Employee Benefit Plans - Schedule of Net Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	$ 0	$ 0	$ 0
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	0	0	0
Interest cost on projected benefit obligation	1,223	1,482	1,312
Expected return on plan assets	(1,300)	(1,562)	(1,115)
Net amortization and deferral	843	977	34
Net periodic pension cost	766	897	231
SERP
Defined Benefit Plan Disclosure [Line Items]
Service cost – benefits earned during the period	0	0	124
Interest cost on projected benefit obligation	158	219	200
Net amortization and deferral	(157)	(163)	(13)
Net periodic pension cost	$ 1	$ 56	$ 311