Benefit Plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
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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Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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