Employee Benefit Plans - reconciliation of accumulated liability projected benefit obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance at beginning of year	$ 27,402	$ 24,914
Defined Benefit Plan, Benefit Obligation, established through acquisition	4,889	0
Change in actuarial loss	(732)	2,836
Benefit expense	1,735	1,887
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,200	2,235
Balance at end of year	$ 32,094	$ 27,402