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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 01, 2020 USD ($) $ / shares shares | Jun. 01, 2019 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) director $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense |  |  | $ 2,540 | $ 2,270 | $ 1,569 |
Income tax benefits related to stock-based compensation expense |  |  | $ 584 | $ 522 | $ 367 |
Stock options outstanding (in shares) | shares |  |  | 0 | 0 | 9,000 | 38,689
Proceeds from stock options exercised |  |  | $ 0 | $ 129 | $ 324 |
Non-Employee Director Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 352 | $ 320 |  |  |  |
Director equity grants granted, value |  |  | $ 32 |  |  |
Number of directors | director |  |  | 11 |  |  |
Granted during the period (in shares) | shares | 14,146 | 9,030 |  |  |  |
Granted during the period, per director (in shares) | shares | 1,286 | 903 |  |  |  |
Granted during the period (in dollars per share) | $ / shares | $ 24.87 | $ 35.41 |  |  |  |
Long-Term Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted during the period (in shares) | shares |  |  | 68,704 | 82,826 | 66,060 |
Granted during the period (in dollars per share) | $ / shares |  |  | $ 26.96 | $ 36.36 | $ 40.04 |
Unrecognized compensation expense |  |  | $ 2,554 |  |  |
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 |  |  | $ 1,577 |  |  |
First Bancorp 2014 Equity Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares remaining available for grant (in shares) | shares |  |  | 549,876 |  |  |
First Bancorp Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  | 0 | 0 |  |

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