Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss)	$ (1,771)	$ (3,721)
Prior service cost	0	0
Amount recognized in AOCI before tax effect	(1,771)	(3,721)
Tax benefit (expense)	407	855
Net amount recognized as decrease to AOCI	(1,364)	(2,866)	$ (3,091)
SERP
Defined Benefit Plan Disclosure [Line Items]
Net gain (loss)	(46)	629
Prior service cost	0	0
Amount recognized in AOCI before tax effect	(46)	629
Tax benefit (expense)	11	(145)
Net amount recognized as decrease to AOCI	$ (35)	$ 484	$ 624