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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2021 USD ($) $ / shares shares | Jun. 01, 2020 USD ($) director $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense |  |  | $ 536 | $ 605 | $ 1,764 | $ 2,013
Stock-based compensation tax benefit |  |  | 123 | $ 139 | $ 405 | $ 463
Long-Term Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted during the period | shares |  |  |  |  | 63,950 |
Fair market value of shares granted (in dollars per share) | $ / shares |  |  |  |  | $ 37.29 |
Unrecognized compensation expense |  |  | 2,986 |  | $ 2,986 |
Unrecognized compensation expense, period for recognition |  |  |  |  | 2 years 1 month 6 days |
Long-Term Restricted Stock | Next Twelve Months |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  |  | 1,550 |  | $ 1,550 |
Long-Term Restricted Stock | Fourth Quarter of 2021 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 504 |  | $ 504 |
Non-employee Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense | $ 320 | $ 352 |  |  |  |
Director equity grants granted, value |  | $ 32 |  |  |  |
Number of directors | director |  | 10 |  |  |  |
Number of shares granted during the period | shares | 7,050 | 14,146 |  |  |  |
Number of shares granted per director | shares | 705 | 1,286 |  |  |  |
Fair market value of shares granted (in dollars per share) | $ / shares | $ 45.41 | $ 24.87 |  |  |  |
First Bancorp 2014 Equity Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares remaining available for grant | shares |  |  | 485,695 |  | 485,695 |

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