Supplemental Retirement Plan and Other Postretirement Benefit Obligations (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) officer	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) officer	Jun. 30, 2019 USD ($)
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Number of Active Executive Officers under Plan | officer	2		2
Number of Former Executive Officers under Plan | officer	1		1
Term of SERP benefits			20 years
Benefits Paid	$ 69	$ 69	$ 138
Net periodic benefit cost	20	25	40	$ 50
Remaining expected SERP accrual in current year	40		40
Supplemental Life Insurance Benefit
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost	$ 23	$ 49	$ 46	$ 99