Benefit Plans - Components of Company Plan Benefit Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Accumulated Benefit Obligation, End of Year	$ 25,229	$ 30,139
Change in Projected Benefit Obligation
Projected Benefit Obligation, Beginning of Year	37,551	32,474
Service Cost	1,254	998
Interest Cost	1,306	1,393
Other reclassification [1]	(8,925)
Actuarial (Gain) Loss	3,180	3,449
Benefits Paid	(836)	(763)
Projected Benefit Obligation, End of Year	33,530	37,551
Change in Plan Assets
Company Contributions	836	763
Unfunded Status of the Plan	(33,530)	(37,551)
Amounts Recognized in Accumulated Other Comprehensive Income
Net Loss	10,925	8,285
Total Pension Cost	$ 10,925	$ 8,285