Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Projected benefit obligation	$ 56,411	$ 60,479	$ 52,142
Fair value of plan assets	49,821	46,161	$ 42,866
Underfunded status	6,590	14,318
Net actuarial gain	(704)	(6,946)
Total accumulated other comprehensive income	(704)	(6,946)
Net actuarial gain (loss)	$ (704)	$ (6,946)

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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