Employee Benefit Plans - Supplemental Employee Retirement Plan (SERP) (Details) - Supplemental Employee Retirement Plan $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) officer
Defined Benefit Plan Disclosure [Line Items]
Number of active executive officers under plan	2
Number of former executive officers under plan	1
Term of SERP benefits	20 years
Accrual for benefit obligation for following year | $	$ 60