Pension Plan (Details) - The funded status of the plan - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plan (Details) - The funded status of the plan [Line Items]
Projected benefit obligation at beginning of year	$ 14,258,000	$ 12,965,000
Interest cost	387,000	501,000
Actuarial loss	1,396,000	1,565,000
Benefits paid	(896,000)	(773,000)
Projected benefit obligation at end of year	15,145,000	14,258,000
Fair value of plan assets at beginning of year	10,148,000	8,647,000
Actual return on plan assets	1,138,000	1,645,000
Company contributions	85,000	629,000
Benefits paid	(896,000)	(773,000)
Fair value of plan assets at end of year	10,475,000	10,148,000
Funded status (underfunded)	(4,670,000)	(4,110,000)
Net actuarial loss	$ 9,051,000	$ 8,296,000	$ 7,954,000
Discount rate:
Components of cost	3.20%	4.30%
Benefit obligations	2.41%	3.20%
Expected return on plan assets	8.00%	8.00%
Rate of compensation increase