Employee Benefits - Benefit Obligation and Plan Assets Deriving Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Change in Projected Benefit Obligation
Projected benefit obligation at beginning of year	$ 117,506	$ 113,679
Interest cost	2,950	3,456	$ 3,987
Actuarial gain/(loss)	(2,136)	10,525
Benefits paid	(14,223)	(10,154)
Projected Benefit Obligation at End of Year	104,097	117,506	113,679
Change in Plan Assets
Fair value of plan assets at beginning of year	122,344	116,652
Actual return on plan assets	(596)	15,731
Employer contributions	0	115
Benefits paid	(14,223)	(10,154)
Fair Value of Plan Assets at End of Year	107,525	122,344	$ 116,652
Funded Status	$ 3,428	$ 4,838