Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Loss due to curtailment			$ 0	$ 163
Defined Benefit Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 483	0	1,311
Interest cost	642	672	1,927	2,359
Expected return on assets	(1,355)	(1,344)	(4,065)	(4,332)
Net loss amortization	251	694	752	1,780
Prior service (credit) cost amortization	0	(4)	0	(11)
Loss due to curtailment			0	151
Net periodic benefit (income) cost	(462)	501	(1,386)	1,258
Defined Benefit Pension Plan Acquired
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	23	41	69	122
Expected return on assets	(53)	(75)	(158)	(226)
Net loss amortization	1	2	4	7
Prior service (credit) cost amortization	0	0	0	0
Loss due to curtailment			0	0
Net periodic benefit (income) cost	(29)	(32)	(85)	(97)
Restoration Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	149	0	280
Interest cost	130	126	390	442
Expected return on assets	0	0	0	0
Net loss amortization	64	125	192	426
Prior service (credit) cost amortization	0	2	0	5
Loss due to curtailment			0	12
Net periodic benefit (income) cost	$ 194	$ 402	$ 582	$ 1,165