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Equity-Based Compensation Plans (Narrative) (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Stock based compensation expense |  |  |  | $ 1,095,000 | $ 714,000 | $ 710,000 |
Stock based compensation, income tax benefit |  |  |  | 405,000 | 264,000 | 277,000 |
Proceeds from stock options exercised |  |  |  | $ 287,000 | 375,000 | 112,000 |
Restricted Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock based compensation expense |  |  | $ 733,000 |  |  |  |
First Bancorp Plans [Member] |  |  |  |  |  |  |
Vesting period |  |  |  | 10 years |  |  |
Exercise price range - floor |  |  |  | $ 14.35 |  |  |
Exercise prices range - ceiling |  |  |  | $ 16.81 |  |  |
Stock options outstanding |  |  |  | 38,689 |  |  | 38,689
First Bancorp Plans [Member] | 2014 Equity Plan [Member] |  |  |  |  |  |  |
Shares remaining available for grant |  |  |  | 809,690 |  |  | 809,690
Director [Member] |  |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 320,000 |  |  |
Employees Grants [Member] |  |  |  |  |  |  |
Stock based compensation expense |  |  |  | 775,000 |  |  |
Non-Employee Directors [Member] |  |  |  |  |  |  |
Stock based compensation expense | $ 320,000 | $ 129,000 |  |  |  |  |
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 |  |  |  |  |
Senior Executives [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Total compensation expense associated with senior executives grants |  |  |  | 758,000 |  |  | $ 758,000
Stock based compensation expense |  |  |  | $ 282,000 | 220,000 | 93,000 |
Vesting period |  |  |  | 3 years |  |  |
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 |  |  |  | $ 491,000 | $ 366,000 | $ 488,000 | $ 2,800,000
Vesting period |  |  |  |  |  |  | 3 years
Grants in period (options) |  |  |  |  |  |  | 130,059

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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