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Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 42 Months Ended | 48 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2018
Stock based compensation expense |  |  | $ 374 | $ 204 | $ 1,201 | $ 860 |  |
Stock based compensation, income tax benefit |  |  |  |  | 281 | 318 |  |
Proceeds from stock options exercised |  |  | 0 | 0 | 324 | 287 |  |
Employees [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  | 301 | 138 | 629 | 324 | $ 3,900 |
Stock-based compensation expense expected to be recorded |  |  | 305 |  | 305 |  |  |
Vesting period |  |  |  |  |  |  | 3 years |
Grants in period (options) |  |  |  |  |  |  | 135,189 |
Non-employee directors [Member] |  |  |  |  |  |  |  |
Stock based compensation expense | $ 352 | $ 320 |  |  |  |  |  |
Stock-based compensation expense expected to be recorded | 352 |  |  |  |  |  | $ 352 | $ 352
Equity grants value | $ 32 |  |  |  |  |  |  |
Grants in period (options) | 8,393 | 11,190 |  |  |  |  |  |
Exercise price | $ 41.93 | $ 28.59 |  |  |  |  | $ 41.93 | $ 41.93
Director [Member] |  |  |  |  |  |  |  |
Grants in period (options) | 763 | 1,119 |  |  |  |  |  |
Employee grants [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  | 849 |  |  |
Restricted Stock [Member] | Senior Executives [Member] |  |  |  |  |  |  |  |
Stock based compensation expense |  |  | 73 | $ 66 | 220 | $ 216 |  |
Stock-based compensation expense expected to be recorded |  |  | 73 |  | $ 73 |  |  |
Vesting period |  |  |  |  | 3 years |  |  |
Total compensation expense associated with senior executives grants |  |  | $ 1,400 |  | $ 1,400 |  |  |
Grants in period (options) |  |  |  |  |  |  |  | 54,529
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% |  |  |
First Bancorp 2014 Equity Plan [Member] |  |  |  |  |  |  |  |
Shares remaining available for grant |  |  | 745,104 |  | 745,104 |  |  |
First Bancorp Plans [Member] |  |  |  |  |  |  |  |
Stock options outstanding |  |  | 9,000 |  | 9,000 |  |  |
Exercise price |  |  | $ 14.35 |  | $ 14.35 |  |  |

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