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Stock-Based Compensation Plans (Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2019 USD ($) $ / shares shares | Jun. 01, 2018 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) director $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock based compensation expense |  |  | $ 546,000 | $ 374,000 | $ 1,748,000 | $ 1,201,000 |
Stock options outstanding (in shares) | shares |  |  | 0 |  | 0 |  | 9,000
Proceeds from stock options exercised |  |  | $ 0 | $ 0 | $ 129,000 | $ 324,000 |
Non-Employee Director Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock based compensation expense | $ 320,000 | $ 352,000 |  |  |  |  |
Director equity grants granted, value |  |  |  |  | $ 32,000 |  |
Number of directors | director |  |  |  |  | 11 |  |
Granted during the period (in shares) | shares | 9,030 | 8,393 |  |  |  |  |
Granted during the period, per director (in shares) | shares | 903 | 763 |  |  |  |  |
Granted during the period (in dollars per share) | $ / shares | $ 35.41 | $ 41.93 |  |  |  |  |
Long-Term Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Granted during the period (in shares) | shares |  |  |  |  | 82,826 |  |
Granted during the period (in dollars per share) | $ / shares |  |  |  |  | $ 36.36 |  |
Unrecognized compensation expense |  |  | 3,608,000 |  | $ 3,608,000 |  |
Unrecognized compensation expense, period for recognition |  |  |  |  | 2 years 2 months 12 days |  |
Long-Term Restricted Stock | Next Twelve Months |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | 1,872,000 |  | $ 1,872,000 |  |
Long-Term Restricted Stock | Remaining Quarters of 2019 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | $ 516,000 |  | $ 516,000 |  |
First Bancorp 2014 Equity Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares remaining available for grant (in shares) | shares |  |  | 675,319 |  | 675,319 |  |
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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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