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Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Shares held in employee trust (in shares) | 130,863 | 130,863 |
Initial vesting percentage | 25.00% |  |
Vesting percentage | 100.00% |  |
Vesting period (in years) | 4 years |  |
Cost recognized | $ 426 | $ 393 | $ 403
Allocated share-based compensation expense | $ 6,554 | $ 6,185 | $ 5,831
Non-Management Award Grant |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Shares issued for services (in shares) | 50,245 | 47,130 | 67,226
Shares issued for services, value | $ 587 | $ 500 | $ 595
Non-vested Shares |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Non-options, nonvested, number (in shares) | 2,290,644 | 2,704,729 | 2,941,412
Number of shares available for grant (in shares) | 1,410,110 |  |
Compensation cost not yet recognized | $ 6,502 |  |
Total compensation cost not yet recognized, period for recognition (in years) | 1 year 8 months 12 days |  |
Shares Subject to Time |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Non-options, nonvested, number (in shares) | 677,275 |  |
Shares Subject to Performance |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] |  |  |
Non-options, nonvested, number (in shares) | 1,613,369 |  |

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