Employee Benefit Plans (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of net periodic benefit costs:
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			7.00%
Pension Benefits
Components of net periodic benefit costs:
Interest cost	$ 60,000	$ 80,000	$ 194,000	$ 256,000
Expected return on plan assets	(143,000)	(187,000)	(492,000)	(577,000)
Amortization of net loss	21,000	35,000	84,000	101,000
Settlement charge	143,000	531,000	143,000	1,050,000
Net periodic benefit/cost	$ 81,000	459,000	$ (71,000)	830,000
Defined Benefit Plan, Plan Assets, Payment for Settlement		$ 531,000		$ 1,100,000
Other Postretirement Benefits Plan [Member] | Employees Hired before January 1, 2003
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Benefit based on highest average salary for number of consecutive years			5 years
Number of years for consecutive years calculation			10 years
Other Postretirement Benefits Plan [Member] | Employees Hired on or after January 1, 2003
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Percent of annual salary to calculate benefit			2.00%