Retirement Benefits - Funded Status And Components Of Post Retirement Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefits paid	$ (99)	$ (97)	$ (103)
Other Pension Plans, Defined Benefit
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated postretirement benefit obligation beginning of year	1,133	1,241	1,359
Service cost	0	0	9
Interest cost	22	33	52
Actuarial gain	(77)	(44)	(76)
Benefits paid	(99)	(97)	(103)
Accumulated postretirement benefit obligation end of year	979	1,133	1,241
Accrued liability (included in accrued expenses and other liabilities)	$ 979	$ 1,133	$ 1,241