Pension and Supplemental Executive Retirement Plans - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) installment	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) installment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	May 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to re-measure pension obligation						4.50%
Service cost	$ 0	$ 0	$ 0	$ 0
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate used to re-measure pension obligation	4.00%		4.00%
Employment period			3 years
Benefit obligation	$ 1,800		$ 1,800
Number of equal consecutive installments | installment	180		180
Consecutive installments, amount	$ 10		$ 10
Accrued liability	1,200		1,200		$ 1,200
Service cost	$ 10	$ 100	$ 20	$ 200