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Stock Compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock options granted | $ 0 |  | $ 0 |  |  |
Shares, granted (in shares) | 0 | 0 |  |  |  |
Compensation expense restricted stock awards | $ 312,000 | $ 288,000 | 1,124,000 | $ 1,123,000 |  |
Fair value of shares vesting during period | 9,000 | 3,000 | $ 814,000 | 1,109,000 |  |
Vesting in year one |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 33.00% |  |  |
Vesting in year two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 25.00% |  |  |
Vesting in year three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock incentive plan, vesting per year |  |  | 20.00% |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Income tax benefit from share-based compensation | $ 65,000 | $ 60,000 | $ 236,000 | $ 235,000 |  |
Granted (in shares) | 2,203 |  | 37,423 |  |  |
Weighted average grant (in dollars per share) | $ 24.30 |  | $ 21.28 |  |  |
Unrecognized compensation cost related to nonvested restricted stock | $ 1,258,000 |  | $ 1,258,000 |  |  | $ 1,055,000
Shares vested (in shares) | 361 |  | 23,508 |  |  |
Performance Based Restricted Stock Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Fair value of shares vesting during period |  |  | $ 223,000 |  |  |
Shares vested (in shares) |  |  | 10,587 |  |  |
Performance Based Restricted Stock Awards | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares, granted (in shares) |  |  | 18,210 | 18,100 | 16,681 |
Award vesting period |  |  | 3 years |  |  |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted (in shares) |  |  | 14,886 |  |  |
Weighted average grant (in dollars per share) |  |  | $ 21.03 |  |  |
Key Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Starting period of vesting of stock based award |  |  | 1 year |  |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |  |
Independent Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Starting period of vesting of stock based award |  |  | 1 year |  |  |
Aggregate percentage of stock based awards to be matured |  |  | 100.00% |  |  |

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