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Stock-Based Compensation - Narrative (Details) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 31, 2024 USD ($) $ / shares shares | Jun. 01, 2023 USD ($) $ / shares shares | Jan. 01, 2023 shares | Jun. 01, 2022 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) director $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 4,300,000 | $ 4,600,000 | $ 3,000,000.0
Income tax benefits related to stock-based compensation expense |  |  |  |  | 1,000,000.0 | 1,100,000 | 700,000
Fair value, vested in period |  |  |  |  | $ 5,000,000.0 | 2,200,000 | 2,600,000
Grand South |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
Number of directors | director |  |  |  |  | 13 |  |
Director equity grants granted, value |  |  |  |  | $ 37,500 | $ 37,500 | $ 32,000
Granted during the period (in shares) | shares | 15,457 | 17,094 |  | 10,344 |  |  |
Granted during the period, per director (in shares) | shares | 1,189 | 1,221 |  | 862 |  |  |
Granted during the period (in usd per share) | $ / shares | $ 31.55 | $ 30.69 |  | $ 37.12 |  |  |
Director equity grants. expense | $ 487,500 | $ 525,000 |  | $ 384,000 |  |  |
Long-Term Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted during the period (in shares) | shares |  |  |  |  | 67,900 | 143,380 | 95,960
Granted during the period (in usd per share) | $ / shares |  |  |  |  | $ 38.14 | $ 37.08 | $ 38.09
Unrecognized compensation expense |  |  |  |  | $ 3,000,000.0 |  |
Unrecognized compensation expense, period for recognition |  |  |  |  | 1 year 10 months 24 days |  |
Long-Term Restricted Stock | Next Twelve Months |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense |  |  |  |  | $ 2,100,000 |  |
Employee Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense |  |  |  |  | $ 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 (in shares) | shares |  |  |  |  | 1,930,548 |  |

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