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Stock-Based Compensation (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jun. 01, 2020 USD ($) director $ / shares shares | Jun. 01, 2019 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / shares shares | Sep. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense |  |  | $ 606,000 | $ 546,000 | $ 2,013,000 | $ 1,748,000
Stock-based compensation tax benefit |  |  | 139,000 | $ 125,000 | 463,000 | 402,000
Proceeds from stock options exercised |  |  |  |  | $ 0 | $ 129,000
Non-Employee Director Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock based compensation expense | $ 352,000 | $ 320,000 |  |  |  |
Director equity grants granted, value | $ 32,000 |  |  |  |  |
Number of directors | director | 11 |  |  |  |  |
Number of shares granted during the period | shares | 14,146 | 9,030 |  |  |  |
Number of shares granted per director | shares | 1,286 | 903 |  |  |  |
Granted during the period (in dollars per share) | $ / shares | $ 24.87 | $ 35.41 |  |  |  |
Long-Term Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted during the period | shares |  |  |  |  | 41,966 |
Granted during the period (in dollars per share) | $ / shares |  |  |  |  | $ 28.58 |
Unrecognized compensation expense |  |  | 2,428,000 |  | $ 2,428,000 |
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 |  |  | 1,574,000 |  | $ 1,574,000 |
Long-Term Restricted Stock | Remaining Quarters of 2020 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 473,000 |  | $ 473,000 |
First Bancorp 2014 Equity Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares remaining available for grant | shares |  |  | 576,614 |  | 576,614 |
First Bancorp Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  | 0 |  | 0 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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