Employee Benefit Plans - Supplemental Life Insurance (Details) - Supplemental Life Insurance Benefit - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Post Retirement Benefit Plan Disclosures [Line Items]
Benefit obligation at beginning of year		$ 2,424	$ 2,084	$ 2,032
Net periodic benefit cost:
Service cost		(21)	(16)	(13)
Interest cost		131	95	94
Actuarial loss (gain)		97	261	(29)
Total net period cost		207	340	52
Benefit obligation at end of year		2,631	2,424	2,084
Accrued liability as of December 31		$ (2,631)	$ (2,424)	$ (2,084)
Discount rate used for benefit obligation	[1]	3.25%	4.00%	4.75%
Accrual for benefit obligation for following year		$ 63

[1] Management utilizes the Moody's 20 year AA corporate bond rates to establish the reasonableness of the discount rate used. The Company reviews and periodically updates the discount rate to reflect changes in bond market rates. The impact of the discount rate change is reflected as the actuarial gain or loss.