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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
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Jun. 01, 2021 USD ($) $ / shares shares | Jun. 01, 2020 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) director $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense |  |  | $ 2,300 | $ 2,500 | $ 2,300
Income tax benefits related to stock-based compensation expense |  |  | 500 | 600 | 500
Proceeds from stock options exercised |  |  | 0 | $ 0 | $ 129
Stock option exercises (in shares) | shares |  |  |  |  | 9,000
Weighted average exercise price (in usd per share) | $ / shares |  |  |  |  | $ 14.35
Non-Employee Director Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 300 | $ 400 |  |  |
Director equity grants granted, value |  |  | $ 32 |  |
Number of directors | director |  |  | 13 |  |
Granted during the period (in shares) | shares | 7,050 | 14,146 |  |  |
Granted during the period, per director (in shares) | shares | 705 | 1,286 |  |  |
Granted during the period (in usd per share) | $ / shares | $ 45.41 | $ 24.87 |  |  |
Long-Term Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted during the period (in shares) | shares |  |  | 104,414 | 68,704 | 82,826
Granted during the period (in usd per share) | $ / shares |  |  | $ 40.56 | $ 26.96 | $ 36.36
Unrecognized compensation expense |  |  | $ 4,300 |  |
Unrecognized compensation expense, period for recognition |  |  | 2 years 4 months 24 days |  |
Long-Term Restricted Stock | Next Twelve Months |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation expense |  |  | $ 2,000 |  |
First Bancorp 2014 Equity Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares remaining available for grant (in shares) | shares |  |  | 445,231 |  |
First Bancorp Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options outstanding (in shares) | shares |  |  | 0 | 0 | 0

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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=120381028&loc=d3e5070-113901 + Details
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