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Stock-Based Compensation - Narrative (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Jun. 01, 2023 USD ($) $ / shares shares | Jun. 01, 2022 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) director $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 4,600,000 | $ 3,000,000 | $ 2,300,000
Income tax benefits related to stock-based compensation expense |  |  | 1,100,000 | 700,000 | 500,000
Fair value, vested in period |  |  | $ 2,200,000 | 2,600,000 | $ 2,500,000
Non-Employee Director Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of directors | director |  |  | 14 |  |
Director equity grants granted, value |  |  | $ 37,500 | $ 32,000 |
Granted during the period (in shares) | shares | 17,094 | 10,344 |  |  |
Granted during the period, per director (in shares) | shares | 1,221 | 862 |  |  |
Granted during the period (in usd per share) | $ / shares | $ 30.69 | $ 37.12 |  |  |
Director equity grants. expense | $ 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 |  |  | 143,380 | 95,960 | 104,414
Granted during the period (in usd per share) | $ / shares |  |  | $ 37.08 | $ 38.09 | $ 40.56
Unrecognized compensation expense |  |  | $ 5,000,000 |  |
Unrecognized compensation expense, period for recognition |  |  | 1 year 9 months 18 days |  |
Long-Term Restricted Stock | Next Twelve Months |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  |  | $ 3,300,000 |  |
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 |  |  | 205,498 |  |

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