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Equity-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 33 Months Ended | 39 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2017
Stock based compensation expense |  |  | $ 204 | $ 146 | $ 860 | $ 527 |  |
Stock based compensation, income tax benefit |  |  |  |  | 318 | 206 |  |
Proceeds from stock options exercised |  |  | $ 0 | 0 | $ 287 | 375 |  |
First Bancorp 2014 Equity Plan [Member] |  |  |  |  |  |  |  |
Shares remaining available for grant |  |  | 803,946 |  | 803,946 |  | 803,946 | 803,946
First Bancorp Plans [Member] |  |  |  |  |  |  |  |
Stock options outstanding |  |  | 40,689 |  | 40,689 |  | 40,689 | 40,689
Exercise price range - floor |  |  |  |  | $ 14.35 |  |  |
Exercise prices range - ceiling |  |  |  |  | $ 16.81 |  |  |
Director [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | $ 320 |  |  |
Employees Grants [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | 540 |  |  |
Senior Executives [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  | $ 66 | 55 | 216 | 165 |  |
Stock-based compensation expense expected to be recorded |  |  | 66 |  | $ 66 |  | $ 66 | $ 66
Vesting period |  |  |  |  | 3 years |  |  |
Total compensation expense associated with senior executives grants |  |  | 758 |  | $ 758 |  | 758 | $ 758
Grants in period (options) |  |  |  |  |  |  |  | 55,648
Percent of bonus earned under the incentive plan in cash |  |  |  |  | 50.00% |  |  |
Percent of bonus earned under the incentive plan in shares of restricted stock |  |  |  |  | 50.00% |  |  |
Employees [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  | 138 | $ 92 | $ 324 | $ 234 | 2,800 |
Stock-based compensation expense expected to be recorded |  |  | $ 167 |  | $ 167 |  | $ 167 | $ 167
Vesting period |  |  |  |  |  |  | 3 years |
Grants in period (options) |  |  |  |  |  |  | 130,059 |
Non-employee directors [Member] |  |  |  |  |  |  |  |
Stock based compensation expense | $ 320 | $ 129 |  |  |  |  |  |
Shares granted to directors | 11,190 | 6,584 |  |  |  |  |  |
Shares granted per director | 1,119 | 823 |  |  |  |  |  |
Shares granted to directors, Per share | $ 28.59 | $ 19.56 |  |  |  |  |  |

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