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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost not yet recognized | $ 6,072 |  | $ 6,072 |  |  |
Stock-based compensation expense | $ 2,069 | $ 1,598 | $ 6,876 | $ 3,546 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 3 years |  |  |
Weighted average price per share (in dollars per share) | $ 30.06 |  | $ 30.06 |  | $ 31.40 | $ 28.90
Restricted Stock Units (RSUs) | Director |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  | 1 year |  |  |
Restricted Stock Units (RSUs) | 2015 Incentive Award Plan | 2015 Incentive Award Plan approved on June 19, 2015 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (shares) | 3,000,000 |  | 3,000,000 |  |  |
Number of shares available for grant (shares) | 1,485,238 |  | 1,485,238 |  |  |

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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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