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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2021 USD ($) $ / shares shares | Jun. 01, 2020 USD ($) director $ / shares shares | Jun. 30, 2021 USD ($) shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares shares | Jun. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense |  |  | $ 831 | $ 895 | $ 1,228 | $ 1,408
Stock-based compensation tax benefit |  |  | 191 | $ 206 | $ 282 | $ 324
Long-Term Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted during the period | shares |  |  |  |  | 26,350 |
Fair market value of shares granted (in dollars per share) | $ / shares |  |  |  |  | $ 35.19 |
Unrecognized compensation expense |  |  | 2,065 |  | $ 2,065 |
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 |  |  | 1,255 |  | $ 1,255 |
Long-Term Restricted Stock | Remaining Quarters of 2020 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 797 |  | $ 797 |
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 |  |  | 523,295 |  | 523,295 |

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