses |  | 18,751 | 19,750 | 12,600
Unfunded Loan Commitment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Provision for loan losses |  | $ (2,303) | (3,858) |
Grand South |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interest acquired | 100.00% |  |  |
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 purchase price | $ 229,489 |  |  |
Price per share at acquisition date (in US dollars per share) | $ / shares | $ 42.84 |  |  |
Number banking locations | branch | 8 |  |  |
Goodwill | $ 114,487 |  |  |
Loans reclassified from fair value mark to ACL resulting from PCD loans | 5,610 |  |  |
Merger and acquisition expenses |  |  | $ 13,700 |
Allowance for credit loss, excluding accrued interest |  |  |  | $ 2,200
Allowance for credit loss, increase from acquisition, non-purchase | 12,200 |  |  |
Grand South | Unfunded Loan Commitment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Provision for loan losses | $ 1,900 |  |  |
Grand South | Core deposit intangibles |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Identifiable intangible assets, useful life | 10 years |  |  |
Useful life | 41 months |  |  |

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